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121-455: A windcatcher , wind tower , or wind scoop ( Persian : بادگیر ) is a traditional architectural element used to create cross ventilation and passive cooling in buildings. Windcatchers come in various designs, depending on whether local prevailing winds are unidirectional, bidirectional, or multidirectional, on how they change with altitude, on the daily temperature cycle, on humidity , and on how much dust needs to be removed. Despite

242-569: A salsabil (evaporative cooling unit) and a shuksheika ( roof lantern vent). Wide malqaf s are more often used in damper climates, where high-volume air flow is more important compared to evaporative cooling. In hotter climates, they are narrower, and air is cooled on its way in. They are more commonly used in Africa. Baudgir , on the other hand, are multisided (usually 4-sided), and they are typically tall towers (up to 34 meters tall) which can be closed in winter. They are more common in

363-655: A Dari dialect. In the 19th century, under the Qajar dynasty , the dialect that is spoken in Tehran rose to prominence. There was still substantial Arabic vocabulary, but many of these words have been integrated into Persian phonology and grammar. In addition, under the Qajar rule, numerous Russian , French , and English terms entered the Persian language, especially vocabulary related to technology. The first official attentions to

484-826: A common feature across many Middle Eastern countries, influenced by the spread of Islamic culture. In Iran, a windcatcher is called a bâdgir , bâd "wind" + gir "catcher" ( Persian : بادگیر ). The devices were used in Achaemenid architecture . They are used in the hot, dry areas of the Central Iranian Plateau, and in the hot, humid coastal regions. Central Iran shows large diurnal temperature variation with an arid climate . Most buildings are constructed from thick ceramic with high insulation values . Towns centered on desert oases tend to be packed very closely together with high walls and ceilings, maximizing shade at ground level. The heat of direct sunlight

605-422: A cone based air filter, some will opt to install a simple stainless steel mesh over the turbo to ensure no particles enter the engine via the turbo. An oil bath air cleaner consists of a sump containing a pool of oil, and an insert which is filled with fiber, mesh, foam, or another coarse filter media. The cleaner removes particles by adhering them to the oil-soaked filter media rather than traditional filtration,

726-418: A dictionary called Words of Scientific Association ( لغت انجمن علمی ), which was completed in the future and renamed Katouzian Dictionary ( فرهنگ کاتوزیان ). The first academy for the Persian language was founded on 20 May 1935, under the name Academy of Iran . It was established by the initiative of Reza Shah Pahlavi , and mainly by Hekmat e Shirazi and Mohammad Ali Foroughi , all prominent names in

847-487: A heavily shaded courtyard and onto a rear garden court (the garden side being shaded with a mashrabiya lattice). It is designed to capture a cross-draft. The breeze is at least partly driven by convection (since one court will generally be warmer than the other), and may also be driven by wind pressure and evaporative cooling, so the garden and courtyard are used as windcatchers. Buoyancy forces are used to cause night flushing. The diurnal temperature cycle means that

968-505: A language name is first attested in English in the mid-16th century. Farsi , which is the Persian word for the Persian language, has also been used widely in English in recent decades, more often to refer to Iran's standard Persian. However, the name Persian is still more widely used. The Academy of Persian Language and Literature has maintained that the endonym Farsi is to be avoided in foreign languages, and that Persian

1089-417: A literary language considerably different from the spoken Persian of the time. This became the basis of what is now known as "Contemporary Standard Persian". There are three standard varieties of modern Persian: All these three varieties are based on the classic Persian literature and its literary tradition. There are also several local dialects from Iran, Afghanistan and Tajikistan which slightly differ from

1210-446: A particular application, such filters present only trivial restriction to flow until the filter has become significantly clogged with dirt. Construction equipment engines also use this. The reason is that the paper is bent in zig-zag shape, and the total area of the paper is very large, in the range of 50 times of the air opening. Oil-wetted polyurethane foam elements are used in some aftermarket replacement automobile air filters. Foam

1331-536: A period of several centuries, Ottoman Turkish (which was highly Persianised itself) had developed toward a fully accepted language of literature, and which was even able to lexically satisfy the demands of a scientific presentation. However, the number of Persian and Arabic loanwords contained in those works increased at times up to 88%. In the Ottoman Empire, Persian was used at the royal court, for diplomacy, poetry, historiographical works, literary works, and

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1452-399: A slot in the firewall. A long, thin rubber seal plugged the slot when the filter was installed. The filter could be vacuumed and washed prior to installation. Clogged or dirty cabin air filters can significantly reduce airflow from the cabin vents, as well as introduce allergens into the cabin air stream. Since the cabin air temperature depends upon the flow rate of the air passing through

1573-599: A speaker of Persian. Persian is a member of the Western Iranian group of the Iranian languages , which make up a branch of the Indo-European languages in their Indo-Iranian subdivision . The Western Iranian languages themselves are divided into two subgroups: Southwestern Iranian languages, of which Persian is the most widely spoken, and Northwestern Iranian languages, of which Kurdish and Balochi are

1694-735: A very large aluminium windcatcher, which is much lighter than the equivalent masonry windcatcher would be. The size of the windcatcher allows it to work in any wind direction; the cross-sectional area perpendicular to the wind flow remains large. The Bluewater Shopping Centre in Kent uses windcatcher towers. The Queen's Building of De Montfort University in Leicester uses stack-effect towers to ventilate. Persian language Russia Persian ( / ˈ p ɜːr ʒ ən , - ʃ ən / PUR -zhən, -⁠shən ), also known by its endonym Farsi ( فارسی , Fārsī [fɒːɾˈsiː] ),

1815-615: Is a Western Iranian language belonging to the Iranian branch of the Indo-Iranian subdivision of the Indo-European languages . Persian is a pluricentric language predominantly spoken and used officially within Iran , Afghanistan , and Tajikistan in three mutually intelligible standard varieties , respectively Iranian Persian (officially known as Persian ), Dari Persian (officially known as Dari since 1964), and Tajiki Persian (officially known as Tajik since 1999). It

1936-664: Is a continuation of Middle Persian , an official language of the Sasanian Empire (224–651 CE), itself a continuation of Old Persian , which was used in the Achaemenid Empire (550–330 BCE). It originated in the region of Fars ( Persia ) in southwestern Iran. Its grammar is similar to that of many European languages. Throughout history, Persian was considered prestigious by various empires centered in West Asia , Central Asia , and South Asia . Old Persian

2057-628: Is a direct descendant of Middle and Old Persian. Gernot Windfuhr considers new Persian as an evolution of the Old Persian language and the Middle Persian language but also states that none of the known Middle Persian dialects is the direct predecessor of Modern Persian. Ludwig Paul states: "The language of the Shahnameh should be seen as one instance of continuous historical development from Middle to New Persian." The known history of

2178-454: Is also evaporatively cooled when some of the water in the qanat evaporates as the hot, dry surface air passes over it; the heat energy in the air is absorbed as energy of vaporization . The dry air is thus also humidified before entering the building. The cooled air is drawn up through the house and finally out the windcatcher, again by the Coandă effect. On the whole, the cool air flows through

2299-850: Is also spoken natively in the Tajik variety by a significant population within Uzbekistan , as well as within other regions with a Persianate history in the cultural sphere of Greater Iran . It is written officially within Iran and Afghanistan in the Persian alphabet , a derivative of the Arabic script , and within Tajikistan in the Tajik alphabet , a derivative of the Cyrillic script . Modern Persian

2420-675: Is attested in Old Persian cuneiform on inscriptions from between the 6th and 4th century BC. Middle Persian is attested in Aramaic -derived scripts ( Pahlavi and Manichaean ) on inscriptions and in Zoroastrian and Manichaean scriptures from between the third to the tenth centuries (see Middle Persian literature ). New Persian literature was first recorded in the ninth century, after the Muslim conquest of Persia , since then adopting

2541-590: Is built with only one downwind opening. This is the style most commonly seen in Meybod , 50 kilometers from Yazd: the windcatchers are short and have a single opening. Windcatchers in Iran may be quite elaborate, due to their use as status symbols. A small windcatcher is called a shish-khan in traditional Persian architecture. Shish-khans can still be seen on top of ab anbars in Qazvin and other northern cities in Iran. These seem to function more as ventilators than as

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2662-425: Is conventionally divided into three stages: Early New Persian remains largely intelligible to speakers of Contemporary Persian, as the morphology and, to a lesser extent, the lexicon of the language have remained relatively stable. New Persian texts written in the Arabic script first appear in the 9th-century. The language is a direct descendant of Middle Persian, the official, religious, and literary language of

2783-404: Is displacing. But in the day, the courtyard walls and awning shade it, while the air outside is heated by the sun. The cool masonry will also chill the nearby air. The courtyard air will become stably stratified , the hot air floating on top of the cold air with little mixing. The fact that the openings are at the top will trap the cool air below, though it cannot cause the temperature to drop below

2904-424: Is generally more important than buoyancy under most conditions in which the windcatcher is working effectively. Airflow speed is also important, especially for evaporative cooling (since it only works on dry air, and humidifies the air). It is possible for a windtower-ventilated building to have very high flow rates; 30 air changes per hour were measured in one experiment. Uniform, stable flow with no stagnant corners

3025-426: Is important. Turbulent flow should therefore be avoided; laminar flow is more effective at maintaining human comfort (for an extreme example, see Tesla valve ). Other elements are often used in combination with the windcatchers to cool and ventilate: courtyards , domes , walls, and fountains, for instance, as integral parts of an overall ventilation and heat-management strategy. If a windcatcher's open side faces

3146-404: Is minimized with small windows that face away from the sun. The windcatcher's effectiveness had led to its routine use as a refrigerating device in Iran. Many traditional water reservoirs ( ab anbars ), which are capable of storing water at near freezing temperatures during summer months, are built with windcatchers. The evaporative cooling effect is strongest in the driest climates, such as on

3267-460: Is not actually attested until 600 years later when it appears in the Sassanid era (224–651 AD) inscriptions, so any form of the language before this date cannot be described with any degree of certainty. Moreover, as a literary language, Middle Persian is not attested until much later, in the 6th or 7th century. From the 8th century onward, Middle Persian gradually began yielding to New Persian, with

3388-475: Is one of Afghanistan's two official languages, together with Pashto . The term Dari , meaning "of the court", originally referred to the variety of Persian used in the court of the Sasanian Empire in capital Ctesiphon , which was spread to the northeast of the empire and gradually replaced the former Iranian dialects of Parthia ( Parthian ). Tajik Persian ( форси́и тоҷикӣ́ , forsi-i tojikī ),

3509-585: Is one of the earliest attested Indo-European languages. According to certain historical assumptions about the early history and origin of ancient Persians in Southwestern Iran (where Achaemenids hailed from), Old Persian was originally spoken by a tribe called Parsuwash , who arrived in the Iranian Plateau early in the 1st millennium BCE and finally migrated down into the area of present-day Fārs province. Their language, Old Persian, became

3630-472: Is positioned above or beside the carburetor or throttle body, usually in a metal or plastic container which may incorporate ducting to provide cool and/or warm inlet air, and secured with a metal or plastic lid. The overall unit (filter and housing together) is called the air cleaner . Pleated paper filter elements are the nearly exclusive choice for automobile engine air cleaners, because they are efficient, easy to service, and cost-effective. The "paper" term

3751-410: Is somewhat misleading, as the filter media are considerably different from papers used for writing or packaging, etc. There is a persistent belief among tuners , fomented by advertising for aftermarket non-paper replacement filters, that paper filters flow poorly and thus restrict engine performance. In fact, as long as a pleated-paper filter is sized appropriately for the airflow volumes encountered in

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3872-495: Is the appropriate designation of the language in English, as it has the longer tradition in western languages and better expresses the role of the language as a mark of cultural and national continuity. Iranian historian and linguist Ehsan Yarshater , founder of the Encyclopædia Iranica and Columbia University 's Center for Iranian Studies, mentions the same concern in an academic journal on Iranology , rejecting

3993-685: Is thus intensely disputed; Egypt, Iran, and the United Arab Emirates all claim it. Windcatchers vary dramatically in shape, including height, cross-sectional area, and internal sub-divisions and filters. Windcatching has gained some ground in Western architecture, and there are several commercial products using the name windcatcher . Some modern windcatchers use sensor-controlled moving parts or even solar-powered fans to make semi- passive ventilation and semi- passive cooling systems. Windscoops have long been used on ships, for example in

4114-542: Is typically a pleated-paper filter that is placed in the outside-air intake for the vehicle's passenger compartment. Some of these filters are rectangular and similar in shape to the engine air filter. Others are uniquely shaped to fit the available space of particular vehicles' outside-air intakes. The first automaker to include a disposable filter to keep the ventilation system clean was the Nash Motors " Weather Eye ", introduced in 1940. A reusable heater core filter

4235-410: Is usually not the main effect driving windcatcher air circulation during the day. In a windless environment, a windcatcher can still function using the stack effect . The hot air, which is less dense, tends to travel upwards and escape out the top of the house via the windtower. Heating of the windtower itself can heat the air inside (making it a solar chimney ), so that it rises and pulls air out of

4356-491: The Encyclopædia Iranica notes that the Iranian, Afghan, and Tajiki varieties comprise distinct branches of the Persian language, and within each branch a wide variety of local dialects exist. The following are some languages closely related to Persian, or in some cases are considered dialects: More distantly related branches of the Iranian language family include Kurdish and Balochi . The Glottolog database proposes

4477-506: The Kalila wa Dimna . The language spread geographically from the 11th century on and was the medium through which, among others, Central Asian Turks became familiar with Islam and urban culture. New Persian was widely used as a trans-regional lingua franca , a task aided due to its relatively simple morphology, and this situation persisted until at least the 19th century. In the late Middle Ages, new Islamic literary languages were created on

4598-668: The British colonization , Persian was widely used as a second language in the Indian subcontinent . It took prominence as the language of culture and education in several Muslim courts on the subcontinent and became the sole "official language" under the Mughal emperors . The Bengal Sultanate witnessed an influx of Persian scholars, lawyers, teachers, and clerics. Thousands of Persian books and manuscripts were published in Bengal. The period of

4719-538: The Persian Gulf region and in areas with dust storms . Taller windcatchers also have a stronger stack effect . Night-flushing cools the house by increasing ventilation at night, when the outdoor air is cooler; windtowers can assist night flushing. A windcatcher can also cool air by drawing it over cool objects. In arid climates , the daily temperature swings are often extreme, with desert temperatures often dipping below freezing at night. The thermal inertia of

4840-674: The Sultanate of Rum , Turkmen beyliks of Anatolia , Delhi Sultanate , the Shirvanshahs , Safavids , Afsharids , Zands , Qajars , Khanate of Bukhara , Khanate of Kokand , Emirate of Bukhara , Khanate of Khiva , Ottomans , and also many Mughal successors such as the Nizam of Hyderabad . Persian was the only non-European language known and used by Marco Polo at the Court of Kublai Khan and in his journeys through China. A branch of

4961-713: The Turkic , Armenian , Georgian , & Indo-Aryan languages . It also exerted some influence on Arabic, while borrowing a lot of vocabulary from it in the Middle Ages. Some of the world's most famous pieces of literature from the Middle Ages, such as the Shahnameh by Ferdowsi , the works of Rumi , the Rubáiyát of Omar Khayyám , the Panj Ganj of Nizami Ganjavi , The Divān of Hafez , The Conference of

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5082-553: The United States Department of Energy (DOE). Varying standards define what qualifies as a HEPA filter. The two most common standards require that an air filter must remove (from the air that passes through) 99.95% (European Standard) or 99.97% (ASME standard) of particles that have a size greater than or equal to 0.3  μm . The cabin air filter, also known in the United Kingdom as a pollen filter,

5203-611: The aerodynamics and fluid dynamics of the air-compressor part of the gas turbines. High efficiency particulate arrester (HEPA), originally called high-efficiency particulate absorber but also sometimes called high-efficiency particulate arresting or high-efficiency particulate arrestance, is a type of air filter. Filters meeting the HEPA standard have many applications, including use in clean rooms for IC fabrication, medical facilities, automobiles, aircraft and homes. The filter must satisfy certain standards of efficiency such as those set by

5324-632: The electrical grid power fails (a particular concern in places where grid power is unreliable or expensive). Windcatchers rely on local weather and microclimate conditions, and not all techniques will work everywhere; local factors must be taken into account in design. Windcatchers of varying designs are widely used in North Africa, West Asia , and India. A simple, widespread idea, there is evidence that windcatchers have been in use for many millennia, and no clear evidence that they were not used into prehistory . The "place of invention" of windcatchers

5445-431: The evaporative cooling effect may be used by placing water at the air intake, such that the draft draws air over water and then into the house. For this reason, it is sometimes said that the fountain, in the architecture of hot, arid climates, is like the fireplace in the architecture of cold climates. Windcatchers are used for evaporative cooling in combination with a qanat , or underground canal (which also makes use of

5566-491: The ezāfe construction, expressed through ī (modern e/ye ), to indicate some of the relations between words that have been lost with the simplification of the earlier grammatical system. Although the "middle period" of the Iranian languages formally begins with the fall of the Achaemenid Empire, the transition from Old to Middle Persian had probably already begun before the 4th century BC. However, Middle Persian

5687-434: The heater core , the evaporator , or both, clogged filters can greatly reduce the effectiveness and performance of the vehicle's air conditioning and heating systems. Some cabin air filters perform poorly, and some cabin air filter manufacturers do not print a minimum efficiency reporting value (MERV) filter rating on their cabin air filters. The combustion air filter prevents abrasive particulate matter from entering

5808-597: The " Persianized " Turko-Mongol dynasties during the 12th to 15th centuries, and under restored Persian rule during the 16th to 19th centuries. Persian during this time served as lingua franca of Greater Persia and of much of the Indian subcontinent . It was also the official and cultural language of many Islamic dynasties, including the Samanids, Buyids , Tahirids , Ziyarids , the Mughal Empire , Timurids , Ghaznavids , Karakhanids , Seljuqs , Khwarazmians ,

5929-681: The Birds by Attar of Nishapur , and the miscellanea of Gulistan and Bustan by Saadi Shirazi , are written in Persian. Some of the prominent modern Persian poets were Nima Yooshij , Ahmad Shamlou , Simin Behbahani , Sohrab Sepehri , Rahi Mo'ayyeri , Mehdi Akhavan-Sales , and Forugh Farrokhzad . There are approximately 130 million Persian speakers worldwide, including Persians , Lurs , Tajiks , Hazaras , Iranian Azeris , Iranian Kurds , Balochs , Tats , Afghan Pashtuns , and Aimaqs . The term Persophone might also be used to refer to

6050-414: The Iranian plateau, leading to the ubiquitous use of windcatchers in drier areas such as Yazd , Kerman , Kashan , Sirjan , Nain , and Bam . Windcatchers tend to have one, four, or eight openings. In the city of Yazd, all windcatchers are four- or eight-sided. The construction of a windcatcher depends on the direction of airflow at that specific location: if the wind tends to blow from only one side, it

6171-565: The Middle Ages, and is because of the lack of the phoneme /p/ in Standard Arabic. The standard Persian of Iran has been called, apart from Persian and Farsi , by names such as Iranian Persian and Western Persian , exclusively. Officially, the official language of Iran is designated simply as Persian ( فارسی , fārsi ). The standard Persian of Afghanistan has been officially named Dari ( دری , dari ) since 1958. Also referred to as Afghan Persian in English, it

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6292-543: The Ottoman Empire all spoke Persian, such as Sultan Selim I , despite being Safavid Iran's archrival and a staunch opposer of Shia Islam . It was a major literary language in the empire. Some of the noted earlier Persian works during the Ottoman rule are Idris Bidlisi 's Hasht Bihisht , which began in 1502 and covered the reign of the first eight Ottoman rulers, and the Salim-Namah , a glorification of Selim I. After

6413-530: The Persian language can be divided into the following three distinct periods: As a written language , Old Persian is attested in royal Achaemenid inscriptions. The oldest known text written in Old Persian is from the Behistun Inscription , dating to the time of King Darius I (reigned 522–486 BC). Examples of Old Persian have been found in what is now Iran , Romania ( Gherla ), Armenia , Bahrain , Iraq , Turkey, and Egypt . Old Persian

6534-425: The Persian language, a language historically called Dari, emerged in present-day Afghanistan. The first significant Persian poet was Rudaki . He flourished in the 10th century, when the Samanids were at the height of their power. His reputation as a court poet and as an accomplished musician and singer has survived, although little of his poetry has been preserved. Among his lost works are versified fables collected in

6655-401: The Persian model: Ottoman Turkish , Chagatai Turkic , Dobhashi Bengali , and Urdu, which are regarded as "structural daughter languages" of Persian. "Classical Persian" loosely refers to the standardized language of medieval Persia used in literature and poetry . This is the language of the 10th to 12th centuries, which continued to be used as literary language and lingua franca under

6776-886: The Perso-Arabic script. Persian was the first language to break through the monopoly of Arabic on writing in the Muslim world , with Persian poetry becoming a tradition in many eastern courts. It was used officially as a language of bureaucracy even by non-native speakers, such as the Ottomans in Anatolia , the Mughals in South Asia, and the Pashtuns in Afghanistan. It influenced languages spoken in neighboring regions and beyond, including other Iranian languages,

6897-484: The Sasanian Empire (224–651). However, it is not descended from the literary form of Middle Persian (known as pārsīk , commonly called Pahlavi), which was spoken by the people of Fars and used in Zoroastrian religious writings. Instead, it is descended from the dialect spoken by the court of the Sasanian capital Ctesiphon and the northeastern Iranian region of Khorasan , known as Dari. The region, which comprised

7018-588: The Sassanids (who were Persians, i.e. from the southwest) from the preceding Arsacids (who were Parthians, i.e. from the northeast). While Ibn al-Muqaffa' (eighth century) still distinguished between Pahlavi (i.e. Parthian) and Persian (in Arabic text: al-Farisiyah) (i.e. Middle Persian), this distinction is not evident in Arab commentaries written after that date. "New Persian" (also referred to as Modern Persian)

7139-462: The Seljuks, the Sultanate of Rum , took Persian language, art, and letters to Anatolia. They adopted the Persian language as the official language of the empire. The Ottomans , who can roughly be seen as their eventual successors, inherited this tradition. Persian was the official court language of the empire, and for some time, the official language of the empire. The educated and noble class of

7260-409: The air with evaporative cooling . The heat in the air goes into evaporating some of the water, and will not be released until the water re-condenses. This is a very effective way of cooling dry air. Simply moving the air also has a cooling effect. Humans cool themselves using evaporative cooling when they sweat . A draft disrupts the boundary layer of body-warmed and water-saturated air clinging to

7381-498: The area of Lake Urmia in the records of Shalmaneser III . The exact identity of the Parsuwash is not known for certain, but from a linguistic viewpoint the word matches Old Persian pārsa itself coming directly from the older word * pārćwa . Also, as Old Persian contains many words from another extinct Iranian language, Median , according to P. O. Skjærvø it is probable that Old Persian had already been spoken before

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7502-460: The bottom of the base bowl. Lighter and smaller particles stick to the filtration media in the insert, which is wetted by oil droplets aspirated there into by normal airflow. The constant aspiration of oil onto the filter media slowly carries most of the finer trapped particles downward and the oil drips back into the reservoir where the particles accumulate. Oil bath air cleaners were very widely used in automotive and small engine applications until

7623-413: The bottom of the windcatcher as the air slows (see diagram below), and more can be filtered out by suitable plantings or insect mesh. Physical filters generally reduce throughflow, unless the flow is very gusty. It may also be possible to fully or partially close the windcatcher off. The short, wide right-triangle-prism malqaf are usually bidirectional, set in symmetrical pairs, and are often used with

7744-426: The building, decreasing the structure's overall temperature. A salasabil is a type of fountain with a thin sheet of flowing water, shaped to maximize surface area and thus evaporative cooling. Windcatchers are often used with salasabils may be used to maximize the flow of unsaturated air over the water surface and carry the cooled air to where it is needed in the building. Wetted matting can also be hung inside

7865-457: The code fas for the dialects spoken across Iran and Afghanistan. This consists of the individual languages Dari ( prs ) and Iranian Persian ( pes ). It uses tgk for Tajik, separately. In general, the Iranian languages are known from three periods: namely Old, Middle, and New (Modern). These correspond to three historical eras of Iranian history ; Old era being sometime around the Achaemenid Empire (i.e., 400–300 BC), Middle era being

7986-512: The collapse of the Sassanid state, Parsik came to be applied exclusively to (either Middle or New) Persian that was written in the Arabic script . From about the 9th century onward, as Middle Persian was on the threshold of becoming New Persian, the older form of the language came to be erroneously called Pahlavi , which was actually but one of the writing systems used to render both Middle Persian as well as various other Middle Iranian languages. That writing system had previously been adopted by

8107-444: The early 20th century (about 1900 to 1930), water bath air cleaners were used in some applications (cars, trucks, tractors, and portable and stationary engines). They worked on roughly the same principles as oil bath air cleaners . For example, the original Fordson tractor had a water bath air cleaner. By the 1940s, oil bath designs had displaced water bath designs because of better filtering performance. Bulk solids handling involves

8228-484: The engine's cylinders, where it would cause mechanical wear and oil contamination. Most fuel injected vehicles use a pleated paper filter element in the form of a flat panel. This filter is usually placed inside a plastic box connected to the throttle body with duct work. Older vehicles that use carburetors or throttle body fuel injection typically use a cylindrical air filter, usually between 100 millimetres (4 in) and 400 millimetres (16 in) in diameter. This

8349-652: The extent of its influence on certain languages of the Indian subcontinent. Words borrowed from Persian are still quite commonly used in certain Indo-Aryan languages, especially Hindi - Urdu (also historically known as Hindustani ), Punjabi , Kashmiri , and Sindhi . There is also a small population of Zoroastrian Iranis in India, who migrated in the 19th century to escape religious execution in Qajar Iran and speak

8470-678: The following phylogenetic classification: Air filter Some buildings, as well as aircraft and other human-made environments (e.g., satellites , and Space Shuttles ) use foam, pleated paper, or spun fiberglass filter elements. Another method, air ionizers , use fibers or elements with a static electric charge, which attract dust particles. The air intakes of internal combustion engines and air compressors tend to use either paper , foam , or cotton filters. Oil bath filters have fallen out of favour aside from niche uses. The technology of air intake filters of gas turbines has improved significantly in recent years, due to improvements in

8591-440: The form of a dorade box . Windcatchers have also been used experimentally to cool outdoor areas in cities, with mixed results; traditional methods include narrow, walled spaces, parks and winding streets, which act as cold-air reservoirs, and takhtabush -like arrangements (see sections on night flushing and convection, below). The construction of a windcatcher depends on the prevailing wind direction at that specific location: if

8712-577: The formation of many modern languages in West Asia, Europe, Central Asia , and South Asia . Following the Turko-Persian Ghaznavid conquest of South Asia , Persian was firstly introduced in the region by Turkic Central Asians. The basis in general for the introduction of Persian language into the subcontinent was set, from its earliest days, by various Persianized Central Asian Turkic and Afghan dynasties. For five centuries prior to

8833-476: The formation of the Achaemenid Empire and was spoken during most of the first half of the first millennium BCE. Xenophon , a Greek general serving in some of the Persian expeditions, describes many aspects of Armenian village life and hospitality in around 401 BCE, which is when Old Persian was still spoken and extensively used. He relates that the Armenian people spoke a language that to his ear sounded like

8954-487: The house, and leaves from the other side, creating a through-draft; the rate of airflow itself can provide a cooling effect. Windcatchers have been employed in this manner for thousands of years. The windtower essentially creates a pressure gradient to draw air through the building. Windtowers topped with horizontal airfoils have been built to enhance these pressure gradients. The shape of the traditional shuksheika roof also creates suction as wind blows over it. Buoyancy

9075-466: The language of the Persians. Related to Old Persian, but from a different branch of the Iranian language family, was Avestan , the language of the Zoroastrian liturgical texts. The complex grammatical conjugation and declension of Old Persian yielded to the structure of Middle Persian in which the dual number disappeared, leaving only singular and plural, as did gender. Middle Persian developed

9196-422: The latter property making foam filters a popular choice in off-road rallying and other motorsport applications where high levels of dust will be encountered. Due to the way dust is captured on foam filters, large amounts may be trapped without measurable change in airflow restriction. Oiled cotton gauze is employed in a growing number of aftermarket automotive air filters marketed as high-performance items. In

9317-480: The middle of the day even without windcatchers. Ice houses are traditionally used to store water frozen overnight in desert areas, or over winter in temperate areas. They may use windcatchers to circulate air into an underground or semi-underground chamber, evaporatively cooling the ice so that it melts only slowly and stays fairly dry (see lede image ). At night, the windcatchers may even bring sub-freezing night air underground, helping to freeze ice. In dry climates,

9438-432: The middle-period form only continuing in the texts of Zoroastrianism . Middle Persian is considered to be a later form of the same dialect as Old Persian. The native name of Middle Persian was Parsig or Parsik , after the name of the ethnic group of the southwest, that is, "of Pars ", Old Persian Parsa , New Persian Fars . This is the origin of the name Farsi as it is today used to signify New Persian. Following

9559-536: The most widely spoken. The term Persian is an English derivation of Latin Persiānus , the adjectival form of Persia , itself deriving from Greek Persís ( Περσίς ), a Hellenized form of Old Persian Pārsa ( 𐎱𐎠𐎼𐎿 ), which means " Persia " (a region in southwestern Iran, corresponding to modern-day Fars ). According to the Oxford English Dictionary , the term Persian as

9680-570: The name, windcatchers can also function without wind . Neglected by modern architects in the latter half of the 20th century, the early 21st century saw them used again to increase ventilation and cut power demand for air-conditioning . Generally, the cost of construction for a windcatcher-ventilated building is less than that of a similar building with conventional heating, ventilation, and air conditioning (HVAC) systems. The maintenance costs are also lower. Unlike powered air-conditioning and fans, windcatchers are silent and continue to function when

9801-466: The nationalist movement of the time. The academy was a key institution in the struggle to re-build Iran as a nation-state after the collapse of the Qajar dynasty. During the 1930s and 1940s, the academy led massive campaigns to replace the many Arabic , Russian , French , and Greek loanwords whose widespread use in Persian during the centuries preceding the foundation of the Pahlavi dynasty had created

9922-499: The necessity of protecting the Persian language against foreign words, and to the standardization of Persian orthography , were under the reign of Naser ed Din Shah of the Qajar dynasty in 1871. After Naser ed Din Shah, Mozaffar ed Din Shah ordered the establishment of the first Persian association in 1903. This association officially declared that it used Persian and Arabic as acceptable sources for coining words. The ultimate goal

10043-414: The next period most officially around the Sasanian Empire , and New era being the period afterward down to present day. According to available documents, the Persian language is "the only Iranian language" for which close philological relationships between all of its three stages are established and so that Old, Middle, and New Persian represent one and the same language of Persian; that is, New Persian

10164-403: The night air is colder than the daytime air; in arid climates, much colder. This creates appreciable buoyancy forces. Buildings may be designed to spontaneously increase ventilation at night. Courtyards in hot climates fill with cold air at night. This cold air then flows from the courtyard into adjacent rooms. The cold night air will flow in easily, as it is more dense than the rising warm air it

10285-483: The nightly minimum temperature. This mechanism also works in windtowers. A windcatcher can also cool air by bringing it into contact with cool thermal masses . These are often found underground. Below approximately 6m of depth, soil and groundwater is always at about the annual mean-average temperature (MATT) (it is this depth which is used for many ground-source heat pumps , often loosely referred to as "geothermal heat pumps" by laypeople). The thermal inertia of

10406-732: The northern part of Greece). Vardar Yenicesi differed from other localities in the Balkans insofar as that it was a town where Persian was also widely spoken. However, the Persian of Vardar Yenicesi and throughout the rest of the Ottoman-held Balkans was different from formal Persian both in accent and vocabulary. The difference was apparent to such a degree that the Ottomans referred to it as "Rumelian Persian" ( Rumili Farsisi ). As learned people such as students, scholars and literati often frequented Vardar Yenicesi, it soon became

10527-542: The official language of the Achaemenid kings. Assyrian records, which in fact appear to provide the earliest evidence for ancient Iranian (Persian and Median) presence on the Iranian Plateau, give a good chronology but only an approximate geographical indication of what seem to be ancient Persians. In these records of the 9th century BCE, Parsuwash (along with Matai , presumably Medians) are first mentioned in

10648-402: The openings in the filter media are much larger than the particles that are to be filtered. When the cleaner is assembled, the media-containing body of the insert sits a short distance above the surface of the oil pool. The rim of the insert overlaps the rim of the sump. This arrangement forms a labyrinthine path through which the air must travel in a series of U-turns: up through the gap between

10769-408: The outdoor temperature. A window windcatcher can reduce the total energy use of a building by 23.3%. In Egypt windcatchers are known as malqaf , pl. malaaqef . They are generally shaped as right triangular prisms with the vertical side left open and facing directly up or down wind (one of each per building). They work best if oriented within 10 degrees of wind direction; larger angles allow

10890-560: The past, cotton gauze saw limited use in original-equipment automotive air filters. However, since the introduction of the Abarth SS versions, the Fiat subsidiary supplies cotton gauze air filters as OE filters. Stainless steel mesh is another example of medium which allow more air to pass through. Stainless steel mesh comes with different mesh counts, offering different filtration standards. In an extreme modified engine lacking in space for

11011-638: The present territories of northwestern Afghanistan as well as parts of Central Asia, played a leading role in the rise of New Persian. Khorasan, which was the homeland of the Parthians, was Persianized under the Sasanians. Dari Persian thus supplanted Parthian language , which by the end of the Sasanian era had fallen out of use. New Persian has incorporated many foreign words, including from eastern northern and northern Iranian languages such as Sogdian and especially Parthian. The transition to New Persian

11132-406: The prevailing wind, it can "catch" it, and bring it down into the heart of the building. Suction from the lee side of a windtower is also an important driving force, usually somewhat more constant and less gusty than the pressure on the upwind side (see Venturi effect and Bernoulli's principle ). Routing the wind through the building cools the people in the building interior. The air flows through

11253-492: The process, especially at the reception of pneumatic conveying lines where the quantity of air is important and the load in fine particle quite important. Filters can also be placed at any point of air exchange in the process to avoid that pollutants enter the process, which is particularly true in pharmaceuticals and food industries. The physical phenomena involved in catching particles with a filter are mainly inertial and diffusional Under European normalization standards EN 779,

11374-415: The qanat tunnel is cooled by coming into contact with the water flow and the surrounding earth . The soil below ground level stays cool by virtue of being several meters below the surface. The insulation and heat capacity of the overlying earth maintains the same stable temperature day and night, and as nights in arid climates are quite cold, often below freezing, that stable temperature is quite cool. The air

11495-588: The region during the following centuries. Persian continued to act as a courtly language for various empires in Punjab through the early 19th century serving finally as the official state language of the Sikh Empire , preceding British conquest and the decline of Persian in South Asia. Beginning in 1843, though, English and Hindustani gradually replaced Persian in importance on the subcontinent. Evidence of Persian's historical influence there can be seen in

11616-602: The reign of Sultan Ghiyathuddin Azam Shah is described as the "golden age of Persian literature in Bengal". Its stature was illustrated by the Sultan's own correspondence and collaboration with the Persian poet Hafez ; a poem which can be found in the Divan of Hafez today. A Bengali dialect emerged among the common Bengali Muslim folk, based on a Persian model and known as Dobhashi ; meaning mixed language . Dobhashi Bengali

11737-403: The rims of the insert and the sump, down through the gap between the outer wall of the insert and the inner wall of the sump, and up through the filter media in the body of the insert. This U-turn takes the air at high velocity across the surface of the oil pool. Larger and heavier dust and dirt particles in the air cannot make the turn due to their inertia , so they fall into the oil and settle to

11858-446: The sharp angles make the flow less laminar , encouraging flow separation ; suitable shaping increases suction. Taller windcatchers catch higher winds. Higher winds blow stronger and cooler (and in a different direction ). Higher air is also usually less dusty. If the wind is dusty or polluted, or there are insect-borne illnesses such as malaria and dengue fever , then air filtering may be necessary. Some dust can be dumped at

11979-613: The site of a flourishing Persianate linguistic and literary culture. The 16th-century Ottoman Aşık Çelebi (died 1572), who hailed from Prizren in modern-day Kosovo , was galvanized by the abundant Persian-speaking and Persian-writing communities of Vardar Yenicesi, and he referred to the city as a "hotbed of Persian". Many Ottoman Persianists who established a career in the Ottoman capital of Constantinople (modern-day Istanbul ) pursued early Persian training in Saraybosna, amongst them Ahmed Sudi . The Persian language influenced

12100-443: The skin, so a human will feel cooler in moving air than in stagnant air of the same temperature. The windcatcher can function in two ways: directing airflow using the pressure of wind blowing into the windcatcher, or directing airflow using buoyancy forces from temperature gradients ( stack effect ). The relative importance of these two forces has been debated. The importance of windpressure increases with increasing wind speed, and

12221-421: The soil evens out the daily and even annual temperature swings. Even the thermal inertia of thick masonry walls will keep a building warmer at night and cooler during the day. Windcatchers can thus cool by drawing air over night- or winter-cooled materials, which act as heat reservoirs . Windcatchers that cool by drawing air over water use the water as a heat reservoir, but if the air is dry, they are also cooling

12342-757: The soil evens out the daily and even annual temperature swings. In arid climates , the daily temperature swings are often extreme, with desert temperatures often dipping below freezing at night. Even the thermal inertia of thick masonry walls will keep a building warmer at night and cooler during the day; in hot-arid climates, thick walls with high thermal mass ( adobe , stone, brick ) are common (though thinner walls with high resistance against heat transmission are more modernly sometimes used). Windcatchers can thus cool by drawing air over night- or winter-cooled materials, which act as heat reservoirs . Windcatchers are also often used to ventilate lower-level indoor spaces (e.g. shabestans ), which maintain frigid temperatures in

12463-573: The standard Persian of Tajikistan, has been officially designated as Tajik ( тоҷикӣ , tojikī ) since the time of the Soviet Union . It is the name given to the varieties of Persian spoken in Central Asia in general. The international language-encoding standard ISO 639-1 uses the code fa for the Persian language, as its coding system is mostly based on the native-language designations. The more detailed standard ISO 639-3 uses

12584-717: The standard Persian. The Hazaragi dialect (in Central Afghanistan and Pakistan), Herati (in Western Afghanistan), Darwazi (in Afghanistan and Tajikistan), Basseri (in Southern Iran), and the Tehrani accent (in Iran, the basis of standard Iranian Persian) are examples of these dialects. Persian-speaking peoples of Iran, Afghanistan, and Tajikistan can understand one another with a relatively high degree of mutual intelligibility . Nevertheless,

12705-457: The subterranean heat reservoir described above). In this method, the open side of the tower faces away from the direction of the prevailing wind (the tower's orientation may be adjusted by directional ports at the top). When only the leeward side is left open, air is drawn upwards using the Coandă effect . This pulls air into an intake on the other side of the building. The hot air brought down into

12826-560: The temperature regulators seen in the central deserts of Iran. Council House 2 in Melbourne , Australia, has 3-story-tall "shower towers", made of cloth kept wet by a showerhead trickling at the top of each one. Evaporative cooling chills the air, which then descends into the building. The Saint-Étienne Métropole 's Zénith is a multi-purpose hall built in Auvergne-Rhône-Alpes (inland southern France). It incorporates

12947-415: The top of the house, creating a draft. This effect can be enhanced with a heat source at the bottom of the windtower ( such as humans, ~80 Watts each ), but this heats the house and makes it less comfortable. A more practical technique is to cool the air as it flows down and in, using heat reservoirs and/or evaporative cooling. A takhtabush is a space similar to the ancient Roman tablinum, opening both onto

13068-431: The transport of solids (mechanical transport, pneumatic transport) which may be in a powder form. Many industries are handling bulk solids (mining industries, chemical industries, food industries) which requires the treatment of air streams escaping the process so that fine particles are not emitted, for regulatory reasons or economical reasons (loss of materials). As a consequence, air filters are positioned at many places in

13189-485: The use of Farsi in foreign languages. Etymologically, the Persian term Farsi derives from its earlier form Pārsi ( Pārsik in Middle Persian ), which in turn comes from the same root as the English term Persian . In the same process, the Middle Persian toponym Pārs ("Persia") evolved into the modern name Fars. The phonemic shift from /p/ to /f/ is due to the influence of Arabic in

13310-437: The water is hard) or cold-water cooling coils (like hydronic underfloor heating in reverse). Windcatchers can be used for mitigation of climate change as they can "reduce the building's energy consumption and carbon footprint " and for adaptation to climate change because they facilitate cooling in a warmer climate. Windcatchers can reduce temperature inside the house by 8 to 12 °C (14 to 22 °F) in comparison to

13431-630: The widespread industry adoption of the paper filter in the early 1960s. Such cleaners are still used in off-road equipment where very high levels of dust are encountered, for oil bath air cleaners can sequester a great deal of dirt relative to their overall size without loss of filtration efficiency or airflow. However, the liquid oil makes cleaning and servicing such air cleaners messy and inconvenient, they must be relatively large to avoid excessive restriction at high airflow rates, and they tend to increase exhaust emissions of unburned hydrocarbons due to oil aspiration when used on spark-ignition engines. In

13552-415: The wind hits the opening square-on, it will go in, but if it hits it at a sufficiently oblique angle, it will tend to slip around the tower, instead. Windcatchers in areas with stronger winds will have smaller total cross-sections, and areas with very hot wind may have many smaller shafts in order to cool the incoming air. Windtowers with square horizontal cross-sections are more efficient than round ones, as

13673-440: The wind tends to blow from only one side, it may have only one opening, and no internal partitions. In areas with more variable wind directions, there may also be radial internal walls, which divide the windtower into vertical sections. These sections are like parallel chimneys , but with openings to the side, pointing in multiple directions. More sections reduce the flow rate, but increase the efficiency at suboptimal wind angles. If

13794-486: The wind to escape. Windcatchers were used in traditional ancient Egyptian architecture , and only started to fall out of use in the mid-20th century. Their use is now being re-examined, as air conditioning accounts for 60% of Egypt's peak electrical power demand (and thus the need for 60% of its generating capacity ). Windcatchers in Egypt are often used in conjunction with other passive cooling elements. Windcatchers are

13915-414: The windcatcher to cool incoming air. This can reduce flow, especially in weak winds. However, it can also produce a downdraft of cool air in windless conditions. The evaporative cooling within a windtower causes the air in the tower to sink, driving circulation. This is called passive downdraught evaporative cooling (PDEC). It may also be generated using spray nozzles (which have a tendency to get blocked if

14036-597: Was already complete by the era of the three princely dynasties of Iranian origin, the Tahirid dynasty (820–872), Saffarid dynasty (860–903), and Samanid Empire (874–999). Abbas of Merv is mentioned as being the earliest minstrel to chant verse in the New Persian tongue and after him the poems of Hanzala Badghisi were among the most famous between the Persian-speakers of the time. The first poems of

14157-414: Was available as an optional accessory on Studebaker models beginning in 1959, including Studebaker Lark automobiles (1959-1966), Studebaker Gran Turismo Hawk automobiles (1962-1964) and Studebaker Champ trucks (1960-1964). The filter was an aluminum frame containing an aluminum mesh and was located directly above the heater core. The filter was removed and installed from the engine compartment through

14278-469: Was in the past widely used in air cleaners on small engines on lawnmowers and other power equipment, but automotive-type paper filter elements have largely supplanted oil-wetted foam in these applications. Foam filters are still commonly used on air compressors for air tools up to 5 horsepower (3.7 kW). Depending on the grade and thickness of foam employed, an oil-wetted foam filter element can offer minimal airflow restriction or very high dirt capacity,

14399-597: Was patronised and given official status under the Sultans of Bengal , and was a popular literary form used by Bengalis during the pre-colonial period, irrespective of their religion. Following the defeat of the Hindu Shahi dynasty, classical Persian was established as a courtly language in the region during the late 10th century under Ghaznavid rule over the northwestern frontier of the subcontinent . Employed by Punjabis in literature, Persian achieved prominence in

14520-613: Was taught in state schools, and was also offered as an elective course or recommended for study in some madrasas . Persian learning was also widespread in the Ottoman-held Balkans ( Rumelia ), with a range of cities being famed for their long-standing traditions in the study of Persian and its classics, amongst them Saraybosna (modern Sarajevo , Bosnia and Herzegovina), Mostar (also in Bosnia and Herzegovina), and Vardar Yenicesi (or Yenice-i Vardar, now Giannitsa , in

14641-492: Was to prevent books from being printed with wrong use of words. According to the executive guarantee of this association, the government was responsible for wrongfully printed books. Words coined by this association, such as rāh-āhan ( راه‌آهن ) for "railway", were printed in Soltani Newspaper ; but the association was eventually closed due to inattention. A scientific association was founded in 1911, resulting in

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