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Packaged terminal air conditioner installed in a residential apartment. A packaged terminal air conditioner (PTAC) is a type of self-contained heating and air conditioning system intended to be mounted through a wall. [1] The first practical semi-portable air conditioning unit invented by engineers at Chrysler Motors. It entered the market in ...
Air-conditioner sizes are often given as "tons" of cooling, where 1 ton of cooling equals 12,000 BTU/h (3.5 kW). 1 ton of cooling equals the amount of power that needs to be applied continuously over a 24-hour period to melt 1 ton of ice. The annual cost of electric energy consumed by an air conditioner may be calculated as follows:
The efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER), which is defined by the Air Conditioning, Heating and Refrigeration Institute in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment. [61]
Central, "all-air" air-conditioning systems (or package systems) with a combined outdoor condenser/evaporator unit are often installed in North American residences, offices, and public buildings, but are difficult to retrofit (install in a building that was not designed to receive it) because of the bulky air ducts required. [32] (Minisplit ...
An Egyptian qullah, set in drafts to cool interiors. Porous pottery and coarse cloth maximize the area for evaporation. An evaporative cooler (also known as evaporative air conditioner, swamp cooler, swamp box, desert cooler and wet air cooler) is a device that cools air through the evaporation of water.
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Qatar's first oil discovery was made in late 1930s with oil deposits found in Dukhan field. Since then, Qatar claims to have 1.5% of global oil reserves, while producing 2% of the global oil economy. [6] Oil storage tanks on Halul Island. In 2015, Qatar was ranked as the 17th top producer of crude oil worldwide at an approximate 1.532 million ...
Al Khor Industrial Area (Arabic: صناعية الخور; also known as Umm Qayn) is an industrial zone in Qatar located in the municipality of Al Khor. It is situated between Al Khor City, the municipal seat, and Al Thakhira. The government placed a moratorium on the area in 2005 but lifted it in 2017. [2]
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