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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 ...
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]
The use of diaphragm mud pumps is less common, but with the advantage of a simpler design and usually lower overall costs. [3] The disadvantage is that mechanical parts come into contact with the sludge, which is not the case for the more common vacuum pumps. The truck can be configured to be a direct belt drive, or a hydraulic drive system.
The tugs and tractors at an airport have several purposes and represent the essential part of ground support services. They are used to move all equipment that can not move itself. This includes bag carts, mobile air conditioning units, air starters, and lavatory carts.
Bellows, hydraulic-powered: Although it is unknown if metallurgic bellows (i.e. air-blowing device) in the Han dynasty (202 BC – 220 AD) were of the leather bag type or the wooden fan type found in the later Yuan dynasty (1279–1368), the Eastern Han dynasty mechanical engineer and politician Du Shi (d. 38 AD) applied the use of rotating ...