Chillers operate on natural gas or propane gas. See Fig. 17-2. Gas is used for the major job of cooling. Electricity is used for the…
Category: Air Conditioning
Ammonia is also used as a refrigerant in a gas-fired system. As the ammonia is moved through the system, it changes state becoming strong and…
The absorption type of air-conditioning equipment works on two basic principles: a salt solution absorbs water vapor and the evaporation of water causes cooling. In…
There are three main types of gas air-conditioning cycles used today: compression, absorption, and dehumidification. In both compression and absorption cycles, air temperature and humidity…
The console air conditioner is a self-contained unit. These units come in 2- to 10-hp sizes. They are used in small commercial buildings, restaurants, stores,…
To produce air conditioning for large areas, such as department stores and office buildings, it is necessary to use another means of cooling the air.…
A boiling refrigerant in an evaporator absorbs heat. The evaporator pressure must be low for boiling to take place. To produce the low pressure, it…
In some locations, it is possible to use the cooling tower principles to condense the refrigerant. This method has the usual problems with water and…
The direct multizone system unit is roof mounted and can be used for cooling and heating. See Fig. 16-6. It can use chilled water for…
Before performing any maintenance on the unit, make sure the main line switch is open or in the OFF position. Label the switch so that…