Provision may be made for fresh outdoor air to be added to recirculated room air. The filters are normally placed in the return air, just before the heating and cooling components. Air quality is enhanced in forced-air systems through the use of filters. Forced air systems use a blower fan and ductwork to distribute conditioned air to points of use. The most common absorption systems used for air conditioning use water as an absorbent and ammonia as a refrigerant or lithium bromide salt as an absorber and water as a refrigerant.įor heating purposes, most air conditioning systems use fossil-fueled furnaces to heat air, or boilers to heat water or produce steam. Absorption systems may use a pump to help circulate the refrigerant.
PACKAGE CENTRAL AC UNIT EXPELS COLD AIR INSTEAD OF HOT GENERATOR
Absorption refrigeration systems work by evaporating refrigerant in an evaporator, with the refrigerant vapor then absorbed by an absorbent medium, from which it is subsequently expelled by heating in a generator and changed back into liquid in a condenser. Some air conditioning systems use an absorption refrigeration system (Figure 2). Liquid refrigerant passes through an expansion device into an evaporator where it boils and expands into a vapor, absorbing heat in the process. Pressurized refrigerant is liquefied in a condenser, liberating heat. A compressor serves as a pump, pressurizing the refrigerant and circulating it through the system. Vapor-compression refrigeration systems employ a cycle in which a volatile liquid, the refrigerant, is vaporized, compressed, liquefied, and expanded continuously in an enclosed system. Most air conditioning systems utilize a vapor-compression refrigeration system (Figure 1) to transfer the indoor heat to a suitable heat sink such as the outdoors. Process air conditioning is the modification of the indoor environment to enhance an industrial or a scientific process. Most applications, is used to modify and maintain the indoor environment for habitation. Comfort air conditioning, which accounts for Normally the assembly includes a heating system for modifying winter indoor temperature and humidity a refrigeration system for modifying summer temperature and humidity, a means to maintain indoor air quality (i.e., air filters and fresh air intake) a method of distribution of conditioned air and a control system, such as a thermostat, to maintain desired comfort conditions.Īir conditioning systems fall into two broad classes. Common use of the term " air conditioning" applies it to the cooling of air however, true air conditioning treats all aspects of indoor atmospheric comfort.Īn air conditioning system uses an assembly of equipment to treat air. Air conditioning is the treatment of air to control simultaneously its temperature, humidity, cleanliness, and distribution to meet the requirements of a conditioned space.
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