The air handling unit comprising of the centrifugal blower and the air filter is located above the cooling coil. Above these components the evaporator or the cooling coil is located. In the packaged units with the water cooled condenser, the compressor is located at the bottom along with the condenser (refer the figure below). This whole packaged air conditioning unit externally looks like a box with the control panel located externally. The shell and tube type of condenser is compact in shape and it is enclosed in a single casing along with the compressor, expansion valve, and the air handling unit including the cooling coil or the evaporator. The water has to be supplied continuously in these systems to maintain functioning of the air conditioning system. The condenser is of shell and tube type, with refrigerant flowing along the tube side and the cooling water flowing along the shell side. In these packaged air conditions the condenser is cooled by the water. Packaged Air Conditioners with Water Cooled Condenser An outside fan pulls air across the external parts of the system to cool and condense the refrigerant. The air ducts generally run either below the ceiling and inside the rooms (conditioned air) or in the attic (unconditioned air). In a “forced air” system, an internal blower circulates the conditioned air through ducts to the rooms where the cooler air is needed. The refrigerants, widely recognized by the trademark “freon” (which is a registered trademark of the DuPont company for refrigerants), helps cool and dehumidify the inside air. The term “split” simply means that components are divided into inside and outside portions as opposed to being located together in a “package” unit. The refrigerant has to be re-cooled and condensed, and outside air is the medium most often used to accomplish this. The majority of home and smaller commercial air conditioning systems circulate a compressed gas refrigerant in a closed “split” system to cool and condition inside air.
How package air conditioners work: Components and functions of AC units
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