Central Air Condition The central air conditions are used in large buildings, hotels, theaters, airports and shopping malls which are to be air conditioned completely. Central air conditions are used for applications like big hotels, large buildings having multiple floors, hospitals, etc, where very high cooling loads are required. If the entire building is to be cooled it is not economically feasible to put window or split air conditioner in each and every room, further these small units cannot satisfactorily cool the large halls, auditoriums, receptions areas etc, so it is always better to use central air conditions in these places. Function of Central air condition- In the central air condition there is a plant room where large compressor, condenser, thermostatic expansion valve and the evaporator are kept in the large plant room. They perform all the functions as usual similar to a typical refrigeration system. However, all these parts are larger in size and have higher capacities. The compressor is of open reciprocating type with multiple cylinders and is cooled by the water just like the automobile engine. The compressor and the condenser are of shell and tube type. While in the small air conditioning system capillary is used as the expansion valve, in the central air conditioning systems thermostatic expansion valve is used. In Central air condition cool air is passed via the ducts to all the rooms, halls and other spaces that are to be air conditioned. Thus in all the rooms there is only the duct passing the chilled air and there are no individual cooling coils, and other parts of the refrigeration system in the rooms. What is we get in each room is the completely silent and highly effective air conditions system in the room. Further, the amount of chilled air that is required in the room can be controlled by the openings depending on the total heat load inside the room. The central air conditions are highly sophisticated applications and many a times they tend to be complicated. It is due to this reason that there are very few companies in the world that focus in these systems. In the modern era of computerization a number of additional electronic utilities have been added to the central conditioning systems.
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