Ever wondered how hotels, hospitals, airports, theaters, and other large buildings fulfilled their cooling needs? Well, you can stop wondering. Buildings with very high cooling loads rely on central air conditioning plants to get the job done.
This article from BrightHub.com goes into greater detail about these air conditioning machines.
When traditional air conditioners are not enough to completely cool a massive multi-story building, central air conditioning plants are used instead, but how do they work?
Central air conditioning plants require a dedicated room in which the compressor, condenser, thermostatic expansion valve and evaporator are kept. These systems function the same way they do in any other air conditioning unit, except they are much larger in scale and have higher capacities. These massive machines pump out cooled air, which is sent throughout the building with the use of ductwork, resulting in quiet, yet highly efficient air conditioning in every room.
To operate and maintain central air conditioning systems you need to have good operators, technicians and engineers. Proper preventative and breakdown maintenance of these plants is vital.
There are two types of central air conditioning plants or systems:
1) Direct expansion or DX central air conditioning plant: In this system the huge compressor, and the condenser are housed in the plant room, while the expansion valve and the evaporator or the cooling coil and the air handling unit are housed in separate room. The cooling coil is fixed in the air handling unit, which also has large blower housed in it. The blower sucks the hot return air from the room via ducts and blows it over the cooling coil. The cooled air is then supplied through various ducts and into the spaces which are to be cooled. This type of system is useful for small buildings.
2) Chilled water central air conditioning plant: This type of system is more useful for large buildings comprising of a number of floors. It has the plant room where all the important units like the compressor, condenser, throttling valve and the evaporator are housed. The evaporator is a shell and tube. On the tube side the Freon fluid passes at extremely low temperature, while on the shell side the brine solution is passed. After passing through the evaporator, the brine solution gets chilled and is pumped to the various air handling units installed at different floors of the building. The air handling units comprise the cooling coil through which the chilled brine flows, and the blower. The blower sucks hot return air from the room via ducts and blows it over the cooling coil. The cool air is then supplied to the space to be cooled through the ducts. The brine solution which has absorbed the room heat comes back to the evaporator, gets chilled and is again pumped back to the air handling unit.
To see if you could benefit from a packaged air conditioning system, contact Fresh Air Concepts by calling 1-800-708-4FAC or click here today!