Cooling-tower+AC+Units

=__Chilled-water and Cooling-tower AC Units__= In a **chilled-water system**, the entire air conditioner lives on the roof or behind the building. It cools water to between 40 and 45 F (4.4 and 7.2 C). This chilled water is then piped throughout the building and connected to air handlers as needed. The cooling tower creates a stream of lower-temperature water. This water runs through a heat exchanger and cools the hot coils of the air conditioner unit. Cooling towers works the same principles: The amount of cooling that you get from a cooling tower depends on the **relative humidity** of the air and the **barometric pressure** which measures the pressure.
 * 1) A cooling tower blows air through a stream of water so that some of the water evaporates.
 * 2) Generally, the water trickles through a thick sheet of open plastic mesh.
 * 3) Air blows through the mesh at right angles to the water flow.
 * 4) The evaporation cools the stream of water.
 * 5) Because some of the water is lost to evaporation, the cooling tower constantly adds water to the system to make up the difference.