Chilled Water Systems

In a chilled water system the water is cooled down to 40 - 45 ^oF (4 - 7 ^oC) by an centralized evaporator, distributed throughout the building in pipes and connected locally to air condition cooling units wherever needed.

Total Heat Removed

The total heat removed by an air condition chilled-water system can be calculated

h = 500 q dt                                                           (1)

where

h = total heat removed (Btu/h)

q = water flow rate (gal/min)

dt = temperature difference (^oF)

Evaporator Flow Rate

The evaporator water flow rate can be calculated

q_e = h_tons 24 / dt                                                       (2)

where

q_e = evaporator water flow rate (gal/min)

h_tons = air condition cooling load ( tons)

Condenser Flow Rate

The condenser water flow rate:

q_c = h_tons 30 / dt                                                   (3)

where

q_c = condenser water flow rate (gal/min)

h_tons = air condition cooling load, chiller tonnage ( tons)