Chilled-Water System

Chilled-water systems formulas - evaporator and condenser flow rates

In a chilled-water system the air conditioner cools water down to 40 - 45^oF (4 - 7^oC). The chilled water is distributed throughout the building in a piping system and connected to air condition cooling units wherever needed.

Total Heat Removed

The total heat removed by air condition chilled-water installation can be expressed as

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 expressed as

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 can be expressed as

q_c = h_tons 30 / dt         (3)

where

q_c = condenser water flow rate (gal/min)

h_tons = air condition cooling load (tons)

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