# Chilled Water Systems

## Chilled water system equations - evaporator and condenser flow rates

In a chilled water system the water is cooled down to 40 - 45oF (4 - 7oC) 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

qe = htons 24 / dt                                                       (2)

where

qe = evaporator water flow rate (gal/min)

htons = air condition cooling load (tons)

### Condenser Flow Rate

The condenser water flow rate:

qc = htons 30 / dt                                                   (3)

where

qc = condenser water flow rate (gal/min)

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

## Related Topics

• Air Conditioning - Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort

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