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Chilled Water Systems

Chilled water system equations - evaporator and condenser flow rates.

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)


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)


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)


q c = condenser water flow rate (gal/min)

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

Related Topics

  • Air Conditioning Systems

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

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