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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 o F (4 - 7 o C) 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 ( o F)

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 )

Related Topics

• Air Conditioning

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

Related Documents

• Calculating Cooling Loads

Calculating chiller and cooling tower refrigeration loads - in tons.
• Cooling Power vs. Airflow and Duct Sizes

Typical relations between cooling power (tons cooling), air flow and duct size
• Cooling Water - Pipe Lines

Sizing cooling water pipe lines - maximum allowable flow, velocity and pressure drops.
• Water Evaporator and Condenser Equations

Air conditioner heat loads and evaporator and condenser water flow rates.

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• The Engineering ToolBox (2005). Chilled Water Systems. [online] Available at: https://www.engineeringtoolbox.com/chilled-water-d_955.html [Accessed Day Month Year].

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