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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)

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 )

## Related Topics

• ### Air Conditioning Systems

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

## Related Documents

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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## Citation

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

Modify the access date according your visit.

7.8.15

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