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