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)
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)
q e = evaporator water flow rate (gal/min)
Condenser Flow Rate
The condenser water flow rate:
q c = h tons 30 / dt (3)
q c = condenser water flow rate (gal/min)
Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort.
Calculating chiller and cooling tower refrigeration loads - in tons.
Typical relations between cooling power (tons cooling), air flow and duct size
Sizing cooling water pipe lines - maximum allowable flow, velocity and pressure drops.
Air conditioner heat loads and evaporator and condenser water flow rates.