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REFRIGERATION HVAC MECHANIC RED SEAL LICENSE EXAM REVIEWER - water temperature entering chiller
PROBLEM:
A 60 ton chiller circulates 160 US gallons of water. What is the temperature rise? If the water supply temperature is 45F, determine the temperature of the water entering the chiller.
Given
Cooling capacity = 60 tons
gpm = 160 US gallons
suppy temperature = 45F
Unknown
Temperature rise = ? or change in temperature (delta T)
Temperature of water entering chiller = ? or return temperature
SOLUTION:
Converting tons to Btu/hr
Q = 60 tons x 12,000 Btu/hr per ton = 720,000 Btu/hr
Rearranging the main equation Q = 500 x gpm x delta T
delta T = Q/(500 x gpm)
delta T = 720,000/(500 x 160)
delta T = 9 F
return temperature = delta T + supply temperature
return temperature = 9 + 45
return temperature = 54 F
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