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REFRIGERATION HVAC MECHANIC RED SEAL LICENSE EXAM REVIEWER - water flow rate of chiller
PROBLEM:
A chiller has a capacity of 75 tons with a heat rejection ratio (HRR) of 1.3. If the change in temperature is 10F, solve for the water flow rate in US gallons per minute and imperial gallons per minute.
Given
chiller capacity = 75 tons
heat rejection ratio = 1.3
delta T = 10F
Unknown
US gpm
imperial gpm
SOLUTION:
Converting tons to Btu/hr
Q = 75 tons x 12,000 Btu/hr per ton = 900,000 Btu/hr
Incorporating the HRR and rearranging the main equation,
US gpm = Q x HRR/(500 x delta T)
US gpm = 900,000 x 1.3/(500 x 10)
US gpm = 234 US gallons
To solve for imperial gallons, change the constant to 600
imperial gpm = Q x HRR/(600 x delta T)
imperial gpm = 900,000 x 1.3/(600 x 10)
imperial gpm = 195 imperial gpm
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