HVAC · Practice-Exam-2 · Problem 45
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HVAC · Practice-Exam-2 · Problem 45
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Problem: A 90% efficient pump normally delivers 50GPM of 50 degree chilled water at a head of 20 feet of water with a rotational speed of 900 rpm.
Key step: What is the percent increase in break horsepower required to increase the volume flow rate by 10%.
Watch out: So we don't want to make the assumption that the pump is operating at maximum capacity.
Result: What I mean by that is BHP2 as compared to BHP1 is equal to the ratio of N2 to N1 cube.
✅ Answer: C
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