HVAC · Practice-Exam-2 · Problem 37PDFSolution in PDF ↓
HVAC · Practice-Exam-2 · Problem 37
Problem & Solution
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Problem: And air handling unit uses the hot water coil to produce 20,000 CFM of 120 degrees supplier.
Key step: The entering air is composed of 5,000 CFM of 25 degree outside air and 15,000 CFM of 75 degree return air.
Watch out: So that's 1.08 times 20,000 and we don't have to rate units when we use these rules of thumb and the delta t on the air side is 120 leaving minus 62.5...
Result: And that equals 82.8 gpm and we don't have to worry about all the units that comes out in gpm as long as this numerator is BTU per hour which it is.
✅ Answer: B
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