HVAC · Practice-Exam-1 · Problem 59 PDF Solution in PDF ↓
HVAC · Practice-Exam-1 · Problem 59
Problem & Solution
PDF: HVAC-Practice-Exam-1-59.pdf
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  • Problem: A fan rated for 15 BHP is controlled by a variable frequency drive and runs at 900 rpm, which is 50% of its maximum speed, supplying 20,000 CFM of air...
  • Key step: We can find in the reference handbook P1 is equal to P2 times N1 over N2 quantity squared.
  • Watch out: We don't want that to change, so just because we're changing the filters, doesn't mean we would accept having more or less flow, unless there was more...
  • Result: And that is under root, and that equals 1102 rpm.
  • ✅ Answer: A
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MPEP OH Prep Dashboard Problem 59 · Practice-Exam-1 PDF-Embedded Format