HVAC · Practice-Exam-2 · Problem 40PDFSolution in PDF ↓
HVAC · Practice-Exam-2 · Problem 40
Problem & Solution
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Problem: A 25-foot-long hot water pipe with 3-inch outside diameter has an average surface temperature of 175 degrees in a room with an ambient temperature of ...
Key step: The convection coefficient is 2 BT for our foot squared degree F.
Watch out: So we don't want to ignore radiation and we've also been told to temperature not only of the room in general but also the surfaces so that's helpful t...
Result: Sigma is 0.1713 and has units of B2 per hour per foot squared ranking to the 4th and actually this is times 10th and negative A that's pretty importan...
✅ Answer: C
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