HVAC · Heat-Transfer · Problem 8PDFSolution in PDF ↓
HVAC · Heat-Transfer · Problem 8
Problem & Solution
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Problem: Heat transfer 8, 60GPM of hot water is produced by a steam heat exchanger.
Given: 60GPM of hot water is produced by a steam heat exchanger; 5 PSIG saturated steam is provided and the condensate leave...
Approach: 5 PSIG saturated steam is provided and the condensate leaves as a saturated liquid.
Key formula: equation is going to be an m dot delta h and we have m dot and we should be able to get the delta h as out of the ste...
Calc: If cold water enters at 55 degrees, what is the temperature of the leaving hot water in the collect losses?
Calc: And it is 55 degrees when it enters and there are 60GPM flowing and then leaving.
Result: The left side of this equation works out to 1.9 million p2 per hour and the right side is 30,000 times t minus 55 ignore the sirens and if you divi...
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Student questions asked in live office hours about this problem
OH 102: HVAC: Heat Transfer #8
Q: Should the steam side of this heat exchanger be treated as a closed loop that stays at 5 PSIG, or does it open to atmosphere at the condensate tank?
A: Yes—treat it as a closed loop at 5 PSIG throughout the coil; there's no pressure-reducing mechanism within the coil itself. The steam enters at 5 PSIG saturated, undergoes phase change (condensation), and gives up its latent heat to the water side while remaining at that pressure. Any pressure reduction would occur further downstream in the condensate return system, not within this heat exchanger.