TFS · Heat Transfer · Problem 8PDFSolution in PDF ↓
TFS · Heat Transfer · Problem 8
Problem & Solution
Video Synthesis
Topic: Heat exchanger / heat transfer — A locker room has 12 showers supplied with hot water from a steam heat exchanger.
Approach: So let's start with the water side.
Key values: 500 pounds per hour of 5 psi g steam is supplied to the heat exchanger and leaves saturated, 500 pounds per hour and we know hfg is 960 BT per pound so the heat from the steam is 480, 5 psi
Reference: look up in the steam table properties of saturated water and steam
✅ Answer: C
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Student questions asked in live office hours about this problem
OH 107
Q: In a steam-water heat exchanger problem, the problem states the steam is 'saturated' but doesn't specify if it's saturated liquid or saturated vapor—how can I determine which one without additional process information?
A: Good question—'saturated' alone is ambiguous since it could be anywhere on the vapor dome. However, you can deduce it must be saturated liquid (not a mixture or vapor) because the problem is solvable: if it were a two-phase mixture, you'd need quality information you weren't given. Additionally, the latent heat released during condensation from saturated vapor to saturated liquid is what makes this heat exchanger effective; sensible heat alone from superheated steam wouldn't be enough to heat the water as required.