HVAC · Practice-Exam-1 · Problem 80PDFSolution in PDF ↓
HVAC · Practice-Exam-1 · Problem 80
Problem & Solution
Video Synthesis
Problem: 1-pound per second of saturated liquid water at 50 psi a and there's a mixing chamber along with 1-pound per second of super heated steam at 50 psi a ...
Approach: So let's start with a little sketch of this mixing chamber So if we get a sense of what's going on we've got two streams entering stream one is going ...
Watch out: So let's start with a little sketch of this mixing chamber So if we get a sense of what's going on we've got two streams entering stream one is going ...
Result: That's 12.84.1 So now we know the mass flow rate at 1 and 2 and 3 and we know the enthalpy is at 1 and 2 So the only thing we don't know is h3 and we ...
✅ Answer: C
Office Hours
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Student questions asked in live office hours about this problem
OH 124 · July 6, 2026
Q: Why is it reasonable to assume the mixed outlet stream has the same pressure as the two inlet streams?
A: If the two streams enter at the same pressure, the outlet mixture is implied to be at that same pressure because there is no stated pressure-driving mechanism or loss model that would let you determine a different value. Dan emphasized that pressure differences drive flow from high to low, so equal incoming pressures make the equal outlet-pressure assumption the only reasonable way forward.