TFS · Thermodynamics · Problem 21PDFSolution in PDF ↓
TFS · Thermodynamics · Problem 21
Problem & Solution
Video Synthesis
- Problem: 500 pounds per hour of 300 psi, 800 degree steam is mixed with 1200 pounds per hour of 300 psi steam or the quality of 50%.
- Approach: We need the masses which we have.
- Key step: 500 pounds per hour of 300 psi, 800 degree steam is mixed with 1200 pounds per hour of 300 psi steam or the quality of 50%.
- Watch out: So for p2 which is also 300 psi and I guess we could be specific and say it's psia and there the temperature is not known but the quality is known so ...
- Result: Now fortunately both streams entering steam superheated steam for state 1 and the saturates you from state 2 we're both 300 psi a so the resulting mix...
- ✅ Answer: B
Office Hours
1
Student questions asked in live office hours about this problem
OH 91
Q: If the two mixing streams had different pressures, how would you determine the pressure of the mixed stream?
A: If the final mixture is saturated, you can use energy balance to find H3, then look it up directly in the saturated steam table to find pressure—saturation alone gives you enough information. If the result is superheated, you'd need additional information beyond just enthalpy, and would need to apply energy balance differently, potentially using properties like mass flow rates and temperature changes.