Problem
1. A heat exchanger increases the exergy of 6 lbm/s water by 800 Btu/lbm using 20 lbm/s air coming in at 2500 R and leaving with 250 Btu/lbm less exergy. What are the irreversibility and the second law efficiency?
2. Find the second-law efficiency of the heat pump in Problem 8.159E.
Problem 8.159E
A heat pump has a COP of 2 using a power input of 15 000 Btu/h. Its low temperature is T0 and its high temperature is 180 F, with ambient at T0. Find the fluxes of exergy associated with the energy fluxes in and out.
The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.