This preview shows page 1. Sign up to view the full content.
Unformatted text preview: which? 5. Compute the efficiency of a 2 ton heat pump in heating mode for following conditions. RefrigerantR134A Indoor temperature70 F Outdoor temperatures40, 20, 0 F Compressor isentropic efficiency70% Sketch the cycle on a Ph diagram for each outdoor temperature condition on the same plot. Graph the efficiencies (kW/ton or COP) for all three outdoor temperature cases to see how efficiencies vary. 6. For the conditions in problem 5, compute the threshold price for gas ($/therm) in which the heat pump is equivalent in cost to gas heat. You may assume efficiency of the gas furnace to be 80%. Any conclusions?...
View
Full
Document
This note was uploaded on 08/01/2008 for the course MAE 406 taught by Professor Eckerlin,terry during the Fall '07 term at N.C. State.
 Fall '07
 ECKERLIN,TERRY

Click to edit the document details