Question

A heat pump uses R-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between 26 psia and 138 psia. Determine (on a per unit mass basis) (a) the amount of heat transferred from the refrigerated space, (b) the amount of heat rejected by the cycle, (c) the work input required by the compressor, (d) the quality at the exit of the throttle valve, and (e) and the COP.

Answer 1

2.-138psis ebm A 26 Psia, h, cha = 104.29 Bullbm, Sg. 0,22439 BtulebmR At 138 Psia S2 = 5, = 0.22439 2 = 120,65 Bry by=ht@ 138 pria = 45.146 Brullen hus hy [throtting Process] 26 Psig Ref = h, hy = 104.29 - 45.146 = 59.144 Bry Obm ₂ -h₂ = 120.65 -451146 = 75.504. Bry b) Orei = ebm c) Win - han h = 120.65-104,29 = 16:36 Brullen d) At 26 psia, ha hf - 14.945, heg= 89.345 My = nf tanfg = 45.146 = 14,945 + x 189.345) a=0.34 e) cop= hych = h, 75.504 1838-14161] Ano 4.61 Ane. 16.36