Refrigerant-22 absorbs heat from a cooled space at 508F as
Chapter 8, Problem 865E(choose chapter or problem)
Refrigerant-22 absorbs heat from a cooled space at 508F as it flows through an evaporator of a refrigeration system. R-22 enters the evaporator at 108F at a rate of 0.08 lbm/s with a quality of 0.3 and leaves as a saturated vapor at the same pressure. Determine (a) the rate of cooling provided, in Btu/h, (b) the rate of exergy destruction in the evaporator, and (c) the second-law efficiency of the evaporator. Take T0 5 778F. The properties of R-22 at the inlet and exit of the evaporator are: h1 5 107.5 Btu/lbm, s1 5 0.2851 Btu/lbmR, h2 5 172.1 Btu/lbm, s2 5 0.4225 Btu/lbmR.
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