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Unformatted text preview: 2.10. REFRIGERATION 67 Compressor 4 w Compressor Condenser Evaporator Expansion valve 3 2 1 Figure 2.19: Schematic diagram for the vapor-compression refrigeration cycle. of performance, , is defined as = what one wants what one pays for , (2.454) = q L w c . (2.455) Note that a heat pump is effectively the same as a refrigerator, except one desires q H rather than q L . So for a heat pump, the coefficient of performance, , is defined as = q H w c . (2.456) It is possible for both and to be greater than unity. Example 2.11 (from Moran and Shapiro, p. 442) R 12 is the working fluid in an ideal vapor-compression refrigeration cycle that communicates thermally with a cold region at 20 C and a warm region at 40 C . Saturated vapor enters the compressor at 20 C and saturated liquid leaves the condenser at 40 C . The mass flow rate of the refrigerant is 0 . 008 kg/s . Find compressor power in kW , refrigeration capacity in ton , coefficient of performance, and...
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- Fall '11