An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid  maintains a condenser at 800 kPa and the evaporator at 15 kPa. Given 300 kW of cooling load,  determine the following:  3. Estimate the reversible COP values, if the low and high medium temperature are as for the  evaporator and condenser.  4. Determine the Refrigeration effect (RE), heat of compression (HOC), and heat of rejection  (HOR) and their corresponding rate/power values in kW.  5. Estimate the COPR using thermodynamic tables

A two-stage compression refrigeration system with an adiabatic liquid-vapor separation unit like that in the figure uses refrigerant-134a as the working fluid. The system operates the evaporator at 100 psia the condenser at 300 psia, and the separator at 200 psia. The compressors use 29 kW of power. Determine the rate of cooling provided by the evaporator and the COP of this cycle. The refrigerant is a saturated liquid at the inlet of each expansion valve and a saturated vapor at the inlet of each compressor, and the compressors are isentropic. (Take the required values from saturated refrigerant-134a tables.) 2 Compressor Compressor (8) m6 Condenser Separator The rate of cooling provided by the evaporator is 5 ↓ Evaporator Btu/h, and the COP of the refrigerator is

4. An ideal vapor-compression heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20°C when the outside temperature is 5°C. Saturated vapor at 2.4 bar leaves the evaporator, and saturated liquid at 8 bar leaves the condenser. Calculate (a) The power input to the compressor, in kW. (b) The coefficient of performance. (c) The coefficient of performance of a Carnot heat pump cycle operating between thermal reservoirs at 20 and 5 °C.

An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at 800 kPa and an evaporator at -18°C. Determine this system's COP and the amount of power required to service a 100 kW cooling load. (Take the required values from saturated refrigerant-134a tables.) 3 4 Warm environment OH Condenser Expansion valve Evaporator QL Cold refrigerated space The amount of power required is ↑ (2) in Compressor 1 kW, and the COP of the system is