Carbon dioxide is used in the ideal-gas refrigeration system of Fig. 10.21. The gas enters the compressor at 150 kPa and 2 158C. The gas leaves the compressor at 1.2 MPa. The CO2 ewers the turbine at 40 8C, Calculate the temperature at state 4 and the coefficient of performance for this system. Assume constant specific heats and ideal components.

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out Heat D/ L exchanger Turbine ompressoI Heat exchanger Cool ai Warm air