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Unformatted text preview: to the compressor, necessary to provide a heating rate of 30 kW. 3. A cascade vapor refrigeration system is designed to remove Q L = 20 kW from a cooled space. The temperature of the evaporator in the bottom stage is-20 C, and the condenser in the top stage is at 1 MPa. Assuming that both compressors are isentropic, and that the bottom stage condenser pressure is equal to the upper stage evaporator pressure, determine the optimum bottom stage condenser pressure which minimizes the power input to the cycle. 1...
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- Spring '11