Consider two reversible refrigerators operating in series. The first refrigerator removes heat at the rate of 250 kW from a space to be maintained at -23°C and rejects heat to an intermediate temperature reservoir. The second refrigerator removes the heat received by the intermediate temperature reservoir and rejects heat to the ambient reservoir at 27°C. Coefficient of performance of the second refrigerator is 80% of the first refrigerator.
(a) Determine the temperature (°C) of the intermediate reservoir.
(b) Calculate the total power (kW) required to operate both the refrigerators.
(c) What is the rate of heat transfer (kW) for the ambient reservoir?