1. By removing energy by heat transfer from its freezer compartment at a rate of 1.25 kW, a refrigerator maintains the freezer at 2268C on a day when the temperature of the surroundings is 228C. Determine the minimum theoretical power, in kW, required by the refrigerator at steady state.
2. At steady state, a refrigeration cycle maintains a clean room at 558F by removing energy entering the room by heat transfer from adjacent spaces at the rate of 0.12 Btu/s. The cycle rejects energy by heat transfer to the outdoors where the temperature is 808F.
(a) If the rate at which the cycle rejects energy by heat transfer to the outdoors is 0.16 Btu/s, determine the power required, in Btu/s.
(b) Determine the power required to maintain the clean room's temperature by a reversible refrigeration cycle operating between cold and hot reservoirs at 558F and 808F, respectively, and the corresponding rate at which energy is rejected by heat transfer to the outdoors, each in Btu/s.