A household refrigerator has a freezer at TF and a cold space at TC from which energy is r...

A household refrigerator has a freezer at TF and a cold space at TC from which energy is removed and rejected to the ambient at TA, as shown in Fig. P8.20. Assume that the rate of heat transfer from the cold space, QC, is the same as from the freezer, Q F , and find an expression for the minimumpower into the heat pump. Evaluate this power when TA = 20°C, TC = 5°C, TF = −10°C, and Q F = 3 kW.

FIGURE P8.20