Solved: A household refrigerator operates with cold- and
Chapter , Problem 1.39(choose chapter or problem)
A household refrigerator operates with cold- and hot-temperature reservoirs of Tc 5 C and Th 25 C, respectively. When new, the cold and hot side resistances are Rc,n 0.05 K/W and Rh,n 0.04 K/W, respectively. Over time, dust accumulates on the refrigerators condenser coil, which is located behind the refrigerator, increasing the hot side resistance to Rh,d 0.1 K/W. It is desired to have a refrigerator cooling rate of qin 750 W. Using the results of 1.38, determine the modified coefficient of performance and the required power input W under (a) clean and (b) dusty coil conditions.
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