An internally reversible refrigerator has a modified coefficient of performance accounting for realistic heat transfer processes of

where q_in is the refrigerator cooling rate, q_out is the heat rejection rate, an W is the power input. Show that COPm can be expressed in terms of the reservoir temperatures T_c and T_h, the cold and hot thermal resistances R_t,c and R_t,h, and q_in, as

where R_tot = R_t,c + R_t,h. Also, show that the power input may be expressed as

Transcribed Image Text:

COP Ti 9in W lout Gin Thị T