Question

A refrigerator works on the carnet cycle in temperature between -7°C and 27'C. It makes 500 kg of ice per hour at-5'C from water at 14'C. Find H.P required to drive the compressor and C.O.P. of the cycle. Take specific heat of ice as 2.1 KJ/Kg-k and latent heat as 336 kJ/Kg

Answer 1

COP = $\dfrac{Q}{W} = \dfrac{T_C}{T_H-T_C}$

T_H = 27°C = 273K + 27 = 300K

T_C = -7°C = 273K - 7 = 266k

COP = $\dfrac{266}{300-266}$ = $\dfrac{266}{34}$ = $7.824$