Question

Find the maximum possible coefficient of performance for a heat pump used to heat a house in a northerly climate in winter.

The inside is kept at 24^circ{rm C} while the outside is -24^circ{rm C}.
Express your answer using two significant figures.

COP(max)=???

Answer 1

Inside temperature T = 24 ^o C

                                = 24 + 273

                                = 297 K

Out side temperature T ' = -24 ^o C

                                     = -24 + 273

                                     = 249 K

COP _max = T / (T - T ' )

               = 6.18