The building described in problem 13.1 is to be heated using a heat pump whose capacity Qcap (kW), and COP vary with ambient temperature ta (°C) according to the equations: The conditions for the...

The building described in problem 13.1 is to be heated using a heat pump whose capacity Qcap (kW), and COP vary with ambient temperature ta (°C) according to the equations:

The conditions for the occupied and unoccupied periods are the same as in problem 13.1. The degradation factor due to cycling of the heat pump is 0.25. Calculate (i) the heat pump balance temperatures, (ii) the electrical energy input to the heat pump, and (iii) the auxiliary energy input required, for the occupied and unoccupied periods. Plot the energy flow rates versus temperature curves.