An air-to air heat pump has a capacity of 10 tons at its balance point. the characteristics of the heat pump and that of the building is as shown in figure 2.6.3. at a typical winter operation, the outside air temperature is at 15 °f. determine (a) the building load (b) the capacity of heat pump (c) the power supplied by the supplementary resistance heaters (d) the cop of the heat pump (e) and the equivalent cop of the heat pump, after accounting for the supplementary energy supplied