W QH Oleak = K (TH-TL) HP 0 A heat pump has a COP Hp = 0.4 COP PHP, Carnot and maintains a house at T = 20 C, while it leaks energy out as = KTH - TL) [kW] where K = 0.8 . For a maximum of W = 0.7 kW power input, find the minimum outside temperature, TL for which the heat pump is a sufficient heat source. (25 Outside temperature (°C) =?

In the winter, in order to keep the classroom steadily at 68 f before 10 pm, heating with an average rate of 42,000 btu/hr is provided. assume the outdoor temperature maintains at 32°f, determine the electrical power (kw) required to (a) operate a reversible heat pump (b) operate a real heat pump with a cop (7) of 4.5 and (c) operate an electrical-resistance heater.