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) =?

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.