A heat pump is used to extract heat from the outside atmosphere to heat the inside of a building. On a day when the outside air temperature is Tc°C, the heat pump is operating to a COP of 2.7, maintaining the inside temperature of the building at Th°C. If the building is losing heat at the rate of 62,893 kJ/hour in these conditions, determine how much power (kW) must be supplied to a heat pump.

A homeowner is trying to decide whether to heat with a furnace rated at 95% efficiency or by an electrically powered heat pump. She lives in a town where electricity is produced by a coal-fired power plant that claims to operate with 1st law efficiency that is 55% of the Carnot limit. The heat pump's CoP is advertised to be 40% of the Carnot limit. For what range of outside temperatures To would the 2nd law efficiency of the furnace be greater than that of the heat pump? Assume T+ = 400°C, T- = T= 40°C. %3D

Solve this question carefully, write clearly and circle the final answer for the temperature of the source with the units of ( R) 

“Heat can never pass from a colder to warmer body without another concurrent change within.” What is the concurrent change (or work) done by the modern refrigerator allowing heat to flow to a warmer body?     1st law of thermodynamics     Expansion and cooling     Compression and heating of refrigerant     3rd law of thermodynamics     Expansion and heating