Aheat pump operates on a carnot heat pump cycle with a cop of 8.7. it keeps a space at 26 ℃ by consuming 4.25 kw of power. determine the temperature of the reservoir from which the heat is absorbed and the heating load provided by the heat pump.

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]