Chapter 5, Problem 5.32P

A heat engine running between a pit at 15 degree and an energy storage that is 50 times warmer than the pitworks. 2/3 of the generated power is used to run the Carnot heat pump, which heats an home. Heatpump draws heat from the air at 4 degree and keeps the home at 15 degree. So the heat loss of homeis 61000 kJ / h;a. Describe the system by drawing it schematically.b. Calculate the minimum heat that should be transferred to the heat engine.

A heat engine input heat 20 kJ and gives an output of 6000 J. Determine the thermal efficiency and rate of heat rejection. Select one: O a. 50% and 26 KJ O b. 30% and 14 KJ O C. 42.85% and 14 KJ O d. 30% and 26 KJ

(a)  A food compartment is to be maintained at 21°C by a refrigeration system. The total coolingload of the food compartment is estimated to be 330 kJ/h and the heat rejection by thecondenser is 480 kJ/h. The outdoor air temperature is 35°C.                                                                                      i) draw the schematic diagram of the refrigeration systemii) determine the power input required to operate the refrigeration system in kW. (b)  A heat pump operates on a Reversed Carnot cycle with a COP of 7. It keeps the temperatureof a space at 23°C by consuming 2.5 kW of power.                                                                                                     i) draw the schematic diagram of the heat pumpii) find the temperature of the reservoir from which the heat is absorbed in °C.iii) find the heating load provided by the heat pump in kW.