Chapter 5, Problem 5.7E

c) Assess the limiting factors that impact on the economics of heat pumps.d) Conduct a cost-benefit analysis on the installation of a ground source heat pump on asmallholding, and make valid recommendations for improvements.

Differentiate Refrigerator from Heat pumps in terms of: (a) Transfer of Heat, (b) Location of the evaporator, (c) Location of the condenser, and (d) Working of evaporator and condenser.

Define thermal energy reservoir?

A heat engine converts mechanical work to heat. Select one: O True O False

The maximum possible (Carnot) efficiency of a heat engine operating between constant temperature reservoirs is depends on A. the maximum and minimum pressure. B. the total amount of work done. C. the heat entering the system and leaving the system. D. the maximum and minimum operating temperatures of the reservoirs.

Choose correct answer: Refrigerators and heat pumps operate on the same cycle but differ in their objectives.     Select one: True False

(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.

What would be the maximum COP for a heat pump operating in your house if the outside temperature is 55 F? Draw a heat flow diagram. How much cheaper will this be than electrical heating?

For a building located in Moscow, Russia with annual heating degree-days (dd) of 6232, a heating load (heat loss) of 52,000 kj/h, and a design temperature difference of 40° C (20° C indoor), estimate the annual energy consumption. If the building is heated with a furnace with an efficiency of 92%, how much gas is burned to keep the home at 20° C. State yourassumptions.