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Please include all units in the solutions. 8. We decide to store 200 MJ of electrical energy by driving a heat pump which transfers heat

Please include all units in the solutions.

8. We decide to store 200 MJ of electrical energy by driving a heat pump which transfers heat from 20C to molten salt at 500C. This energy is retrieved later by running a heat engine between the same two temperatures.Both the heat pump and the engine can be described by efficiencies W/QH, and they both have the same ideal (Carnot) efficiency.

A. What is the ideal efficiency of the heat pump?

B. Assuming ideal efficiency, how much heat energy is transferred to the molten salt?

C. The actual efficiency of the engine is only 50%.How much work is retrieved?

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