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6. Using an engine of 45% thermal efficiency to drive a refrigerator having a COP of 3, a. Draw the heat engine and heat pump diagram as described with a suitable label What is the heat input into the engine for 5 MJ removed from the cold body by the refrigerator? b. If this system is used as a heat pump, how many MJ of heat would be available for heating for 5 MJ of heat input to the engine? C.

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T H CopR H E TC Tc Hcat eninc Cy etc. Cycle heat input fD Heat engine-)

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