What is the thermal and mechanical efficiency

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What is the thermal and mechanical efficiency for this engine when used as heat pump and refrigerator with the following propties;

Temperature difference (with respect to 21° C): Refrigerator: -4 K (reservoir: +6 K) Heat pump: +13 K (reservoir: -1 K)

Power varies (1_4)W

RPM varies (1000_650)

Generator voltage=6 V

Reference no: EM13720679

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