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A reversed Carnot engine is operating as a heat pump and consumes 6 kW of power...

A reversed Carnot engine is operating as a heat pump and consumes 6 kW of power and has a COPh of 3.0. The heat pump is turned on to warm up a house that contains 1800 kg of air initially at 12 C and finally at 21 C. How long will this take?

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