How does an automobile and refrigerator operate based on the concepts of heat pump and heat engine?

Heat engines
any device that converts heat energy to work. It requires a high- temperature source from which heat can be removed, a low- temp, leceptacle called a sink into which heat can be delivered and a way to convert this into work

A gasoline engine is a heat engine – once the gasoline is burnt it generates heat. The engine takes that high temperature heat, generates power and discharges heat at lower temperature.

A refrigerator is a heat pump which takes in low temperature heat, uses power and discharges heat at a higher temperature.

In those thermodynamic terms one is the reverse of the other.

Betty Boop-So does an automobile-1939

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