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Why is a cooling device less efficient than a heat engine?

Why is a cooling device less efficient than a heat engine?

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Answer: - Cooling devices are categorized as follows 1) air cooling 2) liquid cooling. Cooling devices are less efficient than heat engine. Heat engines are as follows: 1) Not much heat takes place compared to liquid cooling. 2) Not suitable for massive engines. 3) Not suitable for stagnant engines. 4) Need massive fins around the cylinder to increase the surface to enhance heat removal. 5) Less efficient for small engines. 6) Need to build liquid jackets around cylinder to remove heat. 7) Extra equipment like radiator pipes, motor are required.

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