Can heat engine do anything else energy wise other than deliver work?

NO

Explanation:

A heat engine is a device which uses thermal energy or chemical energy or heat energy and convert this energy into mechanical energy in the form of force and motion. This mechanical energy is nothing but the work developed by the heat engine. The heat engine's efficiency is defined as the work output or work delivered divided by the energy input.

Thus the main purpose of a heat engine is to deliver work.

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Explanation:

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