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2. Compressed-air energy storage - Wikipedia

   en.wikipedia.org/wiki/Compressed-air_energy_storage

   A pressurized air tank used to start a diesel generator set in Paris Metro. Compressed-air-energy storage (CAES) is a way to store energy for later use using compressed air. At a utility scale, energy generated during periods of low demand can be released during peak load periods. [1]

3. Expansion tank - Wikipedia

   en.wikipedia.org/wiki/Expansion_tank

   An expansion tank or expansion vessel is a small tank used to protect closed water heating systems and domestic hot water systems from excessive pressure. The tank is partially filled with air, whose compressibility cushions shock caused by water hammer [ citation needed ] and absorbs excess water pressure caused by thermal expansion .

4. Turboexpander - Wikipedia

   en.wikipedia.org/wiki/Turboexpander

   If the expansion of the flue gas does not provide enough power to drive the air compressor, the electric motor-generator provides the needed additional power. If the flue gas expansion provides more power than needed to drive the air compressor, then the electric motor-generator converts the excess power into electric power and exports it to ...

5. Auxiliary power unit - Wikipedia

   en.wikipedia.org/wiki/Auxiliary_power_unit

   The first German jet engines built during the Second World War used a mechanical APU starting system designed by the German engineer Norbert Riedel.It consisted of a 10 horsepower (7.5 kW) two-stroke flat engine, which for the Junkers Jumo 004 design was hidden in the intake diverter, essentially functioning as a pioneering example of an auxiliary power unit for starting a jet engine.

6. Stirling engine - Wikipedia

   en.wikipedia.org/wiki/Stirling_engine

   A Stirling engine is a heat engine that is operated by the cyclic expansion and ... low-power portable generator would facilitate such sales ... gas tank, or even ...

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