This paper will also be an important reference for the research and development of liquid thermoacoustic engines with low-grade heat source.

该文也将是研究和开发低品位热源液相热声热机的重要参考。

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Due to the limitations of technical conditions and knowledge, at that time they didn't set low-grade heat recovery system in the process of acid.

由于受建设时期技术条件和认识的局限，其制酸装置的中、低温位余热回收不够完善。

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Water source heat pump of mine waste heat recovery is a new type of high grade energy saving technology, which pump low-grade heat into high-grate thermal energy.

回收矿井余热的水源热泵技术是一种把低品位热能转化为高品位热能的一种新型节能环保技术。

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Thermoelectric materials convert low-grade heat wasted in industrial processes or exhaust systems of a vehicle into electricity.

FORBES: The Trillion Mile-Per-Gallon Engine

IMechE says this process is only 25% efficient but it is massively improved by co-siting the cryo-generator next to an industrial plant or power station producing low-grade heat that is currently vented and being released into the atmosphere.

BBC: Liquid air 'offers energy storage hope'