For the reasons of nature conservation great attention is paid at the systems that use low-grade heat sources in their work (that is heat energy of soils, air, discharge and drain).
原因自然保护的关注在系统使用低品位热源的工作(热能的土壤、空气、放电和排水)。
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。
In industrial processes, almost 50% of thermal energy transforms into low-grade waste heat discharged directly, which leads to energy waste and environmental pollution.
工业生产中的热能，约50%以低品位余热的形式直接排放，既浪费能源又污染环境。
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