In practice, the wasted heat energy may be recovered and utilized by certain equipment so that energy will be saved and environment be improved.
实践中，可以通过某种设备系统将其回收利用，既节约了宝贵的一次能源，又改善了环境质量。
There is much energy in furnace slag in molten state. Several foreign recovery methods of heat from the slag are presented and utilization methods of the energy recovered are analyzed.
熔融状态下的炉渣含有大量能量，介绍了国外几种从炉渣中回收热量的方法，对回收的能量如何利用进行了分析。
Low level heat energy is recovered from municipal wastewater using wastewater source heat pump.
利用污水水源热泵，可回收城市污水的低位能源。
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