Surface water heat pumps (SWHPs) are energy-efficient devices for heating and cooling that use surface water as a heat source and sink.

水源热泵是一种利用地下浅层水资源(地表水或地下水)，既可供暖又可制冷的高效节能热泵系统。

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It is found that the floor surface temperature variety exponentially with time after the change of water condition, and the heat lag in the heating period is about half of that in cooling period.

发现供水状态变化后，地板表面温度随时间呈指数变化，升温期的稳定时间约为降温期的一半。

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The paper deals with endanger of scaling on heating surface of boiler and importance of boiler water treatment.

论述了锅炉受热面结垢的危害及水质管理工作的重要性。

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Moons that orbit their planet too closely will experience strong tidal heating and a runaway greenhouse effect that would boil away any surface water.

MSN: News editor