Because of having high efficiency, energy saving, little effect on environment and steady operation, water source heat pump and ground source heat pump are promising in Guiyang.

水源热泵和地源热泵由于具有高效节能、对环境影响小、运行稳定等特点，在贵阳地区很有发展前途。

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Therefore, use of water source heat pump is clean and renewable energy as a technology.

所以说，水源热泵利用的是清洁的可再生能源的一种技术。

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This paper briefly introduces the principle of water source heat pump (WSHP), analyzes various open water systems and gives some advices that can be taken in different circumstances.

简要介绍水源热泵系统原理，对其开式水系统作了分析，给出不同应用条件下可以采用的水系统建议。

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To put that figure in context, Iannelli says that the energy required to pump freshwater from underground (which, he says, is the most common source of drinking water in the West) typically produces just over 1.5 tonnes of CO2 per million gallons.

CNN: Counting the carbon cost of bringing water to the desert