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介绍了中央空调中所使用冷热源的种类与基本特点，着重分析了风冷热泵冷热水机组及其它类型热泵的应用对节能和环保所起的作用和使用中应注意的问题。
The types and basic characteristics of the cold and heat sources used in central air-conditioning were introduced. The role of air-cooled heat pump chillers and other types of heat pumps for energy saving and environmental protection and the issues that should be taken into account during application were analyzed.