太阳能和热泵热水器设备，节电，运行绝对安全，而且运行费用低，可节省人员成本。

The solar energy and the heat pump water heater equipment, does not need the value to defend, movement absolute safety, moreover the completely automatic control, may save the personnel cost.

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介绍了直膨式太阳能辅助热泵热水器(DX - SAHPWH)的基本结构和工作原理。

This paper introduces the typical configurations and operation principles of the direct-expansion solar-assisted heap pump water heater (DX-SAHPWH).

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