为此，将零过热度时间作为一个重要的指标，用于电子膨胀阀的启动控制；

It is found that the superheat may be zero for a long time. A new index, Zero Superheat Time, was put forward, and applied to the electronic expansion valve control.

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热力膨胀阀的开度受控于蒸发器出口的制冷剂过热度，通过开度的调节，达到调节蒸发压力和控制制冷剂过热度的作用；

The opening degree of the thermo-mechanic expanding valve is controlled by the over-heating degree of the refrigerant at the outlet of the evaporator.

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