系统高压侧产生如此低压强的最可能原因是制冷剂不足。
The most likely cause of such low pressure in the high pressure side of the system would be insufficient refrigerant.
这将导致制冷剂离开蒸发器后仍存在蒸发现象，因此会在不当位置吸收热能，导致制冷效果不足。
This will lead to the refrigerant evaporating after the evaporator and will therefore absorb the heat energy in the wrong place thus resulting in insufficient cooling performance.
由于R410，R407系列混合制冷剂在替代R22方面的不足，更多新型的制冷剂列入了研究。
More novel refrigerants is studied because of the shortage of R410 and R407 series in replace projects of R22 system.
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