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在蒸气压缩系统中,膨胀装置是冷凝器后面的又一个主要部分。膨胀装置的作用是降低进入蒸发器的液体制冷剂的压力,从而在较低的温度发生沸腾。膨胀装置通常需要起的其它作用是调节进入蒸发器的制冷剂流量使之与热负荷相协调,并且控制离开蒸发器的蒸气状况,这佯制冷剂蒸气能以适合的状况到达压缩机,在对压缩机没有不良的作用下被有效地压缩。膨胀装置是两个部分之一,它将系统分为高压和低压侧两个部分。当作用在液体上的压力降低时,液体会发生轻微的膨胀,并伴随着沸点的降低,并且如果膨胀继续进入到液体/蒸气区域,温度降低就更明显。离开冷凝器的液体很少被冷却到比冷凝器中的饱和温度低9°F(5℃),并且如果不进一步提供冷却,就将以该温度到达膨胀装置。通
In vapor compression systems, the expansion device is another major component behind the condenser. The role of the expansion device is to reduce the pressure of the liquid refrigerant entering the evaporator, thereby boiling at a lower temperature. Other functions normally required by an expansion device are to regulate the flow of refrigerant into the evaporator in harmony with the heat load and to control the vapor conditions leaving the evaporator where the refrigerant vapor can reach the compressor in a suitable condition, The compressor is effectively compressed without any adverse effects. The expansion device is one of two parts that divides the system into two parts, the high pressure and the low pressure side. As the pressure acting on the liquid decreases, the liquid slightly expands with concomitant decrease in boiling point, and the temperature decrease becomes more pronounced if expansion continues to the liquid / vapor region. Liquid leaving the condenser is rarely cooled to 9 ° F (5 ° C) below the saturation temperature in the condenser and will reach the expansion device at this temperature if no further cooling is provided. through