膨胀机对外输出功造成气体的压力、温度降低，焓值减小。气体减少了能量，使它增加的吸热能力，称为膨胀机的制冷量。因此，膨胀机的制冷量也就是指它在膨胀过程中对外作功的大小，等于气体在膨胀过程减小的焓值。当膨胀机进口的比焓为h1，出口的比焓为h2时，单位数量的气体的制冷量即为h1-h2。已知膨胀机进、出口气体的温度和压力，可以从气体的热力性质图上查到相应的比焓值。
Natural gas will become the fastest-growing demand energy of the global energy consumption. High-performance expansion refrigeration equipments suited for operating condition of high pressure are needed urgently for natural gas' expansion refrigeration technology.
全球对能源的消费中,天然气将成为需求增长最快的能源,而在天然气加工工艺中需要能在高压下操作且高效的气体膨胀制冷设备。
参考来源 - 多管静止式气波制冷机振荡特性研究·2,447,543篇论文数据，部分数据来源于NoteExpress
本文简要介绍膨胀机制冷原理及大庆油田膨胀制冷脱水装置的试验情况。
The principles of expander refrigeration and the testing situation of expander refrigeration dehydration apparatus in Daqin Oil Field are briefly introduced in this paper.
在简述阶式制冷工艺、混合制冷工艺和膨胀制冷工艺的基础上，介绍了上述3套国内液化天然气工厂的工艺原理。
With describing the cascade refrigeration technique, the mixing refrigeration technique, and the expanding refrigeration technique, the working principle of the above 3 LNG plants is introduced.
将天然工质N2O用于跨临界循环，建立了相应的理论模型，比较了CO2和N2O用于跨临界两级压缩膨胀制冷循环的性能。
The results show that N2O plays a better comprehensive performance than CO2 in transcritical two stage compression expander refrigeration cycle.
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