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首页> 外文期刊>Chemical and Petroleum Engineering >IMPROVING THE EFFICIENCY OF A GIFFORD-MCMAHON CRYOGENIC REFRIGERATOR
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IMPROVING THE EFFICIENCY OF A GIFFORD-MCMAHON CRYOGENIC REFRIGERATOR

机译：提高Gifford-McMahon低温冰箱的效率

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A numerical study of the performance of a single-stage Gifford–McMahon refrigerator was performed. A description of the mathematical model of the refrigerator operating with an unsteady flow of helium is given. Adequacy of the mathematical model was confirmed by comparing its results with published reliable data on tests of a refrigerator with cooling capacity of 30.2 W at 80 K. Using the wave approach, a method was developed that made it possible to study the time behavior of helium temperatures at direct and counter-flow helium blow at the regenerator inlet and outlet, as well as packing in its middle part. It is shown that for small amplitudes of temperature fluctuations, it is possible to reduce the length of the regenerator by 20–25% without diminishing its performance indicators. From the analysis of the operation of a single-stage cryogenic refrigerator, it is established that the main source of thermodynamic losses in it is the substantial non-equilibrium heat exchange between helium in the cold cavity and the wall of the working cylinder. A two-fold increase of heat transfer surface in the cold cavity will increase the cooling capacity of the refrigerator by 25%, i.e., up to 37.9 watts.
机译：进行了对单级Gifford-McMahon冰箱性能的数值研究。给出了用不稳定的氦流量操作的冰箱的数学模型。通过将其结果与在80K的冷却能力的冰箱的测试结果进行比较来确认数学模型的充分性。使用波动方法，开发了一种方法，使得可以研究氦的时间行为在再生器入口和出口处直接和反流氦气吹的温度，以及其中间部分的包装。结果表明，对于小的温度波动的小幅度，可以将再生器的长度降低20-25％而不减少其性能指示器。从分析单级低温冰箱的操作，建立了热力学损失中的主要来源是冷腔中的氦气与工作缸的壁之间的实质性非平衡热交换。冷腔中的传热表面的两倍增加将使冰箱的冷却能力增加25％，即，高达37.9瓦。

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