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提出了用于预测混合工质脉管制冷热力学性能的改进型Brayton制冷循环 ,建立了制冷系统制冷量和制冷系数COP的理论表达式。在对多种低温流体的预测计算的基础上 ,提出了具有应用潜力的混合工质对。计算结果表明 ,如果用10 %氮与 90 %氦的混合工质对代替纯氦 ,脉管制冷机在 80K温度下的制冷系数和制冷量分别可以提高 9 5%和 6 7%。此外还讨论了其它可能用于 80K温区脉管制冷的混合工质对 ,如氢 氦、氩 氦、氖 氦混合物等。
An improved Brayton refrigeration cycle is proposed for predicting the thermodynamic performance of mixed-vessel pulse cooling. The theoretical expression of refrigeration capacity and COP is established. Based on the predictions of a variety of cryogenic fluids, a mixed working fluid pair with potential applications was proposed. The calculation results show that the refrigeration coefficient and the cooling capacity of the pulse tube refrigerator can be increased by 95% and 67% at the temperature of 80K, respectively, if the mixture of 10% nitrogen and 90% helium is used instead of pure helium. In addition, other pairs of mixed working fluids that may be used for pulse tube cooling in the 80K temperature zone are discussed, such as hydrogen helium, argon helium, neon helium mixtures, and the like.