论文部分内容阅读
现有液氦温区回热式低温制冷机的实验测量和理论仿真研究几乎都采用氦-4为工质,改用氦-3为工质时低温制冷机理论上可突破氦-4的λ相变限制,获得低于2K的无负荷制冷温度,并在液氦温区获得更大制冷量.通过比较氦-3与氦-4的热物理性质差异以及低温制冷机回热器仿真计算,从回热器损失、制冷量、相对COP等多个方面定量分析了分别采用氦-3和氦-4为工质时低温回热器的性能.证明氦-3工质可以显著改进回热式气体制冷机的低温制冷性能.
The experimental measurement and theoretical simulation of the existing cryogenic reheat cryogenic refrigerator with liquid helium temperature almost all adopt helium-4 as the working fluid, and when the helium-3 is used as the working fluid, the cryogenic refrigerator theoretically can break through λ of helium-4 Phase transition, the unloaded refrigeration temperature less than 2K is obtained, and a larger refrigeration capacity is obtained in the liquid helium temperature.By comparing the thermophysical properties of helium-3 and helium-4 and the simulation of the regenerator of the cryogenic refrigerator, The performance of cryogenic recuperator with helium-3 and helium-4 as working fluid was quantitatively analyzed from the aspects of regenerator loss, cooling capacity, relative COP, etc. It was proved that the working condition of helium-3 can significantly improve the heat recovery Low Temperature Refrigeration Performance of Gas Chillers.