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Determination of charged pressure of working fluid and its effect on the operation of a miniature CLHP

机译:确定工作流体的增压压力及其对小型CLHP运行的影响

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In this paper, a miniature cryogenic loop heat pipe (CLHP) with nitrogen as the working fluid was designed, and the principle and calculation method to determine the charged pressure of working fluid were proposed and experimentally validated. Meanwhile, the effect of reduced charged pressure of working fluid on the operation of the CLHP such as the supercritical startup, matching characteristics of heat loads applied to the primary and secondary evaporators and heat transport capacity was experimentally investigated. Experimental results reveal that with an appropriate charged pressure of working fluid, the CLHP can reliably realize the supercritical startup, the primary evaporator can operate independently when the heat load applied to the primary evaporator is larger than a certain threshold value, and it achieves a heat transport capacity of 12 W. The effect of reduced charged pressure of working fluid on the supercritical startup and heat transport capacity of the CLHP is not salient. However, it has significant effect on the matching characteristics of heat loads applied to the primary and secondary evaporators, and the secondary evaporator must be kept in operation to assist the normal operation of the primary evaporator even though the heat load applied to the primary evaporator is comparatively large.
机译:本文设计了一种以氮气为工作流体的微型低温回路热管,提出了确定工作流体充气压力的原理和计算方法,并进行了实验验证。同时,通过实验研究了工作流体充注压力降低对CLHP运行的影响,例如超临界启动,施加在一级和二级蒸发器上的热负荷的匹配特性以及传热能力。实验结果表明,在适当的工作流体充注压力下,CLHP能够可靠地实现超临界启动,当施加于主蒸发器的热负荷大于一定阈值时,主蒸发器可以独立运行,并达到热能。输送能力为12W。工作流体的增压压力降低对CLHP的超临界启动和传热能力的影响并不明显。但是,这对施加到主蒸发器和副蒸发器的热负荷的匹配特性有重大影响,并且即使施加到主蒸发器的热负荷为零,副蒸发器也必须保持运行以辅助主蒸发器的正常运行。较大。

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