Active Control of the Operating Temperature in a Loop Heat Pipe with Two Evaporators and Two Condensers
Active Control of the Operating Temperature in a Loop Heat Pipe with Two Evaporators and Two Condensers
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具有两个蒸发器和两个冷凝器的环路热管工作温度的主动控制
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通讯作者：
Nasa Goddard
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作者：
Jcntung Ku;Nasa Goddard
多蒸发器回路热管的工作温度是总热负荷、蒸发器间热负荷分配、冷凝器温度和环境温度的函数。由于涉及到许多变量，操作温度也比具有单个蒸发器的LHP显示出更多的蒸发。通过将其补偿室（CC）温度控制在所需的设定点，可以实现严格的温度控制。本文介绍了一种双蒸发器双冷凝器LHP运行温度主动控制的试验方案。通过加热一个或两个CC来实现温度控制。执行的测试包括启动、电源循环、散热器温度循环、CC温度循环和毛细管极限。试验结果表明，无论一个或两个CC的加热到设定点温度，其中一个CC的总是充满液体。在大多数条件下，包括一些快速瞬变，回路都能成功地工作在所需的临界点温度。然而，在低热负荷下，可能由于蒸发器芯内的蒸汽含量的突然变化，CC温度可能突然增加到设定点温度以上。
The operating temperature of a loop heat pipe (LHP) with multiple evaporators is a function of the total heat load, heat load distribution among evaporators, condenser temperature and ambient temperature. Because of the many variables involved, the operating temperature also showed more hystereses than an LHP with a single evaporator. Tight temperature control can be achieved by controlling its compensation chamber (CC) temperatures at the desired set point. This paper describes a test program on active control of the operating temperature in an LHP with two evaporators and two condensers. Temperature control was achieved by heating one or both CC's. Tests performed included start-up, power cycle, sink temperature cycle, CC temperature cycle, and capillary limit. Test results show that, regardless one or two CC's were heated to the set point temperature, one of CC's was always flooded with liquid. The loop could operate successfully at the desired sct point temperature under most conditions, including some fast transients. At low heat loads, however, the CC temperature could suddenly increase above the set point temperature, possibly due to a sudden change of the vapor content inside the evaporator core.