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Development of a phase change material (PCM)-based thermal switch

机译:开发相变材料(PCM)的热开关

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摘要

A thermal switch is an ON/OFF heat transfer control device which can be utilised in different modern fields such as cryogenics, solar energy systems, micro/nano-electronic cooling, the aerospace industry and building energy efficiency. In this study, paraffin wax is used to design and build a thermal switch based on phase change material (PCM). When the paraffin wax is heated and melts, one contact plate is pushed to make contact with another plate to turn the switch ON due to the pushing force generated by the volume expansion of the paraffin wax. Conversely, when the paraffin wax does not get enough heat to melt, the condition of the thermal switch is in the OFF state due to an air gap between the two plates. The ON/OFF thermal conductance ratio of the thermal switch is the major figure of merit and is investigated experimentally. The results show that the effective thermal conductivity of the PCM-based thermal switch in the ON state is recorded at 188.7 W/mK, while 6.2 W/mK is obtained in the OFF state. Therefore, the ON/OFF thermal conductance ratio is estimated at about 30.
机译:热开关是开/关传热控制装置,可用于不同的现代领域,如低温,太阳能系统,微/纳电子冷却,航空航天工业和建筑能效。在该研究中,石蜡蜡用于基于相变材料(PCM)来设计和构建热开关。当石蜡被加热并熔化时,推动一个接触板以与另一个板接触以使开关导致接通,由于由石蜡蜡的体积膨胀产生的推力。相反,当石蜡蜡没有足够的热量来熔化时,由于两个板之间的气隙,热开关的条件处于关闭状态。热开关的ON / OFF导热比是实验研究的主要值。结果表明,在ON状态下的PCM的热开关的有效导热率在188.7W / MK中记录,而在关闭状态下获得6.2W / mk。因此,估计开/关热导流比约30。

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