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首页> 外文期刊>International Journal of Heat and Mass Transfer >Reliability and heat transfer performance of a miniature high- temperature thermosyphon-based thermal valve
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Reliability and heat transfer performance of a miniature high- temperature thermosyphon-based thermal valve

机译：微型高温热虹吸型热力阀的可靠性和传热性能

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摘要

Latent heat thermal energy storage systems have the advantages of near isothermal heat release and high energy density compared to sensible heat, generally resulting in higher power block efficiencies. Until now, there has been no highly effective and reliable method to passively extract that stored latent energy. Most modern attempts rely on external power supplied to a pump to move viscous heat transfer fluids from the phase change material (PCM) to the power block. In this work, the problem of latent heat dispatchability has been addressed with a redesigned thermosyphon geometry that can act as a “thermal valve” capable of passively and efficiently controlling the release of heat from a thermal reservoir. A bench-scale prototype with a stainless steel casing and sodium working fluid was designed and tested to be reliable for more than fifty “on/off” cycles at an operating temperature of 600 °C. The measured thermal resistances in the “on” and “off” states were 0.0395 K/W and 11.0 K/W respectively. This device demonstrated efficient, fast, reliable, and passive heat extraction from a PCM and may have application to other fields and industries using thermal processing.
机译：与显热相比，潜热热能存储系统具有接近等温热释放和高能量密度的优势，通常会导致更高的功率块效率。迄今为止，还没有一种高效，可靠的方法来被动地提取存储的潜能。大多数现代尝试都是依靠提供给泵的外部电源将粘性传热流体从相变材料（PCM）移动到功率块。在这项工作中，通过重新设计的热虹吸管几何形状解决了潜热分配问题，该热虹吸管几何形状可以充当“热阀”，能够被动有效地控制蓄热器的放热。设计并测试了具有不锈钢外壳和钠工作液的台式样机，并在600 C的工作温度下进行了五十多次“开/关”循环测试，性能可靠。在“开”和“关”状态下测得的热阻分别为0.0395 K / W和11.0 K / W。该设备证明了从PCM进行高效，快速，可靠和被动的排热，并且可能已应用于使用热处理的其他领域和行业。

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