首页> 外文期刊>International Journal of Heat and Mass Transfer >Correction of the enthalpy-temperature curve of phase change materials obtained from the T-History method based on a transient heat conduction model
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Correction of the enthalpy-temperature curve of phase change materials obtained from the T-History method based on a transient heat conduction model

机译:基于瞬态热传导模型的T历史法获得的相变材料的焓-温曲线的校正

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摘要

Utilizing the latent heat of materials undergoing phase transitions, or so called phase change materials (PCMs), for thermal energy storage offers higher storage densities compared to purely sensible thermal energy storages. For evaluating different PCMs the T-History method has often been applied by researchers in order to determine the characteristic enthalpy versus temperature curves. In previous research many different T-History setups are described where the sample holder is insulated. The intention is to decrease internal temperature gradients inside the sample holder with PCM. However, in the mathematical model for evaluating the enthalpy curve of the PCM based on the measured temperature response, the thermal mass of the insulation around the sample holder has been neglected. In this study, a one dimensional numerical transient heat transfer model is used to show that neglecting the insulation thermal mass leads to a systematic error on the obtained enthalpy versus temperature curves. The error is caused by deviations in the transient heat flows for reference and PCM sample when both are cooled down or heated, respectively. These deviations can be corrected by introducing a correction factor.
机译:与纯粹敏感的热能存储相比,利用经历相变的材料(即所谓的相变材料(PCM))的潜热提供更高的存储密度。为了评估不同的PCM,研究人员经常采用T历史法来确定特征焓与温度的关系曲线。在先前的研究中,描述了许多不同的T历史记录设置,其中样品架是绝缘的。目的是通过PCM降低样品架内部的内部温度梯度。然而,在用于基于测得的温度响应来评估PCM的焓曲线的数学模型中,样品架周围的绝缘体的热质量被忽略了。在这项研究中,使用一维数值瞬态传热模型来表明忽略绝缘热质量会导致在获得的焓与温度曲线上出现系统误差。误差是由于分别冷却或加热时,参考样品和PCM样品的瞬态热流发生偏差而引起的。这些偏差可以通过引入校正因子来校正。

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