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首页> 外文会议>World Renewable Energy Congress >Numerical and experimental development of medium temperature thermal energy storage (Erythritol) system for the hot side of LiBr/H_2O air conditioning applications
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Numerical and experimental development of medium temperature thermal energy storage (Erythritol) system for the hot side of LiBr/H_2O air conditioning applications

机译：LIBR / H_2O空调应用的中温热能储存（赤藓糖醇）系统的数值和实验开发

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摘要

The effect of axisymmetric assumption to ignore the thermal conductivity of a PCM in the direction of the heat transfer fluid has been experimentally demonstrated using temperature gradients ( dT / dx - temperature differences per metre) along the axial, radial and angular directions. The experiment was conducted using a shell and tube system of a medium temperature phase change thermal energy storage material, Erythritol with a melting point of 117.7°C. The results show that the temperature gradient in the axial and angular directions were 1.2% and 10.2% respectively of that recorded in the radial direction. This explains why most previous models for the shell and tube system were derived by ignoring the thermal conductivity in the axial direction (direction parallel to the heat transfer fluid) and as such solutions only apply to idealized one and two-dimensional systems. A one-dimensional finite difference numerical model was developed based on the shell and tube system. Results from the model predictions were validated using measured experimental results from the melting of the medium temperature phase change material. The overall average prediction showed a 3.1% difference from the measured experimental data and the deviation occurred in two areas; at the beginning of the phase change where the model ignored the heat conduction resistance of the heat transfer tube wall and at the end of the phase change where the effect of natural convection within the PCM was not accounted for.
机译：通过沿轴向，径向和角度方向的温度梯度（DT / DX - 温度差）实验证明了轴对称假设在传热流体方向上忽略了PCM的导热率的影响。使用介质温度相变热能储存材料的壳和管系统进行实验，熔点为117.7°C的赤藓糖醇。结果表明，轴向和角度方向上的温度梯度分别为径向记录的1.2％和10.2％。这解释了为什么通过忽略轴向（与传热流体的方向）忽略导热率的最先前的壳和管系统模型，并且由于这种解决方案仅适用于理想的一个和二维系统。基于壳和管系统开发了一维有限差分数值模型。使用测量的实验结果验证了模型预测的结果，该实验结果是介质温度相变材料的熔化。总体平均预测显示与测量的实验数据的3.1％差异，两个区域发生偏差;在相变的开始，模型忽略了传热管壁的热传导电阻，并且在相变的末端不会占PCM内自然对流的影响。

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