Performance optimization of two-stage latent heat storage unit based on entransy theory
Performance optimization of two-stage latent heat storage unit based on entransy theory
复制标题
基于火积理论的两级潜热蓄热机组性能优化
DOI：
10.1016/j.ijheatmasstransfer.2014.05.049
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发表时间：
2014
影响因子：
5.2
通讯作者：
Tao W. Q.
中科院分区：
文献类型：
--
作者：
Tao Y. B.;He Y. L.;Liu Y. K.;Tao W. Q.
为了提高相变蓄热过程的性能，并为相变蓄热材料的选择和匹配提供依据，基于能积理论，数值分析了相变蓄热材料熔化温度对相变蓄热速率、能积耗散速率和蓄热质量的影响。对于单级LHS单元，虽然降低PCM熔化温度可以增加蓄热率，但较低的熔化温度导致较大的能积耗散，降低蓄热质量。蓄热率越大，则能积耗散率越大，这与能积耗散极值理论相一致。对于两级LHS装置，通过合理匹配相变材料的熔化温度，可以提高蓄热率，降低能积耗散率。然后基于能量理论对两段相变材料的熔化温度进行了优化匹配。结果表明，两段相变材料的熔化温度存在一个最佳匹配，以获得最大的传热速率或最小的能积耗散速率。给出了两级相变材料最佳温度的计算公式，为相变材料的选择和匹配提供了依据。
In order to enhance the performance of the latent heat storage (LHS) process and provide the criterion for the selection and match of the multistage PCMs, the effects of PCMs melting temperatures on the heat storage rate, entransy dissipation rate and heat storage quality were numerically analyzed based on the entransy theory. For the single stage LHS unit, although decreasing the PCM melting temperature can augment the heat storage rate, the lower melting temperature causes larger entransy dissipation and reduces the heat storage quality. The larger heat storage rate results in the larger entransy dissipation rate, which is accordant with the entransy dissipation extremum theory. For the two-stage LHS unit with reasonably matching the PCMs melting temperature, the heat storage rate can be augmented and the entransy dissipation rate can be reduced. Then the optimization for the match of the two-stage PCMs melting temperatures was performed based on the entransy theory. The results show that there is an optimal match of the two-stage PCMs melting temperatures to achieve the maximum heat transfer rate or the minimum entransy dissipation rate. And the formulas for the optimum two-stage PCMs temperatures were presented, which can provide the criterions for the selection and match of the PCMs.