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为了强化相变储热单元的储热性能,基于(火积)耗散原理,数值分析了相变材料的熔点对储热单元的储热速率、(火积)耗散率及储热品质的影响。结果表明:对于单级相变储热单元,相变材料熔点越低,相变储热过程的传热速率就越高,而对应的(火积)耗散率就越大,储存热量的品质也越低。证明了(火积)耗散原理用于相变储热过程优化的可行性。对于两级相变储热单元的分析结果表明,合理的匹配两级相变材料的熔点,可以实现储热速率高于单一相变材料,且传热过程的不可逆性((火积)耗散率)低于单一相变材料。可见,多级相变材料的合理匹配,可以同时提高储热速率、降低储热过程的不可逆性。
In order to enhance the heat storage performance of phase change thermal storage unit, the heat storage rate, (heat accumulation) dissipation rate and thermal storage quality of the thermal storage unit are numerically analyzed based on the principle of influences. The results show that for the single-stage phase-change thermal storage unit, the lower the melting point of the phase-change material, the higher the heat transfer rate during the phase-change thermal storage and the corresponding (Fire Product) dissipation rate. The quality of the stored heat Also lower. It is proved that the principle of (FA) dissipation can be used to optimize the phase change heat storage process. The results of two-stage phase change thermal storage unit show that the reasonable match of the melting point of two-stage phase change material can achieve higher thermal storage rate than the single phase-change material, and the irreversibility of heat transfer Rate) lower than a single phase change material. It can be seen that the reasonable matching of multi-level phase change materials can simultaneously improve the heat storage rate and reduce the irreversibility of the heat storage process.