为了强化相变储热单元的储热性能,基于(煅)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、(煅)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(煅)耗散率就越大,储存热量的品质也越低.证明了(煅)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(煨耗散率)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.
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