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蓄能对分布式能源系统的效率有较大影响。本文对于分布式能源系统中蓄能的相变温度,分别采用熵产极值,(火积)耗散极值与广义热阻极值进行优化。结果表明,(火积)耗散极值与广义热阻极值作为优化准则所得的最优相变温度对应蓄热取热功率的极大值。此外,基于(火积)耗散分析方法,分析了二级蓄能的蓄热取热能力,结果表明二级蓄能的蓄热取热量比单级蓄能大,二级蓄能与单级蓄能蓄热量之比与冷热流体入口温度无关,仅与传热单元数有关,且当传热单元数趋于无穷大时,二级蓄能与单级蓄能的蓄热量之比趋于四分之三。
Energy storage has a greater impact on the efficiency of distributed energy systems. In this paper, entropy production extremum, exergy dissipation extremum and generalized heat resistance extremum are respectively optimized for phase transition temperature of energy storage in distributed energy system. The results show that the optimal phase transition temperature (heatsumption) extremum and generalized heat resistance extremum as the optimization criterion correspond to the maximum of heat storage and retrieval power. In addition, based on the method of (impulse) dissipation analysis, the heat storage and heat removal capacity of the second-stage storage is analyzed. The results show that the second-stage storage has higher heat storage capacity than the single stage, The ratio of energy stored to stored heat has nothing to do with the inlet temperature of hot and cold fluid, only with the number of heat transfer units, and when the number of heat transfer units tends to infinity, the ratio of stored energy of single- Thirds.