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Optimal allocation of heat exchangers in a Supercritical carbon dioxide power cycle for waste heat recovery

机译：超临界二氧化碳功率循环中用于废热回收的热交换器的最佳分配

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摘要

Supercritical carbon dioxide (sCO(2)) power cycles have attracted attention because of their high efficiency and flexibility in various temperature heat sources including low-temperature waste heat applications. In waste heat applications, the size of the heat exchangers is an important issue because of the trade-off between performance and installation cost. For the optimal design of an sCO(2) cycle for waste heat recovery, a thermodynamic model for the basic cycle and the preheating cycle was constructed. The heat exchangers were then modeled by a finite volume analysis under the fixed total UA value, with the equivalent conductance representing the size of the heat exchanger. The net power and thermal efficiency of the cycle were calculated. The results of the optimization confirmed that the application of the preheater improves the performance of the basic cycle, and an optimum point of the split ratio exists. From the simulation, with an increase in the turbine inlet temperature (TIT), the thermal efficiency improves, but the net power does not always increase. Instead, a close linearity between the optimum CO2 split ratio (phi) and the turbine inlet temperature was found at the maximum net power, even under different turbine inlet pressures and total UA values. From these results, the configuration of heat exchangers for waste heat applications can be planned appropriately to operate at the maximum net power.
机译：由于超临界二氧化碳（sCO（2））的功率循环在各种温度热源（包括低温废热应用）中的高效性和灵活性，引起了人们的关注。在废热应用中，由于在性能和安装成本之间进行权衡，热交换器的尺寸是重要的问题。为了优化废热回收的sCO（2）循环设计，构建了基本循环和预热循环的热力学模型。然后在固定的总UA值下通过有限体积分析对热交换器建模，等效电导率代表热交换器的大小。计算了循环的净功率和热效率。优化结果证实了预热器的应用提高了基本循环的性能，并且存在分流比的最佳点。通过模拟，随着涡轮机入口温度（TIT）的增加，热效率会提高，但净功率并不总是增加。相反，即使在不同的涡轮机入口压力和总UA值下，在最大净功率下，最佳CO2分配比（phi）和涡轮机入口温度之间也存在接近的线性关系。根据这些结果，可以适当计划用于废热应用的热交换器的配置，以使其以最大净功率运行。

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