Optimization of ejector-expansion transcritical CO2 heat pump cycle
Optimization of ejector-expansion transcritical CO2 heat pump cycle
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DOI：
10.1016/j.energy.2008.04.007
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发表时间：
2008-09
期刊：
影响因子：
9
通讯作者：
J. Sarkar
中科院分区：
文献类型：
--
作者：
J. Sarkar
本文采用恒面积混合模型，对喷射器-膨胀式跨临界co2热泵循环进行了常规布置和改进布置的优化研究。在同时冷却和加热应用中，还研究了阀门、涡轮和喷射器膨胀型跨临界二氧化碳热泵循环之间的能量和耗能比较。常规布局的性能表现为最大COP、最佳排放压力以及相应的喷射器夹带比和压升比，而改进布局的性能表现为最大COP、最佳排放压力和相应的压升比。在一定的夹带比、蒸发器和冷却器出口温度组合条件下，可实现改进布局的优化。考虑到系统能量和火用性能之间的权衡，以及与膨胀装置相关的成本，喷射器可能是跨临界co2热泵循环中有前途的替代膨胀装置。
Optimization studies along with optimum parameter correlations, using constant area mixing model are presented in this article for ejector-expansion transcritical CO2heat pump cycle with both conventional and modified layouts. Both the energetic and exergetic comparisons between valve, turbine and ejector-expansions-based transcritical CO2heat pump cycles are also studied for simultaneous cooling and heating applications. Performances for conventional layouts are presented by maximum COP, optimum discharge pressure and corresponding entrainment ratio and pressure lift ratio of ejector, whereas for modified layout by maximum COP, optimum discharge pressure and corresponding pressure lift ratio. The optimization for modified layout can be realized for certain entrainment ratio, evaporator and gas cooler exit temperature combinations. Considering the trade-off between the system energetic and exergetic performances, and cost associated with expansion devices, the ejector may be the promising alternative expansion device for transcritical CO2heat pump cycle.