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首页> 外文期刊>Energy Conversion & Management >The application of thermoelectric and ejector in a CO_2 direct-expansion ground source heat pump; energy and exergy analysis
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The application of thermoelectric and ejector in a CO_2 direct-expansion ground source heat pump; energy and exergy analysis

机译：热电和喷射器在CO_2直膨胀地源热泵中的应用;能量和漏洞分析

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摘要

The thermodynamic analysis of a horizontal CO2 direct-expansion ground source heat pump in transcritical cycle was performed to investigate the influence of using thermoelectric sub-cooler and the ejector on the performance parameters of the cycle. A comparative analysis was conducted between the Base cycle and the cycles with ejector and thermoelectric sub-cooler considering the pressure drops in the gas cooler and the ground heat exchanger. The effects of compressor inlet temperature, soil temperature, thermoelectric sub-cooler length, thermoelectric sub-cooler cooling water mass flow rate, and ground heat exchanger outlet temperature on different performance parameters of the cycles were studied. The results demonstrated that the application of ejector exhibits a more stable operation of the cycle and increasing its COP by 16.5% as compared to the Base cycle considering the same ground heat exchanger length. Also, the length of ground heat exchanger is considerably decreased by using the ejector considering the same COP for the Base and EJR cycles. Besides, thermoelectric sub-cooler decreases the irreversibilities of the cycle by generation more power, thereby COP is boosted by 16% as compared to the Base cycle. Furthermore, the major irreversibility in the cycle with thermoelectric and ejector is occurred in the compressor and followed by ejector, ground heat exchanger, gas cooler, thermoelectric sub-cooler, and the expansion valve, respectively.
机译：进行跨临界周期中水平CO2直膨胀地源热泵的热力学分析，以研究使用热电子冷却器和喷射器对循环性能参数的影响。考虑到气体冷却器和地面热交换器中的压力下降，在基础循环和热电子冷却器之间进行比较分析。研究了压缩机入口温度，土壤温度，热电子冷却器长度，热电子冷却器冷却水质量流量和地面热交换器出口温度对循环不同性能参数的影响。结果表明，与考虑到相同地面热交换器长度的基础循环相比，喷射器的应用表现出更稳定的循环操作并将其COP以16.5％增加。而且，通过使用考虑到基础和EJR循环的相同COP的喷射器，地接地热交换器的长度显着降低。此外，热电子冷却器通过产生更多功率降低循环的不缩探，从而与基本循环相比，COP被升高16％。此外，在压缩机中发生了具有热电和喷射器的循环中的主要不可逆性，然后分别喷射器，地热交换器，气体冷却器，热电子冷却器和膨胀阀。

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