带喷射器的低温跨临界CO_(2)两级压缩制冷系统性能  

Performance of Low-temperature Two-stage Transcritical CO_(2) Compression Refrigeration System with Ejector

作　　者：傅兵 张良[1] 叶方平 焦兴蓉 杨玉麒 Fu Bing;Zhang Liang;Ye Fangping;Jiao Xingrong;Yang Yuqi(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai,200093,China;Zhejiang Xinjin Air Conditioning Equipment Co.,Ltd.,Longquan,323700,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]浙江新劲空调设备有限公司,龙泉323700

出　　处：《制冷学报》2024年第4期124-130,共7页Journal of Refrigeration

摘　　要：针对低蒸发温度下跨临界CO_(2)制冷系统实验研究较少的现状,设计搭建了带喷射器的跨临界CO_(2)两级压缩制冷实验台,在蒸发温度为-33~-29℃,气冷器出口温度为30~40℃,高压压力为8.20~9.70 MPa的实验工况下研究制冷系统的性能变化,并将实验结果与理论计算结果进行对比。研究结果表明:实验结果与理论热力学计算结果变化趋势一致,喷射器的应用可显著提升跨临界CO_(2)两级压缩制冷系统的性能,其对制冷系统COP的最大提升率可达29.37%;在实验工况下,带喷射器的跨临界CO_(2)两级压缩制冷系统的最优高压压力为8.80 MPa,对应的最优COP为1.63;带喷射器的跨临界CO_(2)两级压缩制冷系统的制冷量和COP随蒸发温度的升高而增大;气冷器出口温度对制冷系统的性能影响显著,随着气冷器出口温度从30℃升至40℃,制冷系统的COP降低61.4%。这些研究成果可为带喷射器的跨临界CO_(2)两级压缩制冷系统的研究提供参考。Because of the limited experimental studies on transcritical CO_(2) refrigeration systems at low evaporating temperatures,an experimental platform of a two-stage transcritical CO_(2) compression refrigeration system with an ejector was designed and built.We evaluated the performance of the proposed refrigeration system under the following experimental conditions:evaporating temperature within the range of-33℃--29℃,gas cooler outlet temperature of 30℃-40℃,and high pressure of 8.20 MPa-9.70 MPa.The results show that the variation trend of the experimental results is consistent with that of the theoretical thermodynamic calculation results,and the application of the ejector can significantly improve the performance of the two-stage transcritical CO_(2) compression refrigeration system.The maximum increase rate of the coefficient of performance(COP)of the refrigeration system by the ejector is 29.37%.Under experimental conditions,the optimal high pressure of the two-stage transcritical CO_(2) compression refrigeration system with an ejector is 8.80 MPa,and the corresponding optimal COP is 1.63.The cooling capacity and COP of the two-stage transcritical CO_(2) compression refrigeration system with an ejector increase with increasing evaporating temperature,and the gas cooler outlet temperature significantly affected the performance of the refrigeration system.As the gas cooler outlet temperature increases from 30℃to 40℃,the COP of the refrigeration system decreases by 61.4%.The research results provide a reference for research on two-stage transcritical CO_(2) compression refrigeration systems with ejectors.

关 键 词：跨临界两级压缩 喷射器 低蒸发温度 CO_(2) 制冷性能 

分 类 号：TB611[一般工业技术—制冷工程] TB617