代宝民,刘圣春,潘红蕊,孙志利,杨茜茹,马一太
Dai Baomin,Liu Shengchun,Pan Hongrui,Sun Zhili,Yang Qianru,Ma Yitai

• 1:天津市制冷技术重点实验室天津商业大学机械工程学院
• 2:天津海关工业产品安全技术中心
• 3:天津大学热能研究所

摘要(Abstract)：

提出了热电过冷器-膨胀机耦合CO_2跨临界制冷循环(TES+EXP),可实现热电过冷器、膨胀机和压缩机之间的电能平衡分配。对新构型各部件及循环整体的不可逆损失及?效率进行了详细分析,并与三种构型CO_2跨临界循环进行了对比。结果表明TES+EXP循环的?效率明显高于热电过冷(TES)循环,在过冷度为10℃时,?效率提高7.4%。排气压力和过冷度是影响TES+EXP循环单位制冷量不可逆损失iTot的关键因素,循环在最优排气压力和过冷度时存在最小iTot,在标准工况下,TES+EXP循环相对传统CO_2跨临界制冷循环,最小iTot降低了39.9%;气冷器出口温度为46℃时,最优高压减小了2.0 MPa。推荐新型循环应用于气候炎热地区。
A novel CO_2 transcritical refrigeration cycle(TES+EXP) was proposed,which can achieve electric energy balance distribution between the thermoelectric subcooler,the expander and the compressor. The irreversible loss and exergy efficiency of each component and the overall TES+EXP cycle of the new configuration were analyzed in detail and compared with other three configurations of CO_2 transcritical cycles. The results show that the exergy efficiency of TES+EXP cycle was substantially higher than that of the thermoelectric subcooling cycle(TES),which was improved by 7.4% at subcooling degree of 10 ℃.The exhaust pressure and subcooling degree are two key parameters affecting the irreversible loss per unit cooling capacity(iTot) of TES+EXP cycle.There exists a minimum iTot at the optimum exhaust pressure and subcooling degree. The minimum iTot was reduced by39.9% for TES+EXP cycle compared with traditional CO_2 cycle.Moreover,the optimum exhaust pressure was reduced by 2.0 MPa at 46 ℃ outlet temperature of the gas cooler. It is recommended that the new cycle is applied in the hot regions.

关键词(KeyWords)： 跨临界CO_2;制冷循环;热电过冷;膨胀机;?分析
transcritical CO_2;refrigerating cycle;thermoelectric subcooling;expander;exergy analysis

Abstract:

Keywords:

基金项目(Foundation): 天津市高等学校自然科学研究项目(160018)

作者(Author): 代宝民,刘圣春,潘红蕊,孙志利,杨茜茹,马一太
Dai Baomin,Liu Shengchun,Pan Hongrui,Sun Zhili,Yang Qianru,Ma Yitai

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