基于超音速两相膨胀器的新型CO_(2)热泵与制冷循环研究  

Study on a New CO_(2) Heat Pump and Refrigeration Cycle Based on Supersonic Two-Phase Expander

作　　者：曾钰培 罗二仓[1,2] 邹爱红 王晓涛 公茂琼[1,2] ZENG Yupei;LUO Ercang;ZOU Aihong;WANG Xiaotao;GONG Maoqiong(Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院理化技术研究所,北京100190 [2]中国科学院大学,北京100049

出　　处：《工程热物理学报》2022年第7期1736-1742,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51976231)。

摘　　要：综合性能优异的自然工质CO_(2)在改善环境问题方面具有重要作用。基于环保安全的CO_(2),采用制冷效率较高、结构简单、无运动部件的超音速两相膨胀器作为膨胀降温装置,构建新型CO_(2)热泵与制冷循环,对新循环进行热力学分析和模拟计算研究。结果显示,理想的热泵循环最大热泵系数COP_(h)为5.83、最大制冷系数COP_(c)为4.90,展现出良好的制热制冷性能;空调温区工况,新型CO_(2)制冷循环COP_(c)为6.69,是现有制冷性能相对最优的CO_(2)跨临界制冷循环COP的1.63倍,且系统运行压力降低,安全性可靠性提高;冰箱温区工况,COP_(c)随STPE入口压力的增大稳定在3.5附近,相对卡诺效率保持在0.78左右。研究表明,基于超音速两相膨胀器的新型CO_(2)热泵与制冷循环具有一定的发展潜力,为CO_(2)利用提供一种可能的参考。As a natural working medium with excellent comprehensive performance,CO_(2) plays an important role in improving environmental problems.Based on environmental protection and safety CO_(2),a new CO_(2) heat pump and refrigeration cycle was constructed by using a supersonic two-phase expander with high cooling efficiency,simple structure and no mechanical moving parts as an expansion and cooling device.The thermodynamic analysis and simulation study of the new cycle were carried out.The results show that the ideal heat pump cycle has a maximum heat pump coefficient COP_(h) of 5.83 and a maximum refrigeration coefficient COP_(c) of 4.90,showing good heating and cooling performance.Under the condition of air conditioning temperature zone,the COP of the new CO_(2) refrigeration cycle is 6.69,which is 1.63 times that of the existing CO_(2) transcritical refrigeration cycle with relatively optimal refrigeration performance.In addition,the operating pressure of the system is greatly reduced,and the safety and reliability are improved.Under the condition of refrigerator temperature zone,COP_(c) is stable around 3.5 with the increase of STPE inlet pressure,and the relative Carnot efficiency is maintained around 0.78.The research shows that the new CO_(2) heat pump and refrigeration cycle based on supersonic two-phase expander have certain development potential,which provide a possible reference for CO_(2) utilization.

关 键 词：自然工质CO_(2) 超音速两相膨胀器 新型热泵与制冷循环 热力学分析 模拟计算 

分 类 号：TB61[一般工业技术—制冷工程]