回热对跨临界CO2喷射制冷系统的影响
The study on the effect of the internal heat exchanger on transcritical CO2 ejector refrigeration system
吴董炯 1胡江 2李杨3
作者信息
- 1. 上海电机学院工业技术中心[创新创业教育中心],上海 201306
- 2. 上海电机学院继续教育学院,上海 201306
- 3. 上海海洋大学食品学院,上海 201306
- 折叠
摘要
目的:研究回热对跨临界CO2双级压缩/喷射制冷系统性能的影响.方法:采用仿真模拟软件建模,分析在不同气体冷却器出口温度(25～45 ℃)、高压侧排气压力(7.4～9.5 MPa)、蒸发温度(-40～-15 ℃)和中间压力(3～5 MPa)的情况下,回热对低压压缩机吸气温度、排气温度、比功率增量以及系统性能系数的影响.结果:在特定的回热度下,随着中间压力的增加,低压压缩机排气温度和比功率增量升高;但随着蒸发温度升高,低压压缩机排气温度和比功率增量逐渐降低.在标准工况下,回热系统的性能系数低于不带回热系统的,同时随着回热度的增加,回热系统的能效降低.结论:随着回热度的增加,低压压缩机吸气温度、排气温度和比功率增量显著升高.但回热改善跨临界CO2双级压缩/喷射制冷系统性能效果不佳.
Abstract
Objective:This study aimed to investigate the effect of internal heat exchanger on the performance of transcritical CO2 two-stage compression/ejector refrigeration system.Methods:The simulation software was used to analyze the effects of the internal heat exchanger on the suction temperature,discharge temperature,specific work increment of the low-pressure compressor and system performance coefficient under different gas cooler outlet temperatures(25～45 ℃),high-pressure side discharge pressure(7.4～9.5 MPa),evaporation temperature(-40～-15 ℃)and intermediate pressure(3～5 MPa).Results:With the increase of intermediate pressure,the discharge temperature and specific work increment of the low-pressure compressor increased at a specific regenerative degree.However,with the increase in evaporation temperature,the discharge temperature and specific work increment of the low-pressure compressor gradually decrease.Under the control of this standard conditions,the coefficient of performance of the regenerative system is lower than that of the system without regenerative,and the energy efficiency of the regenerative system decreases with the increase of the regenerative degree.Conclusion:The suction temperature,discharge temperature,and specific work increment of the low-pressure compressor all rise significantly as the internal heat exchanger increases.However,the internal heat exchanger does not improve the performance of transcritical CO2 two-stage compression/ejector refrigeration system.
关键词
回热器/跨临界/CO2制冷/喷射器/性能系数/低压压缩机Key words
internal heat exchanger/transcritical/CO2 refrigeration/ejector/coefficient of performance/low-pressure compressor引用本文复制引用
基金项目
上海市冷链装备性能与节能评价专业技术服务平台项目(20DZ2292200)
出版年
2024
国家科技期刊平台
NSTL
万方数据