Performance Analysis of CO2 Systems Integrated with Ejector and Dedicated Mechanical Subcooling

Dai Baomin; Zhao Ruirui; Liu Shengchun; Qian Jiabao; Xu Tianyahui; Liu Chen; Yang Peifang

doi:10.3969/j.issn.0253-4339.2023.06.069

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Performance Analysis of CO2 Systems Integrated with Ejector and Dedicated Mechanical Subcooling

更新时间：2024-07-18

- Performance Analysis of CO2 Systems Integrated with Ejector and Dedicated Mechanical Subcooling
- Journal of Refrigeration Vol. 44, Issue 6, (2023)
- 作者机构：
  
  天津商业大学天津市制冷技术重点实验室
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0253-4339.2023.06.069
  CLC：
- Published：2023
- 稿件说明：
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Dai Baomin, Zhao Ruirui, Liu Shengchun, et al. Performance Analysis of CO2 Systems Integrated with Ejector and Dedicated Mechanical Subcooling[J]. Journal of refrigeration, 2023, 44(6).
DOI：

Dai Baomin, Zhao Ruirui, Liu Shengchun, et al. Performance Analysis of CO2 Systems Integrated with Ejector and Dedicated Mechanical Subcooling[J]. Journal of refrigeration, 2023, 44(6). DOI： 10.3969/j.issn.0253-4339.2023.06.069.

摘要

为提高CO2系统用于建筑全年空间供热供冷的性能，本文提出集成引射器与机械过冷的跨临界CO2冷热联供系统（EJ-DMS）。通过构建系统的热力学模型，以性能系数（COP）为目标函数，采用遗传算法对排气压力和过冷度进行优化，并对系统应用于5个典型城市的能耗、全年性能系数（COPann）进行场景分析。结果表明：EJ-DMS相比常规机械过冷系统、常规引射系统，COP在制热和制冷模式下分别提高10.90%、5.58%和8.99%、18.12%，COPann分别提高7.95%和5.98%。EJ-DMS相比常规引射系统在制热和制冷模式下排气压力分别降低0.47 MPa和0.77 MPa。此外，EJ-DMS系统在广州和哈尔滨运行时的COPann提升率最大，表明其更适合环境温度较高或较低的地区，如夏热冬暖和严寒地区。本文可为CO2冷热联供系统的构建和优化提供理论参考。

Abstract

A transcritical CO2 system combined with an ejector and dedicated mechanical subcooling (EJ-DMS) was developed to improve the performance of the CO2 system in the space heating and cooling of buildings throughout the year. A thermodynamic model of the system was devised. Then

the discharge pressure and subcooling degree were optimized using a genetic algorithm by considering the coefficient of performance (COP) as the objective function. Using five typical cities as application scenarios

the energy consumption and annual performance factor (COPann) of the system were analyzed. The results show that

compared with a conventional mechanical subcooling system and the conventional ejector system

the heating COP of EJ-DMS is enhanced by 10.90% and 5.58%

respectively

and the cooling COP is increased by 8.99% and 18.12%

respectively. The COPann values are improved by 7.95% and 5.98%

respectively. Compared with the conventional ejector system

the discharge pressure of EJ-DMS is reduced by 0.47 MPa and 0.77 MPa in the heating and cooling modes

respectively. In addition

the COPann improvement ratio of the EJ-DMS system is the highest when operating in Guangzhou and Harbin

indicating that the EJ-DMS system is more suitable for regions with relatively high or low ambient temperatures

such as hot summer and warm winter or severely cold regions. This study provides a theoretical reference for the development and optimization of a combined cooling and heating CO2 system.

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