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Journal of Thermal Science

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2024 , Vol. 33 >Issue 6: 2179 - 2189

DOI: https://doi.org/10.1007/s11630-024-2016-y

Effect of Inter-Stage Pressure on Performances of Two-Stage Transcritical CO2 Refrigeration Cycle with Dedicated Absorption Dual-Subcooling and Mechanical Recooling

  • LI Zeyu ,
  • HUANG Caoxuheng ,
  • YIN Jianhui
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  • 1. School of Electric Power, South China University of Technology, Guangzhou 510640, China
    2. Guangdong Province Key Laboratory of High Efficient and Clean Energy Utilization, South China University of Technology, Guangzhou 510640, China
    3. Guangdong Province Engineering Research Center of High Efficient and Low Pollution Energy Conversion, Guangzhou 510640, China
    4. Ningbo Jetron Technology Co. Ltd., Ningbo 315000, China

网络出版日期: 2024-11-05

基金资助

This work is supported by National Foreign Expert Project under the contract No. G2022163009L, Guangdong Basic and Applied Basic Research Foundation under the contract No. 2023A1515011337, Zhuhai Industry-University-Research Cooperation Project under the contract No. ZH22017001210017PWC, and Key Laboratory of Efficient and Clean Energy Utilization of Guangdong Higher Education Institutes under the contract No. KLB10004.

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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Effect of Inter-Stage Pressure on Performances of Two-Stage Transcritical CO2 Refrigeration Cycle with Dedicated Absorption Dual-Subcooling and Mechanical Recooling

  • LI Zeyu ,
  • HUANG Caoxuheng ,
  • YIN Jianhui
Expand
  • 1. School of Electric Power, South China University of Technology, Guangzhou 510640, China
    2. Guangdong Province Key Laboratory of High Efficient and Clean Energy Utilization, South China University of Technology, Guangzhou 510640, China
    3. Guangdong Province Engineering Research Center of High Efficient and Low Pollution Energy Conversion, Guangzhou 510640, China
    4. Ningbo Jetron Technology Co. Ltd., Ningbo 315000, China

Online published: 2024-11-05

Supported by

This work is supported by National Foreign Expert Project under the contract No. G2022163009L, Guangdong Basic and Applied Basic Research Foundation under the contract No. 2023A1515011337, Zhuhai Industry-University-Research Cooperation Project under the contract No. ZH22017001210017PWC, and Key Laboratory of Efficient and Clean Energy Utilization of Guangdong Higher Education Institutes under the contract No. KLB10004.

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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摘要

本文提出了基于专用吸收式双过冷与机械式再冷的两级二氧化碳跨临界制冷循环。级间压力是循环的主要影响因素，但其作用特性却未被准确揭示。因此，本文旨在探明级间压力对循环效率的影响规律，相应的主要内容包括以下四个方面。首先，通过比较分析展示了新循环的性能优势。其次，探析了不同级间压力下的循环关键温度、热负荷、压缩功耗及性能指标变化规律。再次，通过非线性直接搜索法获得了最佳级间压力的变工况规律。最后，探明了新系统的经济性能。研究结果表明，新循环压缩功耗相较于传统的两级二氧化碳跨临界循环下降了12%，并且专用吸收式过冷子循环的运行温度下限拓展了11°C。此外，最优级间压力对热源温度变化不敏感。本文的主要创新在于探明了级间压力对循环效率的影响特性，获得了最佳级间压力的变工况规律，并指明了系统可行性。本文研究为系统设计与运行优化提供了数据支持。

关键词： CO2 refrigeration; two-stage cycle; dedicated absorption subcooling; recooling; thermodynamics

本文引用格式

LI Zeyu , HUANG Caoxuheng , YIN Jianhui . Effect of Inter-Stage Pressure on Performances of Two-Stage Transcritical CO2 Refrigeration Cycle with Dedicated Absorption Dual-Subcooling and Mechanical Recooling[J]. 热科学学报, 2024 , 33(6) : 2179 -2189 . DOI: 10.1007/s11630-024-2016-y

Abstract

The two-stage transcritical CO2 refrigeration cycle with dedicated dual-subcooling and mechanical recooling is proposed. The inter-stage pressure is critical for such cycle performances; however, it has not been studied exactly. Therefore, the research aim is to disclose the effect of inter-stage pressure on performances of the proposed cycle. The main work consists of four aspects. Firstly, the comparative study is performed to display advantages of the proposed cycle. Secondly, the key temperatures, heat and power consumptions as well as performance indicators for different inter-stage pressures are analyzed in detail, based on the parametric model. Thirdly, the optimal inter-stage pressure for different conditions is obtained by the nonlinear direct search method. Finally, the economic performance is assessed. It is found that the compressor power of the proposed cycle drops by 12%, and the working temperature lower limit is reduced by 11°C. Furthermore, it is considered that the optimal inter-stage pressure is insensitive to the heat source temperature. The novelty lies in illustrating the effect of inter-stage pressure, obtaining trends of the optimal value, and pointing out the system feasibility. The paper is favorable for design and operation optimization of the proposed system.

Key words： CO2 refrigeration; two-stage cycle; dedicated absorption subcooling; recooling; thermodynamics

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