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Parametric analysis of a new combined cooling, heating and power system with transcritical CO2 driven by solar energy

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  • Wang, Jiangfeng
  • Zhao, Pan
  • Niu, Xiaoqiang
  • Dai, Yiping

Abstract

In order to utilize renewable energy to meet diverse energy requirements, a new combined cooling, heating and power (CCHP) system is proposed to produce cooling output, heating output and power output simultaneously. This proposed system combines a Brayton cycle and a transcritical CO2 refrigeration cycle with ejector-expansion device, which uses solar energy as the heat source to reduce fossil fuel consumption and alleviate environmental problems. A mathematical model is developed to simulate the new CCHP system with transcritical CO2 driven by solar energy under steady-state conditions, and the thermal efficiency and exergy efficiency are used to evaluate the system performance. The effects of several key thermodynamic parameters on the system performance are examined. The results indicate that increasing turbine inlet pressure and ejector inlet temperature could lower the efficiency of the system, and increasing turbine back pressure and turbine inlet temperature could elevate the efficiency of system. In addition, as ejector back pressure increases, the thermal efficiency of system decreases, but the exergy efficiency increases.

Suggested Citation

  • Wang, Jiangfeng & Zhao, Pan & Niu, Xiaoqiang & Dai, Yiping, 2012. "Parametric analysis of a new combined cooling, heating and power system with transcritical CO2 driven by solar energy," Applied Energy, Elsevier, vol. 94(C), pages 58-64.
    • Handle: RePEc:eee:appene:v:94:y:2012:i:c:p:58-64
    DOI: 10.1016/j.apenergy.2012.01.007
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    References listed on IDEAS

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    1. Wang, Jiangfeng & Dai, Yiping & Gao, Lin & Ma, Shaolin, 2009. "A new combined cooling, heating and power system driven by solar energy," Renewable Energy, Elsevier, vol. 34(12), pages 2780-2788.
    2. Meng, Xiangyu & Yang, Fusheng & Bao, Zewei & Deng, Jianqiang & Serge, Nyallang N. & Zhang, Zaoxiao, 2010. "Theoretical study of a novel solar trigeneration system based on metal hydrides," Applied Energy, Elsevier, vol. 87(6), pages 2050-2061, June.
    3. Sarkar, Jahar, 2008. "Optimization of ejector-expansion transcritical CO2 heat pump cycle," Energy, Elsevier, vol. 33(9), pages 1399-1406.
    4. Zhai, H. & Dai, Y.J. & Wu, J.Y. & Wang, R.Z., 2009. "Energy and exergy analyses on a novel hybrid solar heating, cooling and power generation system for remote areas," Applied Energy, Elsevier, vol. 86(9), pages 1395-1404, September.
    5. Jing, You-Yin & Bai, He & Wang, Jiang-Jiang & Liu, Lei, 2012. "Life cycle assessment of a solar combined cooling heating and power system in different operation strategies," Applied Energy, Elsevier, vol. 92(C), pages 843-853.
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    Keywords

    CCHP; Ejector; Solar energy; CO2;
    All these keywords.

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