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Heat rejection pressure optimization for a carbon dioxide split system: An experimental study

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  • Aprea, Ciro
  • Maiorino, Angelo

Abstract

Recent studies indicate carbon dioxide (R744) as a valid alternative to classical substances such as HFCs used in vapour compression plants. However a transcritical refrigeration cycle is needed because the critical temperature of carbon dioxide is usually near the ambient temperature. Consequently the carbon dioxide refrigerator performances are significantly influenced by the heat rejection pressure. In this paper an experimental investigation on working optimization for a "split-system" to cool air in residential applications is presented: by varying the heat rejection pressure an optimum working condition has been found at different ambient temperatures. Furthermore a simplified model to predict the optimum heat rejection pressure is shown and a comparison with experimental results is carried out. Both the model validation and the experimental results suggest that the heat rejection pressure optimization is an convenient method to improve the performance of a carbon dioxide split system. Finally an algorithm based on the aforementioned model has been proposed in order to control an electronic back pressure valve by means of a PLC.

Suggested Citation

  • Aprea, Ciro & Maiorino, Angelo, 2009. "Heat rejection pressure optimization for a carbon dioxide split system: An experimental study," Applied Energy, Elsevier, vol. 86(11), pages 2373-2380, November.
    • Handle: RePEc:eee:appene:v:86:y:2009:i:11:p:2373-2380
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    References listed on IDEAS

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    1. Yang, Jun Lan & Ma, Yi Tai & Li, Min Xia & Guan, Hai Qing, 2005. "Exergy analysis of transcritical carbon dioxide refrigeration cycle with an expander," Energy, Elsevier, vol. 30(7), pages 1162-1175.
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    Cited by:

    1. Hu, Bin & Li, Yaoyu & Cao, Feng & Xing, Ziwen, 2015. "Extremum seeking control of COP optimization for air-source transcritical CO2 heat pump water heater system," Applied Energy, Elsevier, vol. 147(C), pages 361-372.
    2. Alphonsus, Ephrem Ryan & Abdullah, Mohammad Omar, 2016. "A review on the applications of programmable logic controllers (PLCs)," Renewable and Sustainable Energy Reviews, Elsevier, vol. 60(C), pages 1185-1205.
    3. Austin, Brian T. & Sumathy, K., 2011. "Transcritical carbon dioxide heat pump systems: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(8), pages 4013-4029.
    4. Zhongkai Wu & Feifei Bi & Jiyou Fei & Zecan Zheng & Yulong Song & Feng Cao, 2023. "The Collaborative Optimization of the Discharge Pressure and Heat Recovery Rate in a Transcritical CO 2 Heat Pump Used in Extremely Low Temperature Environment," Energies, MDPI, vol. 16(4), pages 1-16, February.
    5. Yu, Binbin & Yang, Jingye & Wang, Dandong & Shi, Junye & Chen, Jiangping, 2019. "An updated review of recent advances on modified technologies in transcritical CO2 refrigeration cycle," Energy, Elsevier, vol. 189(C).
    6. Aprea, C. & Greco, A. & Maiorino, A., 2012. "An experimental evaluation of the greenhouse effect in the substitution of R134a with CO2," Energy, Elsevier, vol. 45(1), pages 753-761.
    7. Ohkura, Masashi & Yokoyama, Ryohei & Nakamata, Takuya & Wakui, Tetsuya, 2015. "Numerical analysis on performance enhancement of a CO2 heat pump water heating system by extracting tepid water," Energy, Elsevier, vol. 87(C), pages 435-447.
    8. Chung, Hyun Joon & Baek, Changhyun & Kang, Hoon & Kim, Dongwoo & Kim, Yongchan, 2018. "Performance evaluation of a gas injection CO2 heat pump according to operating parameters in extreme heating and cooling conditions," Energy, Elsevier, vol. 154(C), pages 337-345.
    9. Aprea, Ciro & Maiorino, Angelo & Mastrullo, Rita, 2011. "Change in energy performance as a result of a R422D retrofit: An experimental analysis for a vapor compression refrigeration plant for a walk-in cooler," Applied Energy, Elsevier, vol. 88(12), pages 4742-4748.
    10. Wang, Wenyi & Zhao, Zhongfan & Zhou, Qun & Qiao, Yiyuan & Cao, Feng, 2021. "Model predictive control for the operation of a transcritical CO2 air source heat pump water heater," Applied Energy, Elsevier, vol. 300(C).
    11. Yu, Binbin & Yang, Jingye & Wang, Dandong & Shi, Junye & Guo, Zhikai & Chen, Jiangping, 2019. "Experimental energetic analysis of CO2/R41 blends in automobile air-conditioning and heat pump systems," Applied Energy, Elsevier, vol. 239(C), pages 1142-1153.
    12. Hongzeng Ji & Jinchen Pei & Jingyang Cai & Chen Ding & Fen Guo & Yichun Wang, 2023. "Review of Recent Advances in Transcritical CO 2 Heat Pump and Refrigeration Cycles and Their Development in the Vehicle Field," Energies, MDPI, vol. 16(10), pages 1-21, May.

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