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Influence of ambient temperatures on performance of a CO2 heat pump water heating system

Author

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  • Yokoyama, Ryohei
  • Shimizu, Takeshi
  • Ito, Koichi
  • Takemura, Kazuhisa

Abstract

In residential applications, an air-to-water CO2 heat pump is used in combination with a domestic hot water storage tank, and the performance of this system is affected significantly not only by instantaneous ambient air and city water temperatures but also by hourly changes of domestic hot water consumption and temperature distribution in the storage tank. In this paper, the performance of a CO2 heat pump water heating system is analyzed by numerical simulation. A simulation model is created based on thermodynamic equations, and the values of model parameters are estimated based on measured data for existing devices. The calculated performance is compared with the measured one, and the simulation model is validated. The system performance is clarified in consideration of seasonal changes of ambient air and city water temperatures.

Suggested Citation

  • Yokoyama, Ryohei & Shimizu, Takeshi & Ito, Koichi & Takemura, Kazuhisa, 2007. "Influence of ambient temperatures on performance of a CO2 heat pump water heating system," Energy, Elsevier, vol. 32(4), pages 388-398.
    • Handle: RePEc:eee:energy:v:32:y:2007:i:4:p:388-398
    DOI: 10.1016/j.energy.2006.06.020
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    References listed on IDEAS

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    1. Richter, M.R. & Song, S.M. & Yin, J.M. & Kim, M.H. & Bullard, C.W. & Hrnjak, P.S., 2003. "Experimental results of transcritical CO2 heat pump for residential application," Energy, Elsevier, vol. 28(10), pages 1005-1019.
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    Cited by:

    1. Yijiang Zeng & Shengyu Li & Jun Lu & Xiaodong Li & Dingding Xing & Jipan Xiao & Zhanhao Zhang & Leihong Li & Xuhui Shi, 2023. "Research on Energy Savings of an Air-Source Heat Pump Hot Water System in a College Student’s Dormitory Building," Sustainability, MDPI, vol. 15(13), pages 1-24, June.
    2. 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.
    3. Baek, Changhyun & Heo, Jaehyeok & Jung, Jongho & Cho, Honghyun & Kim, Yongchan, 2014. "Performance characteristics of a two-stage CO2 heat pump water heater adopting a sub-cooler vapor injection cycle at various operating conditions," Energy, Elsevier, vol. 77(C), pages 570-578.
    4. Ge, T.S. & Weng, Z.C. & Huang, R. & Hu, B. & Eikevik, Trygve Magne & Dai, Y.J., 2023. "High temperature transcritical CO2 heat pump with optimized tube-in-tube heat exchanger," Energy, Elsevier, vol. 283(C).
    5. Guo, J.J. & Wu, J.Y. & Wang, R.Z. & Li, S., 2011. "Experimental research and operation optimization of an air-source heat pump water heater," Applied Energy, Elsevier, vol. 88(11), pages 4128-4138.
    6. Jia, Jie & Lee, W.L., 2015. "Experimental study of the application of intermittently operated SEHRAC (storage-enhanced heat recovery room air-conditioner) in residential buildings in Hong Kong," Energy, Elsevier, vol. 83(C), pages 628-637.
    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. Yang, Jun Lan & Ma, Yi Tai & Li, Min Xia & Hua, Jun, 2010. "Modeling and simulating the transcritical CO2 heat pump system," Energy, Elsevier, vol. 35(12), pages 4812-4818.
    9. Xu, Xiao Xiao & Chen, Guang Ming & Tang, Li Ming & Zhu, Zhi Jiang, 2012. "Experimental investigation on performance of transcritical CO2 heat pump system with ejector under optimum high-side pressure," Energy, Elsevier, vol. 44(1), pages 870-877.
    10. Jia, Jie & Lee, W.L., 2015. "Experimental investigations on using phase change material for performance improvement of storage-enhanced heat recovery room air-conditioner," Energy, Elsevier, vol. 93(P2), pages 1394-1403.
    11. Shimoda, Yoshiyuki & Okamura, Tomo & Yamaguchi, Yohei & Yamaguchi, Yukio & Taniguchi, Ayako & Morikawa, Takao, 2010. "City-level energy and CO2 reduction effect by introducing new residential water heaters," Energy, Elsevier, vol. 35(12), pages 4880-4891.
    12. 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.
    13. Adria Banks & Colin Grist & Jonathan Heller & Hyunwoo Lim, 2022. "Field Measurement of Central CO 2 Heat Pump Water Heater for Multifamily Retrofit," Sustainability, MDPI, vol. 14(13), pages 1-18, July.
    14. Yokoyama, Ryohei & Wakui, Tetsuya & Kamakari, Junya & Takemura, Kazuhisa, 2010. "Performance analysis of a CO2 heat pump water heating system under a daily change in a standardized demand," Energy, Elsevier, vol. 35(2), pages 718-728.
    15. 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.
    16. Goto, Hisanori & Goto, Mika & Sueyoshi, Toshiyuki, 2011. "Consumer choice on ecologically efficient water heaters: Marketing strategy and policy implications in Japan," Energy Economics, Elsevier, vol. 33(2), pages 195-208, March.
    17. Xu, Yingjie & Mao, Chengbin & Huang, Yuangong & Shen, Xi & Xu, Xiaoxiao & Chen, Guangming, 2021. "Performance evaluation and multi-objective optimization of a low-temperature CO2 heat pump water heater based on artificial neural network and new economic analysis," Energy, Elsevier, vol. 216(C).
    18. Ibrahim, Oussama & Fardoun, Farouk & Younes, Rafic & Louahlia-Gualous, Hasna, 2014. "Air source heat pump water heater: Dynamic modeling, optimal energy management and mini-tubes condensers," Energy, Elsevier, vol. 64(C), pages 1102-1116.

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