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Modeling and simulating the transcritical CO2 heat pump system

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  • Yang, Jun Lan
  • Ma, Yi Tai
  • Li, Min Xia
  • Hua, Jun

Abstract

In this paper, a mathematical model for steady-state simulation of transcritical CO2 water-to-water heat pump system with an expander has been developed. It is used to simulate the performance of transcritical CO2 system with CO2 expander prototype. Simulated results are compared with experimental data to verify the accuracy of the simulation model. The comparison results show the average deviation of about 15% for COPc(cooling coefficient of performance) and COPh(heating coefficient of performance), about 17% for cooling and heating capacity at experimental high pressure ranges. With this model, which has been validated in a limited high pressure range, the influence of water mass flow rate and water inlet temperature of both evaporator and gas cooler on the performance of transcritical CO2 expander system is analyzed. The results show that decreasing inlet temperature and increasing mass flow rate of cooling water cannot only increase the system performance but also reduce the optimal heat rejection pressure, at which the maximum COP (coefficient of performance) can be obtained. For chilling water, increasing its inlet temperature and mass flow rate is favorable for increasing the system performance, while the optimal heat rejection pressure does not vary very much.

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  • 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.
    • Handle: RePEc:eee:energy:v:35:y:2010:i:12:p:4812-4818
    DOI: 10.1016/j.energy.2010.09.007
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    References listed on IDEAS

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    1. Yang, Jun Lan & Ma, Yi Tai & Liu, Sheng Chun, 2007. "Performance investigation of transcritical carbon dioxide two-stage compression cycle with expander," Energy, Elsevier, vol. 32(3), pages 237-245.
    2. 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.
    3. 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.
    4. Sarkar, Jahar, 2008. "Optimization of ejector-expansion transcritical CO2 heat pump cycle," Energy, Elsevier, vol. 33(9), pages 1399-1406.
    5. 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.
    6. 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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    5. Dai, Baomin & Liu, Shengchun & Zhu, Kai & Sun, Zhili & Ma, Yitai, 2017. "Thermodynamic performance evaluation of transcritical carbon dioxide refrigeration cycle integrated with thermoelectric subcooler and expander," Energy, Elsevier, vol. 122(C), pages 787-800.
    6. 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.
    7. Zhili, Sun & Minxia, Li & Guangming, Han & Yitai, Ma, 2013. "Performance study of a transcritical carbon dioxide cycle with an expressor," Energy, Elsevier, vol. 60(C), pages 77-86.
    8. Yap, Ken Shaun & Ooi, Kim Tiow & Chakraborty, Anutosh, 2018. "Analysis of the novel cross vane expander-compressor: Mathematical modelling and experimental study," Energy, Elsevier, vol. 145(C), pages 626-637.
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