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Performance analysis of hybrid solar-geothermal CO2 heat pump system for residential heating

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  • Kim, Wonseok
  • Choi, Jongmin
  • Cho, Honghyun

Abstract

A simulation study of hybrid solar-geothermal heat pump system for residential applications using carbon dioxide was carried out under different operating conditions. The system consists of a solar unit (concentric evacuated tube solar collector and heat storage tank) and a CO2 heat pump unit (three double-pipe heat exchangers, electric expansion valve, and compressor). As a result, the differential of pressure ratio between the inlet and the outlet of the compressor increases by 19.9%, and the compressor work increases from 4.5 to 5.3 kW when the operating temperature of the heat pump rises from 40 °C to 48 °C. Besides, the pressure ratio of the compressor decreases from 3 to 2.5 when the ground temperature increases from 11 °C to 19 °C. The operating time of the heat pump is reduced by 5 h as the daily solar radiation increases. As the solar radiation increases from 1 to 20 MJ/m2, the collector heat rises by 48% and the maximum collector heat becomes 47.8 kWh. The heating load increases by 70% as the indoor design temperature increases from 18 °C to 26 °C. However, the solar fraction is reduced from 11.4% to 5.8% because of the increases of the heating load.

Suggested Citation

  • Kim, Wonseok & Choi, Jongmin & Cho, Honghyun, 2013. "Performance analysis of hybrid solar-geothermal CO2 heat pump system for residential heating," Renewable Energy, Elsevier, vol. 50(C), pages 596-604.
    • Handle: RePEc:eee:renene:v:50:y:2013:i:c:p:596-604
    DOI: 10.1016/j.renene.2012.07.020
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    References listed on IDEAS

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    4. Chen, J.F. & Dai, Y.J. & Wang, R.Z., 2016. "Experimental and theoretical study on a solar assisted CO2 heat pump for space heating," Renewable Energy, Elsevier, vol. 89(C), pages 295-304.
    5. Girard, Aymeric & Gago, Eulalia Jadraque & Muneer, Tariq & Caceres, Gustavo, 2015. "Higher ground source heat pump COP in a residential building through the use of solar thermal collectors," Renewable Energy, Elsevier, vol. 80(C), pages 26-39.
    6. Sivasakthivel, T. & Murugesan, K. & Sahoo, P.K., 2014. "A study on energy and CO2 saving potential of ground source heat pump system in India," Renewable and Sustainable Energy Reviews, Elsevier, vol. 32(C), pages 278-293.
    7. Moya, Diego & Aldás, Clay & Kaparaju, Prasad, 2018. "Geothermal energy: Power plant technology and direct heat applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 94(C), pages 889-901.
    8. Young-Ju Jung & Hyo-Jun Kim & Bo-Eun Choi & Jae-Hun Jo & Young-Hum Cho, 2016. "A Study on the Efficiency Improvement of Multi-Geothermal Heat Pump Systems in Korea Using Coefficient of Performance," Energies, MDPI, vol. 9(5), pages 1-19, May.
    9. Mohanraj, M. & Belyayev, Ye. & Jayaraj, S. & Kaltayev, A., 2018. "Research and developments on solar assisted compression heat pump systems – A comprehensive review (Part A: Modeling and modifications)," Renewable and Sustainable Energy Reviews, Elsevier, vol. 83(C), pages 90-123.
    10. Evangelos Bellos & Christos Tzivanidis, 2021. "Parametric Investigation of a Ground Source CO 2 Heat Pump for Space Heating," Energies, MDPI, vol. 14(12), pages 1-25, June.
    11. Rajib Uddin Rony & Huojun Yang & Sumathy Krishnan & Jongchul Song, 2019. "Recent Advances in Transcritical CO 2 (R744) Heat Pump System: A Review," Energies, MDPI, vol. 12(3), pages 1-35, January.
    12. Young-Ju Jung & Hyo-Jun Kim & Kyung-Ju Shin & Jae-Hun Jo & Yong-Shik Kim & Young-Hum Cho, 2015. "Development of the Hybrid Operation Method of a Multi-Geothermal Heat Pump System and Absorption Chiller-Heater," Energies, MDPI, vol. 8(9), pages 1-24, August.
    13. Li, Huabin & Tao, Ye & Zhang, Yang & Fu, Hong, 2022. "Two-objective optimization of a hybrid solar-geothermal system with thermal energy storage for power, hydrogen and freshwater production based on transcritical CO2 cycle," Renewable Energy, Elsevier, vol. 183(C), pages 51-66.
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