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Thermal performance analysis of a direct-expansion solar-assisted heat pump water heater

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  • Kong, X.Q.
  • Zhang, D.
  • Li, Y.
  • Yang, Q.M.

Abstract

A direct-expansion solar-assisted heat pump water heater (DX-SAHPWH) is described, which can supply hot water for domestic use during the whole year. The system mainly employs a bare flat-plate collector/evaporator with a surface area of 4.2 m2, an electrical rotary-type hermetic compressor, a hot water tank with the volume of 150 L and a thermostatic expansion valve. R-22 is used as working fluid in the system. A simulation model based on lumped and distributed parameter approach is developed to predict the thermal performance of the system. Given the structure parameters, meteorological parameters, time step and final water temperature, the numerical model can output operational parameters, such as heat capacity, system COP and collector efficiency. Comparisons between the simulation results and the experimental measurements show that the model is able to give satisfactory predictions. The effect of various parameters, including solar radiation, ambient temperature, wind speed and compressor speed, has been analyzed on the thermal performance of the system.

Suggested Citation

  • Kong, X.Q. & Zhang, D. & Li, Y. & Yang, Q.M., 2011. "Thermal performance analysis of a direct-expansion solar-assisted heat pump water heater," Energy, Elsevier, vol. 36(12), pages 6830-6838.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:12:p:6830-6838
    DOI: 10.1016/j.energy.2011.10.013
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    References listed on IDEAS

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    2. Shi, Guo-Hua & Aye, Lu & Li, Dan & Du, Xian-Jun, 2019. "Recent advances in direct expansion solar assisted heat pump systems: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 109(C), pages 349-366.
    3. Mohamed, Elamin & Riffat, Saffa & Omer, Siddig & Zeinelabdein, Rami, 2019. "A comprehensive investigation of using mutual air and water heating in multi-functional DX-SAMHP for moderate cold climate," Renewable Energy, Elsevier, vol. 130(C), pages 582-600.
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    5. Moreno-Rodriguez, A. & Garcia-Hernando, N. & González-Gil, A. & Izquierdo, M., 2013. "Experimental validation of a theoretical model for a direct-expansion solar-assisted heat pump applied to heating," Energy, Elsevier, vol. 60(C), pages 242-253.
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    7. Moreno-Rodríguez, A. & González-Gil, A. & Izquierdo, M. & Garcia-Hernando, N., 2012. "Theoretical model and experimental validation of a direct-expansion solar assisted heat pump for domestic hot water applications," Energy, Elsevier, vol. 45(1), pages 704-715.
    8. Zhang, Lipeng & Xia, Jianjun & Thorsen, Jan Eric & Gudmundsson, Oddgeir & Li, Hongwei & Svendsen, Svend, 2016. "Technical, economic and environmental investigation of using district heating to prepare domestic hot water in Chinese multi-storey buildings," Energy, Elsevier, vol. 116(P1), pages 281-292.
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    10. Mohanraj, M. & Belyayev, Ye. & Jayaraj, S. & Kaltayev, A., 2018. "Research and developments on solar assisted compression heat pump systems – A comprehensive review (Part-B: Applications)," Renewable and Sustainable Energy Reviews, Elsevier, vol. 83(C), pages 124-155.
    11. Li, Danny H.W. & Yang, Liu & Lam, Joseph C., 2013. "Zero energy buildings and sustainable development implications – A review," Energy, Elsevier, vol. 54(C), pages 1-10.
    12. Stephen Tangwe & Patrick Mukumba & Golden Makaka, 2023. "An Installed Hybrid Direct Expansion Solar Assisted Heat Pump Water Heater to Monitor and Modeled the Energy Factor of a University Students’ Accommodation," Energies, MDPI, vol. 16(3), pages 1-30, January.
    13. Kong, Xiangqiang & Jiang, Kailin & Dong, Shandong & Li, Ying & Li, Jianbo, 2018. "Control strategy and experimental analysis of a direct-expansion solar-assisted heat pump water heater with R134a," Energy, Elsevier, vol. 145(C), pages 17-24.
    14. Omojaro, Peter & Breitkopf, Cornelia, 2013. "Direct expansion solar assisted heat pumps: A review of applications and recent research," Renewable and Sustainable Energy Reviews, Elsevier, vol. 22(C), pages 33-45.
    15. Mehrpooya, Mehdi & Moftakhari Sharifzadeh, Mohammad Mehdi & Rosen, Marc A., 2015. "Optimum design and exergy analysis of a novel cryogenic air separation process with LNG (liquefied natural gas) cold energy utilization," Energy, Elsevier, vol. 90(P2), pages 2047-2069.
    16. Li, Fenglei & Chang, Zhao & Li, Xinchang & Tian, Qi, 2018. "Energy and exergy analyses of a solar-driven ejector-cascade heat pump cycle," Energy, Elsevier, vol. 165(PB), pages 419-431.
    17. Khorasaninejad, Ehsan & Hajabdollahi, Hassan, 2014. "Thermo-economic and environmental optimization of solar assisted heat pump by using multi-objective particle swam algorithm," Energy, Elsevier, vol. 72(C), pages 680-690.
    18. Zhang, Jing & Zhang, Hong-Hu & He, Ya-Ling & Tao, Wen-Quan, 2016. "A comprehensive review on advances and applications of industrial heat pumps based on the practices in China," Applied Energy, Elsevier, vol. 178(C), pages 800-825.
    19. Buker, Mahmut Sami & Riffat, Saffa B., 2016. "Solar assisted heat pump systems for low temperature water heating applications: A systematic review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 55(C), pages 399-413.
    20. Leonzio, Grazia, 2017. "Solar systems integrated with absorption heat pumps and thermal energy storages: state of art," Renewable and Sustainable Energy Reviews, Elsevier, vol. 70(C), pages 492-505.
    21. 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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