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A simulation study on performance improvement of solar assisted heat pump hot water system by novel controllable crystallization of supercooled PCMs

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  • Kutlu, Cagri
  • Zhang, Yanan
  • Elmer, Theo
  • Su, Yuehong
  • Riffat, Saffa

Abstract

Domestic hot water (DHW) has a significant share in building’s energy consumption. In order to reduce this consumption, various solutions have been proposed such as controlling the system in an efficient way, using renewable sources and using phase change materials (PCM) in the system to increase heat capacity. However, this study is not only offering heat capacity improvement of the DHW storage unit but also proposing that energy efficiency can be improved by controlling the heat releasing time of the PCM. In this study, supercooled PCM tubes are placed in a water tank and charged with a solar assisted heat pump unit, these supercooled PCM tubes can then be discharged anytime when the hot water is required. In this paper, a transient thermodynamic model is built for the whole system including solar collector, heat pump, water tank with PCM and DHW demand profile. System components are modelled and a 24 h of demand profile is used in simulation for a UK home for summer and spring weather conditions. The results show that the PCM tubes effectively compensate the morning peak hot water demand and reduce daily energy consumption around 12.1% and 13.5% by shifting heating provision from immersion heater to solar heat pump.

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  • Kutlu, Cagri & Zhang, Yanan & Elmer, Theo & Su, Yuehong & Riffat, Saffa, 2020. "A simulation study on performance improvement of solar assisted heat pump hot water system by novel controllable crystallization of supercooled PCMs," Renewable Energy, Elsevier, vol. 152(C), pages 601-612.
    • Handle: RePEc:eee:renene:v:152:y:2020:i:c:p:601-612
    DOI: 10.1016/j.renene.2020.01.090
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    5. Rendall, Joseph & Elatar, Ahmed & Nawaz, Kashif & Sun, Jian, 2023. "Medium-temperature phase change material integration in domestic heat pump water heaters for improved thermal energy storage," Renewable and Sustainable Energy Reviews, Elsevier, vol. 185(C).
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    9. Li, Yong & Hu, Bing & Wang, Dengjia & Liu, Hui & Liu, Yanfeng & Haghighat, Fariborz, 2023. "Enhancing the performance of solar water heating systems: Application of double-layer phase change materials," Renewable Energy, Elsevier, vol. 219(P1).
    10. Eneja Osterman & Claudio Del Pero & Eva Zavrl & Fabrizio Leonforte & Niccolò Aste & Uroš Stritih, 2023. "Phase-Change Material Thermal Energy Storage for the Smart Retrofitting of Existing Buildings," Energies, MDPI, vol. 16(17), pages 1-13, August.
    11. Jin, Xin & Zhang, Huihui & Huang, Gongsheng & Lai, Alvin CK., 2021. "Experimental investigation on the dynamic thermal performance of the parallel solar-assisted air-source heat pump latent heat thermal energy storage system," Renewable Energy, Elsevier, vol. 180(C), pages 637-657.
    12. Bulmez, A.M. & Ciofoaia, V. & Năstase, G. & Dragomir, G. & Brezeanu, A.I. & Şerban, A., 2022. "An experimental work on the performance of a solar-assisted ground-coupled heat pump using a horizontal ground heat exchanger," Renewable Energy, Elsevier, vol. 183(C), pages 849-865.
    13. Kutlu, Cagri & Su, Yuehong & Lyu, Qinghua & Riffat, Saffa, 2023. "Thermal management of using crystallization-controllable supercooled PCM in space heating applications for different heating profiles in the UK," Renewable Energy, Elsevier, vol. 206(C), pages 848-857.
    14. Badiei, A. & Golizadeh Akhlaghi, Y. & Zhao, X. & Shittu, S. & Xiao, X. & Li, J. & Fan, Y. & Li, G., 2020. "A chronological review of advances in solar assisted heat pump technology in 21st century," Renewable and Sustainable Energy Reviews, Elsevier, vol. 132(C).

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