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Optimization of the heat exchanger in a flat plate indirect heating integrated collector storage solar water heating system

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  • AL-Khaffajy, Marwaan
  • Mossad, Ruth

Abstract

Due to the environmental impact of energy usage, consumers need to be encouraged to use renewable energy sources such as solar energy. The indirect heating flat plate integrated collector storage solar water heating system is one of the compact systems for domestic water heating. It incorporates the collection of a solar energy component and a hot water storage component in one unit. The objectives of this study were to investigate the effect of different parameters on the thermal performance of this system with the aim of reducing both the initial and the running costs. The outlet service water temperature was used as a measure of performance, because it is an indicator of the energy acquired from the solar radiation. The continuity, momentum and energy equations of the fluids involved in the system were numerically solved in a steady state condition, using FLUENT software. Three-D CFD models were developed and validated using previous experimental results. A standard k–ω turbulent model was used in the optimization of the heat exchanger because it produced good agreement with the experimental results. The surface-to-surface radiation model was included. The effect of single and double row heat exchangers with different lengths was investigated. Circular and elliptic cross-section pipes were also examined. Mass flow rates of 500 and 650 L/h were chosen. The results showed that the single row HX of 10.8 m length for both the elliptical and type B tube gave high service water outlet temperature (acceptable for heat exchanger design) and with low pumping power. This resulted in an increase in the thermal efficiency and a significant reduction in both the initial and the operating costs of the system.

Suggested Citation

  • AL-Khaffajy, Marwaan & Mossad, Ruth, 2013. "Optimization of the heat exchanger in a flat plate indirect heating integrated collector storage solar water heating system," Renewable Energy, Elsevier, vol. 57(C), pages 413-421.
    • Handle: RePEc:eee:renene:v:57:y:2013:i:c:p:413-421
    DOI: 10.1016/j.renene.2012.11.033
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    References listed on IDEAS

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    1. Gertzos, K.P. & Caouris, Y.G. & Panidis, Th., 2010. "Optimal design and placement of serpentine heat exchangers for indirect heat withdrawal, inside flat plate integrated collector storage solar water heaters (ICSSWH)," Renewable Energy, Elsevier, vol. 35(8), pages 1741-1750.
    2. Akhtar, N. & Mullick, S.C., 2007. "Computation of glass-cover temperatures and top heat loss coefficient of flat-plate solar collectors with double glazing," Energy, Elsevier, vol. 32(7), pages 1067-1074.
    3. Smyth, M. & Eames, P.C. & Norton, B., 2006. "Integrated collector storage solar water heaters," Renewable and Sustainable Energy Reviews, Elsevier, vol. 10(6), pages 503-538, December.
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    2. Gautam, Abhishek & Chamoli, Sunil & Kumar, Alok & Singh, Satyendra, 2017. "A review on technical improvements, economic feasibility and world scenario of solar water heating system," Renewable and Sustainable Energy Reviews, Elsevier, vol. 68(P1), pages 541-562.
    3. Singh, Ramkishore & Lazarus, Ian J. & Souliotis, Manolis, 2016. "Recent developments in integrated collector storage (ICS) solar water heaters: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 54(C), pages 270-298.
    4. Yanfeng Liu & Tao Li & Yaowen Chen & Dengjia Wang, 2017. "Optimization of Solar Water Heating System under Time and Spatial Partition Heating in Rural Dwellings," Energies, MDPI, vol. 10(10), pages 1-19, October.
    5. Marmoush, Mohamed M. & Rezk, Hegazy & Shehata, Nabila & Henry, Jean & Gomaa, Mohamed R., 2018. "A novel merging Tubular Daylight Device with Solar Water Heater – Experimental study," Renewable Energy, Elsevier, vol. 125(C), pages 947-961.
    6. Ryszard Myhan & Karolina Szturo & Monika Panfil & Zbigniew Szwejkowski, 2020. "The Influence of Weather Conditions on the Optimal Setting of Photovoltaic Thermal Hybrid Solar Collectors—A Case Study," Energies, MDPI, vol. 13(18), pages 1-13, September.

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