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Computation of glass-cover temperatures and top heat loss coefficient of flat-plate solar collectors with double glazing

Author

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  • Akhtar, N.
  • Mullick, S.C.

Abstract

A set of correlations for computing the glass-cover temperatures of flat-plate solar collectors with double glazing is developed. A semi-analytical correlation for the factor f2—the ratio of outer to inner thermal resistance of a double-glazed collector—as a function of collector parameters and atmospheric variables is obtained by regression analysis. This relation readily provides the temperature of the second (outer) glass cover (T2). For estimating the temperature of first (inner) glass cover (T1), another relation for the factor f1—the ratio of thermal resistance between the two glass covers to the thermal resistance between the absorber plate and first glass cover—is developed. A wide range of variables is covered in the present analysis. The results are compared with those obtained by numerical solutions of heat-balance equations. Using the proposed relations of glass-cover temperatures, the values of top heat loss coefficient (Ut) can be computed and are found to be very close to those obtained by numerical solutions of heat-balance equations. The maximum absolute error in the calculation of Ut by the proposed method is only 1.0%, so numerical solutions of heat-balance equations for the computation of Ut are not required.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:32:y:2007:i:7:p:1067-1074
    DOI: 10.1016/j.energy.2006.07.007
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    Cited by:

    1. Parupudi, Ranga Vihari & Singh, Harjit & Kolokotroni, Maria, 2020. "Low Concentrating Photovoltaics (LCPV) for buildings and their performance analyses," Applied Energy, Elsevier, vol. 279(C).
    2. Al-Nimr, Moh’d A. & Al-Ammari, Wahib A., 2020. "A novel hybrid and interactive solar system consists of Stirling engine ̸vacuum evaporator ̸thermoelectric cooler for electricity generation and water distillation," Renewable Energy, Elsevier, vol. 153(C), pages 1053-1066.
    3. Dagdougui, Hanane & Ouammi, Ahmed & Robba, Michela & Sacile, Roberto, 2011. "Thermal analysis and performance optimization of a solar water heater flat plate collector: Application to Tétouan (Morocco)," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(1), pages 630-638, January.
    4. Farhadi, Rouhollah & Taki, Morteza, 2020. "The energy gain reduction due to shadow inside a flat-plate solar collector," Renewable Energy, Elsevier, vol. 147(P1), pages 730-740.
    5. Al-Nimr, M.A. & Al-Darawsheh, I.A. & AL-Khalayleh, L.A., 2018. "A novel hybrid cavity solar thermal collector," Renewable Energy, Elsevier, vol. 115(C), pages 299-307.
    6. 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.
    7. Mahavar, S. & Rajawat, P. & Marwal, V.K. & Punia, R.C. & Dashora, P., 2013. "Modeling and on-field testing of a Solar Rice Cooker," Energy, Elsevier, vol. 49(C), pages 404-412.
    8. Jeffrey Kuo, Chung-Feng & Su, Te-Li & Jhang, Po-Ruei & Huang, Chao-Yang & Chiu, Chin-Hsun, 2011. "Using the Taguchi method and grey relational analysis to optimize the flat-plate collector process with multiple quality characteristics in solar energy collector manufacturing," Energy, Elsevier, vol. 36(5), pages 3554-3562.
    9. Shukla, Ruchi & Sumathy, K. & Erickson, Phillip & Gong, Jiawei, 2013. "Recent advances in the solar water heating systems: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 19(C), pages 173-190.
    10. Marion, Michaël & Voicu, Ionut & Tiffonnet, Anne-Lise, 2012. "Study and optimization of a solar subcritical organic Rankine cycle," Renewable Energy, Elsevier, vol. 48(C), pages 100-109.
    11. Subiantoro, Alison & Ooi, Kim Tiow, 2013. "Analytical models for the computation and optimization of single and double glazing flat plate solar collectors with normal and small air gap spacing," Applied Energy, Elsevier, vol. 104(C), pages 392-399.
    12. Del Col, Davide & Padovan, Andrea & Bortolato, Matteo & Dai Prè, Marco & Zambolin, Enrico, 2013. "Thermal performance of flat plate solar collectors with sheet-and-tube and roll-bond absorbers," Energy, Elsevier, vol. 58(C), pages 258-269.
    13. 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.
    14. Alvarez, A. & Cabeza, O. & Muñiz, M.C. & Varela, L.M., 2010. "Experimental and numerical investigation of a flat-plate solar collector," Energy, Elsevier, vol. 35(9), pages 3707-3716.

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