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Loss coefficients from solar flat-plate collectors

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  • Garg, H.P.
  • Rani, U.

Abstract

In this paper an expression for the accurate computation of the overall heat loss coefficient, UL--including front, edge and rear losses--from a solar flat-plate collector has been derived. This expression is used and values of overall heat loss coefficients and overall collector efficiencies have been computed for various plate temperatures, tp, of 50 to 130°C in steps of 10°C, for ambient temperatures, ta, of zero to 50°C in steps of 10°C for the number of glass covers, N, of zero, 1 and 2 for tilts of the collector from the horizontal, B, of zero, 30° and 45°, for plates with emittances, Ep, of between 0·1 and 0·95, for plates with absorptivities of 0·7, 0·8, 0·9 or 0·95, for solar intensities, H, of 150 to 900 W/m2 and for wind speeds, w, of 1·5, 2·5, 4·0 and 5·5 m/s. Graphs are plotted to show the effects of the absorptivity and emissivity of the cover plate, the number of layers of cover glass, wind speed, tilt of the collector, ambient temperature and solar radiation on collector performance.

Suggested Citation

  • Garg, H.P. & Rani, U., 1980. "Loss coefficients from solar flat-plate collectors," Applied Energy, Elsevier, vol. 7(1-3), pages 109-117, November.
  • Handle: RePEc:eee:appene:v:7:y:1980:i:1-3:p:109-117
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    Cited by:

    1. Fernando del Ama Gonzalo & Belén Moreno Santamaría & Juan A. Hernández Ramos, 2022. "Assessment of Water Flow Glazing as Building-Integrated Solar Thermal Collector," Sustainability, MDPI, vol. 15(1), pages 1-21, December.
    2. Ndukwu, Macmanus Chinenye & Akpan, Godwin & Okeahialam, Azubuike N. & Umoh, John D. & Ubuoh, Emmanuel A. & Benjamine, Uchechukwu G. & Nwachukwu, Chris & Kalu, Confidence A. & Mbanasor, Jude & Wu, Hong, 2023. "A comparison of the drying kinetics, energy consumption and colour quality of drying medicinal leaves in direct-solar dryer with different colours of collector cover," Renewable Energy, Elsevier, vol. 216(C).
    3. 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.

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