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Heat Removal Factor in Flat Plate Solar Collectors: Indoor Test Method

Author

Listed:
  • Orlando Montoya-Márquez

    (Facultad de Ingeniería, Universidad Panamericana, Prolongación Calzada Circunvalación Poniente 49, Zapopan 45010, Mexico)

  • José Jassón Flores-Prieto

    (Tecnológico Nacional de México—CENIDET. Int. Internado Palmira s/n, Cuernavaca 62490, Mexico)

Abstract

This paper presents a couple of methods to evaluate the heat removal factor F R of flat plate solar collectors, as well as a parametric study of the F R against the tilt angle β , and ( T i − T a )/ G , and its effects on the a 0 -factor ( F R τα ) and the a 1 -factor ( F R U Lmin ). The proposed methods were based on indoor flow calorimetry. The first method considers the ratio of the actual useful heat to the maximum useful heat. The second takes into account the slopes of the family of efficiency curves ( F R U Lmin ) according to ANSI/ASHRAE 93-2010, and the minimum overall heat loss coefficient, U Lmin . In both methods, a feedback temperature control at collector inclinations from horizontal to vertical allows the inlet temperature and the emulating of the solar radiation to be established by electrical heating. The performance of the methods was determined in terms of the uncertainty of the F R . Method 1 allowed a three-fold improved precision compared to Method 2; however, this implied a more detailed experimental setup. According to the first method, the effects of the tilt angle β , and the ( Ti − Ta )/ G , on the a 0 -factor were considerable, since F R is directly proportional to the a 0 -factor. The changes in ( Ti − Ta )/ G caused an average change in F R of 32% The F R shows almost linear behavior for inclinations from horizontal to vertical with a 14.5% change. The effects of β on the a 1 -factor were not considerable, due to the compensation between the increase in F R and the decrease in U Lmin as β increased.

Suggested Citation

  • Orlando Montoya-Márquez & José Jassón Flores-Prieto, 2018. "Heat Removal Factor in Flat Plate Solar Collectors: Indoor Test Method," Energies, MDPI, vol. 11(10), pages 1-12, October.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:10:p:2783-:d:176171
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    References listed on IDEAS

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    1. Orlando Montoya-Marquez & José Jasson Flores-Prieto, 2017. "The Effect of the Angle of Inclination on the Efficiency in a Medium-Temperature Flat Plate Solar Collector," Energies, MDPI, vol. 10(1), pages 1-11, January.
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    Cited by:

    1. Minjung Lee & Yunchan Shin & Honghyun Cho, 2020. "Performance Evaluation of Flat Plate and Vacuum Tube Solar Collectors by Applying a MWCNT/Fe 3 O 4 Binary Nanofluid," Energies, MDPI, vol. 13(7), pages 1-17, April.
    2. Francisco Álvarez-Sánchez & Jassón Flores-Prieto & Octavio García-Valladares, 2021. "Annual Thermal Performance of an Industrial Hybrid Direct–Indirect Solar Air Heating System for Drying Applications in Morelos-México," Energies, MDPI, vol. 14(17), pages 1-20, August.
    3. Zakariya Kaneesamkandi & Abdulaziz Almujahid & Basharat Salim, 2022. "Selection of an Appropriate Solar Thermal Technology for Solar Vapor Absorption Cooling—An MADM Approach," Energies, MDPI, vol. 15(5), pages 1-25, March.

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