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The Effect of the Angle of Inclination on the Efficiency in a Medium-Temperature Flat Plate Solar Collector

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  • Orlando Montoya-Marquez

    (National Center of Research and Develop of Technology-TecNM-SEP, Interior Internado Palmira s/n, Cuernavaca 62490, Morelos, Mexico)

  • José Jasson Flores-Prieto

    (National Center of Research and Develop of Technology-TecNM-SEP, Interior Internado Palmira s/n, Cuernavaca 62490, Morelos, Mexico)

Abstract

In this experimental work, the effects of the inclination angle β and the ( T i − T a )/ G on the efficiency and the U L -value were investigated on a medium-temperature flat plate solar collector. The experiments were based on steady-state energy balance, by heat flow calorimetry at indoor conditions and considering the standard American National Standard Institute/American Society of Heating Refrigerating and Air Conditioning Engineers (ANSI/ASHRAE) 93-2010. The solar radiation was emulated by the Joule effect using a proportional integral derivative (PID) control considering two conditions of the absorber temperature, Case 1: ( T o − T i ) > 0, and Case 2: ( T o − T i ) = 0. The inclination angles were 0°–90° and the ( T i − T a )/ G were 0.044–0.083 m 2 ·°C/W and 0.124–0.235 for Case 1 and Case 2, respectively. The variations of β and ( T i − T a )/ G cause efficiency changes up to 0.37–0.45 (21.6%) and 0.31–0.45 (45.0%), respectively, for Case 1. Also, the U L (β) reached changes up to 10.1–12.0 W/m 2 ·°C (19.2%) and 8.4–12.0 W/m 2 ·°C (41.7%), respectively, for Case 1. The most significant changes of U L (β)/ U L (90°) vs. β were 8.0% at the horizontal position for Case 1, while for Case 2, the maximum change was 1.8% only. Therefore, the changes of the inclination angle cause significant variations of the convective flow patterns within the collector, which leads to considerable variation of the collector efficiency and its U L value.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:1:p:71-:d:87250
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    References listed on IDEAS

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    1. Shariah, Adnan & Al-Akhras, M-Ali & Al-Omari, I.A., 2002. "Optimizing the tilt angle of solar collectors," Renewable Energy, Elsevier, vol. 26(4), pages 587-598.
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    1. Shantia, Alireza & Streicher, Wolfgang & Bales, Chris, 2022. "Effect of tapered headers on pressure drop and flow distribution in a U-type polymeric solar absorber," Renewable Energy, Elsevier, vol. 192(C), pages 550-560.
    2. 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.
    3. Juan Manuel García-Guendulain & José Manuel Riesco-Avila & Francisco Elizalde-Blancas & Juan Manuel Belman-Flores & Juan Serrano-Arellano, 2018. "Numerical Study on the Effect of Distribution Plates in the Manifolds on the Flow Distribution and Thermal Performance of a Flat Plate Solar Collector," Energies, MDPI, vol. 11(5), pages 1-21, April.
    4. Erdoğan Arıkan & Serkan Abbasoğlu & Mustafa Gazi, 2018. "Experimental Performance Analysis of Flat Plate Solar Collectors Using Different Nanofluids," Sustainability, MDPI, vol. 10(6), pages 1-11, May.
    5. Woobin Kang & Yunchan Shin & Honghyun Cho, 2017. "Economic Analysis of Flat-Plate and U-Tube Solar Collectors Using an Al 2 O 3 Nanofluid," Energies, MDPI, vol. 10(11), pages 1-15, November.

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