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

Orlando Montoya-Marquez and José Jasson Flores-Prieto
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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

Energies, 2017, vol. 10, issue 1, 1-11

Abstract: In this experimental work, the effects of the inclination angle ? 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 ? 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 (?) 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 (?)/ U L (90°) vs. ? 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.

Keywords: covered solar collectors; tilt solar collector; inclined solar collector; overall heat loss coefficient (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
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Citations: View citations in EconPapers (5)

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