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- Title
The Effect of the Angle of Inclination on the Efficiency in a Medium-Temperature Flat Plate Solar Collector.
- Authors
Montoya-Marquez, Orlando; Flores-Prieto, José Jasson
- Abstract
In this experimental work, the effects of the inclination angle β and the (Ti - Ta / G on the efficiency and the UL-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: (To - Ti) 0, and Case 2: (To - Ti) = 0. The inclination angles were 0°-90° and the (Ti - Ta)/G were 0.044-0.083 m² °C/W and 0.124-0.235 for Case 1 and Case 2, respectively. The variations of β and (Ti - Ta)/G cause efficiency changes up to 0.37-0.45 (21.6%) and 0.31-0.45 (45.0%), respectively, for Case 1. Also, then UL (β) reached changes up to 10.1-12.0 W / m²⋅°C (41.7%), respectively, for Case 1. The most significant changes of UL (β) / UL (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 UL value.
- Subjects
SOLAR collectors; SOLAR energy; CALORIMETRY; PID controllers; JOULE
- Publication
Energies (19961073), 2017, Vol 10, Issue 1, p71
- ISSN
1996-1073
- Publication type
Article
- DOI
10.3390/en10010071