Comparative analysis of the thermal efficiency of a flat plate solar collector varying the glass type in the cover
Keywords:
flat plate solar collector, thermal efficiency, incident solar radiation.Abstract
A comparative analysis of the thermal efficiency of flat plate solar collectors for air heating due to incident solar radiation was carried out. Two flat plate solar collectors and conventional cover of dark and clear glass were used, which allowed determining the incidence of incident solar radiation on the air outlet temperature. Experiments were carried out under equal conditions with real-time data collection every minute for six hours a day and four conditions: without forced air, with forced air at 0,033 kg/s, 0,5 kg/s and 0,061 kg/s. The experimentation allowed defining that the application of dark glass decreases the thermal efficiency; the best values are obtained when using clear glass, the outlet temperature obtained reaches average values of 8,26 °C without forced air. The comparative thermal performance between solar collectors with clear and dark glass covers shows values that reach 12 % in clear glass covers, the experimental incident solar radiation values varied between 200 W/m2 and 1 500 W/m2.Downloads
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