Influence of irradiance and irradiation on characteristic parameters for a solar air collector prototype

• Published in: Solar energy 2018-04, Vol.164, p.224-230
• Main Authors: Leśny, Jacek, Panfil, Monika, Urbaniak, Marek
• Format: Article
• Language: English
• Subjects: Air temperature; Ambient temperature; Efficiency; Energy efficiency; Heat loss; Irradiance; Irradiation; Parameters; Prototypes; Radiation; Reliability analysis; Solar energy; Solar-air collector; Temperature effects; Velocity; Vertical orientation
• ISSN: 0038-092X; 1471-1257
• DOI: 10.1016/j.solener.2018.02.047

•The solar-air collector is suited for ventilation and light heating of interiors. It is equipped with a photovoltaicpanel to drive the fan.•High irradiance values on thevertical surface justifies the simple installation.•The maximum efficiency runs at 50%,it is ideal for use from late autumn till spring. The research had the following objectives: to assess the efficiency of a collector and the reliability of the applied parameters such as the outlet air velocity, temperature increase depending on the intensity of solar irradiance, the influence of ambient temperature on the collector’s efficiency and heat loss. The solar-air collector (1180 mm × 610 mm × 77 mm (height, width, depth)) was installed vertically on a South-faced wall and exposed to solar irradiance. The following parameters were measured in the course of study: intensity of solar irradiance falling on a vertical surface (the collector was installed in a vertical position according with the producer design), temperature and velocity of air flowing into the collector as well as the temperature and velocity of air flowing out of the device. The study indicates that the collector worked efficiently at an irradiance value of just 100 W·m−2 and heated up the flowing air by about 5 °C. This temperature increased together with increasing irradiance and reached the value of 20 °C at the irradiance value of 800 W·m−2. The analysis of the collector’s efficiency showed that during its work (proper temperature and irradiance) the efficiency remained at a satisfactory level from 42 to 46%.