Augmenting the Efficiency of PVT Solar Air Heater Using DC Blower and Transverse Ribs

Abstract

Solar air heaters (SAHs) are extensively utilized in agricultural drying, food processing industries, etc., In comparison to liquid solar air collectors (LSACs), the thermal efficacy of the solar air collectors (SAC) is very low. Therefore, there is a need to enhance the effectiveness of the SAH. Numerous researchers have proposed various methods to enhance their efficiency. Even though a lot of research has taken place to augment the efficiency of solar air heaters, still it is a thrust area where improvement is required. One of the key areas of improvement for solar air heaters is the use of a blower to cool the air heater. In this regard, this work is focused on improving the efficiency of a solar air heater by using a DC blower and transverse ribs with equal spacing. Experiments were executed at various velocities of the blower. Distinct flow rates of the air considered were 0.864 kg/s and 1.044 kg/s. Solar insolation is measured during the time span of 9 AM to 4 PM. The maximum thermal efficacy of the solar air heater obtained is for solar air heater fitted with the transverse ribs and the efficacy of the solar air collector fitted with transverse ribs provided a maximum efficacy of 42% higher than the classical solar air heater at a flow rate of the air of 1.044 kg/s.