Paper Details

One of the most efficient ways to improve efficiency of a solar air heater is by using artificial roughness under theabsorber plate of duct. Roughness in the form of multiple arc having gap is a simple and easy process of enhancing heattransfer rate in an air heater. In this research paper the duct was roughened by multiple arc having gap under the absorbingplate. The experimental data was analysed on the basis of various parameters like temperature and radiation. The setup wasinclined at 23˚C in accordance with geographical feature of the place where experiment was done. The angle of attack (α)was 60˚ and Reynolds number was 9000. Under the same environmental condition performance was analysed for smooth andartificially roughened duct. The reading was observed between 9:30 am to 7:00 pm. The maximum temperature differencebetween outlet air temperature of roughened surface and smooth surface was recorded as 9ºC at 5:00 pm. The maximumradiation was 1072 W/m2, maximum ambient temperature, inlet temperature, duct temperature, oil temperature and outlettemperature was recorded as 45, 53, 64, 92 and 76ºC, respectively for the roughened surface. The maximum values of inlettemperature, duct temperature and outlet temperature of smooth surface was 53, 73 and 86ºC, respectively. Due to the use ofan oil box in MH the system was heated up by 2.5 hours extra after fall in solar radiation.

Jay Kumar Sharma, Rajiv Varshney, “Performance analysis of a solar air heater having multiple arc with gap type artificial roughness and thermal storage”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 4, Issue 6, pp. 480-486, June 2017.