Abstract:
In the present work, the heat transfer through a solar thermal collector (STC) provided with jet air impingement on the absorbent
plate fitted with multi V-shaped protrusion ribs is investigated experimentally. The investigation is carried out for geometric
parameters such as Relative width ratio (WPR/WAPR), Relative protrusion rib height (hPR/dPR), Relative pitch ratio (PPR/hPR),
Angle of attack (αPR) respectively. The values of the streamwise pitch ratio (XSW/dh) = 0.40, spanwise pitch ratio (YSW/dh) = 0.85
and jet diameter ratio (dj/dh) = 0.064 are kept constant. The overall performance of STC is effectively evaluated by varying
Reynolds number (Re) in the range 2500–35,000. The results obtained from the experiments shows that the impingement jets
flow on multi V-shaped protrusion ribs absorber plate accelerated the heat transfer through the solar collector channel. The
optimal augmentation is obtained at WPR/WAPR= 5, hPR/dPR= 0.9, PPR/hPR = 8 and αPR = 65° respectively. Thermal-hydraulic
performance parameter ( ηPR) has also been investigated and the maximum value of 3.44 is obtained for the range of parameters
studied.
