Performance Improvement of Solar Air Heater Using Jet Impingement Cooling: An Experimental Study

Computational Analysis of Bulb-Shape Ribs Roughened Absorber Plate of Solar Air Heater

“…Quantitative and qualitative thermo-hydrodynamics analysis was presented in this section. Figure 4 shows the qualitative and quantitative comparison of velocity, temperature, and pressure contours for proposed geometry (bulb-shaped ribs) with respect to other shapes (Smooth, V-ribs and rectangular-ribs surfaces) at Re of 1.5×10 4 . Figure 4(a) shows the velocity contour for smooth duct, V-ribs, rectangular ribs and bulb-shaped ribs.…”

“…However, atmospheric air temperature was specified at inlet the. The velocity in this simulation varied from 4.2 m/s to 6.5 m/s, according to range of Reynolds numbers (3.0×10 4 to 1.5×10 4 ).…”

“…To avoid numerical errors through the boundary, Fine meshes were generated close to the surfaces and element size varies with 1.2 ratio from surface to center of the duct. For the optimize the number of elements in the domain, simulations were carried out for different number of grid elements bulb-shaped ribbed solar air-heater (α=P/e =10, β= 0.045) at Re of 1.5×10 4 . Figure 3 shows that insignificant change in friction factor (f)…”

“…A solar air heater (SAH) is very common renewable energy heating system in space heat unit and drying unit of agricultural products [1][2][3]. A typical solar heater is a rectangular duct consisting of glass plates for trapping solar rays and an absorber plate for absorbing heat from the incident radiation [4][5][6]. However, the back plate and side walls confined the fluid and provided insulation against heat loss.…”