Effect of wind on flow distribution in unglazed transpired-plate collectors

Experimental Study of the Slit Spacing and Bed Height on the Thermal Performance of Slit-Glazed Solar Air Heater

“…A 2D computational fluid dynamic (CFD) study by Gunnewiek et al [22] demonstrated that reverse flow is observed at a mass flow rate of less than 0.0125 kg/s; hence, mass flow rates equal to this and lower should be avoided. Further, the code is modified by considering the effect of wind velocity on the flow distribution of an unglazed transpired plate [23]. The effects of the thickness of the absorber plate, pitch between the holes and diameter of the perforations, were studied by Børvik et al [24].…”

Building Integrated Solar Thermal (BIST) Technologies and Their Applications: A Review of Structural Design and Architectural Integration

“…Solar radiation is not the significant affecting factor for the efficiency of air based solar collectors [53], whilst the airflow distribution and the upward heat loss caused by the ambient wind and the approach velocity have considered closely affecting the operation performance of air-based BIST system. Gunnewiek et al [54] studied the airflow distribution on the face of an unglazed solar thermal collector in a computational fluid dynamics (CFD) model at a constant wind speed of 5 m/s. The wind was found to reinforce the factors producing outflows, and the recommended minimum average suction velocity required to avoid such outflow were given for four operating conditions.…”

Experimental study of wind effects on unglazed transpired collectors

“…This results in the loss of useful heat being carried by the plenum air (Fleck, et al, 2002). Gunnewiek et al (2002), who examined wind effects on the flow distribution in the UTC plenum using CFD simulations, addressed the phenomenon of reverse flow from the plenum. The study confirmed that high wind speeds raise the required suction velocity to maintain inward flow in the absorber and plenum.…”