In this study, thermal and thermohydraulic efficiencies of a solar air heater having roughned absorber plate by V-ribs are numericaly evaluated and the effects of the different roughness parameters on the thermal and thermohydraulic efficiencies are investigated. It is observed that increasing roughness parameters continuesly increases the thermal and thermohudraulic efficiencies; however thermal and thermohydraulic efficiencies decrease after certain point for relative roughnes pitch, relative roughness width and angle of ribs. Optimum points for these parameters are calculated as RRP=8, RRW=6 ve α=60o. In addition to that thermal efficiency is enhanced by 65%~165% and thermohydraulic efficiency is enhanced by 67%~165% for different Reynolds number by using V-rib roughned absorner plate compared to flat plate.
Primary Language | Turkish |
---|---|
Journal Section | Articles |
Authors | |
Publication Date | March 31, 2019 |
Published in Issue | Year 2019 Volume: 34 Issue: 1 |