Use of artificial roughness for performance enhancement of solar air heaters—a review. Issue 7 (28th May 2019)

• Record Type: Journal Article
• Authors: Prakash, Chandra; Saini, R.P.
• Is Part Of: International journal of green energy. Volume 16:Issue 7(2019)
• Page Start: 551
• Page End: 572
• Publication Date: 2019-05-28
• Subjects: Solar air heater -- artificial roughness -- thermal efficiency -- thermo-hydraulic efficiency -- heat-transfer coefficient; Power resources -- Research -- Periodicals; Energy industries -- Periodicals; Energy development -- Periodicals; 333.79
• DOI: 10.1080/15435075.2019.1598418
• Languages: English
• ISSNs: 1543-5075

Abstract

ABSTRACT: The performance characteristics of a solar air heater can effectively be improved by providing artificial roughness in the form of protrusions and dimples of various shapes, sizes, and orientations on the underside of heated surface. An extensive literature review on artificial roughness elements has been carried and the correlations developed for heat transfer and friction factor for roughened solar air collector have been discussed and presented in this paper. The performance parameter has also been computed and compared with various kinds and shapes of roughness geometries using correlations developed by various investigators. The optimum values of the roughness parameters obtained by several investigators have also been discussed.