Journal Article10.1007/S10973-021-10852-W
Exergetic performance estimation for roughened triangular duct used in solar air heaters
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TL;DR: In this paper, the effect of different roughness geometries on the exergy efficiency of a solar air heater is investigated, and it is concluded that the exergetic efficiency found in semicircular ribbed SAH is 26% higher than that of square roughness at e/D and p/e value of 0.04 and 10, respectively.
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Abstract: A solar air heater (SAH) is a heat exchanger that is capable of converting radiations (solar) into thermal energy, which is further utilized for heating purposes. But due to poor thermal conductivity of air, SAH has poor thermal performance. Roughness is one of the effective techniques used to improve the performance of SAH. Two different roughness geometries, semicircular and square, were used in the present article, and the effect of different parameters on the exergy efficiency of a SAH is investigated. The flow passage used for the solar air heater has a triangular cross section with an equal side length of 160 mm. The positive impact of various roughness parameters (relative roughness height, e/D and relative roughness pitch, p/e) and operating parameters (Reynolds number) has been obtained on the exergetic efficiency of the SAH. Comparing both the roughness geometries, it is concluded that the exergetic efficiency found in semicircular ribbed SAH is 26% higher than that of square roughness at e/D and p/e value of 0.04 and 10, respectively. The exergetic efficiency of a SAH is suitable for design as it includes the quality of useful energy and its associated pumping power. The design plots are also developed and based upon that recommendations are made to develop an efficient solar air heater.
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References
Experimental investigation on heat-transfer enhancement due to a gap in an inclined continuous rib arrangement in a rectangular duct of solar air heater
TL;DR: In this paper, the authors presented the experimental investigation of heat transfer and friction factor characteristics of a rectangular duct roughened with repeated square cross-section split-rib with a gap, on one broad wall arranged at an inclination with respect to the flow direction.
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Correlations for solar air heater duct with dimpled shape roughness elements on absorber plate
Muneesh Sethi,Varun,N.S. Thakur +2 more
TL;DR: In this article, an experimental investigation has been carried out for a range of system and operating parameters in order to analyse the effect of artificial roughness on heat transfer and friction characteristics in solar air heater duct which is having dimple shaped elements arranged in angular fashion (arc) as roughness elements on absorber plate.
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Heat transfer and friction correlations for artificially roughened solar air heater duct with discrete W-shaped ribs
TL;DR: In this paper, an experimental investigation has been carried out to study the heat transfer and friction characteristics in a solar air heater by using discrete W-shaped roughness on one broad wall of a thermal unit with an aspect ratio of 8:1, the roughened wall being heated while the remaining three walls are insulated.
196
A review of solar air flat plate collector for drying application
TL;DR: In this paper, the fundamental mechanisms and descriptions of solar collectors, which are indispensable components of solar dryers, are presented, and analysis methods typically used for the evaluation of solar collector performance, particularly energy analysis and exergy analysis, are reported.
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Numerical investigation of heat transfer enhancement in a solar air heater roughened by multiple V-shaped ribs
TL;DR: In this paper, the authors investigated the performance of a multiple V-shaped rib roughened solar air heater with different geometrical parameters of the channel and rib, focused on their detailed effects on the maximum heat transfer enhancement.
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