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强化传热期刊
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ISSN 打印: 1065-5131
ISSN 在线: 1026-5511

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.2017015624
pages 47-89

A REVIEW OF THE THERMAL AND HYDRODYNAMIC PERFORMANCE OF SOLAR AIR HEATER WITH ROUGHENED ABSORBER PLATES

Mukesh Kumar Sahu
Mechanical Engineering Department, National Institute of Technology, Jamshedpur, 831014, Jharkhand, India
Radha Krishna Prasad
Mechanical Engineering Department, National Institute of Technology, Jamshedpur, 831014, Jharkhand, India

ABSTRACT

Employing artificial roughness on the air flow side of an absorber plate in a solar air heater duct is an effective technique used to increase the heat transfer coefficient, which results in enhancement of the thermal performance of the solar air heater. Various experimental investigations have been carried out on an absorber plate by employing various roughness elements with different geometries to investigate the heat transfer augmentation and to study the effects of the roughness geometry on the performance of a solar air heater. In this paper an attempt has been made to review experimental investigations on the thermal and thermo-hydraulic performance of 35 different roughness element geometries provided for the absorber plate of solar air heater ducts with the objective of finding the relative performance of such types of artificially roughened solar air heaters. Correlations in terms of the heat transfer and friction factor have been presented that relate the various geometrical parameters of the roughened solar air heaters, as developed by different investigators. All of the roughness geometries are mainly categorized into wire rib, machined rib, and dimple/protrusion surface roughness, which are given in different tables. The results cited in this paper may help researchers in further investigations in this area. A comparison of the performance enhancement factor for different roughness geometries has been done based on the thermo-hydraulic performance criterion (THPC), which takes into consideration Reynolds numbers in the range of 2000–20,000. The solar air heater with multi V-rib roughness with a gap has been found to have the highest value of THPC (equal to 3.5), which exhibited the best thermo-hydraulic performance among all of the roughness geometries.


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