Performance prediction of three sides hemispherical dimple roughened solar duct

Performance prediction of three sides hemispherical dimple roughened solar duct

Vikash Kumar Laljee Prasad* 

Dept. of Mechanical Engineering, Malla Reddy College of Engineering, Secunderabad 500100, India

Dept. of Mechanical Engineering, NIT Jamshedpur Jharkhand 831014, India

Corresponding Author Email: 
lalprdch1@rediffmail.com
Page: 
273-293
|
DOI: 
https://doi.org/10.3166/I2M.17.273-293
Received: 
|
Accepted: 
|
Published: 
30 June 2018
| Citation

ACCESS

Abstract: 

The present paper deals with the results of experimental investigation conducted upon one and three sides concave dimple roughened solar air heater ducts and examine the effects of roughness and flow parameters on thermal efficiency results. The present investigation is carried under the Reynolds number range of 2500-12500, relative roughness pitch of 8-15 and relative roughness height of 0.018-0.045. The augmentation in fluid (air) temperature flowing under three sides concave dimple roughened duct is found to be 34.87% more than one side roughened duct. The plate temperature excess range for three sides roughened duct is significantly lower (12.5-28.5˚C) compared to one side roughened duct (17.5-35.5˚C). The maximum thermal efficiency is obtained at relative roughness pitch of 12 and relative roughness height of 0.036. The augmentation in thermal efficiency of three sides over those of one side roughened duct is found to be 44-56 % for varying p/e and 39-51 % for varying e/Dh.

Keywords: 

concave dimple, one and three sides roughened duct, relative roughness height relative roughness pitch, solar air heater

1. Introduction
2. Experimentation and methodology
3. Data reduction
4. Measurement uncertainty
5. Results and discussions
6. Conclusion
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