Fully developed periodic and thermal performance evaluation of a solar air heater channel with wavy-triangular ribs placed on an absorber plate

2019 ◽  
Vol 140 ◽  
pp. 413-428 ◽  
Author(s):  
P. Promthaisong ◽  
S. Eiamsa-ard
Keyword(s):  
Performance Evaluation ◽  
Thermal Performance ◽  
Solar Air Heater ◽  
Absorber Plate ◽  
Air Heater

Thermal Performance Analysis of a Rectangular Longitudinal Finned Solar Air Heater With Semicircular Absorber Plate

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
Satyender Singh ◽  
Prashant Dhiman
Keyword(s):  
Thermal Performance ◽  
Numerical Solutions ◽  
Solar Air Heater ◽  
Duct Flow ◽  
Balance Equations ◽  
Absorber Plate ◽  
Ansys Fluent ◽  
Air Heater ◽  
Glass Cover ◽  
Good Agreement

Thermal performance of a single-pass single-glass cover solar air heater consisting of semicircular absorber plate finned with rectangular longitudinal fins is investigated. The analysis is carried out for different hydraulic diameters, which were obtained by varying the diameter of the duct from 0.3–0.5 m. One to five numbers of fins are considered. Reynolds number ranges from 1600–4300. Analytical solutions for energy balance equations of different elements and duct flow of the solar air heater are presented; results are compared with finite-volume methodology based numerical solutions obtained from ansys fluent commercial software, and a fairly good agreement is achieved. Moreover, analysis is extended to check the effect of double-glass cover and the recycle of the exiting air. Results revealed that the use of double-glass cover and recycle operation improves the thermal performance of solar air heater.

Experimental Investigation on Thermal Performance in Three-Sided Solar Air Heaters Having an Alignment of Multi-v and Transverse Wire Roughness on the Absorber Plate

2020 ◽  
Vol 142 (5) ◽  
Author(s):  
Dhananjay Kumar ◽  
Laljee Prasad
Keyword(s):  
Thermal Performance ◽  
Thermal Efficiency ◽  
Roughness Height ◽  
Space Heating ◽  
Solar Air Heater ◽  
Artificial Roughness ◽  
Absorber Plate ◽  
Air Heater ◽  
Relative Roughness ◽  
Operational Constraints

Abstract The use of artificial roughness is an efficient and commercial way to appreciate the thermal performance from the collector to the air in solar air heater ducts, for numerous applications such as space-heating, crop-drying, and seasoning of timber industrial purpose. In this paper, the tentative inquiry on thermal enactment using new-fangled of three-sided roughened quadrilateral duct solar air heater having an alignment of multiple-v and transverse wire is performed and compared the outcomes with smooth duct air heater under similar operational circumstances. The modification of an arrangement and operational constraints is inspected within the restrictions, the moral of four-sided duct aspect ratio (W/H) = 8, the Reynolds number occupied from 3000 to 12,000, fraction of pitch to roughness height, P/e in the range of 10–25; ratio of roughness height to hydraulic diameter, e/D in the range of 0.018–0.042; at flow attack angle, α = 60 deg for constant moral of relative roughness width, (W/w) = 6. The augmentation on thermal efficiency in three-sided rugged duct is found to be 23–86% when compared to smooth duct, and the maximum thermal efficiency can occur at P/e = 10 and e/D = 0.042. The enhancement in air temperature flowing under three-sided roughened duct is found to be 49.27% more than that of a smooth duct. The instant innovative form of three-sided roughened solar air warmer would be preferable to those of a smooth solar air heater with respect to heat assignment.

Design and thermal performance evaluation of a novel solar air heater

2015 ◽  
Vol 77 ◽  
pp. 501-511 ◽  
Author(s):  
Abhishek Saxena ◽  
Ghanshyam Srivastava ◽  
Vineet Tirth
Keyword(s):  
Performance Evaluation ◽  
Thermal Performance ◽  
Solar Air Heater ◽  
Air Heater

Performance evaluation of a natural-convection solar air-heater with a rectangular-finned absorber plate

2011 ◽  
Vol 52 (2) ◽  
pp. 1215-1225 ◽  
Author(s):  
M. Fakoor Pakdaman ◽  
A. Lashkari ◽  
H. Basirat Tabrizi ◽  
R. Hosseini
Keyword(s):  
Performance Evaluation ◽  
Natural Convection ◽  
Solar Air Heater ◽  
Absorber Plate ◽  
Air Heater
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