Employing Exergy-Optimized Pin Fins in the Design of an Absorber in a Solar Air Heater

2009 ◽  
Author(s):  
Nwachukwu P. Nwosu
Keyword(s):  
Heat Transfer ◽  
Working Fluid ◽  
Solar Air Heater ◽  
Absorber Plate ◽  
Air Heater ◽  
Heat Transfer Augmentation ◽  
Pin Fins ◽  
Maximum Quantity ◽  
The Cost ◽  
Quantity Of Heat

The performance of a solar air heater is primarily based on the design of the absorber plate and a substantial fraction of the cost of the heater is covered by the cost of the absorber plate. Heat transfer augmentation features for the improvement of heat transfer from the plate to the working fluid are mostly fins however these features also increase pressure drop in the flow channel. The exergy optimization philosophy is adopted in the fin sizing for this air heating application; this optimization philosophy ensures that the maximum quantity of heat is transferred by the fins while generating the least entropy in the system thus conserving exergy. Some important observations relevant in design are made.

scholarly journals Thermal Performance of Three Sided Artificially Roughened Double Duct Parallel Flow Solar Air Heater

2018 ◽  
Vol 7 (1) ◽  
pp. 5-15
Author(s):  
Chander Kant ◽  
Prashant Kumar ◽  
Ankur Gill ◽  
Dhiraj Parkash Dhiman
Keyword(s):  
Heat Transfer ◽  
Reynold Number ◽  
Parallel Flow ◽  
Working Fluid ◽  
Solar Air Heater ◽  
Absorber Plate ◽  
Navier Stokes Equation ◽  
Ansys Fluent ◽  
Air Heater ◽  
Relative Roughness

A solar air heater is basically a heat exchanger, which intercepts the incident solar radiation, converts it into heat and finally transfers this heat to a working fluid for an end use system. The mode of air flowing in the ducts of a solar air heater is one of the most significant aspects concerned with solar air heater which dominantly affect. A double duct parallel flow artificially roughened solar air heater with three sides of the absorber plate is investigated in the current study. Unlike the conventional model of solar air heater with only one sided roughened absorber plate, a novel solar air heater with three artificially roughened absorber plate is used so that the surface area of the absorber plate is increased which ultimately increases the rate of heat transfer. Additionally, a double duct parallel flow arrangement through inner and outer duct of solar air heater is considered order to enhance the heat transfer rate. A numerical investigation of the heat transfer and friction factor characteristics of a double duct parallel flow three sided artificially roughened solar air heater has been carried out. A commercial finite volume CFD code ANSYS FLUENT is used to simulate turbulent air flow through artificial roughened solar air heater. Governing equations of the fluid flow and heat transfer i.e. Navier-Stokes equation and energy equation are solved with RNG k-ε turbulence model. Nine different configuration of square rib are studied with relative roughness pitch (P/e = 5-10) and relative roughness height (e/D = 0.03-0.06). The Reynold number of the flow is varied from 2500 to 16000.

Experimental investigation on heat transfer augmentation of solar air heater using shot blasted V-corrugated absorber plate

2018 ◽  
Vol 127 ◽  
pp. 213-229 ◽  
Author(s):  
Ganesh Kumar Poongavanam ◽  
Karthik Panchabikesan ◽  
Anto Joseph Deeyoko Leo ◽  
Velraj Ramalingam
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Solar Air Heater ◽  
Absorber Plate ◽  
Air Heater ◽  
Heat Transfer Augmentation

Heat transfer augmentation in a solar air heater channel with combined winglets and wavy grooves on absorber plate

2017 ◽  
Vol 122 ◽  
pp. 268-284 ◽  
Author(s):  
Sompol Skullong ◽  
Pongjet Promvonge ◽  
Chinaruk Thianpong ◽  
Nuthvipa Jayranaiwachira ◽  
Monsak Pimsarn
Keyword(s):  
Heat Transfer ◽  
Solar Air Heater ◽  
Absorber Plate ◽  
Air Heater ◽  
Heat Transfer Augmentation

scholarly journals NUMERICAL ANALYSIS FOR NUSSELT NUMBER AND HEAT TRANSFER AUGMENTATION ON SOLAR AIR HEATER ROUGHENED WITH SQUARE RIB ROUGHNESS ON THE ABSORBER PLATE

2019 ◽  
Vol 13 (1) ◽  
Author(s):  
Amit Kumar ◽  
Apurba Layek
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Numerical Study ◽  
Energy Gain ◽  
Solar Air Heater ◽  
Absorber Plate ◽  
Gain Ratio ◽  
Air Heater ◽  
Heat Transfer Augmentation ◽  
Relative Roughness

Heat transfer rate on solar air heater system is generally achieved by suitable modification of absorber plate surface with acceptable geometry of rib roughness. In this paper a numerical study is performed using CFD based computational analysis of heat transfer augmentation equipped with the square rib roughness created artificially on the absorber plate. The 2D analysis is performed using ANSYS 16.2 Code with RNG k-ε turbulence model to investigate the heat transfer and fluid flow characteristics. The augmentation of heat transfer on increase of Reynolds number enhance the Nusselt number which is referred as energy gain ratio with the use of rib roughness was examined and their relative evaluation has been plotted. The parameter which is considered for the range of analysis is taken as relative roughness pitch (P/e), relative roughness height (e/D) and the Reynolds numbers (Re) ranging from 3800-18000. The enhancement of heat transfers due to rib roughness on the absorber plate have been compared with those for smooth ducts for the same flow and thermal boundary condition to determine the energy gain ratio of solar air heater. The result obtained by the present investigation shows that the maximum value of energy gain ratio is found to be about 1.93 times the smooth duct for the studied range of parameters.

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