scholarly journals Effective Efficiency Evaluation for Solar Air Heater using Different Artificial Coarseness

2021 ◽  
Vol 12 (2) ◽  
pp. 2060-2069
Author(s):  
Gaurav Bharadwaj
Keyword(s):  
Solar Air Heater ◽  
Efficiency Evaluation ◽  
Air Heater ◽  
Research Article ◽  
Effective Efficiency ◽  
Selection Of

Effective efficiency evaluation is one of the important parameters in designing and selection of SAH. In this research article author have evaluated the effective efficiency of SAH using different coarseness configuration attached to the underside of collector of SAH used by various research. Correlation developed by various researchers for various coarseness has been used for the evaluation of effective efficiency. Effective efficiency evaluated for each coarseness used in SAH has been compared and suggested that which coarseness is to be used on the basis of comparison.

Experimental Investigation of Enhanced Heat Transfer and Pressure Drop in a Solar Air Heater Duct With Discretized Broken V-Rib Roughness

2014 ◽  
Vol 137 (2) ◽  
Author(s):  
Anil Kumar Patil ◽  
J. S. Saini ◽  
Krishna Kumar
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Geometrical Parameters ◽  
Solar Air Heater ◽  
Enhanced Heat Transfer ◽  
Transfer Rates ◽  
Air Heater ◽  
Effective Efficiency ◽  
Flow Through ◽  
Considerable Enhancement

The present study examines the augmentation in heat transfer and friction in a flow through solar air heater duct with discretized broken V-rib roughness. The experimental outcomes pertaining to Reynolds number from 3000 to 17,000, relative gap position (s′/s) from 0.2 to 0.8, relative staggered rib position (p′/p) from 0.2 to 0.8 have been presented and discussed. Discretized broken V-rib roughness brought out considerable enhancement in heat transfer rates over V-rib roughness and smooth duct. Effective efficiency of discretized broken V-rib roughened solar air heater is estimated and geometrical parameters of roughness are optimized with regard to temperature rise parameter and insolation.

scholarly journals Thermo-Hydraulic Performance Characteristics and Optimization of Protrusion Rib Roughness in Solar Air Heater

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3159
Author(s):  
Tabish Alam ◽  
Chandan Swaroop Meena ◽  
Nagesh Babu Balam ◽  
Ashok Kumar ◽  
Raffaello Cozzolino
Keyword(s):  
Temperature Increase ◽  
Hydraulic Performance ◽  
Operating Conditions ◽  
Solar Air Heater ◽  
Additional Mass ◽  
Absorber Plate ◽  
Analytical Technique ◽  
Air Heater ◽  
Flow Reynolds Number ◽  
Effective Efficiency

To enhance the thermal performance of solar air heaters (SAHs), protrusion ribs on the absorber are considered to be an attractive solution due to their several advantages. These ribs do not cause a significant pressure drop in the SAH duct and help to enhance the heat transfer to flowing air. On the other hand, a degree of roughness of the protrusion rib on the absorber can be produced by pressing the indenting device without adding additional mass. In this paper, the thermo-hydraulic performances of different roughnesses of the conical protrusion rib on the absorber plate have been evaluated by the mutual consideration of thermal as well as hydraulic performance in term of net effective efficiency. Therefore, an analytical technique has been exploited to predict the characteristics of the net effective efficiency under various operating conditions, such as the flow Reynolds number, temperature increase parameter and insolation. The effects of the conical protrusion rib roughness—namely the relative rib pitch (p/e) and relative rib height e/D) in the ranges of 6–12 and 0.200–0.044, respectively—have been evaluated. The highest value of net effective efficiency of 70.92% was achieved at a p/e of 10 and e/D of 0.0289. The optimization of the rib parameters has been carried out in different ranges of temperature increase parameters for the highest values of net effective efficiency. A unique combination of rib parameters—a p/e of 10 and e/D of 0.044—are observed to lead to the best performance when operating a solar air heater with a temperature increase parameter of more than 0.00789 K·m2/W.

scholarly journals Life Cycle Evaluation of Sustainable Practices in a Sauna Bath

2019 ◽  
Vol 11 (20) ◽  
pp. 5647
Author(s):  
Luis Velazquez ◽  
Sandra Villalba ◽  
Ricardo García ◽  
Nora Munguía
Keyword(s):  
Life Cycle ◽  
Thermal Energy ◽  
Material Selection ◽  
Well Being ◽  
Solar Air Heater ◽  
Sustainable Solutions ◽  
Air Heater ◽  
Graphene Coating ◽  
The Impact ◽  
Selection Of

To battle climate change, the search for sustainable solutions and the reduction of environmental impacts are activities that must be pursued in all areas of human life. This study aimed to conduct a Life Cycle Evaluation of the environmental aspects and potential benefits associated with two different innovative adaptations to a sauna bath. The first adaptation is related to the selection of wooden materials for the bath’s interior construction; the second is related to the source of thermal energy. For the selection of wooden materials, experiments were performed to evaluate a graphene coating and its capacity to increase the durability of wooden materials. For the thermal energy source, a solar air heater was experimentally assessed to confirm its capacity to supply the thermal energy required to operate the sauna bath. Finally, the material selection and the heating operation were integrated in a Life Cycle Impact Assessment, contrasting two scenarios: “business as usual sauna bath” and “sustainable sauna bath.” The findings showed a significant reduction of around 61% of total emissions from the application of a solar air heater and wooden materials treated with a graphene coating. At the end of this study, “human well-being,” “ecosystems,” and “resources” were expressed in monetary values to assess the impact of the above practices in a sauna bath.

scholarly journals Performance Analysis of Solar Air Heater using CFD Simulation

2018 ◽  
Vol 8 (01) ◽  
Author(s):  
Ambreesh Prasad Shukla ◽  
Rakesh Kushwaha ◽  
Bhupendra Gupta ◽  
Anand Bisen
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Solar Energy ◽  
Transfer Coefficient ◽  
Cfd Simulation ◽  
Solar Air Heater ◽  
Outlet Temperature ◽  
Absorber Plate ◽  
Air Heater ◽  
Research Article

Solar energy has emerged as one of the alternate to conventional sources of energy. Solar air heaters are one of the important devices to utilize solar energy. But, poor heat transfer coefficient is one of the major problem in solar air heater. In this research article, an attempt is made to increase heat transfer coefficient of solar air heater by putting Hollow bodies over the absorber plate. These resulted in increase in heat transfer coefficient, efficiency and increase in outlet temperature of air simultaneously

PERFORMANCE ANALYSIS OF DOUBLE PASS COUNTER FLOW SOLAR AIR HEATER FOR DRYING APPLICATION

2018 ◽  
Author(s):  
D.V.N. Lakshmi ◽  
Palanisamy Muthukumar ◽  
Dr.Apurba Layek ◽  
Abhimanyu Kumar Singh ◽  
Sushoban Das
Keyword(s):  
Performance Analysis ◽  
Solar Air Heater ◽  
Double Pass ◽  
Counter Flow ◽  
Air Heater
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