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Sunil Chamoli - One of the best experts on this subject based on the ideXlab platform.

  • experimental and cfd investigation of convection heat transfer in Solar Air Heater with reverse l shaped ribs
    Solar Energy, 2016
    Co-Authors: Vipin B Gawande, D B Zodpe, A S Dhoble, Sunil Chamoli
    Abstract:

    Abstract A Solar Air Heater is a thermal system which uses artificial roughness in the form of repeated ribs on the absorber plate to enhance the heat transfer rate. Forced convection heat transfer of Air in a Solar Air Heater with reverse L-shaped ribs has been carried out experimentally and numerically. Thermal performance of Solar Air Heater is studied with design variables such as relative roughness pitch (7.14 ⩽  P / e  ⩽ 17.86), Reynolds number (3800 ⩽  Re  ⩽ 18,000), heat flux (1000 W/m 2 ) and constant relative roughness height ( e / D  = 0.042). A two dimensional CFD simulation is carried out with using CFD code, ANSYS FLUENT and RNG k – ɛ turbulence model, for solving turbulence terms in governing equations. The presence of reverse L-shaped rib shows a significant effect on heat transfer and friction factor characteristics, relative to change in relative roughness pitch ( P / e ) and Reynolds number ( Re ). Thermo hydraulic performance parameter (T.H.P.P) of 1.90 considering heat transfer augmentation with same pumping power, has been evaluated for optimum configuration of the roughness element (reverse L-shaped rib) for artificially roughened Solar Air Heater. It has been found that the numerical results are in good agreement with the experimental results for the range of parameters investigated. Correlations for Nusselt number and friction factor have been developed as a function of roughness and flow parameters.

  • a review of cfd methodology used in literature for predicting thermo hydraulic performance of a roughened Solar Air Heater
    Renewable & Sustainable Energy Reviews, 2016
    Co-Authors: Vipin B Gawande, D B Zodpe, A S Dhoble, Sunil Chamoli
    Abstract:

    Abstract A Solar Air Heater is experimentally investigated by many researchers to study the effect of operating and geometrical parameters on heat transfer and fluid flow characteristics. The availability of highly advanced computer hardware and development in numerical methods, encouraging the future researchers to carry out the simulations of Solar Air Heater using various roughness geometries with different ranges of operating and geometrical parameters. CFD is emerging as an efficient tool to detect the optimum configuration of rib for its maximum thermo hydraulic performance before carrying out actual experimentation. This article discusses different approaches used to investigate the thermal performance of Solar Air Heater. The computational approach, i.e. CFD methodology is discussed using the reference of commercial CFD software ANSYS FLUENT. The main aim of the article is to present a detailed review of the literature that deals with the application of CFD in the design of Solar Air Heater. The paper has a concise summary of each reviewed article in the form of, type of computational domain (2D/3D), turbulence model used, type of CFD commercial software used, range of operating and geometrical parameters and best results obtained from CFD. The article also tabulated the optimum values of relative roughness pitch ( P / e ) and relative roughness height ( e / D ) for maximum heat transfer enhancement in roughened Solar Air Heater duct.

  • Experimental and CFD-based thermal performance prediction of Solar Air Heater provided with right-angle triangular rib as artificial roughness
    Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2016
    Co-Authors: Vipin B Gawande, D B Zodpe, A S Dhoble, Sunil Chamoli
    Abstract:

    An experimental and two-dimensional computational fluid dynamics (CFD) analysis of a Solar Air Heater has been carried out using right-angle triangular ribs as artificial roughness on the absorber plate as a convenient method for enhancement of thermal performance of Solar Air Heater. The relative roughness pitch ( P / e  = 7.14–35.71), Reynolds number ( Re  = 3800–18000), and relative roughness height ( e / D  = 0.021–0.042) have been selected as design variables for both analysis. ANSYS FLUENT 14.5 with renormalization group k – ε turbulence model is selected for the analysis of computational domain of Solar Air Heater during CFD analysis. An enhancement in Nusselt number and friction factor with a decrease in relative roughness pitch ( P / e ) and increase in relative roughness height are presented and discussed with reference to experimental investigation and CFD analysis. The results of roughened Solar Air Heater duct have been compared with smooth duct under similar flow condition. The optimum value of rib configuration based on constant pumping power requirement has been derived using thermo-hydraulic performance parameter and has been found 2.03 at P / e  = 7.14. e / D  = 0.042 and at a Reynolds number of 15,000 for the investigated range of parameters.

  • A review of the performance of double pass Solar Air Heater
    Renewable and Sustainable Energy Reviews, 2012
    Co-Authors: Sunil Chamoli, N. S. Thakur, Ranchan Chauhan, J.s. Saini
    Abstract:

    Abstract Improvement of the thermal performance of a Solar Air Heater can be obtained by enhancing the rate of heat transfer. The thermal efficiency of double pass Solar Air Heater is higher in comparison to single pass with the concept involved of doubling the heat transfer area without increase in the system cost. Numbers of studies have been carried out on the performance analysis of double pass Solar Air Heater provided with heat transfer augmentation techniques viz. using extended surfaces, packed bed, corrugated absorber were reported in the literature and found more increase in the thermal efficiency in comparison to conventional double duct Solar Air Heater. These studies includes the design of double pass Solar Air Heater, heat transfer enhancement, flow phenomenon and pressure drop in duct. This paper presents an extensive study of the research carried out on double pass Solar Air Heater. Based on the literature review, it is concluded that most of the studies carried out on double pass Solar Air Heater integrated with porous media and extended surfaces. Few studies were carried out with corrugated absorber. Further no study has been reported so far on double pass Solar Air Heater with absorber plate artificially roughened from both the sides. Mathematical models based on energy analysis of some configurations of Solar Air Heater have been discussed.

J.s. Saini - One of the best experts on this subject based on the ideXlab platform.

  • heat and fluid flow characteristics of roughened Solar Air Heater ducts a review
    Renewable Energy, 2012
    Co-Authors: A. Kumar, R P Saini, J.s. Saini
    Abstract:

    Artificial roughness in the form of repeated ribs is one of the effective way of improving the performance of a Solar Air Heater ducts. Various studies have been carried out to determine the effect of different artificial roughness geometries on heat transfer and friction characteristics in Solar Air Heater ducts. The objective of this paper is to review various studies, in which different artificial roughness elements are used to enhance the heat transfer coefficient with little penalty of friction factor. On the basis of correlations developed by various investigators for heat transfer coefficient and friction factor, an attempt has been made to compare the thermohydraulic performance of roughened Solar Air Heater ducts. It has been found that lot of experimental and analytical studies reported in the literature.

  • A review of the performance of double pass Solar Air Heater
    Renewable and Sustainable Energy Reviews, 2012
    Co-Authors: Sunil Chamoli, N. S. Thakur, Ranchan Chauhan, J.s. Saini
    Abstract:

    Abstract Improvement of the thermal performance of a Solar Air Heater can be obtained by enhancing the rate of heat transfer. The thermal efficiency of double pass Solar Air Heater is higher in comparison to single pass with the concept involved of doubling the heat transfer area without increase in the system cost. Numbers of studies have been carried out on the performance analysis of double pass Solar Air Heater provided with heat transfer augmentation techniques viz. using extended surfaces, packed bed, corrugated absorber were reported in the literature and found more increase in the thermal efficiency in comparison to conventional double duct Solar Air Heater. These studies includes the design of double pass Solar Air Heater, heat transfer enhancement, flow phenomenon and pressure drop in duct. This paper presents an extensive study of the research carried out on double pass Solar Air Heater. Based on the literature review, it is concluded that most of the studies carried out on double pass Solar Air Heater integrated with porous media and extended surfaces. Few studies were carried out with corrugated absorber. Further no study has been reported so far on double pass Solar Air Heater with absorber plate artificially roughened from both the sides. Mathematical models based on energy analysis of some configurations of Solar Air Heater have been discussed.

Vipin B Gawande - One of the best experts on this subject based on the ideXlab platform.

  • thermal performance evaluation of Solar Air Heater using combined square and equilateral triangular rib roughness
    Australian journal of mechanical engineering, 2018
    Co-Authors: Vipin B Gawande, D B Zodpe, A S Dhoble, S G Fale
    Abstract:

    ABSTRACTHeat transfer and fluid flow characteristics in roughened Solar Air Heater duct with combined square and equilateral triangular ribs as roughness is investigated using experimental and comp...

  • experimental and cfd investigation of convection heat transfer in Solar Air Heater with reverse l shaped ribs
    Solar Energy, 2016
    Co-Authors: Vipin B Gawande, D B Zodpe, A S Dhoble, Sunil Chamoli
    Abstract:

    Abstract A Solar Air Heater is a thermal system which uses artificial roughness in the form of repeated ribs on the absorber plate to enhance the heat transfer rate. Forced convection heat transfer of Air in a Solar Air Heater with reverse L-shaped ribs has been carried out experimentally and numerically. Thermal performance of Solar Air Heater is studied with design variables such as relative roughness pitch (7.14 ⩽  P / e  ⩽ 17.86), Reynolds number (3800 ⩽  Re  ⩽ 18,000), heat flux (1000 W/m 2 ) and constant relative roughness height ( e / D  = 0.042). A two dimensional CFD simulation is carried out with using CFD code, ANSYS FLUENT and RNG k – ɛ turbulence model, for solving turbulence terms in governing equations. The presence of reverse L-shaped rib shows a significant effect on heat transfer and friction factor characteristics, relative to change in relative roughness pitch ( P / e ) and Reynolds number ( Re ). Thermo hydraulic performance parameter (T.H.P.P) of 1.90 considering heat transfer augmentation with same pumping power, has been evaluated for optimum configuration of the roughness element (reverse L-shaped rib) for artificially roughened Solar Air Heater. It has been found that the numerical results are in good agreement with the experimental results for the range of parameters investigated. Correlations for Nusselt number and friction factor have been developed as a function of roughness and flow parameters.

  • a review of cfd methodology used in literature for predicting thermo hydraulic performance of a roughened Solar Air Heater
    Renewable & Sustainable Energy Reviews, 2016
    Co-Authors: Vipin B Gawande, D B Zodpe, A S Dhoble, Sunil Chamoli
    Abstract:

    Abstract A Solar Air Heater is experimentally investigated by many researchers to study the effect of operating and geometrical parameters on heat transfer and fluid flow characteristics. The availability of highly advanced computer hardware and development in numerical methods, encouraging the future researchers to carry out the simulations of Solar Air Heater using various roughness geometries with different ranges of operating and geometrical parameters. CFD is emerging as an efficient tool to detect the optimum configuration of rib for its maximum thermo hydraulic performance before carrying out actual experimentation. This article discusses different approaches used to investigate the thermal performance of Solar Air Heater. The computational approach, i.e. CFD methodology is discussed using the reference of commercial CFD software ANSYS FLUENT. The main aim of the article is to present a detailed review of the literature that deals with the application of CFD in the design of Solar Air Heater. The paper has a concise summary of each reviewed article in the form of, type of computational domain (2D/3D), turbulence model used, type of CFD commercial software used, range of operating and geometrical parameters and best results obtained from CFD. The article also tabulated the optimum values of relative roughness pitch ( P / e ) and relative roughness height ( e / D ) for maximum heat transfer enhancement in roughened Solar Air Heater duct.

  • Experimental and CFD-based thermal performance prediction of Solar Air Heater provided with right-angle triangular rib as artificial roughness
    Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2016
    Co-Authors: Vipin B Gawande, D B Zodpe, A S Dhoble, Sunil Chamoli
    Abstract:

    An experimental and two-dimensional computational fluid dynamics (CFD) analysis of a Solar Air Heater has been carried out using right-angle triangular ribs as artificial roughness on the absorber plate as a convenient method for enhancement of thermal performance of Solar Air Heater. The relative roughness pitch ( P / e  = 7.14–35.71), Reynolds number ( Re  = 3800–18000), and relative roughness height ( e / D  = 0.021–0.042) have been selected as design variables for both analysis. ANSYS FLUENT 14.5 with renormalization group k – ε turbulence model is selected for the analysis of computational domain of Solar Air Heater during CFD analysis. An enhancement in Nusselt number and friction factor with a decrease in relative roughness pitch ( P / e ) and increase in relative roughness height are presented and discussed with reference to experimental investigation and CFD analysis. The results of roughened Solar Air Heater duct have been compared with smooth duct under similar flow condition. The optimum value of rib configuration based on constant pumping power requirement has been derived using thermo-hydraulic performance parameter and has been found 2.03 at P / e  = 7.14. e / D  = 0.042 and at a Reynolds number of 15,000 for the investigated range of parameters.

Paisarn Naphon - One of the best experts on this subject based on the ideXlab platform.

  • On the performance and entropy generation of the double-pass Solar Air Heater with longitudinal fins
    Renewable Energy, 2005
    Co-Authors: Paisarn Naphon
    Abstract:

    The performance and entropy generation of the double-pass flat plate Solar Air Heater with longitudinal fins are studied numerically. The mathematical models described the heat transfer characteristics of the double-pass flat plate Solar Air Heater derived from the conservation equations of energy. The predictions are done at Air mass flow rate ranging between 0.02 and 0.1 kg/s. The effects of the inlet condition of working fluid and dimension of the Solar Air Heater on the heat transfer characteristics, performance, and entropy generation are considered.

  • effect of porous media on the performance of the double pass flat plate Solar Air Heater
    International Communications in Heat and Mass Transfer, 2005
    Co-Authors: Paisarn Naphon
    Abstract:

    The heat transfer characteristics and performance of the double-pass flat plate Solar Air Heater with and without porous media are studied numerically. The mathematical models described the heat transfer characteristics of the double-pass flat plate Solar Air Heater are derived from the energy conservation equations. The implicit method of finite-difference scheme is employed to solve these models. The effect of the thermal conductivity of the porous media on the heat transfer characteristics and performance is considered. The results obtained from the model are validated by comparison with experimental data of previous researchers. There is reasonable agreement between the present model and experiment.

Prabha Chand - One of the best experts on this subject based on the ideXlab platform.

  • performance enhancement of Solar Air Heater using herringbone corrugated fins
    Energy, 2017
    Co-Authors: Rajesh Kumar, Prabha Chand
    Abstract:

    Abstract The present paper deals with the performance enhancement of the Solar Air collector with the use of herringbone corrugated fins attached below the absorber plate along the fluid flow channel. A theoretical model is developed based on energy balance equation of the new design Solar Air Heater and is solved with the use of MATLAB simulation code. The effect of operating parameters viz. mass flow rate, system parameter viz. fin pitch, fin spacing ratio, flow cross section aspect ratio and metrological parameter viz. Solar intensity on the thermal performance of the herringbone corrugated finned Solar Air Heater is investigated. It is observed that the thermal efficiency of the conventional Solar Air Heater improves from 36.2% to 56.6% with fin pitch 2.5 cm at fixed mass flow rate of 0.026 kg/s but at the penalty of increased pressure drop. To account for this the term “effective or thermohydraulic efficiency” is included.

  • Effect of Collector Aspect Ratio on the Thermal Performance of Wavy Finned Absorber Solar Air Heater
    World Academy of Science Engineering and Technology International Journal of Electrical Computer Energetic Electronic and Communication Engineering, 2016
    Co-Authors: Abhishek Priyam, Prabha Chand
    Abstract:

    A theoretical investigation on the effect of collector aspect ratio on the thermal performance of wavy finned absorber Solar Air Heaters has been performed. For the constant collector area, the various performance parameters have been calculated for plane and wavy finned Solar Air Heaters. It has been found that the performance of wavy finned Solar Air Heater improved with the increase in the collector aspect ratio. The performance of wavy finned Solar Air Heater has been found 30 percent higher than those of plane Solar Air Heater. The obtained results for wavy fin Solar Air Heaters are compared with the available experimental data of most common type Solar Air Heaters.

  • Thermal and thermohydraulic performance of wavy finned absorber Solar Air Heater
    Solar Energy, 2016
    Co-Authors: Abhishek Priyam, Prabha Chand
    Abstract:

    Abstract In the present paper, the performance analysis of finned absorber Solar Air Heater has been investigated analytically. The fluid channel is formed by two transversely positioned wavy fins attached on the absorber plate with bottom side thermally insulated and the top surface of absorber subjected to uniform heat flux. The expression for collector efficiency factor of such collector has been developed. Effects of mass flow rates and fin spacings on the thermal performance have been presented and the results are compared with plain Solar Air Heater. Further, the thermohydraulic performance parameter called ‘effective efficiency’ has been employed and presented to express the net useful thermal energy gain, taking into account the equivalent thermal energy required to produce the work energy necessary to overcome the additional friction or hydraulic losses as a result of extended surfaces on the absorber plate. The mathematical model provides reasonable predictions of the performance of wavy fin Solar Air Heater and it can be useful in designing such types of Solar Air Heater.