Experimental and Numerical Investigation of Implementing a Novel Vortex Generator: A Perforated Delta Wing Vortex Generator (PDWVG) on the Performance of Solar Air Collector

Document Type : Research Article


Islamic Azad University-Shahrood Branch, Shahrood, I.R. IRAN


Experiments were carried out for the numerical investigation of heat transfer enhancement in a solar air collector using different types of baffles and vortex generators. In this study, the vortex generator was implemented to increase the efficiency of the solar air collector. The variations in Nusselt number, pressure drop, friction coefficient, and thermal and exergy efficiency in four collectors with different baffles arrangement (type A, B, C, D) were investigated. Type A was chosen as the optimum collector for implementing the vortex generator on the absorber surface. In the solar air collector the effects of using a novel vortex generator - the Perforated Delta Wing Vortex Generator (PDWVG), in comparison with a flat one - the Flat Delta Wing Vortex Generator (FDWVG), were considered. In order to determine the maximum efficiency of the solar air collector, four different pitch ratios of vortex generators were studied. The Nusselt number and pressure drop increased with the Reynolds number but the friction coefficient decreased with Reynolds; the experimental and numerical results revealed that the thermal and exergy efficiency decreased from a specific range. The comparison of PDWVG and FDWVG showed that the presence of holes on the novel vortex generator led to reduced pressure drop and increased heat transfer between the airflow and the absorber surface. Increasing the number of vortex generator rows had a slight effect on increasing the studied parameters. The results showed that collector type A with ep=0.55 of PDWVG improves the energy and exergy efficiency 4.43% and 5.29% respectively.


Main Subjects

[1] Rouhollah Shahnazi Z. D. S., Do Renewable Energy Production Spillovers Matter in the EU?, Renewable Energy, 150: 786-796 (2019).
[2] Jiashun Huang W. L., Guo L., Hu X., Hall J.W., Renewable Energy and Household Economy in Rural China, Renewable Energy, 155: 669-676 (2020).
[3] Murshed M., Are Trade Liberalization Policies aligned with Renewable Energy Transition in Low and Middle-Income Countries? An Instrumental Variable Approach, Renewable Energy, 151: 1110-1123 (2020).
[4] Kęstutis Valančius R. M., Solar Energy as a Tool of Renovating Soviet-Type Multi Apartment Buildings, Solar Energy, 198: 93-100 (2020).
[5] Mariaemma Sala C.S.P.L., Francesco Frontini, Lavinia Ch.Tagliabue, Enrico De Angelis, The Energy Performance Evaluation of Buildings in an Evolving Built Environment: An Operative Methodology, Energy Procedia, 91: 1005-1011 (2016).
[6] Chao Chen F. H., Mahkamov Kh., Wei Sh., Ma X., Ling H., Zhao Ch., Numerical and Experimental Study of Laboratory and Full-Scale Prototypes of the Novel Solar Multi-Surface Air Collector with Double-Receiver Tubes Integrated into a Greenhouse Heating System, Solar Energy, 202: 86-103 (2020).
[7] Jacek Jan Fiuk K.D., Experimental Investigations on Thermal Efficiency of a Prototype Passive Solar Air Collector with Wavelike Baffles, Solar Energy, 188: 495–506 (2019).
[8] Chen P.B.Z.D., Halldorsson J., Byrjalsen C., Heiselberg P., Li Y., An Experimental Investigation of a Solar Chimney Model with Uniform Wall Heat Flux, Building and Environment, 38(7): 893-906 (2003).
[9] Afriyie M. A. A. N. J.K., Rajakaruna H., Forson F.K., Experimental Investigations of a Chimney-Dependent Solar Crop Dryer, Renewable Energy, 34(1): 217-222 (2009).
[10] Fudholi K.S.A., Ruslan M.H., Alghoul M.A., Sulaiman M.Y., Review of Solar Dryers for Agricultural and Marine Products, Renewable and Sustainable Energy Reviews, 14(1): 1-30 (2010).
[11] Salwa Bouadila S.K., Lazaar M., Skouri S., Farhat A., Performance of a New Solar Air Heater with Packed-Bed Latent Storage Energy for Nocturnal Use, Applied Energy, 110: 267-275 (2013).
[12] Wardah Fatimah Mohammad Yusoff E.S., Nor Mariah Adam, Abdul Razak Sapian, Mohamad Yusof Sulaiman, Enhancement of Stack Ventilation in Hot and Humid Climate Using a Combination of Roof Solar Collector and Vertical Stack, Building and Environment, 45(10): 2296-2308 (2010).
[13] Azim Doğuş Tuncer A.S., Khanlari A., Amini A., Şirin C., Thermal Performance Analysis of a Quadruple-Pass Solar Air Collector Assisted Pilot-Scale Greenhouse Dryer, Solar Energy, 203: 304–316 (2020).
[14] Xianli Li S.Z., Tian G., Zhang L., Yao W., A New Energy Saving Ventilation System Assisted by Transpired Solar Air Collectors for Primary and Secondary School Classrooms in Winter, Building and Environment, 117. 106895 (2020).
[15] Siddharth Suman M.K.K., Pathak M., Performance Enhancement of Solar Collectors—A Review, Renewable and Sustainable Energy Reviews, 49: 192-210 (2015).
[16] Youngjin Choi K.T., Mae M., System Performance of a Residential Building Using the Air-Based Solar Heating System, Solar Energy, 171: 47-63 (2018).
[17] Tao Yu B.L., Lei B., Yuan Y., Bi H., Zhang Z., Thermal Performance of a Heating System Combining Solar Air Collector with Hollowventilated Interior Wall in Residential Buildings on Tibetan Plateau, Energy, 182: 93-109 (2019).
[18] Žukauskas A., Enhancement of Forced Convection Heat Transfer in Viscous Fluid Flows, International Journal of Heat and Mass Transfer, 37: 207-212 (1994).
[19] Daniel A.D.R., Dezan J., Wallace G. Ferreira, Parametric Sensitivity Analysis and Optimisation of a Solar Air Heater with Multiple Rows of Longitudinal Vortex Generators, Applied Energy, 263: 114556 (2020).
[20] Zheng W., SZhang H., You Sh., Fu Y., Zheng X., Thermal Performance Analysis of a Metal Corrugated Packing Solar Air Collector in Cold Regions," Applied Energy, 203: 938-947 (2017).
[21] Abdullah A.S., Omara Z.M., Bek M.A., Kabeel A.E., "Performance Evaluation of a New Counter Flow Double Pass Solar Air Heater with Turbulators, Solar Energy, 173: 398-406 (2018).
[22] Rajneesh Kumar A.K., Goel V, A Parametric Analysis of Rectangular Rib Roughened Triangular Duct Solar Air Heater Using Computational Fluid Dynamics, Solar Energy, 157: 1095-1107 (2017).
[23] Sari A., Sadi M., Shafiei Sabet G., Mohammadiun M., Mohammadiun H., Experimental Analysis and Exergetic Assessment of the Solar Air Collector with Delta Winglet Vortex Generators and Baffles, Journal of Thermal Analysis and Calorimetry, (2020).
[24] Md Azharul Karim, Hawlader M.N.A., Performance Evaluation of a V-Groove Solar Air Collector for Drying Applications, Applied Thermal Engineering, 26(1): 121-130 (2006).
[25] Zhu T., Diao Y., Zhao Y., Ma Ch., Performance Evaluation of a Novel Flat-Plate Solar Air Collector with Micro-Heat Pipe Arrays (MHPA)," Applied Thermal Engineering, 118, 1-16 (2017).
[26] Agathokleous R., Barone G., Buonomano A., Forzano C., Kalogirou S.A., Palombo A., Building Façade Integrated Solar Thermal Collectors for Air Heating: Experimentation, Modelling and Applications, Applied Energy, 239: 658–679 (2019).
[27] Esen H., Experimental Energy and Exergy Analysis of a Double-Flow Solar Air Heater Having Different Obstacles on Absorber Plates, Building and Environment, 43: 1046-1054 (2008).
[28] Karsli S., Performance Analysis of New-Design Solar Air Collectors for Drying Applications, Renewable Energy, 32(10): 1645-1660 (2007).
[29] Irfan Kartbas E. T., Experimental Investigation of Solar Air Heater with Free and Fixed Fins: Efficiency and Exergy Loss, International Journal of Science & Technology, 1(1): 75-82 (2006).
[30] Kavak Akpinar E., Koçyiğit F., Energy and Exergy Analysis of a New Flat-Plate Solar Air Heater Having Different Obstacles on Absorber Plates, Applied Energy, 87(11): 3438-3450 (2010).
[31] Petela R., Exergy of Undiluted Thermal Radiation, Solar Energy, 74: 469-488 (2003).