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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 4289 Design and Analysis of Solar Chimney for Passive Ventilation system Santosh P. Basare1, Arun M. Kulkarni2, Rajashekhar Sardagi3, Amol S. Dayma4 1Santosh P. Basare, Dept. of Mechanical Engineering, SSJCET Asangaon. 2 Arun M. Kulkarni, Dept. of Mechanical Engineering, SSJCET Asangaon. 3Rajashekhar Sardagi, Dept. of Mechanical Engineering, SSJCET Asangaon. 4Amol S. Dayma, Dept. of Mechanical Engineering, SSJCET Asangaon. ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - By using solar chimney we can produce the sufficient amount of Ventilation in rooms or in a factory. In this project CFD technology is used to investigate the changes in flow kinetic energy caused by the variation of tower flow area with height. It was found that the tower area change affects the efficiency and mass flow rate through the plant. So By changing collector area, chimney tower radius and height it can possible to get maximum efficiency with smallchangein design of solar chimney. Key Words: Solar chimney, CFD analysis, Ventilation. 1. Introduction A solar chimney is a solar power generating facility, which uses solar radiation to increase the internal energy of air flowing through the system, thereby converting solar energy into kinetic energy. The kinetic energy from theairis then transformed in electricity by use of a suitable turbine. The stack pressure difference generated can alsobeused for natural ventilation. The pressure difference which in turn drives the air inside the chimney is used for providing natural ventilation for a building.[30] A solar chimney consists of three main components: (1) The solar collector or the greenhouse (2) The chimney, and (3) The turbine. 1.1 Working Principle Fig. 1.1 Solar Chimney [28] Hot air is produced by the sun under a large glass roof. Direct and diffuse solar radiation strikes the glass roof, where specific fractionsoftheenergyare reflected,absorbed and transmitted. Through the mechanism of natural convection, the warm ground surface heats the adjacent air, causing it to rise. The buoyant air rises up into the chimney of the plant, thereby drawing in more air at the collector perimeter and thus initiating forced convection which heats the collector air more rapidly. Through mixed convection, the warm collector air heats the underside of the collector roof. As the air flows from the collector perimeter towards the chimney its temperature increases while the velocity of the air stays approximately constant because of the increasing collector height. The heated air travels up the chimney, where it cools through the chimney walls. The chimney converts heat into kinetic energy. The pressure difference between the chimney base and ambient pressure at the outlet can be estimated from the density difference. 2. Problem statement it is necessary to develop the present renewable sources so that we can satisfy the demand. By using solar chimney we can produce the sufficient amount of Ventilation in rooms or in a factory. In this project CFD technology is used to investigate the changesinflowkinetic energy caused by the variation of tower flow area with height. So By changing collector area,chimneytower radius and height it can possible to get maximum efficiency with small change in design of solar chimney. Objectives: 1. To Design solar chimney by using CFD. 2. To Analyse solar chimney for mass flow rate. 3. To Analyse solar chimney for Passive ventilation system. 4. To Optimize Solar chimney to increase its efficiency. 3. Introduction to CFD Fluid dynamics deals with the dynamic behavior of fluids and its mathematical interpretation is called as Computational Fluid Dynamics. Fluid dynamics is governed by sets of partial differential equations, which in most cases are difficult or rather impossibletoobtainanalyticalsolution. CFD is a computational technology that enables the study of dynamics of things that flow.CFD provides a qualitative(and sometimes even quantitative) prediction of fluid flows by
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 4290 means of Mathematical modeling (partial differential equations) Numerical methods (discretization and solution techniques) Softwaretools(solvers,pre-andpost-processing utilities) CFD enables scientists and engineers to perform ‘numerical experiments’ (i.e. Computer simulations) in a ‘virtual flow laboratory’ real experiment CFD simulation. 4. CFD Analysis of Solar Chimney 4.1 Geometric Model Creation Geometries can be created using the pre-processorsoftware (Ansys-design modeler). XY plane is selected in design modeler. By using sketching option2Dsketchisdrawnandit is divided into 4 parts for meshing purpose. Geometry is freezed & it is converted into 3D by Revolve option. as shown in Fig Fig. 4.1 CFD Model of Solar chimney 4.2 Mesh generation No of elements is used for all the models 9 thousands. For the mesh generation special care hasbeentakentothezones close to the walls. In the proximity of the crest the mesh is finer than any other part of the domain. The domain has been subdivided into growing boxes to make it easier to generate the grid. The choice for the elements has been both Prism and hexahedral mesh volumes. Fig. 4.2 Close View of solar chimney mesh 4.3 Boundary conditions At the chimney inlet, the total heat flux on top wall is specified (800 N/mm2). For mass & momentum no slip wall is selected. Smooth wall is selected as wall roughness whereasatthetowerexitthe‘outlet’ condition with zero static pressure is prescribed. The symmetry boundary conditions are applied at the two sides of the sector while the adiabatic free- slip conditions are prescribed to the remaining boundaries, consistent with the frictionless flow assumption. All test cases were computed until residuals of all equations reached their respective minima. Moreover, global conservationof masswas rechecked to further ascertain convergence of the test cases. Inlet pressure 1000 Pa and inlet temp. 300K is selected. Ideal gas/air is selected as Flow material and Aluminum material is selected as Chimney material. Fig. 4.3 Boundary zone symmetry 1 Fig.4.4 Boundary zone Heat wall Fig.4.5 Boundary zone inlet
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 4291 Fig.4.6 Boundary zone Outlet 4.4 Observation table H Ro V max m/s Q=Ai.Vma x m3/sec ρ=P/g H m=Q. ρ 125 16 213 10707 0.94 10065 125 12 247 12462 0.90 11215 125 8 168 8455 1.52 12852 125 4 52 2649 0.96 2543 100 16 175 8832 0.98 8655 100 12 242 12195 0.94 11463 100 8 175 8817 1.17 10316 100 4 52 2642 0.89 2351 4.5 Results and Discusion A. For height of 125m and inlet radius 4m Graph .4.1 Outlet radius Ro Vs mass flow rate Graph .4.2 Outlet Radius Ro Vs maximum velocity V max B. For height of 100m and inlet radius 4m Graph 4.3 Outlet radius Ro Vs mass flow rate Graph 4.4 Outlet Radius Ro Vs maximum velocity V max 5. Conclusions a. We can design solar chimney according to requirement as follows. For maximum Velocity, Height = 125m, Outlet Radius = 12m, Inlet Radius = 4m For maximum Discharge, Height=125m,Outlet Radius = 12m, Inlet Radius = 4m For max. Mass flow rate, Height = 125m, Outlet Radius = 8m, Inlet Radius = 4m b. From the analysis we conclude that maximum mass flow rate can be achieved by using solar chimney of Height = 125m, Outlet Radius = 8m, Inlet Radius = 4m.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 4292 c. Maximum Mass flowratecan beachievedhence solar chimney can use solar chimney for passive Ventilation system. d. By using CFD Analysis we can identify the extra portion of height so that we can optimize it. Hence we can reduce height ofchimneyandcan reduce cost of chimney. ACKNOWLEDGMENT We would like to show our gratitude to the Dr. Shivajirao S. Jondhle (President Vighnaharata Trust’s), Mrs. Geetha Jondhle (secretory Vighnaharata Trust’s), Dr. (Mrs.) Geetha K. Jayaraj (Principal SSJCET Asangaon) for sharing their pearls of wisdom with us during the course of this research, and we thank Dr. Rajashekhar Sardagi (HOD Mechanical SSJCET Asangaon), Mr. Amol S.Dayma (ME-coordinator), Mr. Sanjay Kulkarni (ExamIncharge),Mr.AnweshVirkunvar and my colleagues for their so-called insights. REFERENCES [1] Bansal, N. K., Mathur, R., &Bhandari, M. S. (1994). A study of solar chimney assisted wind tower system for natural ventilation in buildings. Building and Environment, 29(4), 495-500. [2] Hamdy, I. F.,& Fikry, M. A. (1998). Passive solar ventilation. Renewable Energy, 14(1-4), 381-386. [3] Pasumarthi, N., &Sherif, S. A.(1998). Experimental and theoretical performance of a demonstration solar chimney model — Part I: mathematical model development. International Journal of Energy Research, 22(3), 277-288. [4] Gan, G., &Riffat, S. B. (1998). A numerical study of solar chimney for natural ventilation of buildings with heat recovery.Applied Thermal Engineering, 18(12), 1171-1187. [5] Coetzee, H. (1999). Design of a solar chimney to generate electricity employing a convergent nozzle. Botswana Technology Centre. [6] Hirunlabh, J., Wachirapuwadon, S., Pratinthong, N., &Khedari, J. (2001). New configurations of a roof solar collector maximizing natural ventilation. Building and Environment,36(3), 383- 391.. [7] Dai, Y. J., Huang, H. B., & Wang, R. Z. (2003). Case study of solar chimney power plants in Northwestern regions of China.Renewable Energy, 28(8), 1295-1304. [8] Ong, K. S., & Chow, C. C. (2003). Performance of a solar chimney. Solar energy, 74(1), 1-17. [9] Wong, N. H., &Heryanto, S. (2004). The study of active stack effect to enhance natural ventilation using wind tunnel and computational fluiddynamics (CFD) simulations. EnergyandBuildings, 36(7),668- 678. [10] Priyadarsini, R., Cheong, K. W., & Wong, N. H. (2004). Enhancement of natural ventilation in high - rise residential buildings using stack system. Energyand buildings, 36(1), 61-71. [11] Mathur, J., &Mathur, S.(2006).Summer-performance of inclined roof solar chimney for natural ventilation. Energy and Buildings, 38(10), 1156- 1163. [12] Mathur, J., Bansal, N. K., Mathur, S., & Jain, M. (2006). Experimental investigations on solar chimney for room ventilation. Solar Energy, 80(8), 927-935. [13] Zhou, X., Yang, J., Xiao, B., &Hou, G. (2007). Simulation of a pilot solar chimney thermal power generating equipment. Renewable Energy, 32(10), 1637-1644. [14] Bassiouny, R., & Koura, N. S. (2008). An analytical and numerical study of solar chimney use for room natural ventilation. Energyandbuildings, 40(5),865- 873. [15] Ming, T., Liu, W., Pan, Y., &Xu, G. (2008). Numerical analysis of flow and heat transfer characteristics in solar chimney power plants with energy storage layer. Energy Conversion and Management, 49(10), 2872-2879. [16] Zhou, X., Yang, J., Xiao, B., Hou, G., & Xing, F. (2009). Analysis of chimney height for solar chimney power plant. Applied Thermal Engineering, 29(1),178-185. [17] Arce, J., Jiménez, M. J., Guzmán, J. D., Heras, M. R., Alvarez, G., &Xamán, J. (2009). Experimental study for natural ventilation on a solar chimney. Renewable Energy,34(12), 2928-2934. [18] Maia, C. B., Ferreira, A. G., Valle, R. M., & Cortez, M. F. (2009). Theoretical evaluation of the influence of geometric parameters and materialsonthe behavior of the airflow in a solar chimney. Computers & Fluids, 38(3), 625-636. [19] Zhou, X., Xiao, B., Liu, W., Guo, X., Yang, J., & Fan, J. (2010). Comparisonofclassical solarchimneypower system and combined solar chimney system for power generation and seawater desalination. Desalination, 250(1), 249-256. [20] Koonsrisuk, A., Lorente, S., &Bejan, A. (2010). Constructal solar chimney configuration. International Journal of Heat and Mass Transfer, 53(1-3), 327-333. [21] Hamdan, M. O. (2011). Analysis of a solar chimney power plant in the Arabian Gulf region. Renewable Energy, 36(10), 2593-2598.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 4293 [22] Khanal, R., & Lei, C. (2011). Solar chimney—A passive strategy for natural ventilation. Energy and Buildings, 43(8), 1811-1819. [23] Hamdan, M. O., &Rabbata, O. (2012, May). Experimental solar chimney data with analytical model prediction. In Proceedings of the Solar Conference (Vol. 1, pp. 327-332). [24] Mehani, I., &Settou, N. (2012). Passive cooling of building by using solar chimney. World Academy of Science, Engineering and Technology International Journal of Civil, Environmental, Structural, Construction and Architectural Engineering, 6(9), 735-736. [25] Tan, A. Y. K., & Wong, N. H. (2012). Natural ventilation performance of classroom with solar chimney system. Energy and Buildings, 53, 19-27. [26] Saifi, N., Settou, N., Dokkar,B.,Negrou,B.,&Chennouf, N. (2012). Experimental study and simulation of airflow in solar chimneys. Energy Procedia, 18, 1289-1298. [27] Larbi, S., & El Hella, A. (2013). Thermo-fluid aspect analysis of passive cooling system case using solar chimney in the south regions of Algeria. Energy Procedia, 36, 628-637. [28] Sakir, M. T., Piash, M. B. K., &Akhter, M. S. (2014). Design, construction and performance testofa small solar chimney power plant. Global Journal of Research In Engineering. [29] Rahman, M. M., Chu, C. M., Kumaresen, S., Yan, F. Y., Kim, P. H., Mashud, M., &Rahman, M. S. (2014). Evaluation of the modified chimney performance to replace mechanical ventilation system for livestock housing. Procedia Engineering,90, 245-248. [30] Asante, D. (2014). The design of solar chimney power plant for sustainable power generation (Doctoral dissertation). [31] Zhang, K., Zhang, X., Li, S., & Wang, G. (2014). Numerical study on the thermal environment of UFAD system with solar chimney for the data center. Energy Procedia, 48, 1047-1054. [32] Li, J., & Li, D. (2015). The Study on Numerical Simulation of Classrooms Using Hybrid Ventilation Under Different Solar Chimney Radiation. Procedia Engineering, 121, 1083-1088. [33] Chantawong, P. (2017). Natural Ventilation Using Glazed Solar Chimney and Hot Water Collector Production. Energy Procedia, 138, 26-31. [34] Hu, S., & Leung, D. Y. (2017). Numerical Modelling of the Compressible Airflow in a Solar-Waste-Heat Chimney Power Plant. Energy Procedia, 142, 642- 647. [35] Hu, S., Leung, D. Y., & Chen, M. Z. (2017). Effect of Divergent Chimneys on the Performance of a Solar Chimney Power Plant. Energy Procedia, 105, 7-13. [36] Rattanongphisat, W., Imkong, P., &Khunkong, S. (2017). An Experimental InvestigationontheSquare Steel Solar Chimney for Building Ventilation Application. Energy Procedia, 138, 1165-1170. [37] Hu, S., & Leung, D. Y. (2017). Mathematical modelling of the performance of a solar chimney power plant with divergentchimneys. EnergyProcedia, 110,440- 445. [38] Mirhosseini, M., Rezania, A., &Rosendahl, L. (2017). View Factor of Solar Chimneys by Monte Carlo Method. Energy Procedia, 142, 513-518. [39] Zha, X., Zhang, J., & Qin, M. (2017). Experimental and Numerical Studies of Solar Chimney for Ventilation in Low Energy Buildings. Procedia Engineering, 205, 1612-1619.
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