Parametric and Analysis Study of the Melting in Slabs Heated by a Laminar Heat Transfer Fluid in Downward and Upward Flows
The present work aims to investigate numerically the thermal and flow characteristics of a rectangular latent heat storage unit (LHSU) during the melting process of a phase change material (PCM). The LHSU consists of a number of vertical and identical plates of PCM separated by rectangular channels. The melting process is initiated when the LHSU is heated by a heat transfer fluid (HTF: water) flowing in channels in a downward or upward direction. The proposed study is motivated by the need to optimize the thermal performance of the LHSU by accelerating the charging process. A mathematical model is developed and a fixed-grid enthalpy formulation is adopted for modeling the melting process coupling with convection-conduction heat transfer. The finite volume method was used for discretization. The obtained numerical results are compared with experimental, analytical and numerical ones found in the literature and reasonable agreement is obtained. Thereafter, the numerical investigations were carried out to highlight the effects of the HTF flow direction and the aspect ratio of the PCM slabs on the heat transfer characteristics and thermal performance enhancement of the LHSU.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1130337Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 477
 F. Kuznik, J. Virgone, "Experimental assessment of a phase change material for wall building use," Applied Energy, (2009), pp. 2038-2046.
 W. Xiao, X. Wang, Y. Zhang, "Analytical optimization of interior PCM for energy storage in a lightweight passive solar room," Applied Energy, (2009), pp. 2013-2018.
 C. Garnier, J. Currie, T. Muneer, "Integrated collector storage solar water heater: Temperature stratification," Applied Energy, (2009), pp. 1465-1469.
 K. Sutthivirode, P. Namprakai, N. Roonprasang, "A new version of a solar water heating system coupled with a solar water pump," Applied Energy, (2009), pp. 1423-1430.
 Z.D. Cheng, Y.L. He, J. Xiao, Y.B. Tao, R.J. Xu, "Three-dimensional numerical study of heat transfer characteristics in the receiver tube of parabolic trough solar collector," International Communications in Heat and Mass Transfer, (2010), pp. 782-787.
 D. Brosseau, J.W. Kelton, D. Ray, M. Edgar, "Testing of Thermocline Filler Materials and Molten-Salt Heat Transfer Fluids for Thermal Energy Storage Systems in Parabolic Trough Power Plants," J. Sol. Energy Eng., (2005), pp. 8.
 Y.-L. He, J. Xiao, Z.-D. Cheng, Y.-B. Tao, "A MCRT and FVM coupled simulation method for energy conversion process in parabolic trough solar collector," Renewable Energy, (2011), pp. 976-985.
 Y.B. Tao, Y.L. He, "Numerical study on coupled fluid flow and heat transfer process in parabolic trough solar collector tube," Solar Energy, (2010), pp. 1863-1872.
 Z. Yang, S.V. Garimella, "Molten-salt thermal energy storage in thermoclines under different environmental boundary conditions," Applied Energy, (2010), pp. 3322-3329.
 P. Charvát, L. Klimeš, M. Ostrý, "Numerical and experimental investigation of a PCM-based thermal storage unit for solar air systems," Energy and Buildings, (2014), pp. 488-497.
 A.H. Mosaffa, C.A. Infante Ferreira, F. Talati, M.A. Rosen, "Thermal performance of a multiple PCM thermal storage unit for free cooling," Energy Conversion and Management, (2013), pp. 1-7.
 M. Bechiri, K. Mansouri, "Exact solution of thermal energy storage system using PCM flat slabs configuration," Energy Conversion and Management, (2013), pp. 588-598.
 J. P. A. Lopez, F. Kuznik, D. Baillis, J. Virgone, "Numerical modeling and experimental validation of a PCM to air heat exchanger," Energy and Buildings, (2013), pp. 415-422.
 E. Halawa, W. Saman, "Thermal performance analysis of a phase change thermal storage unit for space heating," Renewable Energy, (2011), pp. 259-264.
 W.-B. Ye, D.-S. Zhu, N. Wang, "Fluid flow and heat transfer in a latent thermal energy unit with different phase change material (PCM) cavity volume fractions," Applied Thermal Engineering, (2012), pp. 49-57.
 M. Gharebaghi, I. Sezai, "Enhancement of heat transfer in latent heat storage modules with internal fins," Numerical Heat Transfer, Part A: Applications, (2007), pp. 749-765.
 J. Borderon, J. Virgone, R. Cantin, "Modeling and simulation of a phase change material system for improving summer comfort in domestic residence," Applied Energy, (2015), pp. 288-296.
 A. Lazaro, P. Dolado, J.M. Marín, B. Zalba, "PCM–air heat exchangers for free-cooling applications in buildings: Experimental results of two real-scale prototypes," Energy Conversion and Management, (2009), pp. 439-443.
 H. El Qarnia, "Theoretical study of transient response of a rectangular latent heat thermal energy storage system with conjugate forced convection," Energy Conversion and Management, (2004), pp. 1537-1551.
 H. Ait Adine, H. El Qarnia, "Numerical analysis of the thermal behaviour of a shell-and-tube heat storage unit using phase change materials," Applied Mathematical Modelling, (2009), pp. 2132-2144.
 R. Elbahjaoui, H. El Qarnia, "Transient behavior analysis of the melting of nanoparticle-enhanced phase change material inside a rectangular latent heat storage unit," Applied Thermal Engineering, (2017), pp. 720-738.
 W.-W. Wang, K. Zhang, L.-B. Wang, Y.-L. He, "Numerical study of the heat charging and discharging characteristics of a shell-and-tube phase change heat storage unit," Applied Thermal Engineering, (2013), pp. 542-553.
 R. Elbahjaoui, H. El Qarnia, "Numerical Study of a Shell-and-Tube Latent Thermal Energy Storage Unit Heated by Laminar Pulsed Fluid Flow" Heat Transfer Engineering, (2016).
 A. Laouadi, M. Lacroix, "Thermal performance of a latent heat energy storage ventilated panel for electric load management," International Journal of Heat and Mass Transfer, (1999), pp. 275-286.
 K.-G. Kang, H.-S. Ryou, "Computation of solidification and melting using the PISO algorithm," Numerical Heat Transfer, Part B: Fundamentals, (2004), pp. 179-194.
 S.V. Patankar, Numerical Heat Transfer and Fluid Flow, Hemisphere Publishing Corporation, New York, 1980.