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Xavier Py - One of the best experts on this subject based on the ideXlab platform.

  • Numerical Study of a Structured Thermocline Storage Tank Using Vitrified Waste as Filler Material
    Energy Procedia, 2020
    Co-Authors: Fabrice Motte, S.l. Bugler-lamb, Quentin Falcoz, Xavier Py
    Abstract:

    Abstract Thermocline storage may be, today, the cheapest way to store solar thermal energy at high temperatures. Several estimations lead to a potential cost reduction of 35% compared to a two tank configuration while retaining a good efficiency. Thermocline tanks, in packed bed configurations, are mostly designed using Filler Materials to reduce the required amount of the expensive molten salt. The main problem of this technology is the thermal ratcheting which can lead to dramatic structural failure of the tank. One solution could be to use a structured bed configuration. With this goal, and as a part of the OPTS Project ( OP timization of a T hermal energy S torage system with integrated Steam Generator), after preliminary investigations driven by the necessity to have a low manufacturing cost, a brick design, made of industrial wastes, is proposed allowing both good thermal and mechanical properties. The implementation of the tank with the Filler Material of this geometry does not require a specific know- how other than building a classic wall. In order to study the behavior of the thermocline in this structured configuration, a numerical model is developed. A parametrical study was performed and the results are presented and discussed in this paper. The influences of the geometrical ratio of our ‘pattern’, of the physicals properties of the storage Material and of the flow rate of the solar salt inside the tank are characterized. The aim is to study the theoretical feasibility of a direct high temperature structured thermocline tank for concentrated solar power, using cheap Filler Materials.

  • compatibility of a post industrial ceramic with nitrate molten salts for use as Filler Material in a thermocline storage system
    Applied Energy, 2013
    Co-Authors: Nicolas Calvet, Judith C. Gomez, Abdessamad Faik, Vladimir V. Roddatis, Stefania Doppiu, Antoine Meffre, Greg C. Glatzmaier, Xavier Py
    Abstract:

    This paper demonstrates the potential of a post-industrial ceramic commercially called Cofalit® as a promising, sustainable, and cheap Filler Material in a molten salt direct thermocline storage system. This ceramic, which comes from industrial treatment of asbestos containing waste, demonstrates relevant properties to store thermal energy by sensible heat up to 1100°C and is very inexpensive. In the present study, the compatibility of this ceramic with two different molten salts—the conventional binary Solar salt and a promising ternary nitrate salt also called HITEC XL—is tested at medium temperature (500°C) under static state. The objective is to develop a molten salt thermocline direct storage system using low-cost shaped ceramic as Filler Material. It should significantly decrease the cost of parabolic trough storage systems and simultaneously increase the efficiency of the plants by producing superheated steam at higher temperature.

  • Compatibility of a post-industrial ceramic with nitrate molten salts for use as Filler Material in a thermocline storage system
    Applied Energy, 2013
    Co-Authors: Nicolas Calvet, Judith C. Gomez, Abdessamad Faik, Vladimir V. Roddatis, Stefania Doppiu, Antoine Meffre, Greg C. Glatzmaier, Xavier Py
    Abstract:

    This paper demonstrates the potential of a post-industrial ceramic commercially called Cofalit® as a promising, sustainable, and cheap Filler Material in a molten salt direct thermocline storage system. This ceramic, which comes from industrial treatment of asbestos containing waste, demonstrates relevant properties to store thermal energy by sensible heat up to 1100. °C and is very inexpensive. In the present study, the compatibility of this ceramic with two different molten salts-the conventional binary Solar salt and a promising ternary nitrate salt also called HITEC XL-is tested at medium temperature (500. °C) under static state. The objective is to develop a molten salt thermocline direct storage system using low-cost shaped ceramic as Filler Material. It should significantly decrease the cost of parabolic trough storage systems and simultaneously increase the efficiency of the plants by producing superheated steam at higher temperature. © 2013 Elsevier Ltd.

Jake Stephens - One of the best experts on this subject based on the ideXlab platform.

  • Experimental Investigation of Thermal Storage Processes in a Thermocline Tank
    Journal of Solar Energy Engineering, 2012
    Co-Authors: M. M. Valmiki, Wafaa Karaki, Jon Van Lew, Cholik Chan, Peiwen Li, Jake Stephens
    Abstract:

    This paper presents an experimental study of the energy charge and\ndischarge processes in a packed bed thermocline thermal storage tank for\napplication in concentrated solar power plants. A mathematical analysis\nwas provided for better understanding and planning of the experimental\ntests. The mathematical analysis indicated that the energy storage\neffectiveness is related to fluid and solid Material properties, tank\ndimensions, packing schemes of the solid Filler Material, and the\ndurations of the charge and discharge times. Dimensional analysis of the\ngoverning equations was applied to consolidate many parameters into a\nfew dimensionless parameters, allowing scaling from a laboratory system\nto an actual industrial application. Experiences on the system design,\npacking of solid Filler Material, system operation, and data analysis in\na laboratory-scale system have been obtained in this work. These data\nare used to validate a recently published numerical solution method. The\nstudy will benefit the application of thermocline thermal storage\nsystems in the large scale concentrated solar thermal power plants in\nindustry. {[}DOI: 10.1115/1.4006962]

  • analysis of heat storage and delivery of a thermocline tank having solid Filler Material
    Journal of Solar Energy Engineering-transactions of The Asme, 2011
    Co-Authors: Peiwen Li, Wafaa Karaki, Cholik Chan, Jake Stephens
    Abstract:

    Thermal storage has been considered as an important measure to extend the operation of a concentrated solar power plant by providing more electricity and meeting the peak demand of power in the time period from dusk to late night everyday, or even providing power on cloudy days. Discussed in this paper is thermal energy storage in a thermocline tank having a solid Filler Material. To provide more knowledge for designing and operating of such a thermocline storage system, this paper firstly presents the application of method of characteristics for numerically predicting the heat charging and discharging process in a packed bed thermocline storage tank. Nondimensional analysis of governing equations and numerical solution schemes using the method of characteristics were presented. The numerical method proved to be very efficient, accurate; required minimal computations; and proved versatile in simulating various operational conditions for which analytical methods cannot always provide solutions. Available analytical solutions under simple boundary and initial conditions were used to validate the numerical modeling and computation. A validation of the modeling by comparing the simulation results to experimental test data from literature also confirmed the effectiveness of the model and the related numerical solution method. Finally, design procedures using the numerical modeling tool were discussed and other issues related to operation of a thermocline storage system were also studied.

Xingke Zhao - One of the best experts on this subject based on the ideXlab platform.

  • Microstructures and mechanical properties of C f /SiC composite and TC4 alloy joints brazed with (Ti-Zr-Cu-Ni)+W composite Filler Materials
    Composites Science and Technology, 2014
    Co-Authors: Bing Cui, Chuang Cai, Jihua Huang, Shuhai Chen, Xingke Zhao
    Abstract:

    In this study, carbon fiber reinforced SiC (C f /SiC) composite was joined to TC4 alloy using (Ti-Zr-Cu-Ni)+W mixed powders as composite Filler Material at proper process parameters. The interfacial microstructures and evolution mechanism of C f /SiC composite/(Ti-Zr-Cu-Ni)+W/TC4 alloy joints were investigated based on scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD). The mechanical properties of the brazed joints were measured by the mechanical testing machine. The results showed that Ti and Zr elements in the interlayer can react with the brazed Material, the brazed joint mainly consisted of Ti 3 SiC 2 , Ti 5 Si 3 , (Ti, Zr)C, Ti 2 Cu, Cu 10 Zr 7 , Ti(Cu, Ni) and Ti(s,s) reaction products. The diffusion-reaction layer was formed between the interlayer and TC4 alloy due to the element interdiffusion. The brazing parameters had a distinct effect on the interfacial reaction between C f /SiC composite and Filler Material, which affected the shear strength of the brazed joints. Adding the appropriate W powder was beneficial for relaxing the residual thermal stress and reinforcing the brazed joints. The maximum shear strength of the brazed joints was 166MPa at room temperature and 96MPa at 800°C high temperature acquired at 930°C for 20min using (Ti-Zr-Cu-Ni)+15vol.%W composite Filler Material. © 2014 Elsevier Ltd.

H. Valiente - One of the best experts on this subject based on the ideXlab platform.

  • Colloidal silver nanoparticles: An effective nano-Filler Material to prevent fungal proliferation in bamboo
    RSC Advances, 2016
    Co-Authors: Omar Pandoli, R. D.s. Martins, E. C. Romani, SIDNEI PACIORNIK, M. H.d.p. Maurício, H. D.l. Alves, F. V. Pereira-meirelles, E. L. Luz, S. M.l. Koller, H. Valiente
    Abstract:

    Silver nanoparticles (Ag-NPs) are effective nano-Filler agents with antifungal activity able to improve bamboo's durability against fungus. Ag-NPs were used to fill up the bamboo biological matrix to obtain an engineered biocomposite Material. Silver nanoparticles (Ag-NPs) have attracted attention as a promising nano-Filler Material for reinforcement and anti-bacterial effect in polymers and composites. In this work bamboo samples, Dendrocalamus Giganteus Munro, were impregnated using a colloidal solution of homemade Ag-NPs with the goal of improving its resistance to attacks by fungi. X-ray microtomography (μCT) was performed to investigate the 3D distribution of Ag-NPs within the biological matrix. 3D image reconstruction showed silver clusters distributed within the parenchymatic tissue. Quantitative information of the Ag-NPs agglomerate population was computed. Ag-NPs were characterized by UV-VIS, SERS, ICP-MS, TSEM, DLS and zeta potential analysis. The antimicrobial activity of homemade and commercial citrate-capped silver nanoparticles was evaluated against the Aspergillus niger fungus. Homemade nanoparticles (NP-01), presenting the smallest diameter (14.3 ± 3.6 nm), and the highest particle concentration (1.25 × 10 11 particles per mL) were able to inhibit 53% of Aspergillus niger growth in a concentration of 2.00 mg L −1 . Both engineered biocomposite Material and untreated specimens were exposed to air and humidity. After five months the treated samples were free of fungal colonies, while colonization by the fungal hyphae was present on untreated bamboo specimens.

Tayfun Uygunoglu - One of the best experts on this subject based on the ideXlab platform.

  • effect of waste marble dust content as Filler on properties of self compacting concrete
    Construction and Building Materials, 2009
    Co-Authors: Ilker Bekir Topcu, Turhan Bilir, Tayfun Uygunoglu
    Abstract:

    Abstract Day by day, the amount of the marble dust (MD) as a waste Material is significantly of increasing in Turkey. Therefore, the utilization of the waste MD in self-compacting concrete (SCC), as Filler Material, is the main objective of this study. Besides, the MD is used directly without attempting any additional process. Thus, this would be another advantage for this objective. For this purpose, MD has replaced binder of SCC at certain contents of 0, 50, 100, 150, 200, 250 and 300 kg/m3. After then, slump-flow test, L-box test and V-funnel test are conducted on fresh concrete. Furthermore, compressive strength, flexural strength, ultrasonic velocity, porosity and compactness are determined at the end of 28 days for the hardened concrete specimens. The effect of waste MD usage as Filler Material on capillarity properties of SCC is also investigated. According to the test results, it is concluded that the workability of fresh SCC has not been affected up to 200 kg/m3 MD content. However, the mechanical properties of hardened SCC have decreased by using MD, especially just above 200 kg/m3 content.