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Belkacem Zeghmati - One of the best experts on this subject based on the ideXlab platform.
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Experimental study of the Sensible Heat Storage in the water/TiO 2 nanofluid enclosed in an annular space
Applied Thermal Engineering, 2017Co-Authors: Latifa El-kaddadi, Mohamed Asbik, Nadia Zari, Belkacem ZeghmatiAbstract:Abstract This article is devoted to an experimental study of Heat transfer during a Sensible Heat Storage cycle (charging/discharging) in a vertical cylindrical system. The experimental setup consists of two cylindrical tanks filled respectively with hot and cold water, a test bench, and measurement instruments. The test bench, thermally insulated with glass wool, is also composed of two vertical concentric tubes whose annular space contains the used nanofluid (the mixture of distilled water and titanium dioxide nanoparticles). The Heat transfer fluid (HTF) flows in the upward direction of the inner tube (HTF pipe). Adequate methods were used to prepare titanium dioxide nanoparticles for which the diameter is less than 20 nm. Both convective Heat transfer coefficient between external inner tube wall and nanofluid, and Heat flux densities during Storage cycle, were evaluated. The effect of nanofluid mass concentration (0.005, 0.01, 0.02 and 0.03 wt%) and the HTF mass flow rate on thermal Heat transfer coefficient and hence Heat flux densities were analyzed. Experimental results show that the average convective Heat transfer coefficient increases with increasing the mass flow rate, and it is improved by comparison with the fluid base (distilled water) when the nanofluid is considered. Furthermore, it has been observed that there is an optimal nanoparticles mass concentration corresponding to a maximal average convective Heat flux and also a maximal recovered Heat flux density. Consequently, convective Heat transfer coefficient has a strong influence on the Sensible Heat during a Storage cycle (charging/discharging).
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experimental study of the Sensible Heat Storage in the water tio 2 nanofluid enclosed in an annular space
Applied Thermal Engineering, 2017Co-Authors: Latifa Elkaddadi, Mohamed Asbik, Nadia Zari, Belkacem ZeghmatiAbstract:Abstract This article is devoted to an experimental study of Heat transfer during a Sensible Heat Storage cycle (charging/discharging) in a vertical cylindrical system. The experimental setup consists of two cylindrical tanks filled respectively with hot and cold water, a test bench, and measurement instruments. The test bench, thermally insulated with glass wool, is also composed of two vertical concentric tubes whose annular space contains the used nanofluid (the mixture of distilled water and titanium dioxide nanoparticles). The Heat transfer fluid (HTF) flows in the upward direction of the inner tube (HTF pipe). Adequate methods were used to prepare titanium dioxide nanoparticles for which the diameter is less than 20 nm. Both convective Heat transfer coefficient between external inner tube wall and nanofluid, and Heat flux densities during Storage cycle, were evaluated. The effect of nanofluid mass concentration (0.005, 0.01, 0.02 and 0.03 wt%) and the HTF mass flow rate on thermal Heat transfer coefficient and hence Heat flux densities were analyzed. Experimental results show that the average convective Heat transfer coefficient increases with increasing the mass flow rate, and it is improved by comparison with the fluid base (distilled water) when the nanofluid is considered. Furthermore, it has been observed that there is an optimal nanoparticles mass concentration corresponding to a maximal average convective Heat flux and also a maximal recovered Heat flux density. Consequently, convective Heat transfer coefficient has a strong influence on the Sensible Heat during a Storage cycle (charging/discharging).
P. Muthukumar - One of the best experts on this subject based on the ideXlab platform.
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Coupling strategy of multi-module high temperature solid Sensible Heat Storage system for large scale application
Applied Energy, 2020Co-Authors: K. Vigneshwaran, P. Muthukumar, Gurpreet Singh Sodhi, Anurag Guha, Senthilmurugan SubbiahAbstract:Abstract In the present study, a comprehensive coupling strategy is developed to evaluate the performance of multi-module Sensible Heat Storage system using a 1-D dynamic model. The experimentally validated 1-D dynamic model developed by authors research team has been adopted to scale-up the Heat Storage capacity for large scale application. Sensible Heat Storage modules having a multi-tube shell and tube configuration made of cast steel, cast iron and concrete materials have been employed. Air is considered as the Heat transfer fluid. Six flowsheet Cases are framed to evaluate the charging (493–573 K) and the discharging (373–573 K) coupling strategies connected in series and parallel arrangements. The cost of the net energy discharged (USD/kW-h) from each Case is evaluated. The result shows that the net energy discharge cost of Case 6 (with three parallel channels and two different Sensible Heat Storage modules in each channel) is highest (62.26 USD/kW-h). Case 3 (six concrete connected in the series arrangement) yields high Storage and discharge energy densities at a low cost of 1.18 USD/kW-h. The proposed flowsheet models are highly useful in studying the performance of different Storage materials coupled in different arrangements for developing a low cost and high energy density Sensible Heat Storage system.
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Performance investigation of lab-scale Sensible Heat Storage prototypes
International Journal of Green Energy, 2019Co-Authors: Chilaka Ravi Chandra Rao, K. Vigneshwaran, Hakeem Niyas, P. MuthukumarAbstract:ABSTRACTThis paper presents the performance investigation of three lab-scale solid Sensible Heat Storage (SHS) prototypes. The prototypes analyzed are of shell-and-tube type configuration, in which...
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performance tests on lab scale Sensible Heat Storage prototypes
Applied Thermal Engineering, 2018Co-Authors: Chilaka Ravi Chandra Rao, Hakeem Niyas, P. MuthukumarAbstract:Abstract This paper presents the performance tests on lab-scale Sensible Heat Storage (SHS) prototypes made up of cast steel and concrete. Thermal Storage performances of the prototypes in terms of charging/discharging times and energy Storage/discharge rates have been estimated at various operating temperatures and Heat transfer fluid (HTF) flow rates. These prototypes were designed in the form of a shell-and-tube type Heat exchanger with a Heat Storage capacity of 15 MJ. Five different concrete mix designs were studied and the mix design M30 was selected for thermal Storage, as they possess high compressive strength-cost ratio. Heat transfer enhancement in the concrete prototypes was incorporated by welding longitudinal fins on the HTF tubes. Hi-tech Therm 60 was used as Heat transfer fluid. The charging and discharging times of cast steel (M1) prototype in the temperature range of 353–413 K were 1263 and1803 s, respectively. The effective charging/discharging time of the concrete prototype with copper tubes (M2) and concrete prototype with MS tubes (M3) prototypes in the temperature range of 353–433 K were 5210/6297 s and 7160/7780 s, respectively. The Storage performance of the system highly depends on the operating temperature range due to the temperature dependence of the thermo-physical properties of the SHS materials and the HTF.
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Performance tests on lab–scale Sensible Heat Storage prototypes
Applied Thermal Engineering, 2018Co-Authors: Chilaka Ravi Chandra Rao, Hakeem Niyas, P. MuthukumarAbstract:Abstract This paper presents the performance tests on lab-scale Sensible Heat Storage (SHS) prototypes made up of cast steel and concrete. Thermal Storage performances of the prototypes in terms of charging/discharging times and energy Storage/discharge rates have been estimated at various operating temperatures and Heat transfer fluid (HTF) flow rates. These prototypes were designed in the form of a shell-and-tube type Heat exchanger with a Heat Storage capacity of 15 MJ. Five different concrete mix designs were studied and the mix design M30 was selected for thermal Storage, as they possess high compressive strength-cost ratio. Heat transfer enhancement in the concrete prototypes was incorporated by welding longitudinal fins on the HTF tubes. Hi-tech Therm 60 was used as Heat transfer fluid. The charging and discharging times of cast steel (M1) prototype in the temperature range of 353–413 K were 1263 and1803 s, respectively. The effective charging/discharging time of the concrete prototype with copper tubes (M2) and concrete prototype with MS tubes (M3) prototypes in the temperature range of 353–433 K were 5210/6297 s and 7160/7780 s, respectively. The Storage performance of the system highly depends on the operating temperature range due to the temperature dependence of the thermo-physical properties of the SHS materials and the HTF.
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Design and optimization of lab-scale Sensible Heat Storage prototype for solar thermal power plant application
Solar Energy, 2013Co-Authors: Likhendra Prasad, P. MuthukumarAbstract:Abstract This paper deals with the numerical investigation of transient behavior and thermal Storage capability of a Sensible Heat Storage unit designed for storing Heat in the temperature range of 523–673 K. A Heat Storage unit of cylindrical configuration with embedded charging tubes has been designed employing three Storage materials viz., concrete, cast steel and cast iron. To investigate their Heat Storage characteristics, a finite element based 3-D mathematical model has been developed using COMSOL Multiphysics 4.2. The number of embedded charging tubes in the bed has been optimized based on the charging time of Storage bed. Numerically predicted results match closely with the data reported in the literature. Performances of the thermal Storage bed of capacity of 10 MJ (including charging time, energy Storage rate, charging energy efficiency) have been evaluated for the selected three Storage materials. The parametric studies are carried out by varying the number of fins on the charging tubes and the Heat transfer fluid flow rate. The reductions in charging time are 35.48% (charging time 1307 s) for four fins case and 41.41% (charging time 1187 s) for six fins case as compared to concrete bed with plain charging tubes. For cast iron and cast steel Storage beds, the increase in velocity of Heat transfer fluid causes the reduction in charging time by the almost same factor while this effect in concrete is less because of comparatively lower thermal conductivity and higher Heat capacity.
Wolf-dieter Steinmann - One of the best experts on this subject based on the ideXlab platform.
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The CellFlux Storage Concept for Increased Flexibility in Sensible Heat Storage
Energy Procedia, 2015Co-Authors: Christian Odenthal, Wolf-dieter Steinmann, Markus EckAbstract:Abstract Packed beds using air at atmospheric pressure as Heat transferringmedium are the most cost effective systems for Sensible Heat Storage. The basic idea of the CellFlux concept is to apply this concept also for liquid and/or pressurized primary HTFs by the introduction of an intermediate working fluid cycle. A Heat exchanger is used for transferring energy between the primary HTF and the intermediate air cycle which eventually transfers the energy to a packed bed. The CellFlux concept can be implemented by using standard components. Essential is the minimization of efficiency losses resulting from the circulation of the air as well as the Heat transfer processes within the Heat exchanger and the Storage volume. Some example cost estimations for the Heat exchanger are given. The feasibility of the CellFlux concept has been proven by a pilot scale test facility operated at a maximum temperature of 380 °C and 100 kW. A novel approach promising further cost reductions has been applied by realizing a horizontal flow direction. Results from the theoretical and experimental analysis of the CellFlux concept will be presented. Distinctive for the CellFlux concept is the flexibility regarding working fluid (thermal oil, molten salt, pressurized water, CO 2 ), temperature range (0-800 °C), power (kW-multi MW) and Storage medium (rocks, clinker bricks, concrete). This allows a wide range of applications. An example for application in combined Heat and power will be given.
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The CellFlux Concept as an Alternative Solution for Sensible Heat Storage
Energy Procedia, 2015Co-Authors: Christian Odenthal, Wolf-dieter Steinmann, Markus EckAbstract:The CellFlux concept is a new Sensible Storage system where thermal energy from a primary working fluid (HTF) is transferred to an intermediate working fluid (IWF) which flows in direct contact through a cost effective packed bed solid Sensible Storage material. The IWF is kept in a closed loop, conveyed by a fan. It is possible to combine multiple Storage modules to a large system. The paper presents the results of the analysis of a single Storage cell. Various options for the combination of Storage cells in a Storage unit are described; the importance of the concept selected for the integration of the Storage unit into the power plant is shown. The combination of CellFlux with molten salt HTFs is introduced and results from cost estimations are given.
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Sensible Heat Storage for Medium and High Temperatures
Proceedings of ISES World Congress 2007 (Vol. I – Vol. V), 2008Co-Authors: Doerte Laing, Wolf-dieter Steinmann, Rainer TammeAbstract:Storage systems using Sensible Heat Storage have been developed for operation temperatures up to 400°C. These systems are intended for integration into solarthermal power plants demanding Storage capacities in the MWh-range. Research has been focused on the development of cost effective Storage systems using concrete with embedded Heat exchangers. Various options for improving the Heat transport within the Storage material have been investigated.
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advanced thermal energy Storage technology for parabolic trough
Journal of Solar Energy Engineering-transactions of The Asme, 2004Co-Authors: Rainer Tamme, Doerte Laing, Wolf-dieter SteinmannAbstract:The availability of Storage capacity plays an important role for the economic success of solar thermal power plants. For today's parabolic trough power plants, Sensible Heat Storage systems with operation temperatures between 300°C and 390°C can be used. A solid media Sensible Heat Storage system is developed and will be tested in a parabolic trough test loop at PSA, Spain. A simulation tool for the analysis of the transient performance of solid media Sensible Heat Storage systems has been implemented. The computed results show the influence of various parameters describing the Storage system. While the effects of the Storage material properties are limited, the selected geometry of the Storage system is important. The evaluation of a Storage system demands the analysis of the complete power plant and not only of the Storage unit. Then the capacity of the system is defined by the electric work produced by the power plant, during a discharge process of the Storage unit. The choice of the operation strategy for the Storage system proves to be essential for the economic optimization.
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advanced thermal energy Storage technology for parabolic trough
Solar Energy, 2003Co-Authors: Rainer Tamme, Doerte Laing, Wolf-dieter SteinmannAbstract:The availability of Storage capacity plays an important role for the economic success of solar thermal power plants. For today’s parabolic trough power plants, Sensible Heat Storage systems with operation temperatures between 300°C and 390°C can be used. A solid media Sensible Heat Storage system is developed and will be tested in a parabolic trough test loop at PSA, Spain. A simulation tool for the analysis of the transient performance of solid media Sensible Heat Storage systems has been implemented. The computed results show the influence of various parameters describing the Storage system. While the effects of the Storage material properties are limited, the selected geometry of the Storage system is important. The evaluation of a Storage system demands the analysis of the complete power plant and not only of the Storage unit. Then the capacity of the system is defined by the electric work produced by the power plant, during a discharge process of the Storage unit. The choice of the operation strategy for the Storage system proves to be essential for the economic optimization.Copyright © 2003 by ASME
Mohamed Asbik - One of the best experts on this subject based on the ideXlab platform.
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Experimental study of the Sensible Heat Storage in the water/TiO 2 nanofluid enclosed in an annular space
Applied Thermal Engineering, 2017Co-Authors: Latifa El-kaddadi, Mohamed Asbik, Nadia Zari, Belkacem ZeghmatiAbstract:Abstract This article is devoted to an experimental study of Heat transfer during a Sensible Heat Storage cycle (charging/discharging) in a vertical cylindrical system. The experimental setup consists of two cylindrical tanks filled respectively with hot and cold water, a test bench, and measurement instruments. The test bench, thermally insulated with glass wool, is also composed of two vertical concentric tubes whose annular space contains the used nanofluid (the mixture of distilled water and titanium dioxide nanoparticles). The Heat transfer fluid (HTF) flows in the upward direction of the inner tube (HTF pipe). Adequate methods were used to prepare titanium dioxide nanoparticles for which the diameter is less than 20 nm. Both convective Heat transfer coefficient between external inner tube wall and nanofluid, and Heat flux densities during Storage cycle, were evaluated. The effect of nanofluid mass concentration (0.005, 0.01, 0.02 and 0.03 wt%) and the HTF mass flow rate on thermal Heat transfer coefficient and hence Heat flux densities were analyzed. Experimental results show that the average convective Heat transfer coefficient increases with increasing the mass flow rate, and it is improved by comparison with the fluid base (distilled water) when the nanofluid is considered. Furthermore, it has been observed that there is an optimal nanoparticles mass concentration corresponding to a maximal average convective Heat flux and also a maximal recovered Heat flux density. Consequently, convective Heat transfer coefficient has a strong influence on the Sensible Heat during a Storage cycle (charging/discharging).
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experimental study of the Sensible Heat Storage in the water tio 2 nanofluid enclosed in an annular space
Applied Thermal Engineering, 2017Co-Authors: Latifa Elkaddadi, Mohamed Asbik, Nadia Zari, Belkacem ZeghmatiAbstract:Abstract This article is devoted to an experimental study of Heat transfer during a Sensible Heat Storage cycle (charging/discharging) in a vertical cylindrical system. The experimental setup consists of two cylindrical tanks filled respectively with hot and cold water, a test bench, and measurement instruments. The test bench, thermally insulated with glass wool, is also composed of two vertical concentric tubes whose annular space contains the used nanofluid (the mixture of distilled water and titanium dioxide nanoparticles). The Heat transfer fluid (HTF) flows in the upward direction of the inner tube (HTF pipe). Adequate methods were used to prepare titanium dioxide nanoparticles for which the diameter is less than 20 nm. Both convective Heat transfer coefficient between external inner tube wall and nanofluid, and Heat flux densities during Storage cycle, were evaluated. The effect of nanofluid mass concentration (0.005, 0.01, 0.02 and 0.03 wt%) and the HTF mass flow rate on thermal Heat transfer coefficient and hence Heat flux densities were analyzed. Experimental results show that the average convective Heat transfer coefficient increases with increasing the mass flow rate, and it is improved by comparison with the fluid base (distilled water) when the nanofluid is considered. Furthermore, it has been observed that there is an optimal nanoparticles mass concentration corresponding to a maximal average convective Heat flux and also a maximal recovered Heat flux density. Consequently, convective Heat transfer coefficient has a strong influence on the Sensible Heat during a Storage cycle (charging/discharging).
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Experimental study of Sensible Heat Storage/retrieval in/from a nanofluid enclosed between concentric annular tubes
Energy Procedia, 2017Co-Authors: Latifa El-kaddadi, Mohamed Asbik, Nadia Zari, Omar Zegaoui, Abdellah BahAbstract:Abstract In this work, an experimental study has been carried out to quantify an amount of Sensible Heat Storage/recovery in a specific nanofluid (distilled water +Titanium dioxide). The experimental results show, especially, the influence of nanoparticles mass concentration on the Heat Storage/recovery performance for a fixed mass flow rate (Γ= 300 kg/ℎ) of Heat transfer fluid (HTF). This parameter contributes to the improvement of the Heat transfer and therefore the enhancement of the Sensible Heat Storage/retrieval.
Nadia Zari - One of the best experts on this subject based on the ideXlab platform.
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Experimental study of the Sensible Heat Storage in the water/TiO 2 nanofluid enclosed in an annular space
Applied Thermal Engineering, 2017Co-Authors: Latifa El-kaddadi, Mohamed Asbik, Nadia Zari, Belkacem ZeghmatiAbstract:Abstract This article is devoted to an experimental study of Heat transfer during a Sensible Heat Storage cycle (charging/discharging) in a vertical cylindrical system. The experimental setup consists of two cylindrical tanks filled respectively with hot and cold water, a test bench, and measurement instruments. The test bench, thermally insulated with glass wool, is also composed of two vertical concentric tubes whose annular space contains the used nanofluid (the mixture of distilled water and titanium dioxide nanoparticles). The Heat transfer fluid (HTF) flows in the upward direction of the inner tube (HTF pipe). Adequate methods were used to prepare titanium dioxide nanoparticles for which the diameter is less than 20 nm. Both convective Heat transfer coefficient between external inner tube wall and nanofluid, and Heat flux densities during Storage cycle, were evaluated. The effect of nanofluid mass concentration (0.005, 0.01, 0.02 and 0.03 wt%) and the HTF mass flow rate on thermal Heat transfer coefficient and hence Heat flux densities were analyzed. Experimental results show that the average convective Heat transfer coefficient increases with increasing the mass flow rate, and it is improved by comparison with the fluid base (distilled water) when the nanofluid is considered. Furthermore, it has been observed that there is an optimal nanoparticles mass concentration corresponding to a maximal average convective Heat flux and also a maximal recovered Heat flux density. Consequently, convective Heat transfer coefficient has a strong influence on the Sensible Heat during a Storage cycle (charging/discharging).
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experimental study of the Sensible Heat Storage in the water tio 2 nanofluid enclosed in an annular space
Applied Thermal Engineering, 2017Co-Authors: Latifa Elkaddadi, Mohamed Asbik, Nadia Zari, Belkacem ZeghmatiAbstract:Abstract This article is devoted to an experimental study of Heat transfer during a Sensible Heat Storage cycle (charging/discharging) in a vertical cylindrical system. The experimental setup consists of two cylindrical tanks filled respectively with hot and cold water, a test bench, and measurement instruments. The test bench, thermally insulated with glass wool, is also composed of two vertical concentric tubes whose annular space contains the used nanofluid (the mixture of distilled water and titanium dioxide nanoparticles). The Heat transfer fluid (HTF) flows in the upward direction of the inner tube (HTF pipe). Adequate methods were used to prepare titanium dioxide nanoparticles for which the diameter is less than 20 nm. Both convective Heat transfer coefficient between external inner tube wall and nanofluid, and Heat flux densities during Storage cycle, were evaluated. The effect of nanofluid mass concentration (0.005, 0.01, 0.02 and 0.03 wt%) and the HTF mass flow rate on thermal Heat transfer coefficient and hence Heat flux densities were analyzed. Experimental results show that the average convective Heat transfer coefficient increases with increasing the mass flow rate, and it is improved by comparison with the fluid base (distilled water) when the nanofluid is considered. Furthermore, it has been observed that there is an optimal nanoparticles mass concentration corresponding to a maximal average convective Heat flux and also a maximal recovered Heat flux density. Consequently, convective Heat transfer coefficient has a strong influence on the Sensible Heat during a Storage cycle (charging/discharging).
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Experimental study of Sensible Heat Storage/retrieval in/from a nanofluid enclosed between concentric annular tubes
Energy Procedia, 2017Co-Authors: Latifa El-kaddadi, Mohamed Asbik, Nadia Zari, Omar Zegaoui, Abdellah BahAbstract:Abstract In this work, an experimental study has been carried out to quantify an amount of Sensible Heat Storage/recovery in a specific nanofluid (distilled water +Titanium dioxide). The experimental results show, especially, the influence of nanoparticles mass concentration on the Heat Storage/recovery performance for a fixed mass flow rate (Γ= 300 kg/ℎ) of Heat transfer fluid (HTF). This parameter contributes to the improvement of the Heat transfer and therefore the enhancement of the Sensible Heat Storage/retrieval.
