Experimental testing of fluidized bed thermal storage

Elsayed, Moustafa M.; Megahed, I. E. A.; El–Refaee, M. M.

doi:10.1016/0741-983x(88)90086-0

Cited by 14 publications

(15 citation statements)

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“…1-3, one concludes that the numerical results compare very good with the experimental results of reference [6]. It should be noted that the numerical results are found to be slightly higher than the experimental data.…”

Section: Solution Proceduressupporting

confidence: 59%

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Parametric study on fluidized bed thermal storage

El–Refaee

Elsayed

Megahed

1988

Wärme- und Stoffübertragung

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Abstract. In the present work, the numerical model developed earlier by the same authors [5] is refined and recast in non-dimensional form. The refined model is calibrated with recent experiments at different bed air-inlet temperatures. Excellent agreement between the numerical results and experiments is obtained.The refined model is then used to conduct an extensive parametric study. The objectives of the parametric study are: (i) to determine the effect of the non-dimensional parameters (0(2, C( 3 and 0(,) on the bed performance; (ii) to indicate the conditions required for favourable bed operation, and (iii) to compare the fluidized-bed performance with a small-particle packed bed performance.The numerical results are presented as time-histories of average bed temperature (Oh) and bed efficiency (t/). The performance histories are given for different value of each parameter (0(2, 0(3, and 0(4). The study shows that the fluidized bed behaves favourably for 0(2 < 10, % > 30 and 0(4 < 10. Moreover, it was concluded that the small particle packed bed, in general, offers better performance behaviour over a fluidized bed having the same bed size and heat input. Parameterstudie fiber die Wfirmespeicherung in einem WirbelbettZusammenfassung. In der vorliegenden Arbeit wird das numerische Modell fiber die Wfirmespeicherung in einem Wirbelbett der oben genannten Autoren [5] verbessert und in eine dimensionslose Form umgearbeitet. Das verbesserte Modell basiert auf neuere Experimente bei unterschiedlichen Lufteintrittstemperaturen. Zwischen den numerischen und den experimentellen Ergebnissen wird eine sehr gute Ubereinstimmung erzielt. Das neue Modell wird fiir die Durchfiihrung einer ausfiihrlichen Parameterstudie verwendet. Damit soll der EinfluB der dimensionslosen Parameter (0(2, 0(3 und 0(4) auf die Leistung des Wirbelbettes bestimmt, sowie die Bedingungen ftir eine giinstige Arbeitsweise des Bettes aufgezeigt, und die Leistung des Wirbelbettes mit der eines Festbettes zu verglichen werden. Die numerischen Ergebnisse werden anhand des zeitlichen Verlaufes der Bett-Temperatur (0b) und des Bett-Wirkungsgrades (t/) dargestellt. Der Leistungsverlauf wird fiir verschiedene Werte der einzelnen Parameter (0(2, 0(3 und c~4) angegeben. Die Studie zeigt, dab das Wirbelbett sich ffir 0(2 < 10, % > 30 und 0(4 < 10 am giinstigsten verh/ilt. Ferner kam man zu dem Ergebnis, dab das Festbett im allgemeinen bei gleicher Bettgrff3e und gleicher Wfirmezufuhr ein besseres Leistungsverhalten bietet.

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Section: Solution Proceduressupporting

confidence: 59%

“…The present one-dimensional, two phase model (ODTPM) is used to conduct this sludy, In order to demonstrate the ability of the present m( effect of a wide range of different param performance, a number of numerical tests different bed air inlet temperatures. The compared with the most recent experime Sayed et al [6].…”

Section: Introductionmentioning

confidence: 93%

Parametric study on fluidized bed thermal storage

El–Refaee

Elsayed

Megahed

1988

Wärme- und Stoffübertragung

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“…To analyze the experiments, two parameters were studied: the storage efficiency during the charging process, η C , and the recovery efficiency of the discharging process, η R [6,22].…”

Section: Resultsmentioning

confidence: 99%

“…The application of fluidized beds to sensible heat storage has been studied in the past, and it has been shown that a fluidized bed behaves similarly to a well-mixed tank with negligible variations in the temperature along the bed [6]. Wagialla et al [7] modelled the behavior of a fluidized bed and showed that the optimum performance of the fluidized bed, when it was used as an energy storage device, was achieved by employing a superficial air velocity similar to the minimum fluidization velocity.…”

Section: Introductionmentioning

confidence: 99%

Thermal energy storage in a fluidized bed of PCM

Izquierdo-Barrientos

Sobrino

Almendros-Ibáñez

2013

Chemical Engineering Journal

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The objective of the present work was to research the storage behavior of a fluidized bed filled with a granular phase change material (PCM) with a small particle diameter (d p = 0.54 mm). The performance of the fluidized bed was compared to that of well-known storage methods such as fluidized beds with sand and packed beds based of sand and PCM. For this purpose, heating experiments were conducted in a cylindrical bed with air as the working fluid.The influence of the bed height and flow rate on the storage and recovery efficiencies of the fluidized bed of PCM was analyzed. Additionally, the stability of the PCM during various charging-discharging cycles was studied.The results indicate that this PCM is an alternative material that can be used in fluidized bed systems to increase the efficiency of storing thermal * Corresponding author. NOTICE: this is the author's version of a work that was accepted for publication in Chemical Engineering Journal. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. The cycling test shows that the PCM is stable under bubbling conditions up to 15 cycles, which corresponds to approximately 75 hours of continuous operation. A definitive version was subsequently published in Chemical Engineering

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“…Elsayed et al [4] tested an air-sand fluidized bed for thermal storage, in which the bed was heated or cooled by a flow of air. They observed that the bed always behaves as a well mixed tank.…”

Section: Introductionmentioning

confidence: 99%

Energy storage with PCM in fluidized beds: Modeling and experiments

Izquierdo-Barrientos¹,

Sobrino²,

Almendros-Ibáñez³

2015

Chemical Engineering Journal

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In recent years, the development of phase change materials (PCMs) has introduced new ways to increase the energy storage capacity of a system due to the high latent heat and high storage density of these materials. The aim of this work is to model the charging process of a fluidized bed with PCMs operating as an energy storage device. The temperature in the bed during the charging process of the fluidized bed has been modeled using the two phase theory of fluidization. The dense phase is taken to be perfectly mixed, and the bubble phase is taken to be in plug flow. The numerical model presented takes into account the fact that the phase change process of the bed material occurs over a temperature range and also estimates the energy stored in the wall of the bed and in the distributor plate. The energy equation of the dense phase is numerically solved in enthalpy form, considering the depen- * Corresponding author. NOTICE: this is the author's version of a work that was accepted for publication in Chemical Engineering Journal. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Chemical Engineering

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Experimental testing of fluidized bed thermal storage

Cited by 14 publications

References 1 publication

Parametric study on fluidized bed thermal storage

Parametric study on fluidized bed thermal storage

Thermal energy storage in a fluidized bed of PCM

Energy storage with PCM in fluidized beds: Modeling and experiments

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