Sensitivity of Thermal Stratification at the Number of Partition of a Storage Tank

11 Pages Posted: 24 Apr 2019 Last revised: 31 May 2019

See all articles by Toufik Chergui

Toufik Chergui

Centre de Développement des Energies Renouvelables (CDER)

Abdelhamid Boualit

Centre de Développement des Energies Renouvelables (CDER)

Mohamed Lebbi

Centre de Développement des Energies Renouvelables (CDER)

Mohamed Taher Bouzaher

Centre de Développement des Energies Renouvelables (CDER)

Salima Laouar

Centre de Développement des Energies Renouvelables (CDER)

Date Written: April 2, 2019

Abstract

This work is set in a series of studies on the influence of different geometrical and physical parameters on the quality of the thermo-hydrodynamic field via the thermal stratification that is installed in thermal energy storage tanks. The idea is based on the fact that undisturbed stratification considerably lengthens the charging/discharging period and therefore satisfies the user's requirements for this stored energy such as hot water. The purpose of this study is to be able to compare between the various configurations and thus to conclude on the optimal configuration before the realization phase. For an aspect ratio A ≤ 3, the central zone always shows the character of a stratification (stratified core), it occupies almost 50% of the enclosure. For 4 ≤ A ≤ 8, the central zone occupies almost 30 to 20% of the enclosure. The aspect ratio influence on the development and preservation (stabilization) of the stratification encouraged us to take advantage of its stratified core creation character but without modification of the shape of the storage tank nor its volume. In order to do this, we opted for a substantially high aspect ratio transformation that disadvantages stratification to a set of superimposed tanks of low aspect-ratio favoring stratification. However, the use of a partitioned configuration for improving the thermal stratification in a hot water storage tank may have originality in itself. In this work, we study the influence of partitions (number of partitions Np ranging from 0 to 7) on the appearance and destruction of stratification in the storage tank. The motion equations have been discretized into algebraic equations using a finite volume approach. To eliminate the pressure oscillations, we adopted the non-shifted grid approach (Colocated Grid) proposed by Rhie and Chow.

Keywords: storage tank, thermal stratification, charge/discharge, thermocline, obstacle plates

Suggested Citation

Chergui, Toufik and Boualit, Abdelhamid and Lebbi, Mohamed and Bouzaher, Mohamed Taher and Laouar, Salima, Sensitivity of Thermal Stratification at the Number of Partition of a Storage Tank (April 2, 2019). 2nd National Conference on Computational Fluid Dynamics & Technology 2018 (CFD & Tech 2018). Available at SSRN: https://ssrn.com/abstract=3376730 or http://dx.doi.org/10.2139/ssrn.3376730

Toufik Chergui (Contact Author)

Centre de Développement des Energies Renouvelables (CDER) ( email )

Ghardaia
Algeria

Abdelhamid Boualit

Centre de Développement des Energies Renouvelables (CDER) ( email )

Ghardaia
Algeria

Mohamed Lebbi

Centre de Développement des Energies Renouvelables (CDER) ( email )

Ghardaia
Algeria

Mohamed Taher Bouzaher

Centre de Développement des Energies Renouvelables (CDER) ( email )

Ghardaia
Algeria

Salima Laouar

Centre de Développement des Energies Renouvelables (CDER) ( email )

Ghardaia
Algeria

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