Computer simulation of stratified heat storage

Oppel, Fred; Ghajar, Afshin J.; Moretti, P. M.

doi:10.1016/0306-2619(86)90055-3

Cited by 33 publications

(18 citation statements)

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“…Oppel et al (1986), Homan et al (1996), Rodriguez et al (2002), oon et al (2003) and Shin et al (2003) developed different computer odels in order to study the thermal stratification mechanism in storage nks, and thereby determine the optimum design and operating condions. However, since the aim of their work was to investigate thermal torage tanks used in thermal solar systems, the results were not directly pplicable when analysing the hot water system for a residential CO 2 heat p. Most of the calculations were carried out for a static system without inlet and outlet water flows, and the DHW tank was either filled with hot water or with equal volumes of hot water and cold city water.…”

Section: S 2mentioning

confidence: 99%

Residential CO2 heat pump system for combined space heating and hot water heating

Stene

2005

International Journal of Refrigeration

146

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Section: S 2mentioning

confidence: 99%

Residential CO2 heat pump system for combined space heating and hot water heating

Stene

2005

International Journal of Refrigeration

146

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“…The one-dimensional model taken here accounts for both turbulent intermixing (Zurigat et al, 1989;Ghaddar et al, 1989;Oppel et al, 1986) and the developing velocity profile. The one-dimensional model taken here accounts for both turbulent intermixing (Zurigat et al, 1989;Ghaddar et al, 1989;Oppel et al, 1986) and the developing velocity profile.…”

Section: The One-dimensional Model Formulationmentioning

confidence: 99%

Study of Charging of Stratified Storage Tanks With Finite Wall Thickness

GHADDAR¹,

AL‐MAARAFIE²

1997

Int. J. Energy Res.

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This paper presents a numerical and experimental study of finite wall thickness on stratification during charging of soar thermal storage tanks. A numerical two‐dimensional spectral‐element model has been used. Predictions of the model are compared with experimental data, and with a one‐dimensional plug flow model. The fluid inlet effect on the stratification is minimized in the experiments by the use of a proper diffuser design with a settling mesh. Both heat conduction in the tank wall and the developing flow in the tank have a significant effect on stratification during charging at low flow rates. The one‐dimensional plug flow model is shown to be inferior to the two‐dimensional model in representing the experimental data. Yet, a simple one‐dimensional flow model corrected for both centreline velocity and mixing effects has given comparable results to the more expensive two‐dimensional model. © 1997 by John Wiley & Sons, Ltd., Int. J. Energy Res., vol 21, 411–427 (1997).

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“…One-dimensional models of stratification behaviour are attractive for their simplicity and their low computational cost compared to two-dimensional models. The one-dimensional model taken here accounts for both turbulent intermixing (Zurigat et al, 1989;Ghaddar et al, 1989;Oppel et al, 1986) and the developing velocity profile. The governing one-dimensional transient energy equation of a Newtonian fluid with constant physical properties is given in dimensionless form by…”

Section: The One-dimensional Model Formulationmentioning

confidence: 99%

“…One-dimensional models have also been formulated by many investigators to describe temperature fields during charging (Zurigat et al, 1989). Such models have been revised and initial mixing in the flow at the inlet has been accounted for by the use of an empirical turbulent mixing effective diffusivity factor (Zurigat et al, 1988;Oppel et al, 1986;Ghaddar et al, 1989). Detailed numerical codes can provide information on local values of velocity and temperature inside the tank, and shed considerable light on tank behaviour during charging.…”

Section: Introductionmentioning

confidence: 99%

Study of Charging of Stratified Storage Tanks With Finite Wall Thickness

Ghaddar

Al-Maarafie

1997

Int. J. Energy Res.

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SUMMARYThis paper presents a numerical and experimental study of finite wall thickness on stratification during charging of soar thermal storage tanks. A numerical two-dimensional spectral-element model has been used. Predictions of the model are compared with experimental data, and with a one-dimensional plug flow model. The fluid inlet effect on the stratification is minimized in the experiments by the use of a proper diffuser design with a settling mesh. Both heat conduction in the tank wall and the developing flow in the tank have a significant effect on stratification during charging at low flow rates.The one-dimensional plug flow model is shown to be inferior to the two-dimensional model in representing the experimental data. Yet, a simple one-dimensional flow model corrected for both centreline velocity and mixing effects has given comparable results to the more expensive two-dimensional model.

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Computer simulation of stratified heat storage

Cited by 33 publications

References 0 publications

Residential CO2 heat pump system for combined space heating and hot water heating

Residential CO2 heat pump system for combined space heating and hot water heating

Study of Charging of Stratified Storage Tanks With Finite Wall Thickness

Study of Charging of Stratified Storage Tanks With Finite Wall Thickness

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