Effect of wall conductivity on thermal stratification

Murthy, Sunil; Nelson, J. E. B.; Rao, T.L. Sitharama

doi:10.1016/0038-092x(92)90006-v

Cited by 24 publications

(15 citation statements)

References 4 publications

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“…In general, the draw-off profiles shown in Figs. 4 and 5 display the classical profile that is characteristic for hot water discharge from naturally stratified thermal storage tanks [11,20,[26][27][28][29][30][31][32]. These profiles confirm first the effectiveness of the proposed inlet designs in restraining mixing between the incoming cold water and the storage hot water during thermocline formation and second their ability to promote good thermal stratification inside such small size storage tanks.…”

Section: Resultssupporting

confidence: 57%

“…This means that for a particular inlet design EWH B exhibits better stratification and thus it is capable of discharging greater volumes of hot water at almost constant temperature than EWH A in the first mean residence time s 6 1. Since EWHs A and B have the same 50 L volume, it can be concluded that the tank aspect ratio has a great effect on the performance of such small size EWHs as with large storage vessels [12][13][14][15][16][17][29][30][31][32].…”

Section: Resultsmentioning

confidence: 99%

“…The third performance metric is due to Abdoly and Rapp [31] and is called the fraction of heat recoverable F. It is defined as the fraction of the net thermal energy delivered by the time the outlet-inlet temperature difference has dropped 20% from its initial value [31,32]:…”

Section: Fraction Of Heat Recoverablementioning

confidence: 99%

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Effect of inlet design on the performance of storage-type domestic electrical water heaters

Hegazy

2007

Applied Energy

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Section: Resultssupporting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

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Effect of inlet design on the performance of storage-type domestic electrical water heaters

Hegazy

2007

Applied Energy

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“…In order to diminish the axial heat conduction effect and to preserve or improve stratification, several studies have proposed insulating the inner wall surface by placing insulation material or any low thermal conductivity material compatible with stored fluid [6][7][8][9].…”

Section: Introduction and Objectivesmentioning

confidence: 99%

Study of the influence of inner lining material on thermal stratification in a hot water storage tank

Gasque

González-Altozano

Maurer

et al. 2015

Applied Thermal Engineering

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ElsevierGasque Albalate, M.; González Altozano, P.; Maurer, D.; Moncho Esteve, IJ.; Gutiérrez-Colomer, RP.; Palau-Salvador, G.; García-Mari, E. (2015). Study of the influence of inner lining material on thermal stratification in a hot water storage tank. Applied Thermal Engineering. 75:344-356. doi:10.1016Engineering. 75:344-356. doi:10. /j.applthermaleng.2014 ABSTRACTThe present study has analyzed the influence of thermal conductivity of the inner lining material on the stratification process in a hot water tank during thermal charge and the later standby period. This analysis has been carried out numerically by a three-dimensional Computational Fluid Dynamics (CFD) model. Experimental measurements of temperature profiles are used to select and verificate the model, and to later validate CFD simulations. With the validated model, temperature over time at several heights, temperature profiles, velocity contours, water streamtraces and temperature contours, are studied and compared for three different inner lining materials. The obtained results confirm that a weak conducting lining material favours energy storage in the tank and the thermal stratification of water during charge and subsequent standby period. The effect of the inner lining material on the energy accumulated in water and on the moment of energy (stratification) is potentially enhanced when the material's thermal conductivity diminishes. The use of insulating paints as inner lining for water storage tanks could be a possible solution to be studied and subsequently adopted in practice to improve the efficient use of energy in stored water. The analysis 2 techniques employed prove most useful and enable the results to be compared and presented in a novel way.

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“…The literature on the subject presents many experimental [1][2][3][4][5] and numerical simulation [6][7][8][9][10][11] works on thermal storage, most of them using water as working fluid. Recently Oliveski [5] and Oliveski et al [10,11] analyzed thermal storage water tanks from both numerical and experimental approaches.…”

Section: Introductionmentioning

confidence: 99%

Natural convection in a tank of oil: experimental validation of a numerical code with prescribed boundary condition

Oliveski

Macagnan

Copetti

et al. 2005

Experimental Thermal and Fluid Science

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Effect of wall conductivity on thermal stratification

Cited by 24 publications

References 4 publications

Effect of inlet design on the performance of storage-type domestic electrical water heaters

Effect of inlet design on the performance of storage-type domestic electrical water heaters

Study of the influence of inner lining material on thermal stratification in a hot water storage tank

Natural convection in a tank of oil: experimental validation of a numerical code with prescribed boundary condition

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