The effect of diffuser configuration on thermal stratification in a rectangular storage tank

Chung, Jae Dong; Cho, Sung Hwan; Tae, Choon Seob; Yoo, Hana

doi:10.1016/j.renene.2007.12.013

Cited by 78 publications

(41 citation statements)

References 16 publications

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“…Mixing takes place when the water inlet temperature is different from that of the stored water with which it comes into contact. Therefore, designing water inlet devices to distribute the flow uniformly improves the performance of thermal storage tanks by restraining the mixing induced by water inflow [4][5][6][7][8].…”

Section: A N U S C R I P Tmentioning

confidence: 99%

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A new inlet device that enhances thermal stratification during charging in a hot water storage tank

García-Marí¹,

Gasque²,

Gutiérrez-Colomer³

et al. 2013

Applied Thermal Engineering

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Section: A N U S C R I P Tmentioning

confidence: 99%

“…Parameters related to the thermocline, such as its thickness or the dimensionless height of its midpoint, may also be used to assess the degree of stratification in a tank, and to this end, the thickness of the thermocline region has been employed in many studies [6,8,10,11].…”

Section: A N U S C R I P Tmentioning

confidence: 99%

A new inlet device that enhances thermal stratification during charging in a hot water storage tank

García-Marí¹,

Gasque²,

Gutiérrez-Colomer³

et al. 2013

Applied Thermal Engineering

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“…In many cases, the application of certain indices or numbers used to evaluate the stratification necessarily requires the characterisation of the temperature distribution profile inside the tank and its evolution over time (see the classification and summaries of such numbers in [1,10,13]). There are also some methods for evaluating and comparing stratification efficiencies based on the thermocline gradient or the thickness of the thermocline region [10] which have been used in many studies to assess the degree of stratification in a tank [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

New methodology for the characterisation of thermal performance in a hot water storage tank during charging

González-Altozano

Gasque

Ibáñez

et al. 2015

Applied Thermal Engineering

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ElsevierGonzález Altozano, P.; Gasque Albalate, M.; Ibáñez Solís, F.; Gutiérrez-Colomer, RP. (2015). New methodology for the characterisation of thermal performance in a hot water storage tank during charging. Applied Thermal ABSTRACTIn solar water heating systems, the application of certain stratification indices requires the characterisation of the water temperature distribution profile inside the tank and its evolution. In order to avoid the limitations and drawbacks related to the discrete measures provided by experimental trials, this paper presents a newly developed method, called Virtual TC, which allows the water temperature to be estimated at any depth and at any time in a storage tank during the charge process. The proposed methodology can be very useful for estimating the numerous temperature-dependent indices employed for the characterisation and evaluation of thermal stratification in water storage tanks. As a practical example, it was successfully applied to determine the instantaneous temperature profile and thermocline thickness and its evolution throughout charging. It is concluded that the Virtual TC method gives highly satisfactory results under normal operational conditions for a hot water storage tank during the charge cycle.

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“…The water inlet and outlets were located at the top and bottom of the tank,. They were equipped with diffusers consisting of two parallel plates since it has been shown that these devices improve the performance of thermal storage tanks by restraining mixing induced by water inflow [12,[16][17][18]. Dimensions and constructive features of this prototype were conditioned because the tank was built with a dual purpose: on the one hand the mathematical modeling with CFD presented in this work, validated against experimental trials; and on the other hand, the determination and characterization of the flow velocity field applying the Particle Tracking Velocimetry (PTV) technique.…”

Section: Experimental Setup and Instrumentationmentioning

confidence: 99%

“…Indeed, many references can be found in recent research works which used CFD to investigate thermal stratification within water storage tank [1]. The great majority of these studies have been focussed on the effect of tank design parameters such as the diffuser configuration [12] or aspect ratios and operating conditions [10,11,[13][14][15].…”

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 effect of diffuser configuration on thermal stratification in a rectangular storage tank

Cited by 78 publications

References 16 publications

A new inlet device that enhances thermal stratification during charging in a hot water storage tank

A new inlet device that enhances thermal stratification during charging in a hot water storage tank

New methodology for the characterisation of thermal performance in a hot water storage tank during charging

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

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