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

García-Marí, Eugenio; Gasque, Marı́a; Gutiérrez-Colomer, Rosa Penélope; Ibáñez, Federico; González-Altozano, Pablo

doi:10.1016/j.applthermaleng.2013.08.023

Cited by 57 publications

(44 citation statements)

References 16 publications

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“…Signals were captured, displayed and recorded by software compiled in Labview (NI) every 10 s. The TC temperatures with all the acquisition system were calibrated against a PT100 (error < ±0.1%). Figure 2 provides a picture of the experimental facility, described in more detail in [19].…”

Section: Facility and Experimental Trialsmentioning

confidence: 99%

“…The effect of the performance of the two inlet devices (SBCD and elbow), water flow rate and the turbulence created, was studied in detail in [19]. At the end of the charge period, the temperatures registered by the thermocouples located at the top and in the middle part of the tank were verified to be lower with the elbow than with the SBCD, indicating a greater degree of mixing during thermal charging.…”

Section: Facility and Experimental Trialsmentioning

confidence: 99%

“…The differences in thermocline thickness evolution between the distinct trials, as determined by Virtual TC, were not detected or were less evident when other procedures to study the degree of stratification were employed, such as the fit with the four-parameter sigmoid function proposed by [18], or 1-MIX number as shown in [19].…”

Section: Applying Virtual Tc To Estimate Thermocline Thicknessmentioning

confidence: 99%

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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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Section: Facility and Experimental Trialsmentioning

confidence: 99%

Section: Facility and Experimental Trialsmentioning

confidence: 99%

Section: Applying Virtual Tc To Estimate Thermocline Thicknessmentioning

confidence: 99%

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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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“…Thermal stratification is usually a desirable effect in hot water storage tanks, as it could lead to higher operating temperatures [17,18], lower auxiliary energy consumption [19,20] and higher exergy outputs [21] than fully mixed storage, that is, energy storage at homogeneous temperature. It has been proved that the mass velocity of the input/output flows has a negative effect on stratification due to the mixing effect of the flow kinetic energy [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Effect of the collector tilt angle on thermal efficiency and stratification of passive water in glass evacuated tube solar water heater

et al. 2015

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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%

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

Cited by 57 publications

References 16 publications

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

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

Effect of the collector tilt angle on thermal efficiency and stratification of passive water in glass evacuated tube solar water heater

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

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