Analysis and optimization of temperature stratification in a thermal energy storage tank

Penkova, Nina; Harryzanov, N.

doi:10.2495/esus140401

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…Different scenarios of charging and discharging of the tank can be simulated accepting them as open or closed (walls). The pipe walls do not influence significantly on the processes and can be modeled as boundary interfaces [6]. The walls of the tank are also excluded from the geometrical model.…”

Section: Conceptions For Modeling Of the Transient Fluid Flow And Hea...mentioning

confidence: 99%

Modelling and numerical simulation of the transport phenomena in water thermal energy storage tanks

2021

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Mathematical model for numerical simulation of the transient heat transfer and fluid flows in water thermal energy storage tanks is developed. The model allows analysis of the thermal fields in the accumulators at different schemes and modes of charging and discharging. It was verified and validated based on experimentally obtained information about the temperature stratification at charging of a thermal accumulator at a laboratory solar system. The proposed approach for numerical study of the thermal energy storage is convenient for parametrical estimation and improvement of the efficiency of the thermal systems.

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Section: Conceptions For Modeling Of the Transient Fluid Flow And Hea...mentioning

confidence: 99%

Modelling and numerical simulation of the transport phenomena in water thermal energy storage tanks

2021

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“…Preserving temperature stratification in liquid fluids is crucial for the efficiency and proper operation of thermal collectors. Stratification mechanisms are influenced by operational flow rates, heat loss to the environment, mixing instigated by inlet and outlet fluids, tank designs, and discharging and charging passages [18]. Tesfay and Venkatesan [19] investigated various liquid medium thermal energy storage systems, and a mixed-media single-tank thermocline thermal energy storage was selected and built based on the Schumann equation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Thermal Storage Tank with Middle Baffles Distributions

Karam,

Ibrahim,

Alesbe

et al. 2023

MMEP

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A numerical investigation into the influence of baffle placement on thermal stratification within a vertical cylindrical cold-water tank is conducted. The tank, sporting a diameter of 400 mm and a height of 1000 mm, incorporates inlet and outlet ports of equal diameter (17.39 mm). The baffles, integral to this study, are of 200 mm in length and 2 mm in thickness. The study leverages computational methodologies to decipher the equations that govern heat transfer and fluid flow within a baffle-integrated tank. The tank commences with an initial water temperature of 4.4℃, and an inflow of water at 13.3℃, from the upper left side. Validation of the adopted tests is sought through experimental data available in extant literature. The abstract delves into the impact of baffle number and positioning on a multitude of elements-thermocline temperature, streamline creation, vortex formation, velocity vectors, Stratification Number, and Richardson Number-across varied cases during the discharging phase. The introduction of one or two baffles exerts a marginal effect on temperature distribution contours. However, a third baffle accentuates this impact, expanding the hot-cold interface with a pronounced penetration effect within the tank. Interestingly, the influence of three baffles on temperature distribution contours diminishes at a discharging time of 2173.4 s. This study provides insight into the nuanced role of baffles within thermal storage tanks, elucidating key considerations for their optimal placement and number.

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“…This makes them both effective for well-known environmental issues related to direct and indirect emissions of carbon dioxide in the atmosphere, and efficient for heating and cooling. Moreover, they satisfy both consumers' expectations of both quality and cost effectiveness [3][4]. The ever-increasing energy consumption of buildings has caused a great interest in improving the seasonal characteristics of heat pumps [5][6].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of heat pump type air-water for heating system performance

Zlateva

Yordanov

2019

E3S Web Conf.

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The operation of an air-to-water heat pump system providing space heating production for an administrative building in Varna has been explored. For this purpose, discontinuous operational mode of the heat pump system during wintertime is considered. Study has been performed by use of real values for external ambient temperature and operating characteristics of the heat pump system. The seasonal efficiency of the heat pump operation has been calculated. Also, the minimal external ambient temperature until the heat pump may work in heating regime and operation duration at outdoor air temperatures higher than the design air temperature can be determined. The economic analysis of the heat pump system exploitation has been made finally.

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Analysis and optimization of temperature stratification in a thermal energy storage tank

Cited by 5 publications

References 4 publications

Modelling and numerical simulation of the transport phenomena in water thermal energy storage tanks

Modelling and numerical simulation of the transport phenomena in water thermal energy storage tanks

Numerical Simulation of Thermal Storage Tank with Middle Baffles Distributions

Experimental study of heat pump type air-water for heating system performance

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