Numerical analysis of geometrical and process parameters influence on temperature stratification in a large volumetric heat storage tank

Kocijel, Lino; Mrzljak, Vedran; Glažar, Vladimir

doi:10.1016/j.energy.2019.116878

Cited by 30 publications

(11 citation statements)

References 39 publications

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“…The influence of mesh quality and time step was determined in a previous paper. 15 In Figure 9, the validation of the discharge process in TPP-HP Zagreb is shown. From the diagram, it can be seen that the initial polynomial does not coincide in the part of the tank above 10 m completely with the initial temperature curve recorded at 4:46 PM.…”

Section: Validation Of Mathematical Modelmentioning

confidence: 99%

“…4 The construction of water steam pipelines as a form of first-generation district heating all the way to the transition to the hot water and integration with renewable energy sources and waste heat from industry brings district heating and cooling systems in the fourth generation and integration in smart energy systems. [5][6][7][8][9] My research to date on the influence of geometric and process parameters on thermal and hydraulic phenomena within large volumetric heat storage tank (V = 25 000 m 3 ) used in municipal district heating systems of large cities [10][11][12][13][14] has led to the following conclusion 15 :…”

Section: Introductionmentioning

confidence: 99%

“…My research to date on the influence of geometric and process parameters on thermal and hydraulic phenomena within large volumetric heat storage tank ( V = 25 000 m 3 ) used in municipal district heating systems of large cities 10‐14 has led to the following conclusion 15 : By reducing the diameter and increasing the height of the tank, a higher degree of temperature stratification is obtained. The analyzed tank with the ratio H / D = 2 generates the highest water temperature in the tank and the smallest width of the thermocline. An increase in the volume flow rate of water leads to an increase in the degree of temperature stratification in the storage tank due to the shortening of the tank charging time.…”

Section: Introductionmentioning

confidence: 99%

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Geometry change impact on thermal efficiency with large volumetric sensible heat storage tank

Kocijel

2022

Energy Storage

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By installation in district heating and cooling systems, large volumetric sensible heat storage tank is a technology that can reduce CO 2 emissions into the atmosphere, ensure the integration of renewable energy sources into district heating and cooling systems, overcome the mismatch between production and demand and increase reliability and efficiency of entire systems. Such tanks operate on the principle of temperature stratification. In this paper, the processes of charging and discharging the heat storage tank used in district heating systems depending on the geometric and process parameters are analyzed and the thermal efficiency of each of these processes is calculated. The thermal efficiency of the tank charging process is calculated based on the distribution of the warmer water temperature in the tank after the complete tank charging process and varies between 53.85% and 96.75%. The thermal efficiency of the tank discharging process was calculated based on the warmer water outlet temperature and varies between 87.83% and 96.00%. Validation of mathematical model was achieved by comparing the data obtained by measuring the water temperature in the heat storage tank installed in the city thermal power plant-heat plant and the results of numerical calculation.

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Section: Validation Of Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geometry change impact on thermal efficiency with large volumetric sensible heat storage tank

Kocijel

2022

Energy Storage

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“…The change of water density as a function of temperature, for normal conditions, has been approximated by the function: 𝜌𝜌(𝑇𝑇) = −0.002767𝑇𝑇 � -0.17963𝑇𝑇 + 1,003.914 (5) where: 𝜌𝜌(𝑇𝑇) -temperature dependent water density function, 𝑇𝑇 -fluid temperature.…”

Section: Physical Conditionsmentioning

confidence: 99%

“…Nowadays, there has been a growing interest in large hot water storage tanks to improve heat supply to consumers. The article [5] presents numerical analyses of two-dimensional temperature and velocity fields in vertical cylindrical large-volume heat accumulators used in district heating.…”

Section: Introductionmentioning

confidence: 99%

Transient numerical analysis of charging a heat accumulator in a combined heat and power plant

et al. 2021

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This paper presents a technical description and characteristics of heat accumulation system operation in one of the Polish combined heat and power (CHP) plants. The total thermal capacity of the nonpressure hot water accumulator is 75 MWh. An important issue in the case of hot water tanks is thermal stratification caused by the difference in density between higher-temperature water, located in the top of the hot water storage tank and colder water in its bottom. The article presents the results of numerical analysis based on axial-symmetric model of hot water tank using Ansys Fluent software. Simulations with the Computational Fluid Dynamics (CFD) method were carried out for the process of charging the heat accumulator lasting 10 hours. The results were compared with the measurement data from the CHP plant.

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Experimental and numerical study on thermal performance and inlet and outlet structure optimization of phase change heat storage tank

Zhang

et al. 2022

Intl J of Energy Research

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Summary For the sake of enhancing the heat storage tank performance, the thermal characteristics and structural improvement of a water tank equipped with phase change material (PCM) were explored in this paper. The influence of PCM on the performance of the tank under conditions was experimentally analyzed, and the optimal working condition is determined by comparing the difference in effective heat storage rate under different inlet flow rates and the temperature of the water. The concept of “heat transfer blind zone” is introduced and analyzed, and the temperature and velocity field in PCM tanks with different structures are numerically compared. The results show that the addition of PCM makes the discharging time and effective water supply increase by 12.0% and the charging time increase by 6.0%. As the inlet flow rate and temperature of water rise, the thermal storage capacity reduces, and the effective heat storage rate rises first and then drops. The PCM tank has the optimum performance at the inlet water temperature of 70°C and the inlet flow rate of 15 L/h. The inlet and outlet setting up and down has the best effect on eliminating the “heat transfer blind zone” in the water tank. The research results have a good reference value for the design and realistic operation of the phase change heat storage tank.

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Numerical analysis of geometrical and process parameters influence on temperature stratification in a large volumetric heat storage tank

Cited by 30 publications

References 39 publications

Geometry change impact on thermal efficiency with large volumetric sensible heat storage tank

Geometry change impact on thermal efficiency with large volumetric sensible heat storage tank

Transient numerical analysis of charging a heat accumulator in a combined heat and power plant

Experimental and numerical study on thermal performance and inlet and outlet structure optimization of phase change heat storage tank

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