Investigating thermal stratification in a vertical hot water storage tank under multiple transient operations

Kumar, K.V. Suresh; Singh, Shobhana

doi:10.1016/j.egyr.2021.10.088

Cited by 15 publications

(3 citation statements)

References 23 publications

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“…[70, [160][161][162][163][164] Phase Change Material (PCM) Heat Exchanger A latent TES technology consisting of a heat exchanger operating in a transient mode. A specific application of this technology includes the preheating of combustion air at the inlet of a combustion-based process, using an exhaust gas stream as the heat source, as presented in Figure 2b.…”

Section: Thermal Energy Storagementioning

confidence: 99%

Review on Water and Energy Integration in Process Industry: Water-Heat Nexus

2022

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The improvement of water and energy use is an important concern in the scope of improving the overall performance of industrial process plants. The investment in energy efficiency comprehended by the most recent sustainability policies may prove to be an effective response to the fall of energy intensity rates associated with the economic crisis brought by the COVID-19 pandemic. The improvement in water efficiency may also prove to be a potential approach due to its interdependencies to energy use, whose exploitation comprises part of the study of the water-energy nexus. Waste heat recovery and water reclamation practices have been exploited to improve water and energy efficiency. A specific method designated “Combined Water and Energy Integration” has been applied to water recycling as both an additional water source and a heat recovery source in a set of water-using processes. In scientific and industrial domains, there is still a need for integrated approaches of water-using and combustion-based processes for overall water and energy efficiency improvements in industrial plants. In this work, an innovative approach for a simultaneous improvement of water and energy use is proposed based on process integration and system retrofitting principles. This proposal is based on the delineation of two innovative concepts: Water and Energy Integration Systems (WEIS) and Water-Heat Nexus (WHN). A review on existing technologies for waste heat recovery, thermal energy storage and heat-driven wastewater treatment is performed, following a conceptualisation design.

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Section: Thermal Energy Storagementioning

confidence: 99%

Review on Water and Energy Integration in Process Industry: Water-Heat Nexus

2022

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“…The insulated tanks with water are widely used for accumulation of heat and cold. The performance of these technologies depends on liquid stratification [3],(various measures are applied to improved it [4], [5], [6]). Analytical [7], [8], [9] and experimental approaches [10], [11] were used to determine the stratification.…”

Section: Introductionmentioning

confidence: 99%

Analytical determination of the water thermal accumulator capacity in a consumption mode with a constant debit and a fixed temperature

Tomov

2023

IOP Conf. Ser.: Earth Environ. Sci.

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The water thermal accumulators for heat and cold storage are an important part of various engineering installations. This article examines a tank with volume of 1000 [l] in a consumption mode with a constant debit and a fixed temperature. The output volumes of hot water in two regimes – weak stratification and strong stratification are calculated analytically and are compared with the results from an analogical simulation in ANSYS. The ANSYS simulations are unconditionally more accurate, but require specialized knowledge and software. The solutions without simulation procedures are suggested. The output volume of hot water with fixed temperature - as a function of initial and final temperatures in accumulator, flow debit, tank construction and external conditions - can be calculated fast and accurate enough for the engineering practice. Relative differences between analytic and simulations results for all regimes are below 10.5%.

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“…Thermal modeling of sensible heat storage tanks with TRNSYS software has been extensively investigated in the literature [40]. The novelty of this study, compared to the existing literature, is the use of experimental data for verifying the performance of the system, which is also based on a non-standard component for modeling the effect of tank stratification.…”

Section: Introductionmentioning

confidence: 99%

Simplified Modeling and Experimental Validation of a Combi-Storage Distribution Tank for Seasonal Thermal Energy Storage Systems

Roumpedakis,

Leontaritis,

Vlachogiannis

et al. 2023

Thermo

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This study regards the evaluation of the performance of a thermally stratified tank as an intermediate combi-storage tank for a solar-driven residential thermal system coupled to a seasonal energy storage system. In such applications, the efficient operation of this intermediate tank is crucial to the enhanced exploitation of the harvested solar energy and the minimization of heat losses. In this perspective, the development of a dedicated model in TRNSYS software and its validation with experimental results are investigated. With respect to the simulation model’s discretization, it was found that beyond 60 nodes, the benefits to the model’s accuracy are almost negligible. Comparing the experimental data with the simulation’s results, the predicted temperature profile converges accurately to the measured values under steady-state conditions (threshold stabilization period of 1000 s after charging/discharging has occurred). However, the response of the model deviates considerably under transient conditions due to the lack of detailed inertia modeling of both the tank and the rest of the system components. Conclusively, the developed 1D simulation model is adequate for on- and off-design models where transient phenomena are of reduced importance, whereas for dynamic and semi-dynamic simulations, more detailed models are needed.

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Investigating thermal stratification in a vertical hot water storage tank under multiple transient operations

Cited by 15 publications

References 23 publications

Review on Water and Energy Integration in Process Industry: Water-Heat Nexus

Review on Water and Energy Integration in Process Industry: Water-Heat Nexus

Analytical determination of the water thermal accumulator capacity in a consumption mode with a constant debit and a fixed temperature

Simplified Modeling and Experimental Validation of a Combi-Storage Distribution Tank for Seasonal Thermal Energy Storage Systems

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