Non-linear system identification of a latent heat thermal energy storage system

Ghani, Faisal; Waser, R.; O’Donovan, Tadhg S.; Schuetz, Philipp; Zaglio, Maurizio; Wortischek, J.

doi:10.1016/j.applthermaleng.2018.02.035

Cited by 29 publications

(13 citation statements)

References 23 publications

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“…The store design could be optimized for use with a solar thermal system with heat collected by solar panels, used to directly charge a PCM filled latent heat storage system, which would be discharged at a later time to meet heat loads. Another potential application is in conjunction with an air source heat pump, allowing the heat pump to be operated using low-cost off-peak electricity, charging the store which can subsequently be discharged at times of peak heat demand [23,24].…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance Analysis of the Charging/Discharging Process of a Shell and Horizontally Oriented Multi-Tube Latent Heat Storage System

Fadl

Eames

2020

Energies

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In this study, the thermal performance of latent heat thermal energy storage system (LHTESS) prototype to be used in a range of thermal systems (e.g., solar water heating systems, space heating/domestic hot water applications) is designed, fabricated, and experimentally investigated. The thermal store comprised a novel horizontally oriented multitube heat exchanger in a rectangular tank (forming the shell) filled with 37.8 kg of phase change material (PCM) RT62HC with water as the working fluid. The assessment of thermal performance during charging (melting) and discharging (solidification) was conducted under controlled several operational conditions comprising the heat transfer fluid (HTF) volume flow rates and inlet temperatures. The experimental investigations reported are focused on evaluating the transient PCM average temperature distribution at different heights within the storage unit, charging/discharging time, instantaneous transient charging/discharging power, and the total cumulative thermal energy stored/released. From the experimental results, it is noticed that both melting/solidification time significantly decreased with increase HTF volume flow rate and that changing the HTF inlet temperature shows large impacts on charging time compared to changing the HTF volume flow rate. During the discharging process, the maximum power output was initially 4.48 kW for HTF volume flow rate of 1.7 L/min, decreasing to 1.0 kW after 52.3 min with 2.67 kWh of heat delivered. Based on application heat demand characteristics, required power levels and heat demand can be fulfilled by employing several stores in parallel or series.

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Section: Introductionmentioning

confidence: 99%

Thermal Performance Analysis of the Charging/Discharging Process of a Shell and Horizontally Oriented Multi-Tube Latent Heat Storage System

Fadl

Eames

2020

Energies

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“…For enthalpy formulation method, the enthalpy is considered as a dependent variable, and the flow of latent heat is expressed in terms of the volumetric enthalpy H as a function of the PCM temperature t , which is the only unknown variable:

\frac{\partial H}{∂τ} = \nabla ((), normalλ ((), \nabla t))

…”

Section: Heat Transfer Analysismentioning

confidence: 99%

“…Enthalpy function h , defined as a function of temperature, is given by Voller . For a phase change process, the energy conservation can be expressed mathematically in terms of the total volumetric enthalpy and temperature for constant thermo‐physical properties, as follows:

\frac{\partial H}{∂τ} = \nabla ((), λ_{k} ((), \nabla t));

where H is the total volumetric enthalpy, in J/m 3 ; τ is the time, in s; λ k is the thermal conductivity of phase k in PCM, in W/(m⋅K); and t is the temperature, in K.…”

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Review on heat transfer analysis in thermal energy storage using latent heat storage systems and phase change materials

2018

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Summary Thermal energy storage (TES) is a technology that stocks thermal energy by heating or cooling a storage medium so that the stored energy can be used later for heating and cooling applications and for power generation. TES has recently attracted increasing interest to thermal applications such as space and water heating, waste heat utilisation, cooling, and air conditioning. Phase change materials (PCMs) used for the storage of thermal energy as latent heat are special types of advanced materials that substantially contribute to the efficient use and conservation of waste heat and solar energy. This paper provides a comprehensive review on the development of latent heat storage (LHS) systems focused on heat transfer and enhancement techniques employed in PCMs to effectively charge and discharge latent heat energy, and the formulation of the phase change problem. The main categories of PCMs are classified and briefly described, and heat transfer enhancement technologies, namely dispersion of low‐density materials, use of porous materials, metal matrices and encapsulation, incorporation of extended surfaces and fins, utilisation of heat pipes, cascaded storage, and direct heat transfer techniques, are also discussed in detail. Additionally, a two‐dimensional heat transfer simulation model of an LHS system is developed using the control volume technique to solve the phase change problem. Furthermore, a three‐dimensional numerical simulation model of an LHS is built to investigate the quasi‐steady state and transient heat transfer in PCMs. Finally, several future research directions are provided.

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“…Numerous research investigations have been conducted over the past four decades to understand the physics of latent thermal energy storage (TES) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Many are either strictly analytical and numerical or analytical and experimental [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Development and Validation of a Latent Thermal Energy Storage Model Using Modelica

et al. 2021

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An abundance of research has been performed to understand the physics of latent thermal energy storage with phase change material. Some analytical and numerical findings have been validated by experiments, but there are few free and open-source models available to the general public for use in systems simulation and analysis. The Modelica programming language is a good avenue to make such models available, because it is object-oriented, equation-based, declarative, and acausal. These characteristics have enabling the creation of component model libraries that can be used to build larger system simulations for design analysis. The authors have previously developed a numerical framework to model phase change thermal storage and have validated model predictions with experiments. The objectives of this paper are to describe the transfer of the numerical framework to an implementation in a Modelica component model and to validate the Modelica model with data from the experiment and the original numerical framework.

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Non-linear system identification of a latent heat thermal energy storage system

Cited by 29 publications

References 23 publications

Thermal Performance Analysis of the Charging/Discharging Process of a Shell and Horizontally Oriented Multi-Tube Latent Heat Storage System

Thermal Performance Analysis of the Charging/Discharging Process of a Shell and Horizontally Oriented Multi-Tube Latent Heat Storage System

Review on heat transfer analysis in thermal energy storage using latent heat storage systems and phase change materials

Development and Validation of a Latent Thermal Energy Storage Model Using Modelica

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