ROBUSTNESS ANALYSIS OF VARIOUS APPROACHES TO MODELING OF THE PHASE CHANGE FRONT PROPAGATION

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F17%3APU126324" target="_blank" >RIV/00216305:26210/17:PU126324 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1115/IMECE2017-71372" target="_blank" >http://dx.doi.org/10.1115/IMECE2017-71372</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1115/IMECE2017-71372" target="_blank" >10.1115/IMECE2017-71372</a>

Jazyk výsledku

angličtina

Název v původním jazyce

ROBUSTNESS ANALYSIS OF VARIOUS APPROACHES TO MODELING OF THE PHASE CHANGE FRONT PROPAGATION

Popis výsledku v původním jazyce

Latent heat thermal energy storage (LHTES) has recently evolved into a promising approach for energy savings and pollution reduction. Phase change materials (PCMs) and the latent heat accompanying the phase change can be utilized to accumulate, store, are release the thermal energy when needed. The latent heat of the phase change allows for a storage of a relatively large amount of heat in a narrow temperature interval. The solid-liquid phase transition is widely utilized in such LHTES applications. Computer simulation tools are usually applied in the optimal design and real-time control of LHTES devices as the simulations are fast, relatively easy to perform and not expensive. Different numerical methods exist for modeling of heat transfer problems with phase changes. The methods can be assessed in several ways - accuracy, mathematical and programming complexity, demands for computational time and hardware, robustness etc. The wellknown enthalpy method, the effective heat capacity method and the temperature recovery method are widely utilized as they are simple and easy to implement. These so-called domain or front capturing methods suffer from a low accuracy in the vicinity of the phase interface and they are quite sensitive to the size of the time step. On the other hand, front tracking methods allow for very precise results near the phase interface, but they are more complex and computationally quite demanding. An important point is also the sensitivity and robustness of a method in relation to the thermal conditions and properties. In particular, the large heat flux at the boundary and the high thermal conductivity often cause numerical difficulties and instabilities. In practice, computer models have to be precise enough and sufficiently fast, especially in real-time applications. However, these two objectives are related in an opposite direction. The paper presents a robustness and sensitivity analysis of the above mentioned methods. The responses and numeric

Název v anglickém jazyce

ROBUSTNESS ANALYSIS OF VARIOUS APPROACHES TO MODELING OF THE PHASE CHANGE FRONT PROPAGATION

Popis výsledku anglicky

Latent heat thermal energy storage (LHTES) has recently evolved into a promising approach for energy savings and pollution reduction. Phase change materials (PCMs) and the latent heat accompanying the phase change can be utilized to accumulate, store, are release the thermal energy when needed. The latent heat of the phase change allows for a storage of a relatively large amount of heat in a narrow temperature interval. The solid-liquid phase transition is widely utilized in such LHTES applications. Computer simulation tools are usually applied in the optimal design and real-time control of LHTES devices as the simulations are fast, relatively easy to perform and not expensive. Different numerical methods exist for modeling of heat transfer problems with phase changes. The methods can be assessed in several ways - accuracy, mathematical and programming complexity, demands for computational time and hardware, robustness etc. The wellknown enthalpy method, the effective heat capacity method and the temperature recovery method are widely utilized as they are simple and easy to implement. These so-called domain or front capturing methods suffer from a low accuracy in the vicinity of the phase interface and they are quite sensitive to the size of the time step. On the other hand, front tracking methods allow for very precise results near the phase interface, but they are more complex and computationally quite demanding. An important point is also the sensitivity and robustness of a method in relation to the thermal conditions and properties. In particular, the large heat flux at the boundary and the high thermal conductivity often cause numerical difficulties and instabilities. In practice, computer models have to be precise enough and sufficiently fast, especially in real-time applications. However, these two objectives are related in an opposite direction. The paper presents a robustness and sensitivity analysis of the above mentioned methods. The responses and numeric

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20303 - Thermodynamics

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the International Mechanical Engineering Congress & Exposition

ISBN

978-0-7918-5843-1

ISSN

—

e-ISSN

—

Počet stran výsledku

9

Strana od-do

1-9

Název nakladatele

The American Society of Mechanical Engineers

Místo vydání

Tampa, Florida, USA

Místo konání akce

Tampa, Florida, USA

Datum konání akce

5. 11. 2017

Typ akce podle státní příslušnosti

CST - Celostátní akce

Kód UT WoS článku

000428485700010