Modeling of heat capacity peaks and enthalpy jumps of phase-change materials used for thermal energy storage

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F17%3A00304308" target="_blank" >RIV/68407700:21110/17:00304308 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.ijheatmasstransfer.2016.11.024" target="_blank" >http://dx.doi.org/10.1016/j.ijheatmasstransfer.2016.11.024</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijheatmasstransfer.2016.11.024" target="_blank" >10.1016/j.ijheatmasstransfer.2016.11.024</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Modeling of heat capacity peaks and enthalpy jumps of phase-change materials used for thermal energy storage

Popis výsledku v původním jazyce

We consider three phase-change materials (PCMs) in which a change between two phases may be used to store/release thermal energy. Their enthalpy and heat capacity were measured in a quasistatic regime by adiabatic scanning calorimetry and show, within a certain temperature range, a single distinct jump and peak, respectively. We present a microscopic development from which the jumps and peaks can be accurately fitted and that could be analogously applied even to other PCMs. In addition, we determine the baseline and excess part of the heat capacity and thus the latent heat associated with the phase change. The development is based on the observation that PCMs often have polycrystalline structure, being composed of many single-crystalline grains. The enthalpy and heat capacity measured in experiments are therefore interpreted as superpositions of many contributions that come from the individual grains.

Název v anglickém jazyce

Modeling of heat capacity peaks and enthalpy jumps of phase-change materials used for thermal energy storage

Popis výsledku anglicky

We consider three phase-change materials (PCMs) in which a change between two phases may be used to store/release thermal energy. Their enthalpy and heat capacity were measured in a quasistatic regime by adiabatic scanning calorimetry and show, within a certain temperature range, a single distinct jump and peak, respectively. We present a microscopic development from which the jumps and peaks can be accurately fitted and that could be analogously applied even to other PCMs. In addition, we determine the baseline and excess part of the heat capacity and thus the latent heat associated with the phase change. The development is based on the observation that PCMs often have polycrystalline structure, being composed of many single-crystalline grains. The enthalpy and heat capacity measured in experiments are therefore interpreted as superpositions of many contributions that come from the individual grains.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20303 - Thermodynamics

Projekt

<a href="/cs/project/GBP105%2F12%2FG059" target="_blank" >GBP105/12/G059: Kumulativní časově závislé procesy ve stavebních materiálech a konstrukcích</a><br>

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 periodika

International Journal of Heat and Mass Transfer

ISSN

0017-9310

e-ISSN

1879-2189

Svazek periodika

107

Číslo periodika v rámci svazku

April

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

123-132

Kód UT WoS článku

000393727300013

EID výsledku v databázi Scopus

2-s2.0-84995704432