Theoretical Predictions for Latent Heats and Phase-Change Temperatures of Polycrystalline PCMs

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F17%3A00312616" target="_blank" >RIV/68407700:21110/17:00312616 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1063/1.4994506" target="_blank" >http://dx.doi.org/10.1063/1.4994506</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1063/1.4994506" target="_blank" >10.1063/1.4994506</a>

Result language
angličtina
Original language name
Theoretical Predictions for Latent Heats and Phase-Change Temperatures of Polycrystalline PCMs
Original language description
We had previously developed a microscopic approach from which it is possible to fit enthalpy jumps and heat capacity peaks of polycrystalline phase-change materials that consists of a large number of grains. It is also possible to determine the corresponding latent heat and phase-change temperature. These results are given in a form of sums over grain diameters that can be evaluated numerically. Therefore, their behavior and dependence on physical parameters are not susceptible to straightforward interpretations. Here we use the results to derive simple formulas for the maximum position (Tmax), height (H), and an asymmetry factor (α) of those heat capacity peaks that are very asymmetric. In addition, we express the phase-change temperature as a simple combination of Tmax, H, α, and the peak’s area. We apply our formulas to Rhubitherm 27 as an example PCM for which the heat capacity peak is so asymmetric that it has about 80 % of its total area below its maximum position.
Czech name
—
Czech description
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Project
<a href="/en/project/GBP105%2F12%2FG059" target="_blank" >GBP105/12/G059: Cumulative time dependent processes in building materials and structures</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
THERMOPHYSICS 2017: 22nd International Meeting of Thermophysics 2017 and 4th Meeting of EnRe 2017
ISBN
978-0-7354-1546-1
ISSN
—
e-ISSN
1551-7616
Number of pages
5
Pages from-to
—
Publisher name
American Institute of Physic AIP
Place of publication
Santa Fe
Event location
Těrchová
Event date
Sep 12, 2017
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000426600400031

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