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Title:Termokemično shranjevanje toplote koncentratorja sončne energije : diplomsko delo univerzitetnega študijskega programa I. stopnje
Authors:ID Chowdhury Haque, Marvin (Author)
ID Goričanec, Darko (Mentor) More about this mentor... New window
ID Urbancl, Danijela (Comentor)
Files:.pdf UN_Chowdhury_Haque_Marvin_2026.pdf (6,50 MB)
MD5: EEB9EE365803012FFEF7B105E02F0DC9
 
Language:Slovenian
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:V diplomskem delu je obravnavano numerično modeliranje termokemičnega hranilnika toplote z reakcijskim sistemom Ca(OH)₂/CaO. Namen je razviti dinamični model sistema, povezanega s koncentriranim sončnim virom toplote, ter analizirati njegov odziv med enim dnevnim ciklom polnjenja in praznjenja. Numerični model je izdelan v okolju MATLAB/Simulink. Zasnovan je modularno in vključuje sončni vir toplote, reaktor, parni sistem, toplotni porabnik, bilančni podsistem in analizo učinkovitosti. Med polnjenjem dovedena solarna toplota poganja dehidracijo Ca(OH)₂. Med praznjenjem hidratacija CaO sprošča toploto, ki se odvaja k porabniku. Reaktor je obravnavan kot točkovni sistem. Temperatura, tlak, količina pare in pretvorba so opisani s povprečnimi vrednostmi. Rezultati osnovnega primera pri površini odprtine koncentratorja 4 m2 kažejo največjo pretvorbo 0,999, najvišjo temperaturo 923 K, najvišji tlak v reaktorju 2,56 MPa in najvišji tlak v rezervoarju 2,55 MPa. Dovedena energija znaša 10,47 MJ, shranjena kemijska energija 7,03 MJ, odvedena energija pa 5,48 MJ. Krožni izkoristek znaša 52,31 %. Občutljivostna analiza pokaže, da večja površina odprtine koncentratorja pospeši polnjenje. Ne izboljša pa nujno celotnega dnevnega odziva sistema. Model je primeren za analizo dinamičnega odziva TCES sistema in vpliva obratovalnih parametrov. Za neposredno dimenzioniranje industrijskega reaktorja bi bilo treba model nadgraditi. Dodati bi bilo treba opis prostorskih gradientov, prenosa toplote in snovi ter degradacije materiala.
Keywords:termokemično shranjevanje toplote, kalcijev hidroksid, kalcijev oksid, koncentrirana sončna energija, MATLAB/Simulink, dinamični model
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[M. Chowdhury Haque]
Year of publishing:2026
Number of pages:1 spletni vir (1 datoteka PDF (XIII, 78 str.))
PID:20.500.12556/DKUM-99054 New window
UDC:66.011:544.338(043.2)
COBISS.SI-ID:291586051 New window
Publication date in DKUM:16.09.2026
Views:112
Downloads:4
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:29.07.2026

Secondary language

Language:English
Title:Thermochemical Heat Storage of a Solar Energy Concentrator
Abstract:This thesis addresses the numerical modelling of a thermochemical heat storage system based on the calcium hydroxide/calcium oxide reaction system. The aim is to develop a dynamic model coupled to a concentrated solar heat source and to analyse its response during one daily charging and discharging cycle. The numerical model is developed in MATLAB/Simulink. It has a modular structure and includes the solar heat source, reactor, steam system, heat consumer, balance subsystem and performance evaluation. During charging, the supplied solar heat drives the dehydration of calcium hydroxide. During discharging, the hydration of calcium oxide releases heat, which is delivered to the heat consumer. The reactor is treated as a lumped system. Temperature, pressure, steam amount and conversion are described by average values. The base case at a concentrator aperture area of 4 m² reaches a maximum conversion of 0.999. The maximum temperature is 923 K. The maximum reactor pressure is 2.56 MPa and the maximum reservoir pressure is 2.55 MPa. The supplied energy is 10.47 MJ, the stored chemical energy is 7.03 MJ, and the useful heat output is 5.48 MJ. The round-trip efficiency is 52.31 %. The sensitivity analysis shows that a larger concentrator aperture area accelerates charging. It does not necessarily improve the overall daily response of the system. The model is suitable for analysing the dynamic response of a thermochemical heat storage system and the influence of operating parameters. Direct sizing of an industrial reactor would require an extended model with spatial gradients, heat and mass transfer limitations and material degradation
Keywords:thermochemical heat storage, calcium hydroxide, calcium oxide, concentrated solar energy, MATLAB/Simulink, dynamic model


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