20.500.12556/DKUM-45334 AKUMULATORJI TOPLOTE S FAZNO SPREMINJAJOČO SNOVJO PHASE - CHANGE MATERIALS HEAT ACCUMULATORS Ena izmed tehnik shranjevanja energije je uporaba akumulatorjev toplote s fazno spreminjajočo snovjo (ang. phase change materials – PCMs). V osnovi so to kemijske ali homogene zmesi, ki so organske, anorganske ali evtektične sestave in imajo visoko talilno toploto, pri čemer s taljenjem in strjevanjem sprejemajo in oddajajo določeno količino toplote, ki je za vsako snov s spremembo faze drugačna. Snov v procesu taljenja absorbira toploto, ki jo v procesu strjevanja lahko oddaja. V diplomski nalogi so obravnavane tri vrste tekoče-trdno fazno spreminjajočih snovi: anorganske, organske in evtektične. Natančneje so predstavljene anorganske fazno spreminjajoče snovi, h katerim spadajo hidratizirane soli, kovine in anorganski evtektiki. Predstavljene so tri, za shranjevanje toplotne energije najbolj primerne, hidratizirane soli in anorganske evtektike. Nadalje je obravnavavan postopek enkapsulacije, s katero se izboljšajo termofizikalne lastnosti fazno spreminjajočih snovi. Predstavljena je tudi uporaba fazno spreminjajočih snovi za solarno ogrevanje vode in transport temperaturno občutljivih snovi, ter uporaba v zgradbah in biomedicini. V zaključku je s pomočjo programskega paketa MathCad izveden preračun sprejete in oddane toplote fazno spreminjajoče snovi v cevnem toplotnem prenosniku pri vtoku in iztoku vroče in hladne vode, kar imenujemo proces polnjenja in praznjenja fazno spreminjajoče snovi s toploto. One of the techniques for storing heat energy is the use of thermal energy storage systems with phase changing materials (PCMs). Basically, these are the chemical substances or homogeneous mixtures of organic, inorganic, or a eutectic structure.They are having a high heat of fusion, receiving and transmitting a certain amount of heat, wherein in the process of melting and solidification, which is different for each material with the phase change. During the process of melting, phase changing material absorbes heat, which is released later in the proces of solidifying. In this diploma paper three types of liquid-solid phase changing materials are presented: inorganic, organic and eutectic. More specifically presented are inorganic phase changing materials, to which belong hydrated salts, metals and inorganic eutectics. Three most suitable hydrated salts and inorganic eutectics for storing thermal energy are presented as well. Furthermore, it is considered an encapsulation process, which can improve the thermo-physical properties of the phase changing material. The use of a phase changing material is presented as well. Phase change materials can be used in many applications, however there are presented only a few, such as: in buildings, for the solar heating of water, for the transport of temperature sensitive substances and in biomedicine. In conclusion, with help of the software package MathCad, calculations of absorbed and released heat of phase changing material in the pipe heat exchanger at the inflow and outflow of hot and cold water, which we call the process of charging and discharging phase changing materials with heat, are made. fazno spreminjajoča snov (FSS) akumulator toplote latentna topilna toplota enkapsulacija uporaba FSS phase change materials (PCMs) heat accumulators latent heat storage (LHS) encapsulation PCM applications true true false [G. Fakin] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2014-08-22 14:59:08 2014-09-09 08:10:28 2022-05-15 03:07:01 2021-05-02 03:29:12 2014 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 536.7:544.338(043.2) 18248982 URN:SI:UM:DK:S9YGIWKI UNI_Fakin_Gregor_2014.pdf UNI_Fakin_Gregor_2014.pdf 1 AD5605587CF8280878D0D5BBC3EEA5B1 bc6fe2c26ceafb88c74977045fdb32a5bbaacef3944b876a61ca2e4f586b42fb 0f58d7fa-7c0b-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=65571 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0