18 KB465 KB16 KB200020242012Charvat, PavelMauder, TomasOstry, Milanštevilka:3letnik:46str. 239-242ISSN:1580-2949COBISSID:933802URN:URN:NBN:SI:doc-00UPOACHenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijefazni prehodihranjenje toplotelatent-heat storagelatentna toplotamodelmodeliphase changeSimulation of latent-heat thermal storage integrated with room structures| Simulacija hranjenja latentne toplote, integrirane v sobnih strukturah|The phase change of a material is accompanied by a release or absorption of a considerable amount of heat. That makes a phase change a phenomenon effectively usable in various thermal storage applications. There are many materials with a melting temperature lying within the thermal comfort range for indoor environments. These materials can be utilized in building-integrated thermal storage. The performance of such latent-heat thermal storage integrated with the room structures was investigated through numerical simulations and experiments. The studied case involved two adjacent rooms of the same dimensions. The hydrated-salt-based phase-change material (PCM) was used as a thermal storage medium. A comparative approach was adopted in which the internal structures of one of the rooms contained the PCM, while the structures in the other room did not. The simulation model of the rooms was created in the numerical simulation tool TRNSYS 17, and this model was coupled with a PCM model created in MATLAB. The enthalpy method was used for the simulation of the phase change. This approach allowed for different time steps in the room model and the PCM model (the time step in the PCM model needed to be much shorter). The data from the real-scale experiments (ventilation rates, temperature of supply air, outdoor temperature, solar radiation intensity, etc.) as well as the physical properties of the PCM acquired in the laboratory testing were used as inputs to the simulation models. The analysis of the results was carried out, in which the simulation results were compared with the experimentally obtained dataFazno spremembo materiala spremlja sproščanje ali absorpcija velike količine toplote. Zato je fazna sprememba pojav, ki se lahko na različne načine učinkovito uporablja s hranjenjem toplote. Obstaja več vrst materialov, ki imajo tališče v toplotnem razponu, ki velja za notranje prostore. Ti materiali se lahko uporabljajo v hranilnikih toplote, ki se integrirajo v konstrukcije. Številne numerične simulacije in eksperimenti so že bili izvedeni za ocenjevanje učinkovitosti takšnih hranilnikov latentne toplote, ki so integrirani v sobne strukture. Obravnavani primer je vključeval dva sosednja prostora enakih dimenzij. Fazno spremenljiv material (PCM), ki temelji na hidratirani soli, je bil uporabljen kot sredstvo shranjevanja toplote. Uporabljen je bil primerjalni način, pri katerem so notranje strukture v enem prostoru vsebovale PCM, medtem ko ga strukture v drugem prostoru niso. Simulacijski model prostorov je bil izveden z orodjem za simulacije TRNSYS 17, ta model pa je bil združen z modelom PCM, ki je bil ustvarjen v laboratoriju MATLAB. Za simulacijo fazne spremembe je bila uporabljena metoda entalpije. S tem načinom je bilo mogoče ustvariti stopnje v prostorskem modelu in modelu PCM z različnimi časovnimi dimenzijami (časovna stopnja v modelu PCM je morala biti znatno krajša). Podatki, ki so bili pridobljeni iz eksperimentov v realnem stanju (razmerja prezračevanja, temperatura dovodnega zraka, zunanja temperatura, intenzivnost sončnega sevanja itd.), ter fizične lastnosti materialov PCM, ki so bili pridobljeni pri laboratorijskih preizkusih, so bili uporabljeni kot vhodni podatki za simulacijske modele. Izvedena je bila analiza podatkov, kjer so se rezultati simulacije primerjali s podatki, pridobljenimi med eksperimentiTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije