diplomska naloga
Urška Kocjančič (Avtor), Aleš Krainer (Mentor), Matjaž Četina (Član komisije za zagovor), Janko Logar (Član komisije za zagovor), Boštjan Brank (Član komisije za zagovor), Jože Peternelj (Komentor)

Povzetek

Fazno spremenljiv material v visokoizolativnem tankoslojnem stavbnem ovoju

Ključne besede

gradbeništvo;diplomska dela;UNI;fazno sprejemljiv material (PCM);latentno shranjevanje toplote;poletno pregrevanje stavb;ocena časa taljenja plasti PCM;tankoslojni stavbni ovoj;

Podatki

Jezik: Slovenski jezik
Leto izida:
Izvor: Ljubljana
Tipologija: 2.11 - Diplomsko delo
Organizacija: UL FGG - Fakulteta za gradbeništvo in geodezijo
Založnik: [U. Kocjančič]
UDK: 621.742.4(043.2)
COBISS: 5538913 Povezava se bo odprla v novem oknu
Št. ogledov: 1919
Št. prenosov: 950
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Angleški jezik
Sekundarni naslov: Phase change material in thermally insulated lightweight building envelope
Sekundarni povzetek: In my thesis I treat one of the possibilities of latent heat storage. I have used the phase-change materials (PCM), which are apropriate to be built in passive solar systems. When PCM are changing their phase from liquid to solid state or vice versa, they absorb or emit the heat at constant temperature. Therefore they can be used as stabilisers of temperature and during summer they can prevent the overheating of buildings. I present exisiting and tested construction complexes with different PCM systems that are integrated in walls, ceilings and floors. For the chosen example of modular facade system the most fitting position of PCM layer in the construction element is determined, based on calculated time of PCM melting. Estimated time of melting is determined with simplified Stefan or moving boundary problem. This goes for the case, where at the beginning the whole layer of PCM is in solid phase in thermal balance at temperature of phase change. Later, when the temperature at the surface of constructon complex is raised, the PCM starts melting. Firstly the outer surface melts and then the phase front, which seperates the areas of solid and liquid PCM, starts moving to the inside of PCM. Considering the summer temperature conditions, between three commercially accessible PCM the one with the most optimal temperature of phase transition was chosen, to ensure the heat comfort in the room. The analysis shows, that among tested PCMs, the most optimal slowdown of the response of the construction element on the temperature changes of the environment is, when using the layer of PCM with the temperature of phase transition around 21°C on the internal side of construction element. With high external and internal temperatures the melting of the chosen PCM is slow enough in order to maintain constant temperature of internal wall surface.
Sekundarne ključne besede: graduation thesis;civil engineering;phase change material (PCM);latent heat storage;summer overheating of the buildings;estimation of the time of PCM layer melting;lightweight building envelope;
Vrsta datoteke: application/pdf
Vrsta dela (COBISS): Diplomsko delo
Komentar na gradivo: Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Strani: X, 79 str., [2] f. pril.
Vrsta dela (ePrints): thesis
Naslov (ePrints): Phase change material in thermally insulated lightweight building envelope
Ključne besede (ePrints): fazno spremenljiv material (PCM);latentno shranjevanje toplote;poletno pregrevanje stavb;ocena časa taljenja plasti PCM;tankoslojni stavbni ovoj
Ključne besede (ePrints, sekundarni jezik): phase change material (PCM);latent heat storage;summer overheating of the builidings;estimation of the time of PCM layer melting;lightweight building envelope
Povzetek (ePrints): V diplomskem delu obravnavam eno od možnosti latentnega shranjevanja toplote. Uporabljeni so fazno spremenljivi materiali (PCM) primerni za vgraditev v pasivne solarne sisteme. Ker PCM absorbirajo oziroma oddajajo toploto pri prehodih agregatnega stanja trdno-tekoče oziroma tekoče-trdno ob konstantni temperaturi, so v stavbnem ovoju uporabni kot stabilizatorji temperature v prostorih. V poletnem času na primer lahko preprečujejo pregrevanje stavbe. Prestavljeni so že izdelani ter preizkušeni konstrukcijski sklopi z različnimi PCM sistemi integriranimi v stene, strop in tla. Za izbran primer modularnega fasadnega sistema, je na podlagi izračunanega časa taljenja PCM določen najbolj primeren položaj plasti PCM v konstrukcijskem sklopu. Ocena časa taljenja je določena s poenostavljenim Stefanovim problemom ali problemom s pomično mejo za primer, ko je na začetku celotna plast PCM v trdnem agregatnem stanju v toplotnem ravnotežju pri temperaturi faznega prehoda, nato pa na robni ploskvi konstrukcijskega sklopa temperaturo nenadoma povišamo. PCM se začne taliti. Najprej se stali robna ploskev PCM, nato pa meja, ki ločuje območje trdnega in območje tekočega PCM potuje v notranjost plasti PCM. Glede na poletne temperaturne razmere je med tremi komercialno dostopnimi PCM izbran tisti z najbolj optimalno temperaturo faznega prehoda za zagotavljanje toplotnega udobja v prostoru. Analiza pokaže, da med preizkušenimi PCM, plast PCM s temperaturo faznega prehoda okoli 21°C na notranji strani konstrukcijskega sklopa najbolj upočasni odzivanje konstrukcijskega sklopa na spremembe temperature okolice. Ob visokih zunanjih in notranjih temperaturah se izbran PCM tali dovolj počasi, da preko dneva ohranja konstantno temperaturo notranje obodne površine.
Povzetek (ePrints, sekundarni jezik): In my thesis I treat one of the possibilities of latent heat storage. I have used the phase-change materials (PCM), which are apropriate to be built in passive solar systems. When PCM are changing their phase from liquid to solid state or vice versa, they absorb or emit the heat at constant temperature. Therefore they can be used as stabilisers of temperature and during summer they can prevent the overheating of buildings. I present exisiting and tested construction complexes with different PCM systems that are integrated in walls, ceilings and floors. For the chosen example of modular facade system the most fitting position of PCM layer in the construction element is determined, based on calculated time of PCM melting. Estimated time of melting is determined with simplified Stefan or moving boundary problem. This goes for the case, where at the beginning the whole layer of PCM is in solid phase in thermal balance at temperature of phase change. Later, when the temperature at the surface of constructon complex is raised, the PCM starts melting. Firstly the outer surface melts and then the phase front, which seperates the areas of solid and liquid PCM, starts moving to the inside of PCM. Considering the summer temperature conditions, between three commercially accessible PCM the one with the most optimal temperature of phase transition was chosen, to ensure the heat comfort in the room. The analysis shows, that among tested PCMs, the most optimal slowdown of the response of the construction element on the temperature changes of the environment is, when using the layer of PCM with the temperature of phase transition around 21°C on the internal side of construction element. With high external and internal temperatures the melting of the chosen PCM is slow enough in order to maintain constant temperature of internal wall surface.
Ključne besede (ePrints, sekundarni jezik): phase change material (PCM);latent heat storage;summer overheating of the builidings;estimation of the time of PCM layer melting;lightweight building envelope
ID: 8312087