2327 KB50 KB195120262018Jagličić, ZvonkoKunič, RomanPajek, Lukaštevilka:letn. 67str. 51-62ISSN:0017-2774COBISSID_HOST:8369249URN:URN:NBN:SI:doc-O8R40QIDslZveza društev gradbenih inženirjev in tehnikov SlovenijeGradbeni vestnikfazno spremenljive snoviheat capacityPCMphase change materialstoplotna kapacitetaFazno spremenljive snovi (PCM) in njihova uporaba v stavbah| Phase change materials (PCM) and their application in buildings|The occurrence of thermal discomfort in new buildings without air conditioning during summer is becoming a common phenomenon. There are many possible rea- sons for this condition, one of them definitely being insufficient thermal capacity of building elements. Such overheating of buildings can be mitigated by using phase change material (PCM). PCM is used to considerably increase the thermal capacity of the construction, by only slightly increasing its mass. In such manner, indoor thermal comfort in buildings is improved. A comprehensive literature review showed that in the last decade the number of scientific papers dealing with the application of PCMs in buildings and the number of construction products with incorporated PCM has escalated. By using an elementary calculation, we showed how even a thin layer of PCM may contribute to improved thermal comfort. However, the melting temperature of PCM must be chosen within daily temperature fluctuations. Furthermore, we presented several types of PCMs and a number of examples how PCMs can be used in buildings. Phase change materials have the greatest efficiency, when they are integrated in the innermost part of the construction. This is how they can quickly respond to temperature fluctuations. In addition, it is important that PCM is not covered by any material having low thermal conductivityVse pogosteje opažamo, da je v poletnih mesecih brez uporabe klimatskih naprav v novejših stavbah neprijetno vroče. Za to obstaja vrsta razlogov, pri čemer je eden izmed njih zagotovo nezadostna toplotna kapaciteta konstrukcijskih sklopov. Ena rešitev problema je uporaba fazno spremenljivih snovi, znanih tudi pod okrajšavo PCM (angleško Phase Change Material). Z njimi povečamo toplotno kapaciteto konstrukcijskega sklopa ob zanemarljivem povečanju njegove mase, s tem pa izboljšamo toplotno ugodje v notranjem okolju. Pregled literature je pokazal, da je v zadnjem desetletju močno naraslo število raziskav, ki obravnavajo lastnosti PCM, in število izdelkov s PCM za uporabo v stavbah. V prispevku smo z enostavnim izračunom pokazali, da lahko že s tanko plastjo PCM ustvarimo razmere, ki nam ugajajo v stavbah z večjo toplotno kapaciteto. Pri tem moramo paziti, da ima PCM tališče pri temperaturi, okoli katere se najpogosteje dnevno spreminja temperatura zraka. Predstavili smo nekaj primerov različnih vrst fazno spremenljivih snovi in primerov njihove uporabe v gradbenih proizvodih. Fazno spremenljive snovi imajo največji učinek, če jih vgradimo v sloj konstrukcije, ki je čim bližje notranjosti, saj imajo tako hiter odzivni čas, ki je kos dnevnim spremembam temperature. Pomembno je tudi, da jih ne obdamo z materiali nizke toplotne prevodnostiTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaZveza društev gradbenih inženirjev in tehnikov Slovenije