Izdelava računalniškega programa za izračun difuzije vodne pare po standardu SIST EN ISO 13788 : diplomska naloga

Svetina, Kristjan (author), Košir, Mitja (mentor)

S problemom nastajanja plesni in prekomerne vlage se soočamo tako v bivalnih kot tudi delovnih in drugih prostorih. Naš namen je bil preučiti zakonodajo z vidika kondenzacije, posebej pa smo se osredotočili na standarda SIST EN ISO 13788:2002 in SIST EN ISO 13788:2013. Standard SIST EN ISO 13788:2002 opisuje metode za izračun notranjih temperatur na površini konstrukcijskih sklopov ali sestavnega dela konstrukcijskega sklopa, pod katero nastaja plesen, in ocene tveganja kondenzacije zaradi difuzije vodne pare. Preučili pa smo tudi prenovljeni standard, SIST EN ISO 13788:2013, ki ima dodan še primer določitve notranje temperature zraka in relativne zračne vlažnosti, vsebuje pa tudi primere izračunov konstrukcijskih sklopov, ki vsebujejo vmesne zračne plasti, in primer izračuna izsuševanja vlage, ki je bila vnesena med izvedbo konstrukcijskega sklopa. Na osnovi omenjene dokumentacije smo izdelali program in ga poimenovali PIDVP. Program omogoča izračun difuzije vodne pare in ocene tveganja nastanka plesni ter nastajanja kondenzacije na površini in znotraj konstrukcijskega sklopa. Prav tako smo vključili tudi izračune za določitev notranje temperature in vlažnosti zraka. Pomagalo ne vsebuje možnosti izračuna za primer konstrukcije, ki vsebuje zračne plasti in izračuna za določitev časa izsuševanja vlage, ki je bila vgrajena med izgradnjo konstrukcije. Vsi primeri izračunov iz standarda SIST EN ISO 13788:2002 so bili ponovno izračunani s pomočjo tega programa. Dva dodatna primera (za streho in za steno) sta bila izračunana s pomočjo izdelanega programa ter programa KI Energija 2014. Primerjava izračunov je prikazana v preglednicah, kjer je posebej izpostavljeno ujemanje rezultatov. Ugotovljeno je bilo, da pri primerjavi rezultatov prihaja do zanemarljivih odstopanj. Le v dodatnem primeru za steno prihaja pri izračunu stopnje kondenzacije v mesecu aprilu do večjih odstopanj med rezultati novo izdelanega programa (program predvideva, da v eni od ravnin še vedno prihaja do kondenzacije) in rezultati programa KI Energija 2014 (program predvideva, da v isti ravnini poteka izsuševanje kondenzirane vodne pare). Na podlagi analize primerjav izračunov lahko sklepamo, da novo izdelani program deluje pravilno. Po analizi, ki je opisana, predvidevamo, da je do odstopanja v mesecu aprilu prišlo le zaradi drugačnega načina izračuna stopnje kondenzacije.

• Language: Slovenian
• Keywords: gradbeništvo, diplomska naloga, UNI, kondenzacija, difuzija, plesni, vlažnost, gradbeni objekti, izračuni, načrtovanje
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Place of publishing: Ljubljana
• Publisher: [K. Svetina]
• Year: 2015
• Number of pages: XVIII, 72 str., 2 pril.
• PID: 20.500.12556/RUL-73722
• COBISS.SI-ID: 7361633
• Publication date in RUL: 01.12.2015

Secondary language

• Language: English
• Title: Programme development for the calculation of water vapour diffusion according to SIST EN ISO 13788 standard

Abstract

Mould growth and excess moisture pose problems in residential as well as working and other spaces. Our purpose was to study legislation regarding condensation, in particular the SIST EN ISO 13788:2002 and SIST EN ISO 13788:2013 standards. SIST EN ISO 13788:2002 standard describes calculation methods for the internal surface temperatures of a building component or building elements below which mould growth is likely as well as risk assessment of condensation due to water vapour diffusion. We have also studied the revised SIST EN ISO 13788:2013 standard which includes an example of determining internal air temperature and relative air humidity as well as examples for calculating building components which contain intermediary air layers and an example of calculating the drying of moisture which was generated during the execution of the building component. On the basis of the aforementioned documentation, we have devised a programme and named it PIDVP. The programme enables the calculation of water vapour diffusion as well as an assessment for the risk of mould growth and condensation formation on the surface and inside the building component. We have also included calculations for determining internal temperature and air humidity. The tool does not include the possibility to make calculations for a construction which contains air layers and calculations to determine the drying time of moisture which was generated during the construction. All examples of calculations from the SIST EN ISO 13788:2002 standard have been recalculated with the help of this programme. Two additional examples (for the roof and wall) were calculated with the help of the devised programme and KI Energija 2014 programme. The comparison of calculations is shown in the tables which particularly display the compliance of the results. It has been determined that there were only negligible deviations when comparing the results. There were bigger deviations only in the additional example for the wall when calculating the level of condensation in April if we compare the results of the newly devised programme (which foresees the condensation formation in one of the planes) and the results from KI Energija 2014 programme (which foresees the drying of the condensed water vapour in the same plane). On the basis of the calculation comparisons analysis, it can be concluded that the newly developed programme works correctly. According to the described analysis we can conclude that the deviations in the month of April were only due to a different method of condensation level calculation.

• Keywords: graduation thesis, condensation, condensation, diffusion, mould, humidity, construction objects, calculations, planning