Numerički proračun i analiza osjetljivosti toplinskih mostova kod LSF konstrukcija

master's thesis

• Title (english): Numerical calculation and sensitivity analysis of thermal bridges in LSF structures
• Author: Teodora Kragulj
• Mentor: Bojan Milovanović (mentor)
• Committee member: Ivana Banjad Pečur (predsjednik povjerenstva)
• Committee member: Bojan Milovanović (član povjerenstva)
• Committee member: Marija Jelčić Rukavina (član povjerenstva)
• Granter: University of Zagreb; Faculty of Civil Engineering; (Materials); Zagreb
• Defense date and country: 2024-02-15, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Civil Engineering

Abstract

U usporedbi s tradicionalnim građevinskim metodama, LSF sustav donosi značajne prednosti u područjima održivosti, ekonomske isplativosti, procesa izgradnje i sigurnosti na radu. Međutim, ove LSF elemente treba dobro dizajnirati i zaštititi od neželjenih toplinskih mostova uzrokovanih visokom toplinskom vodljivošću čelika. U ovom radu proučava se utjecaj LSF-a na izvedbu nZEB-a. Provedena je analiza rješenja toplinskih mostova korištenjem dostupnih numeričkih modela. Pri tome je proračunato 10 karakterističnih detalja. Analizirale su se učinkovitosti takvih struktura u pogledu njihovog toplinskog mosta na U-vrijednost neprozirnih dijelova ovojnice, linearnih gubitaka topline na spojevima, rizika od kondenzacije vlage, te toplinskog mosta na ukupne energetske performanse zgrade. Glavni zaključak je bio da se toplinski mostovi minimaliziraju zahvaljujući toplinskoj izolaciji koja pokriva čelične nosače, a u gotovo svim slučajevima Ψ-vrijednosti su ispod 0,1 W/(m·K) i slobodne su od kondenzacije vlage. Provedena je i analiza osjetljivosti nekoliko geometrija te nekoliko materijala, došlo je do zaključka da dodatna vanjska toplinska izolacija poboljšava toplinsku učinkovitost zgrade, te da je bolji čelični nosač sa što tanjim presjekom i što manjom duljinom. Rad sadržava i pregled literature vezano uz zgrade gotovo nulte energije, naročito u području aspekta energetske učinkovitosti i toplinskih mostova kod sustava zgrada koje integriraju LSF.

Abstract (english)

In comparison to traditional construction methods, the LSF system brings significant advantages in the areas of sustainability, economic viability, construction processes, and workplace safety. However, these LSF elements need to be well-designed and protected against undesired thermal bridges caused by the high thermal conductivity of steel. This study investigates the impact of LSF on the performance of nZEB. An analysis of thermal bridge solutions was conducted using available numerical models, calculating 10 characteristic details. The efficiencies of such structures were analyzed concerning their thermal bridge effect on the U-value of opaque envelope elements, linear heat losses at junctions, moisture condensation risk, and overall energy performance. The main conclusion was that thermal bridges are minimized thanks to thermal insulation covering steel studs, and in almost all cases, Ψ-values are below 0.1 W/(m·K) and free from moisture condensation. Sensitivity analysis of several geometries and materials concluded that additional external thermal insulation improves the building's thermal efficiency, and a better steel stud with a thinner cross-section and shorter length is preferable. The paper also includes a literature review related to nearly zero-energy buildings, particularly focusing on the aspect of energy efficiency and thermal bridges in systems integrating LSF.

• Keywords: LSF sustavi; energetska učinkovitost; toplinski mostovi; toplinska provodljivost; nZeb.
• Keywords (english): LSF Systems; Energy Efficiency; Thermal Bridges; Thermal Conductivity; nZeb.
• Language: croatian
• URN:NBN: urn:nbn:hr:237:444762
• Study programme: Title: Civil Engineering; specializations in: Construction Management, Transportation Engineering, Geotechnical Engineering, Hydraulic Engineering, Structural Engineering, Construction Materials, Theory and Modeling of Structures; Course: Construction Materials; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka građevinarstva (magistar/magistra inženjer/inženjerka građevinarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-03-15 09:30:53