Određivanje koeficijenta prolaska topline elemenata vanjske ovojnice zgrade korištenjem infracrvene termografije

doctoral thesis

• Title (english): Determination of thermal transmittance of building elements using infrared thermography
• Author: Mergim Gaši
• Mentor: Bojan Milovanović (mentor)
• Committee member: Ivan Gabrijel (predsjednik povjerenstva)
• Committee member: Bojan Milovanović (član povjerenstva)
• Committee member: Neven Ukrainczyk (član povjerenstva)
• Granter: University of Zagreb; Faculty of Civil Engineering; Zagreb
• Defense date and country: 2023-09-22, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Civil Engineering
• Universal decimal classification (UDC): 624/625 - Civil and structural engineering. Civil engineering of land transport. Railway engineering. Highway engineering

Abstract

Najveći dio potrošnje energije u zgradama otpada na transmisijske toplinske gubitke. Tradicionalni načini određivanja tih gubitaka svode se na određivanje koeficijenta prolaska topline (U-vrijednosti) pojedinih elemenata zgrade u stacionarnim uvjetima koji se u stvarnosti nikada ne ostvare. Ta U-vrijednost ne uzima u obzir akumulaciju topline u elementima, degradaciju materijala uslijed efekta starenja, dinamiku prijenosa topline na površini uslijed strujanja zraka te energiju koja se zračenjem prenosi iz okoliša na promatranu površinu. Glavni cilj ovog rada je odrediti U-vrijednost pojedinih građevinskih elemenata zgrade korištenjem infracrvene termografije te izmjerenih parametara koji opisuju okoliš koji odvaja promatrani element. Tako određena U-vrijednost koristila bi se kako bi se realnije opisale energetske potrebe zgrade u cilju smanjenja potrošnje energije, za kontrolu izvedenog stanja novih zgrada te analizu stanja ovojnice postojećih zgrada prije energetske obnove.

Abstract (english)

The largest part of energy consumption in buildings are transmission heat losses. Traditional ways of determining these losses are done using the heat transfer coefficient (U-value) of building elements in stationary boundary conditions that are never achieved. This U-value does not take into account the heat accumulated in the elements, the degradation of materials due to the effect of aging, the dynamics of heat transfer on the surface due to air flow and the energy radiated from the environment. The main goal of this research is to determine the U-value of building elements using infrared thermography, and measured parameters that describe the environment that separates the observed element. The U-value determined in this way would be used to describe the energy needs of the buildings more realistically in order to reduce energy consumption, to assess energy needs of new buildings and to analyse the existing building’s envelope in terms of heat losses before energy renovation.

• Keywords: U-vrijednost; infracrvena termografija (ICT); prividna reflektirana temperatura; tokomjerna metoda (HFM); granični sloj; ambijentalna temperatura; srednja temperatura zračenja.
• Keywords (english): U-value; infrared thermography (IRT); apparent reflected temperature; HFM method; boundary layer; ambient temperature; mean radiant temperature
• Language: croatian
• URN:NBN: urn:nbn:hr:237:794501
• Promotion: 2023
• Study programme: Title: Postgraduate doctoral study of the Faculty of Civil Engineering; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, područje tehničkih znanosti, polje građevinarstvo (doktor/doktorica znanosti, područje tehničkih znanosti, polje građevinarstvo)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-10-04 08:23:31