A. Stonkuvienė “Investigation of heat flow through thermal insulation layers with heat-conductive connectors” doctoral dissertation defence

Thesis Defense

Author, Institution: Aurelija Stonkuvienė, Kaunas University of Technology

Science area, field of science: Technological Sciences, Civil Engineering, T002

Scientific Supervisor: Prof. Dr. Raimondas Bliūdžius (Kaunas University of Technology, Technological Sciences, Civil Engineering, T002)

 Dissertation Defence Board of Civil Engineering Science Field:
Prof. Dr. Žymantas Rudžionis (Kaunas University of Technology, Technological Sciences, Civil Engineering, T002) – chairman
Assoc. Prof. Dr. Gabriel Beko (Technical University of Denmark, Technological Sciences, Civil Engineering, T002)
Prof. Habil. Dr. Gintautas Miliauskas (Kaunas University of Technology, Technological Sciences, Energetics and Power Engineering, T006)
Dr. Saulius Vaitkus (Vilnius Gediminas Technical University, Technological Sciences, Materials Engineering, T008)
Prof. Dr. Tadas Ždankus (Kaunas University of Technology, Technological Sciences, Civil Engineering, T002)

The dissertation defence takes place online.

The doctoral dissertation is available at the library of Kaunas University of Technology (K. Donelaičio g. 20, Kaunas).


Improving the energy efficiency of buildings is a relevant challenge for reducing consumption of fossil energy and carbon emissions. When the energy consumption of energy-efficient, near-zero energy buildings has decreased several times over the last decade, the insufficiently accurate estimates of heat loss through envelopes can lead to unreasonably higher amounts of thermal insulation and other building materials and more powerful and expensive building engineering systems. An approximate standard analytical method is often used to assess heat transfer in building facades with metal connectors crossing thermal insulation layers. Significant differences of up to 1.5 times were found, comparing the heat transmittance coefficients calculated by the approximate empirical formula and experimentally measured wall structures with connectors, especially with high thermal conductivity rectangular connectors. The aim of the dissertation is to investigate the heat flow through thermal insulation layers crossed by heat-conductive connectors and clarify this dependence on the geometric and thermal characteristics of the layer’s materials. Investigations of heat transfer through facade fragments with connectors were performed using the experimental “hot box” method and using the computer program HEAT3 for calculating temperature fields. The results of the study substantiate the suitability of the empirical formula for calculating heat transfer through envelopes with heat-conductive connectors, and the formula of the standard calculation procedure was revised by coefficients calculated according to the determined quantitative dependencies.


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