Quantification of linear thermal bridges using infrared thermography method

Gaši, Mergim; Milovanović, Bojan

doi:10.5592/co/phdsym.2018.12

Cited by 1 publication

(2 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is the function of the air temperature, relative humidity (RH) and the distance between the IR camera and the examined surface. ε is surface emissivity, τ is the atmosphere's transmittance, and σ is Stefan-Boltzmann constant [20,21].…”

Section: Infrared Thermography (Irt)mentioning

confidence: 99%

See 1 more Smart Citation

Comparison of Infrared Thermography and Heat Flux Method for Dynamic Thermal Transmittance Determination

Gaši¹,

Milovanović²,

Gumbarević³

2019

Buildings

Self Cite

View full text Add to dashboard Cite

This paper proposes an alternative experimental procedure that uses infrared thermography (IRT) for measuring the surface temperature of building elements, through which it is possible to approximate the thermal transmittance or the U-value. The literature review showed that all authors used similar procedures that require semi-stationary heat transfer conditions, which, in most cases, could not be achieved. The dynamic and the average methods that are given in ISO 9869 were also used with the IRT and the heat flux method (HFM). The dynamic method (DYNM) shows a higher level of accuracy compared to the average method (AVGM). Since the algorithm of the DYNM is more complicated than that of the AVGM, Microsoft Excel VBA was used to implement the algorithm of the DYNM. Using the procedure given in this paper, the U-value could be approximated within 0–30% of the design U-value. The use of IRT, in combination with the DYNM, could be used in-situ since the DYNM does not require stable boundary conditions. Furthermore, the procedure given in this paper could be used for relatively fast and inexpensive U-value approximation without the use of expensive equipment (e.g., heat flux sensors).

show abstract

Section: Infrared Thermography (Irt)mentioning

confidence: 99%

“…the IR camera and the examined surface. ε is surface emissivity, τ is the atmosphere's transmittance, and σ is Stefan-Boltzmann constant [20,21]. Surface emissivity is mostly influenced by surface temperature, the wavelength of infrared radiation, and the angle at which the IR camera sees the surface.…”

Section: Infrared Thermography (Irt)mentioning

confidence: 99%