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

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...

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Bibliographic Details
Published in:Buildings (Basel) 2019-05, Vol.9 (5), p.132
Main Authors: Gaši, Mergim, Milovanović, Bojan, Gumbarević, Sanjin
Format: Article
Language:English
Subjects:
Algorithms
Approximation
average method
Boundary conditions
Building components
Data analysis
Design
dynamic method
Energy consumption
Fluctuations
Heat conductivity
Heat flux
heat flux method
Heat transfer
Infrared imaging
infrared thermography
Literature reviews
Methods
natural convection
Radiation
Sensors
Surface temperature
Temperature
thermal transmittance
Thermocouples
Thermography
Transmittance
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Summary: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).
ISSN:2075-5309
2075-5309
DOI:10.3390/buildings9050132