Comparison of Various Analysis Methods Based on Heat Flowmeters and Infrared Thermography Measurements for the Evaluation of the In Situ Thermal Transmittance of Opaque Exterior Walls

Choi, Doo Sung; Ko, Myeong Jin

doi:10.3390/en10071019

Cited by 30 publications

(14 citation statements)

References 25 publications

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“…The quantitative thermography method provides a measure of the overall transmittance of façades in a short period of time. There is increasing interest in this method [13,[21][22][23][24][25][26][27][28].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Review of criteria for determining HFM minimum test duration

Gaspar

Casals

Gangolells

2018

Energy and Buildings

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The actual thermal behaviour of façades is important to identify suitable energy-saving measures and increase the energy performance of existing buildings. However, the accuracy of in situ measurements of façades' U-values varies widely, mostly due to inadequate test durations. The aim of this paper was to evaluate the minimum duration of in situ experimental campaigns to measure the thermal transmittance of existing buildings' façades using the heat flow meter method, and to analyse the thermal performance of the façade during the test. Minimum test duration was determined according to data quality criteria, variability of results criteria, and standardized criteria for different ranges of theoretical thermal transmittance and for the same range of average temperature difference. Then, the minimum test duration results were compared. The findings show that ISO criteria are more sensitive and provide more accurate results, requiring a longer test duration. However, when certification is not required, the duration of the test could be reduced by applying data quality and variability of results criteria. The minimum duration of experimental campaigns depends on the theoretical thermal transmittance and the stability of climatic conditions. Moreover, results are more accurate when the dynamic method is used.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Review of criteria for determining HFM minimum test duration

Gaspar

Casals

Gangolells

2018

Energy and Buildings

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“…U posljednje vrijeme metoda ICT je sve više primjenjivana u području energetske učinkovitosti, kako za ocjenjivanje prihvatljivosti primijenjenih rješenja, tako i za pronalaženje nedostataka u elementima zgrade -pukotina [3] i mjesta s povećanom vlažnosti [4]. Metodu je čak moguće i koristiti za in situ određivanje koeficijenta prolaska topline (U-vrijednosti) [5][6][7]. IC termografija je beskontaktna metoda mjerenja temperature i njezine raspodjele na površini tijela.…”

Section: Uvodunclassified

Quantification of linear thermal bridges using infrared thermography method

Gaši¹,

Milovanović²

2018

4th Symposium on Doctoral Studies in Civil Engineering

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Među najvažnijim parametrima za proračun toplinskih gubitaka u zgradi zasigurno su koeficijent prolaska topline, U, i duljinski koeficijent prolaska topline Ψ. U ovom radu se za određivanje koeficijenta Ψ koristi metoda infracrvene termografije (ICT), i to za postojeće zgrade sa stvarnim utjecajima toplinskih mostova. Rezultat mjerenja je termogram iz kojeg je moguće očitati parametre potrebne za kvantificiranje utjecaja toplinskog mosta, uz istovremeno mjerenje temperature unutrašnjeg i vanjskog zraka. Tom metodom se na jednostavan, brz i učinkovit način mogu odrediti stvarni toplinski gubitci kroz najslabija mjesta na vanjskoj ovojnici zgrade-toplinske mostove.

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“…These methods have been widely studied in the literature and there are several studies in which the validity of their use is compared [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Determining the U-Value of Façades Using the Thermometric Method: Potentials and Limitations

et al. 2018

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Abstract:The thermal transmittance of building envelopes determines to a large extent the energy demand of buildings. Thus, there is a keen interest in having methods which can precisely evaluate thermal transmittance. From a scientific point of view, this study analyses the viability of the application of the thermometric method (THM), one of the most used methods in Spain. For this purpose, the test method has been improved by determining the adequate test conditions, the selection and installation of equipment, data acquisition and post-processing, and the estimation of uncertainty. We analyse eight case studies in a Mediterranean climate (Csa) to determine the potentials and limitations of the method. The results show that the values obtained through THM are valid under winter environmental conditions with relative uncertainties between 6% and 13%, while difficulties to perform the test in optimal conditions, and therefore to obtain valid results in warmer seasons, are detected. In this regard, the case studies which obtained a greater number of observations by performing the filtrate conditions were able to obtain representative results. Furthermore, there are significant differences depending on the kind of equipment and probes used during the experimental campaign. Finally, in warm climate regions a data filtrate can be considered for observations of a temperature difference higher than 5 • C, obtaining valid results for the case studies, although the rise in the thermal gradient can guarantee a greater stability of data.

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Comparison of Various Analysis Methods Based on Heat Flowmeters and Infrared Thermography Measurements for the Evaluation of the In Situ Thermal Transmittance of Opaque Exterior Walls

Cited by 30 publications

References 25 publications

Review of criteria for determining HFM minimum test duration

Review of criteria for determining HFM minimum test duration

Quantification of linear thermal bridges using infrared thermography method

Determining the U-Value of Façades Using the Thermometric Method: Potentials and Limitations

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