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Journals / Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi / 2026 / Cilt: 40 Sayı: 1

Development of a standard laboratory testing method for thermal diffusivity measurements of building walls: Combined use of Infrared thermography and guarded hot box

Yapı duvarlarının ısıl yayınırlık ölçümleri için standart bir laboratuvar test yönteminin geliştirilmesi: Kızılötesi ısıl görüntüleme ve korumalı sıcak kutunun birlikte kullanımı

Rukiye Koçkar Tuğla(KASTAMONU ÜNİVERSİTESİ)0000-0001-9731-4206
Ayse Tavukcuoglu(ORTA DOĞU TEKNİK ÜNİVERSİTESİ)0000-0002-1529-9186
Salih Yazıcıoğlu(GAZİ ÜNİVERSİTESİ)0000-0002-6767-2026
Pages
529–540
Publication Date
2024-08-16
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The results show that the new experimental setup can directly measure the thermal diffusivity of a wall.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:The thermal diffusivity value of a building wall can be calculated theoretically by using the thermophysical properties of its materials listed in standards and literature.
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Key Findings & Data:A 19cm-thick wall sample made of lightweight concrete block with pumice aggregate and mortar was prepared; this wall is positioned between a controlled warm ambient on its one side and a cold ambient on the other side, where its surfaces were monitored by sequential IR imaging.
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Conclusion & Impact:The results show that the new experimental setup can directly measure the thermal diffusivity of a wall.
🔬Design:Araştırma Makalesi
📍Scope:Comprehensive Sample
⚙️Variables:Isıl yayınırlık · pomza agregalı hafif beton blok · kızılötesi ısıl görüntüleme

Abstract

The thermal diffusivity value of a building wall can be calculated theoretically by using the thermophysical properties of its materials listed in standards and literature. In these lists, building materials in the same category can be defined by different thermal properties; therefore, the theoretically-calculated thermal diffusivity values can be misleading. In this study, an experimental setup was developed that can directly measure the thermal diffusivity (α) value of building walls by the combined use of infrared thermography and guarded hot box methods. A 19cm-thick wall sample made of lightweight concrete block with pumice aggregate and mortar was prepared; this wall is positioned between a controlled warm ambient on its one side and a cold ambient on the other side, where its surfaces were monitored by sequential IR imaging. The thermal diffusivity value of the sample wall was calculated using the data showing temperature change versus time and the relevant theoretical equation. The reference thermal diffusivity value (αREF) of the sample wall, calculated using thermal properties measured by standard laboratory tests, is 3.4014x10-7 m2/s. The thermal diffusivity (αIRT) of the same wall, measured with the proposed IRT-GHB experimental setup, is 3.3813x10-7 m2/s. The value measured with that new setup is similar to the reference thermal diffusivity value. The results show that the new experimental setup can directly measure the thermal diffusivity of a wall. Compared to the existing ones, the proposed experimental setup presents a measurement technique that saves time and sets the basis of a scientific, practical, and more economical analytical method.

Özet

Bir yapı duvarının ısıl yayınırlık değeri, bu duvarı oluşturan malzemelerin standartlarda ve/veya basılı yayınlarda listelenen termofiziksel özellikleri kullanılarak teorik olarak hesaplanabilmektedir. Bu listelerde, aynı kategoride yer alan yapı malzemeleri, farklı ısıl özellikleri ile tanımlanabilmekte; dolayısıyla teorik olarak hesaplanan ısıl yayınırlık değerleri, yanıltıcı olabilmektedir. Bu çalışmada, kızılötesi ısıl görüntüleme ve mahfazalı sıcak kutu yöntemleri bir arada kullanılarak yapı duvarlarının ısıl yayınırlık (α) değerini doğrudan ölçebilen bir deney düzeneği geliştirilmiştir. Pomza agregalı hafif beton blok ve harç ile 19cm kalınlığında bir duvar örneği hazırlanmış; bu duvar iklim koşulları takip edilen korunaklı sıcak ortam ve ardışık ısıl görüntüleme ile takip edilen soğuk ortam arasına yerleştirilmiştir. Örnek duvarın ısı yayınırlık değeri, zamana karşı sıcaklık değişimi verileri ve ilgili teorik denklem kullanılarak hesaplanmıştır. Bu duvarın standart laboratuvar testleri ile belirlenen ısıl özellikleri esas alınarak hesaplanan referans ısı yayınırlık değeri (αREF) 3,4014x10-7 m2/s’dir. Aynı duvarın, önerilen IRT-GHB deney düzeneği ile ölçülen ısıl yayınırlık değeri (αIRT) 3,3813x10-7 m2/s’dir. Yeni düzenek ile ölçülen değer, referans ısıl yayınırlık değeri ile benzerdir; sonuçlar, yeni deney düzeneğinin bir duvarın ısıl yayınırlık değerini doğrudan ölçebildiğini göstermiştir. Bu düzenek, mevcut ölçüm tekniklerine kıyasla zaman kazandıran ve ölçümler için mali yükü azaltan, bilimsel ve pratik bir analiz yönteminin temelini oluşturmaktadır.

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Cite This Article

Tuğla, R. K., Tavukcuoglu, A., Yazıcıoğlu, S. (2024). Development of a standard laboratory testing method for thermal diffusivity measurements of building walls: Combined use of Infrared thermography and guarded hot box. Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi, Cilt: 40 Sayı: 1, 529–540. https://doi.org/10.17341/gazimmfd.1296046

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