Combining Deep Learning and the Heat Flux Method for In-Situ Thermal-Transmittance Measurement Improvement

Sanjin Gumbarević, Bojan Milovanović, Bojana Dalbelo Bašić and Mergim Gaši
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Sanjin Gumbarević: Ericsson Nikola Tesla, Krapinska 45, 10000 Zagreb, Croatia
Bojan Milovanović: Faculty of Civil Engineering, University of Zagreb, 10000 Zagreb, Croatia
Bojana Dalbelo Bašić: Faculty of Electrical Engineering and Computing, University of Zagreb, 10000 Zagreb, Croatia
Mergim Gaši: Faculty of Civil Engineering, University of Zagreb, 10000 Zagreb, Croatia

Energies, 2022, vol. 15, issue 14, 1-19

Abstract: Transmission losses through the building envelope account for a large proportion of building energy balance. One of the most important parameters for determining transmission losses is thermal transmittance. Although thermal transmittance does not take into account dynamic parameters, it is traditionally the most commonly used estimation of transmission losses due to its simplicity and efficiency. It is challenging to estimate the thermal transmittance of an existing building element because thermal properties are commonly unknown or not all the layers that make up the element can be found due to technical-drawing information loss. In such cases, experimental methods are essential, the most common of which is the heat-flux method (HFM). One of the main drawbacks of the HFM is the long measurement duration. This research presents the application of deep learning on HFM results by applying long-short term memory units on temperature difference and measured heat flux. This deep-learning regression problem predicts heat flux after the applied model is properly trained on temperature-difference input, which is backpropagated by measured heat flux. The paper shows the performance of the developed procedure on real-size walls under the simulated environmental conditions, while the possibility of practical application is shown in pilot in-situ measurements.

Keywords: thermal transmittance; deep learning; machine learning; energy efficiency; building physics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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