Abstract
This article discusses an express control method that allows in situ measurements of the thermal conductivity of insulation materials. Three samples of the most common thermal insulation materials, such as polyurethane, extruded polystyrene, and expanded polystyrene, were studied. Additionally, optical and organic glasses were investigated as materials with a stable value of thermal conductivity. For the measurement of thermal conductivity, the express control device, which implements the differential method of local heat influence, was used. The case studies were focused on the reduction of fluctuations of the measured signals caused by different influencing factors using wavelet transform. The application of wavelet transform for data processing decreased the thermal conductivity measurement’s relative error for organic glass SOL and optical glasses TF-1 and LK-5. The application of wavelet transform thermal conductivity measurement data for polyurethane, extruded polystyrene, and expanded polystyrene allowed to reduce twice the duration of express control while maintaining the same level of measurement error. The results of the investigation could be used to increase the accuracy in express control of the thermal conductivity of insulation materials by improving the data processing. This approach could be implemented in software and does not require a change in the design of the measuring equipment or the use of additional tools.
Highlights
The need for economical treatment of energy consumption and energy savings has caused an increase in the demand for new insulation materials
The results presented in this paper demonstrate the possibility of the operational control of the thermal conductivity of insulation materials with an accuracy that is not inferior to laboratory research methods
Energies 2021, 14, 5223 presented in this paper demonstrate the possibility of the operational control of the thermal conductivity of insulation materials with an accuracy that is not inferior to laboratory research methods
Summary
The need for economical treatment of energy consumption and energy savings has caused an increase in the demand for new insulation materials. Steady-state methods are based on Fourier’s law Thermal conductivity in these methods is determined under steady-state heat flux passing through the sample by measuring the temperature difference in the case of guarded hot plates [1] and the heat flux in the case of heat flow meter apparatus [2,3]. These methods usually require relatively large samples, which allow studying porous materials and composites [3,4,5]. Experiments usually last from 3 to 8 h and the measurement error is 2–5% [1,2]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
