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Analytical model to calculate the temperature increase in a low conductive material covered by a highly conductive layer

Pär Johansson (Institutionen för bygg- och miljöteknik, Byggnadsteknologi) ; Johan Claesson (Institutionen för bygg- och miljöteknik, Byggnadsteknologi)
Proceedings of the 10th Nordic Symposium on Building Physics, June 15-19, 2014, Lund, Sweden (2014)
[Konferensbidrag, refereegranskat]

There is a lack of measurement methods that can be used to determine the thermal conductivity of vacuum insulation panels (VIPs) on the construction site. With the transient plane heat source (TPS) method, the thermal properties of an isotropic material can be evaluated after a short measurement period. Heat is supplied in the TPS sensor which raises the temperature in the sensor. The thermal properties of the material are calculate based on the temperature increase. A novel analytical solution of the TPS method makes it possible to use the method on a low conductive material covered by a highly conductive layer. The aim of this study is to investigate the applicability of the analytical solution by comparing it to a numerical calculation model and TPS measurements. Five different setups were tested with good agreement between the analytical solution and the numerical calculation model. The TPS measurements deviated from the calculated temperature increase which could be explained by uncertainties regarding the influence of the contact surface between the sensor and material.

Nyckelord: TPS method, quality assurance, vacuum insulation panel, thermal conductivity, analytical solution, numerical model



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Denna post skapades 2014-02-14. Senast ändrad 2015-02-09.
CPL Pubid: 193776

 

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Institutioner (Chalmers)

Institutionen för bygg- och miljöteknik, Byggnadsteknologi (2005-2017)

Ämnesområden

Building Futures
Energi
Hållbar utveckling
Byggnadsteknik

Chalmers infrastruktur

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