A transient method to measure the temperature-dependent thermal conductivity of polyurethane foam in district heating pipes

Charlotte Reidhav, Johan Claesson & Charlotte Reidhav
The thermal conductivity of the insulating polyurethane foam in district heating pipes is an important factor when improving the competitiveness of district heating, especially in areas of low heat density, where flexible district heating pipes are widely used. The standardised methods to measure the thermal conductivity of straight pipes are not applicable due to the small pipe dimensions and the fact that they are coiled. The paper presents a new transient method to determine the...
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