Thermal Bridge Developement for Uneven surfaces
Mesele, Sisay (2012)
Arcada - Nylands svenska yrkeshögskola
2012
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-2012062012912
https://urn.fi/URN:NBN:fi:amk-2012062012912
Tiivistelmä
Abstract:
A conductive particulate filled polymer composite is developed by blending Alumunium oxide (Al2O3) powder as a conductive filler with various proportions by weight (5,10,15,20,30,40)%wt and Silicone resin as a matrix for thermal bridging application. The material is to be mounted between wall surfaces and flux-meter that was developed at Arcada to measure energy in the form of heat-flux in buidings.
Most building surfaces are rough and hold air as thermal insulator and this has a significant effect to create a reading error for the device to give exact value due to the fact that, the rough surface holds air creating a thermal resistance. In order to avoid this thermal insulation by air, kair=0.0027W/m2.K, the composite material has to fill the rough surface to enhance thermal conductivity between the surfaces.
The compostion materials were selected based on the application requirement to have characteristics of good thermal conductivity,surface comformablity, soft,flexible, self tacky and user freindly to the wall without leaving a stain on the area.
Thermal conductivity of samples based on theoretical models were calculated and the result revealed as the amount of filler increased thermal conductivity increases and because of increased filler resulted in tough and hard material that incomplete comformation on the wall left air gaps to exist. All samples achieved to conform to surface irregularities, thereby eliminating air voids and improved heat flow through them to conduct heat from the wall surface to the flux meter by illumination of air contained.
A conductive particulate filled polymer composite is developed by blending Alumunium oxide (Al2O3) powder as a conductive filler with various proportions by weight (5,10,15,20,30,40)%wt and Silicone resin as a matrix for thermal bridging application. The material is to be mounted between wall surfaces and flux-meter that was developed at Arcada to measure energy in the form of heat-flux in buidings.
Most building surfaces are rough and hold air as thermal insulator and this has a significant effect to create a reading error for the device to give exact value due to the fact that, the rough surface holds air creating a thermal resistance. In order to avoid this thermal insulation by air, kair=0.0027W/m2.K, the composite material has to fill the rough surface to enhance thermal conductivity between the surfaces.
The compostion materials were selected based on the application requirement to have characteristics of good thermal conductivity,surface comformablity, soft,flexible, self tacky and user freindly to the wall without leaving a stain on the area.
Thermal conductivity of samples based on theoretical models were calculated and the result revealed as the amount of filler increased thermal conductivity increases and because of increased filler resulted in tough and hard material that incomplete comformation on the wall left air gaps to exist. All samples achieved to conform to surface irregularities, thereby eliminating air voids and improved heat flow through them to conduct heat from the wall surface to the flux meter by illumination of air contained.