Properties of vacuum insulation panels: results from experimental investigations at NRC Canada

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ConferenceProceedings of the Joint NSC-NRC Workshop on Construction Technologies: 26 April 2004, Taipei, Taiwan
Pages147156; # of pages: 10
Subjectvacuum insulation, high-performance thermal insulation, long-term performance; Insulation
AbstractMany samples of commercially available vacuum insulation panels were tested in the laboratory to determine their physical properties such as thermal resistance, water vapour permeance of the foils and sorption characteristics of the core material. The effect of various exposure conditions, which includes 32 ºC, relative humidity up to 90 % and 5 bar over-pressure, on the thermal resistance was determined. Also, the edge effects when panels were put side by side were evaluated. The performance of the sealing foils and seams in the manufactured products was checked in terms of water vapour permeance and air permeance. The tested products seem to with stand major environmental loads. High humidity, higher temperature and even higher pressure have not significantly changed their thermal resistances in two years. Air permeance across the foils is immeasurably low. Water vapour does permeate, albeit at a very low rate(1 to 3 ng m-2 s-1 Pa-1), across the foils and seams. However, precipitated silica as a core material has appreciable capacity to adsorb and store water molecules. Though the central portions of the panels show remarkable thermal resistances, the edge effect for the same reason is significant. The joining point of the four corners of four high performance panels is only as efficient as a high performance cellular plastic insulation.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number47055
NPARC number20377455
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Record identifier1d400d45-9fa5-4a86-a2c1-6019b47db46c
Record created2012-07-24
Record modified2016-05-09
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