New Metallized Laminates with AI Foil-like Air Permeation
The rate of air permeation (Permeability) through the envelope almost solely determines the degradation rate of fiberglass VIPs.It also has a critical effect on the degradation rate of fumed silica panels in building applications.In order to ensure a much slower degradation rate for both applications,a new generation of ultra high barrier laminates has recently been developed.These are based on the synergistic effect between EVOH films and advanced types of vacuum deposited Al layers.The Permeability of the new laminates at ambient were found to be as low as 1.6cc/m2year,which is 4 to 6 times lower than the best standard metallized films.The corresponding pressure increase rate for a 12mm thick panel is as low as 0.1mbar/year,similar to the annual pressure increase when Al foil laminates are used.The article describes these new films and also contains a description of several new techniques for measuring the degradation rates of panels with a large spectrum of laminates and core materials.These new techniques allow very easy,fast and accurate determination of the λ-P curve of any core material Using these advanced techniques the air permeation rate as function of temperature and relative humidity of many types of films was measured and the results are shown in the article.All films showed Arrhenius-like dependence of the permeability on temperature with different values for the activation energy.The results of this permeation measurement were used to create useful lifetime Excel calculators that accurately predict the increasing values of the thermal conductivity of fiberglass cores installed in refrigerators.It was found that by using the new A1 foil-like films,the effective thermal conductivity of installed panels can be kept below 7mW/(m · K)for more than 15 years.
vacuum insulation panels high barrier laminates permeability life time calculator
Yoash Carmi Eddie Shufer Liat Suari
Hanita Coatings RCA, Ltd.Hanita, 2288500, Israel
国际会议
The 12th International Vacuum Insulation Symposium (IVIS 2015)(第十二届国际真空绝热材料会议)
南京
英文
108-113
2015-09-01（万方平台首次上网日期，不代表论文的发表时间）