Methods for Evaluation of Thermal Conductivity Increase of VIPs
In order to determine the mean thermal conductivity of VIPs during service life time a common procedure is accelerated aging by storing VIPs at elevated temperatures with and without humidity.Increase of thermal conductivity,water intake and gas pressure is measured during storage.For evaluation of the results data on the relation between thermal conductivity and gas pressure,the influence of water content on thermal conductivity (for silica),the adsorption isotherm of core material (silica) or dryer and getter capacities have to be known.As usually only small variations of thermal conductivity can be detected,a detailed evaluation of the measurement methods and their potential accuracy is necessary.The paper reports on results of measurements on various barrier films and core materials.Advantages and disadvantages of different methods including fast measurement procedures are discussed.
vacuum insulation panels accelerated aging air permeation vapor permeation service life time
Roland Caps Ines Wallaschek Ismail Abu-Shawriyeh Samuel Brunner
va-Q-tec AG, Karl-Ferdinand-Braun-Str.7, 97080 Würzburg, Germany EMPA, Ueberlandstr.129, CH-8610 Duebendorf, Switzerland
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
257-260
2015-09-01（万方平台首次上网日期，不代表论文的发表时间）