Investigation of gas permeation through Al-metallized film for vacuum insulation panels

Jung, Haeyong; Jang, Choong Hyo; Yeo, In‐Seok; Song, Tao

doi:10.1016/j.ijheatmasstransfer.2012.09.013

Cited by 16 publications

(2 citation statements)

References 20 publications

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“…Therefore, core materials pre-treating proceeding for the manufacturing VIPs is important for the vacuum maintaining through the service life. The barrier membrane and the numerical model in this paper, the service life of VIPs can be deduced for further research work (Kim et al 2012;Schwab et al 2005a;Schwab et al 2005b;Jung et al 2013;Tenpierik & Cauberg 2007).…”

Section: Resultsmentioning

confidence: 99%

A simple and effective model for prediction of effective thermal conductivity of vacuum insulation panels

Kan

Kang

Wang

et al. 2015

Future Cities and Environment

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The excellent thermal insulation performance of vacuum insulation panels (VIPs) make them widely applied in energy conservation fields, especially in buildings engineering. This research work proposes a simple, yet extremely effective, alternative model for prediction of the effective thermal conductivity (ETC.) of VIPs. The ETC. of VIPs is function of the thermal conductivity of the core materials, the equivalent thermal conductivity of the rarefied gas embraced in the core and the equivalent thermal conductivity of radiation in the early studies. The micro structure of the porous core materials and vacuum degree are taken into consideration and the prediction numerical model for the ECT of VIPs is developed. The relationship of the vacuum degree versus the ETC. is theoretical analyzed. Three types VIPs are made from the polyurethane foam materials, superfine fibrous materials and nano-granular silica materials as the core materials. For each type, the vacuum degree and the thermal conductivity are collected, including the comparison between the testing results and the prediction model. The agreement between the model and the experimental results is fairly well when the air pressure is very low. The vacuum maintaining and service life of the VIPs are also discussed. The research work is meaningful for the enhancement of stability and the development of vacuum insulation panels.

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Section: Resultsmentioning

confidence: 99%

A simple and effective model for prediction of effective thermal conductivity of vacuum insulation panels

Kan

Kang

Wang

et al. 2015

Future Cities and Environment

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“…The envelope typically has a multi-layer structure consisting of a thin polymer film and aluminum foil. A polymer film is suitable for high-temperature bonding, and an aluminum foil or metallized thin film helps protect the inside of the VIP from atmospheric gases in a sealed envelope [5,6].…”

Section: Introductionmentioning

confidence: 99%

Development of Accelerated Test Method to Evaluate the Long-Term Thermal Performance of Fumed-Silica Vacuum Insulation Panels Using Accelerated Conditions

Bae,

Kim,

Kang

2023

Materials

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International standards for vacuum insulation panels (VIPs) include an accelerated test method and a minimum quality standard for evaluating their long-term thermal performance after 25 years. The accelerated test method consists of various tests according to the characteristics of the core material and requires six months (180 days) at minimum. Herein, we propose an accelerated method for determining the long-term thermal performance of fumed-silica VIPs by shortening the required time and simplifying the procedure. Highly accelerated conditions (80 °C and 70% Relative humidity (RH)) were set for the evaluation method, using the maximum temperature (80 °C) cited in international standards and compared with the accelerated test method under accelerated conditions (50 °C and 70% RH). The inner-pressure increase rate of the VIP samples after conditioning for approximately 70 days was similar to that after conditioning for 180 days under highly accelerated and accelerated conditions, respectively. In addition, the estimated long-term thermal conductivities of the fumed-silica VIP were derived as 0.0076 and 0.0054 W/m·K under highly accelerated and accelerated conditions, respectively. These accelerated methods can be used to produce fumed-silica VIPs with similar long-term thermal conductivities. Therefore, the accelerated test method for long-term thermal performance using the highly accelerated conditions can be evaluated using a test that involves conditioning the sample for approximately 70 days under 80 °C and 70% RH.

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Effect of nano vacuum insulation panel and nanogel glazing on the energy performance of office building

2016

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Investigation of gas permeation through Al-metallized film for vacuum insulation panels

Cited by 16 publications

References 20 publications

A simple and effective model for prediction of effective thermal conductivity of vacuum insulation panels

A simple and effective model for prediction of effective thermal conductivity of vacuum insulation panels

Development of Accelerated Test Method to Evaluate the Long-Term Thermal Performance of Fumed-Silica Vacuum Insulation Panels Using Accelerated Conditions

Effect of nano vacuum insulation panel and nanogel glazing on the energy performance of office building

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