A model for freeze–thaw cycling of the South Pole Station exterior sheathing
- 作者：Gary Phetteplace ; Jason Weale
- 关键词：Antarctica ; South Pole ; Solar flux ; Heat transfer ; Freeze– ; thaw cycling ; Moisture accumulation
- 刊名：Cold Regions Science and Technology
- 出版年：2008
- 期刊代码：14_0165232x
- 类别：ear
- 出版时间：April 2008
- 卷：52
- 期：2
- 页码：254-261
- 文件大小：364 K
摘要
An infrared survey [Phetteplace, G. 2006. An Infrared Survey of the South Pole Station Modernization Project, Final Project Report to National Science Foundation, US Army Cold Regions Research and Engineering Laboratory, Hanover, NH.] of the new South Pole Elevated Station revealed evidence of excessive air exfiltration in some locations. Despite the relatively low indoor humidity normal in the South Pole Station, typically less than 10%relative humidity (RH), there was concern that excessive exfiltration could result in moisture accumulation within the building walls. While the accumulation and freezing of moisture at any point in the wall section could be problematic, what was felt to be of greater concern was the potential for repeated freeze–thaw cycling near the exterior oriented strand board (OSB) sheathing due to the significant diurnal temperature cycling of the siding during the Antarctic summers. The intense solar radiation conditions on vertical surfaces at the low Antarctic summer sun angles results in very high solar fluxes, and surface temperatures can rise well above freezing even in ambient temperatures that are − 20 °C or lower.