A model for freeze–thaw cycling of the South Pole Station exterior sheathing

摘要: An infrared survey [Phetteplace, G. 2006. 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.] new Elevated revealed evidence excessive air exfiltration in some locations. Despite relatively low indoor humidity normal Station, typically less than 10% relative (RH), there was concern that could result moisture accumulation within building walls. While freezing at any point wall section be problematic, what felt greater potential for repeated freeze-thaw cycling near exterior oriented strand board (OSB) sheathing due significant diurnal temperature siding during Antarctic summers. The intense solar radiation conditions on vertical surfaces summer sun angles results very high fluxes, surface temperatures can rise well above even ambient are -20 °C or lower. Typical energy analysis methods not suited this problem a variety reasons. Thus we constructed finite difference heat transfer model with full compliment realistic boundary application. base case planned various retrofits were evaluated using actual weather data six seasons. show under worse season would see approximately 44 cycles. That number reduced only 12 addition either 25 mm extruded polystyrene foam insulation, 19 plywood 13 same insulation. Over year period these additions reduce cycles by over factor six.