2的评论

1. 
   内特·里克（Nate Reik）|Apr 12, 2022 09:33am|＃1

   Interesting discussion! I'm in the process of building a part-time use cabin as well... I'm monitoring interior and exterior Temps, RH and dewpoint, but starting to look more at when one should start to get concerned.....

   “如果有电力在现场可用，那么这个问题的答案是在冬季提供空气变化（也许不是浴室风扇），以保持这种“乒乓球”的水分。如果您想进一步迈出一步，请考虑一下about a dehumidifier, or a humidity-controlled fan, or monitor the humidity levels to see if you’re running up against the edge of risk. A more expensive option is to keep some minimal heating on during unoccupied periods—same indoor and outdoor dew point, but interior RH will be lower."

   我认为这依赖于通风时的外部露点低于内部露点，那么，正确吗？而且，对于凉爽的建筑物，“风险边缘”是什么？您可以在冰箱中生长霉菌。

   -Nate

1. 专家成员
   Peter Engle|2022年4月12日上午11:06|＃2

   Ideally, you would ventilate whenever the exterior dewpoint was lower than the interior dewpoint by some margin, maybe 5-10 degrees. That would require some sensors and a custom control system, but not too tough to DIY for a tinkerer. If there are solar panels on the off-grid cabin, there would be enough power to run a fan at least, even in cloudy weather.

   “风险边缘”的内部RH约为80％。“某个地方”可能是+/- 10％或更多。就像在许多建筑科学中一样，这取决于。Joe L.和其他人已经从事“水活动”工作 - 也就是说，木细胞表面的游离水分子的可用性。我并没有遵循很多实际的研究条件是理想的。但这是表面温度开始变得非常重要的地方。如果木材表面比空气凉爽，那即使是中等室内RH也会导致高表面RH和由于凝结或接近敏感而导致的高水活性。

   虽然模具确实在冰箱中生长，但它们会慢慢地生长，并且大多数模具不是木制模具。它们在更高的能源底物（食物）上生长，这使它们在寒冷中少一点。文献已经解决了（我认为），木材破坏霉菌和真菌的生长并不高于50f。

   So in broad terms, the edge of risk in an unoccupied building is probably as high as 90% when the temperature is well below 50F continuously. But those conditions result in saturated wood that is just waiting to bloom with mold when the temperature rises. There are some dehumidifiers that will operate down to about 50F. Running one of these at about a 60%-70% setting whenever the temperature exceeds 50F in an unoccupied cabin would help quite a bit, though it would cost something to run. But even a small ventilation fan as Kohta mentions would help.