Is there a way to solve the problem of condensation on the outside of windows?
user-6809777|Posted in一般的问题on
你好呀，
We have just built an almost passive house on Canada’s west coast. Our windows are triple-paned and passive house certified. Because they are so well insulated, on many clear, cold days in the late fall, winter, early spring, condensation will form on theoutsideof the windows.
很多人都建议我们很幸运，因为这意味着窗户正在做出很大的工作绝缘。但是，我们很乐意在那些清澈的冬季早晨看到我们的观点。
有没有人有类似的问题并且有任何解决方案为他们工作？
Thank you!
Beth C.
Replies
Toquote Martin: "The phenomenon you observe is the same phenomenon that causes dew or frost to form on blades of grass or your car windshield.
“室外空气含有水分。在清澈，寒冷的夜晚的末端，一些表面的温度下降到露点下方 - 这些表面足以使冷凝或霜变冷以形成。在那一点，户外的水分在冷表面上空气冷凝（或沉积为霜）。
"Surfaces exposed to the sky (not protected by tree cover or cloud cover), especially horizontal surfaces, are usually the first to get cold enough for this to happen, due to the phenomenon called nighttime radiative cooling. Here's what happens: the car windshield or blades of grass radiate their heat to space. Nothing stops this radiation on a clear night, so the car windshield or blades of grass can get colder than the outdoor air temperature.
"When this phenomenon occurs on a vertical surface, as apparently happens on your triple-glazed windows, it's usually a safe bet to declare that your windows have a good view of the sky. This typically happens when a house is on a slope or on the top of a hill, and the windows face the downhill view, without intervening trees.
“这种现象更有可能发生在三层玻璃窗上，而不是单玻璃窗，因为通过窗户的热量泄漏，单釉窗口保持在露水点上方。（窗格温暖，整晚都长，只要当房子被加热时。）用三层玻璃窗，最内层窗格很温暖，而最外面的窗格很冷。“
那么，阻止他们对天空的看法？换更糟糕的窗户？聘请邻居孩子用抹布待机？在外面吹风机？对不起，没有一个有用的建议，但至少现在你知道为什么！也许别人以前遇到过这个并解决了......
There are anti fog films for boat windows. Don't know how well they work, but have seen them at the marine stores.
贝丝，
Yupster引用了我在Q＆A线上发布的答案（"Frost on outside of triple-pane window"）。
有关此主题的更多信息，请参阅本文：“夜空辐射。”
在那篇文章中，我写道，“夜空辐射也解释了为什么三层玻璃窗有时会在窗户外面得到冷凝或霜冻。在一个晴朗的夜晚之后的某些早晨会发生这种情况。在窗户上，在窗户上面向下坡的现象是最常见的家庭栖息在陡峭的山丘上：这些是最有可能“看到”天空“的窗户。”
Hi there! Thank you for your quick reply. You pretty much exactly described how our house is situated and where the windows are located. I like your suggestion of hiring a neighbourhood kid with a rag on standby! We are wondering if some kind of coating might repel the condensation somewhat. Or perhaps some sort of drip irrigation system, although maybe that's not worth the effort. I only now thought to ask the Green Builder community because of Martin's most recent article on condensation on swim masks/mirrors.
贝丝，
我非常靠近温哥华岛南部。我很高兴送你一个邻居的孩子，并将抛出抹布和免费送货。他的名字是丹尼尔，我不希望他回来。
一个临时解决方案是尝试一种像雨-X这样的防水挡风玻璃处理。它不会阻止发生凝结，但累积的水将珠子更快地摆脱窗口，提高可见性。我没有个人尝试过这个，所以我不知道它有效。您可能需要每年重新申请。
Insulated exterior shutters are a more permanent solution, but are costly and inconvenient. If night sky radiation is the problem, as Martin suggests, then ordinary shutters, or other outdoor shades, might work.
我要建议尝试rain-x。Rain-X用薄膜涂抹玻璃，膜允许水滴放开更容易滑动（在汽车上使用时，它真的很酷）。它会帮助冷凝也耗尽，但构成冷凝的非常小的液滴可能不会像雨滴一样戏剧性地滑落。
如果您真的想快速清洁它，您可以使用一些迷你喷水喷雾器“软管向下”窗户。轨道使一些便宜的（类似于雨滴，但更便宜）。洒水器与Rain-X相结合将是清除窗户的快速方法。
账单
是的，我们在想雨-x。谢谢，条例草案，轨道的推荐作为喷水灭火系统的来源。我们可能会尝试。
谢谢所有人的所有速度和乐于助人的回复！
干杯，
Beth C..
Windows awnings would block much of the sky view.