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I hemmed these curtains today (lemmy.dbzer0.com)
submitted 23 hours ago by to c/dull_mens_club@lemmy.world
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Now they're the perfect length.

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[–] 0 points 20 hours ago* (last edited 17 hours ago) (6 children)

Condensation forms when the temp on the inside surface of the pane drops below the dew point of the air inside. Doesn't need to be -40c outside and thats not even a sufficient condition on its own.

Condensation can form anywhere, on the walls, floor, doors, etc... Just need the indoor surface temp to drop below the indoor dew point. Doesn't have anything to do with air flow.

Heat is placed below the window to keep its surface temp above dew point.

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  • [–] 3 points 17 hours ago* (last edited 17 hours ago) (3 children)

    Your entire comment ignores how humidity plays a role, which is rampant in houses when you bring snow in from outside, or as soon as you open up any door to go in or out, the air rushes inside causing a moisture spike for up to hours at a time.

    It’s not JUST temp. You can have condensation at 20c with a high RH, or you won’t have any if you can manage to keep the RH at a manageable level and prevent pockets. Which is another reason why airflow is important, there’s multiple like mold prevention, dust, mildew, pollen, hair, dander, etc. you NEED airflow. And that’s done by utilizing the physics of the difference between hot and cold and the drafts it creates. Especially when you don’t have forced air central conditioning/heating.

    Airflow is the only thing that mitigates it. If you have a glass of water, it can have condensation on it, but place it a flow of air (like a fan) it will evaporate and leave the glass feeling dry. Thats how you prevent/remove condensation. Heating the room, only changes the RH so much.

    You must live in a fair weather place and have never experienced cold weather have you?

    Will research even change your mind? there’s hundreds of studies that have been done about how crucial airflow is to basic air condition. This study even pulls research from 1965, so it isn’t like this is something new either….

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  • [–] 2 points 8 hours ago* (last edited 2 hours ago) (2 children)

    Humidity is a piece of defining the dew point. They're two sides of the same coin

    For research, I have ms in mechanical engineering focused on building energy systems and have worked in commercial construction for years.

    Ive lived in Canada and Chicago.

    Indoor dew point and indoor surface temperature are all thats required. Air flow can vaporize condensate, but wont prevent its formation.

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  • [–] 1 point 8 hours ago* (last edited 8 hours ago) (1 child)

    This radiator was not placed to heat the room.

    Yeah bullshit, anyone with a basic understanding of “building energy systems” would understand that radiators are placed underneath windows to heat/condition and provide airflow to (see link in previous comment for why this is so important) a room. It’s thermodynamics.

    Without airflow, a couch against a wall, or curtains and blinds on a window, creates a pocket. Where if the room was properly conditioned, it could still have condensation and mold since there’s no airflow to mix the air.

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