Secondarily, should the fan be outside or inside the window?
Asking for a friend. (Me, help. I can’t remember physics, it’s too goddamn hot)
Edit: I’ve opened all the windows and set up a fan a short distance from the window pointing out and it’s reduced the temperature to near-tolerable levels. Unfortunately, venting through the attic was a no-go but moving things aside might make it an option next time. Thank you all, I appreciate the help!
I’ve tried it many ways. The most efficient method using a fan is to open the windows in a room on the leeward side of the house, then place a fan a few feet in front of the doorway, blowing air into the room. It’s more efficient because the impelled air will entrain surrounding air moving a greater volume through the doorway and out all the windows in that room. Then open windows in the farthest rooms to get a cross breeze.
Also look into an attic fan. They exhaust hot air from the attic, and it makes a world of difference in keeping your interior cool. Another trick is to mount shade cloth 6 inches away from the sunny walls of your home. It absorbs most of the solar radiation and keeps your walls cooler.
- reversible fan
- blow hot air out during the day
- bring cool air in a night (night flushing)
Any box fan is reversible if you turn it around.
- reversible fan
https://www.youtube.com/watch?v=1L2ef1CP-yw This is the best way to get what you want.
This guy seems to have a different goal then OP. He just wants the max airspeed in other parts of the house
The goal is the same.
Scenario: cold air outside, hot air inside.
Goal: replace hot air inside with cold air outside.
Method: open one intake window and one exhaust window. Use a fan to blow hot air out the exhaust window while the low pressure vacuumed created inside will cause cold air to be sucked in through the intake window.
Maximize efficiency of method: follow video posted.
Well, the folks over at noctua have fan shenanigans down to a fine science, and since I have generally forgotten the last rabbit hole I went down, I’d say get two fans and have one blowing in and the other out, lol.
This is the wrong application, noctua are looking for static pressure, what OP wants is to maximise airflow. Mathias wandel has some pertinent videos on the subject, the ideal is a large fan about a metre or two away from the window, depending on the size of the fan, blowing hot air outside.
Why so far from the window?
I think you get the benefit of the airflow pulling in air along its edge to push out with it.
Like pushing a bunch of water with a broom removes not only the water in front of the broom but also more water due to surface tension and inertia
It’s called the venturi effect.
It’s called the butterfly effect.
Oh yeah the bruscietta effect
It’s called the kimchi effect
The most efficient way is to force cold air into the space while also forcing hot air out. The best way to do this is to have maximum airflow from one end of the house to the other, often by opening all of your windows and using multiple fans to direct the air. For example, an intake fan pulling air in at the north end and an exhaust fan pushing it out at the south end.
