Convective loop vs. Ventilation vs. Stack Effect



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    Ariel Jamison

    Hey Christopher, I'm also just studying for PPD so take what I say with the knowledge that I'm also learning.
    Convective loop systems (thermosiphons) according to Ballast materials are solar collectors below the heated area. The air heated rises and is replaced by cooler air as the warmer air rises and the cooler air falls. I imagine a heated bathroom floor with radiant water system, but I'm not sure if that is 100% on point. I also think of cold places where you want the heat close to you but no open windows to let the heat out.
    Ventilation is easy, it's essentially any space air/wind can blow through without any heat exchange. Two windows open at opposite ends of a room or a lot of Grecian buildings exemplify this. Hot humid places want this most out of any areas.
    Stack affect is when a breeze/air circulation is created by heat rising out of a space through a tall "stack" and so cooler air is drawn into the building through a lower opening. Typically wind at the top of the stack is used advantageously to help create negative pressure and increase the amount of air pulled through the space. Ballast uses the example of the pantheon, but I grew up in the southwest so I think of the Sonoran Desert. Arab areas also use this technique frequently. Hot and arid regions for this.

    Hope that helps! Good luck, and wish me luck, my test is in 4 days! Yikes!

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    Christopher Rawlins

    Thanks for the reply Ariel. Best of luck on your exam. I test tomorrow so we’ll see how it goes. 

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