Trombe Wall - Building Systems Mock Exam - Architect Registration Exam - ARE Live

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• published: 29 Dec 2015
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To view the related course, click here: http://bksp.es/yt-building-systems-11-11-15 15% Discount on a Black Spectacles Membership for AIA Members: http://bksp.es/systems-code Download the Mock Exam- http://bksp.es/building-systems-mock-exam-11-11-15 AIA ARE Prep powered by Black Spectacles- blackspectacles.com/courses Mike's Recommended Resources to pass the ARE: http://blackspectacles.com/blog/books-need-to-pass-are-exam-resources Mike: Okay. Number ten, this is an oddball, but it's here to represent a series of potential questions you might get, "A trombe wall..." people will say it a couple of different ways. But I believe it's supposed to be trombe wall "...is an example of a high R-value assembly. Is it a passive heating system? Is it a system of gathering electrical energy from an occupant's activities? Is it a natural air filter?" And the answer is a trombe wall is a passive heating system. So trombe walls, just to put an image to it. If you imagine you have a room. You have people in the room, and right here, I have a big, thick element that is a material that is a very good heatsink. So it's a heatsink, like let's say concrete or something like that. So it can absorb a really massive amount of heat, and then right here, I have a window right in front of that great, big heatsink, and I have this airgap in between. So there's a little space in between. It might be 4-inches. It might be 6-inches. It might be 12-inches. In some certain situations it gets bigger than that. What happens is I get that solar radiation through the glass. It warms up that concrete. So the concrete gets nice and toasty warm, but because it's such a big heatsink, it takes a very long time, and eventually after many hours that heat penetrates through that big heatsink, and starts radiating out into this space. So the idea here is I can use this great, big heatsink, as a way when I have sun, I don't want it during the day. Things are already hot during the day because of the sun, but then at night when it gets nice and cool, now I need to actually heat the space. Well, I can do it because this heatsink, this big wall, this trombe wall has absorbed heat through the entire day and now it's many hours later. It's nighttime. It's going to give off that heat into the space during the evening. Then after the evening is over it's been giving off heat all night. Eventually it's given off all of its heat and what happens? Well, the sun rises the next day and it gets warmed up again. So it's this simple system of delaying the solar gain until you want it. You have this huge amount of solar gain during the day and you delay until when you need it at night using this big heatsink of the wall, the trombe wall. So a couple of quick things to say about that. For one, it's not going to work everywhere. It really is a perfect thing in certain kinds of climates, where you have a reasonably hot sun during the day and a reasonably cold nighttime. So the southwest or something would be a great example, but it would work in other places. The other thing you can start to do is you can start messing with it a little bit. So you could have a vent opening down at the bottom, and a vent opening up at the top, and then maybe a vent opening in the window at the top, and a vent opening in the window at the bottom. So with some careful consideration, you could imagine. Let's say you really want to get some heat during the day because it's very cold out. There's cold air that's down at the floor level, it's going to find its way into that space. The sun will warm it up. It's going to warm up, and it'll eventually come out the top because warm air will rise and it's going to move through this space, eventually getting cool. Because moving through the space where it gets cool once again, back into the system, you can get a convective current going, just by the sheer fact that there's warm sun in this space. If you don't want it, you just close the vents and the air stops moving and there you go. Well, what if it's during the summer and we have too much heat coming in and we don't want it? Well, I can open these two guys. I can let air in from outside and it's going to come in. It's going to warm up which, it's already hot, but it's going to warm up even more. Therefore it's going to rise, and it's going to want to get out. So now it rises up and out, and I'm effectively cooling down my heatsink by constantly bringing in fresh air to pick up some of that heat, and then move it on out. I can then take fresh air from outside, warm it up, and bring it inside. I could take cool air from the floor. Let it warm up and create a constant flow of new air, especially if I bring in some outside air from the other side. So this one weird, little system because of the nature of heat rising, the sun is always going to heat that air and that wall up, it can heat and provide convective currents which feel like cooling, and a whole series of different things.