Posted by Bret4207 on March 06, 2014 at 09:39:23 from (64.19.90.196):
In Reply to: Solar heating? posted by 55 50 Ron on March 05, 2014 at 09:58:58:
Tom, I was looking at examples like this- http://www.norishouse.com/PAHS/UmbrellaHouse.html
Now, looking at that what I see is an insulated (R20) ground mass, only insulated on top and a little of the sides. What I also see is that the thermal energy is theoretically somehow transferred to the ground mass via warm air convection through the labeled "heat tubes". (This is why I compared to a heat pump type system, I understand you're using natural convection- got it, no argument on the passive part.) The impression I get is that they are, in t e example I linked to anyway, somehow taking that warm air 50 feet down and attempting to warm the soil. And all this is being done through a relatively tiny window of the house.
Where I have a real problem is that if this was to work, then you are putting X BTU's (for lack of a better term) into the ground via natural convection during the day. As soon as the sun goes down or it clouds up significantly then the convection current is going to change and the BTU's start going the other way as cool air starts flowing in and cooling the mass. So I guess my question is, how can it "gain" heat once your losing more BTUs than you're gaining? I can let a rock get nice and hit in the sun and cover it with insulation, by midnight or so it's still going to have lost that heat. Unless the whole of the ground mass was insulated it's going to radiate out.
Please tell me more. I won't say it can't work, but I have a real hard time envisioning it.
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