Posted by VaTom on March 06, 2014 at 19:55:11 from (70.32.203.33):
In Reply to: Re: Solar heating? posted by George Marsh on March 06, 2014 at 18:49:17:
George, you know that mass works. In Arizona adobe was common for low elevation. It relied on diurnal temperature variations to stay comfortable. Too many cold days and it was real uncomfortable. Then the mass was working against you. Summers, like yours, with high diurnal swings worked well.
Hait's basic plan called for a dirt mass 20 feet beyond the house perimeter with the walls mostly buried. Two feet of overhead, under-umbrella dirt. The 20 feet is what Hait measured heat to move in his Missoula fill in 6 months. The mass under the house is part of the house also, down that same 20 feet.
Fills, and substrate vary. I account for that, but it's rarely critical.
The small PAHS ΔT between mass and indoor temp means a large area of surface contact is necessary for adequate heat movement. The first time I modeled a house with a standard basement (most of these resemble a walkout basement with no house on top) I was surprised at how well a basement functioned. Shouldn't have been surprised, but I was.
In France, the current movement is to use curvilinear thinshell concrete combined with PAHS. There's a venerated tradition of thinshell concrete Maison Bulles, bubble houses. Unbelievably uncomfortable winter and summer. PAHS solves that.
Two years ago a young Frenchman I helped with PAHS for his thinshell concrete in the shape of a nautilus talked me into a 9 day road trip to visit these famous houses. He knew everybody. Take a peek at one of the most famous.
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