[Greenbuilding] South-facing windows are net energy gains...

[John Straube]

I have friends who worked on this.  The houses are all R2000.  It would have been more economical to insulate better.. and just using the central tank, no ground loop, would generate most of the savings with far less cost.
The overall system is very expensive.
Check under publications for the newsletters

On 2011-01-12, at 12:00 PM, Sacie Lambertson wrote:

> John, What an interesting site and concept.  The 'current system condition' bulb is worth a click.  Wish there were actual photos of the houses, not just those taken from the air. Any idea what the minimum houses it takes to make this joint solar savings and distribution system work?  Cost per sq foot? Must be high or more people would take on such an impressive project.   Saw no newsletter but the diagrams and explanations are good.  Are home owner's comments available?  Sacie
> 
> On Wed, Jan 12, 2011 at 10:28 AM, John Straube <jfstraube at gmail.com> wrote:
> 
> The highest solar savings fraction that has been documented is now a sola seasonal storage system in Alberta and it is drifting toward 90%
> Rather expensive, works only at scale, but neat to see for me.
> See www.dlsc.ca and look at the most recent newsletter, or just browse.
> All other documented buildings, including highly insulated ones with solar air heating, are much less. Direct Gain systems through windows do about as well as trombe walls, solar heaters, roofs etc.
> Norm Saunders probably got some of his homes to 90%+ (100% if you were willing to freeze) but this was never documented.
> 
> John 
> 
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Dr John Straube, P.Eng.
Associate Professor
University of Waterloo
Dept of Civil Eng. & School of Architecture
www.buildingscience.com

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