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An improved solar attic - Page 4

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Posted by Logan Shaw on December 20, 2005, 7:52 am
Jeff Thies wrote:

I'm not following you, but it's no big whoop either way.  From where
I stand, it seems like Bev responded to someone named "tom" who wrote
a message whose body was just this one line:

    Good thinking!  Tom

And, unless Usenet has mangled the posting badly, he was not starting
a new thread, because his posting has a References: line.  And Bev
was replying to him.

But, I don't see much point in pressing the issue, since Usenet is
fairly chaotic sometimes, and not everybody always sees the same set
of articles in the same order.  Sometimes articles never even make
it to certain sites, etc., etc.


   - Logan

Posted by The Real Bev on December 23, 2005, 12:19 am
Logan Shaw wrote:

Me too.  Not many of us left.  I think I'm going to bail...

Cheers, Bev
My house isn't a pigsty, it's an Immunity Enhancement Center.

Posted by Jeff Thies on December 23, 2005, 3:28 am
 The Real Bev wrote:

   I dialed it in to take a look. Looks like a lot of traffic, but also
a lot of petty personality conflicts. When you have to start killfiling
it's time for another group... Shame, looks it has potential...


Posted by The Real Bev on December 23, 2005, 4:24 am
 Jeff Thies wrote:

There are real advantages to setting up your newsreader to show headers for
ALL unread messages.  Then you can tell whether a given thread has
deteriorated to the 'I know you are but what am I" level of discourse and mark
the whole thing as read.  I save my killfiles for only the most egregious
loons, none of which post here (mcfl).

Cheers, Bev
"I'm sorry I ever invented the Electoral College."
                                 Al Gore 11/08/00

Posted by nicksanspam on December 23, 2005, 11:26 am

We might discuss the economic and technical aspects, vs "You must be crazy
to think that will work," "Your computer can't even make Pi," "Your attic
can't work, because you haven't installed enough heat pumps," and so on.

Dynaglas polycarbonate costs $/ft^2. Installing a 4'x12' panel takes 10
minutes. It lasts 20 years but might go longer with a sloped reflective
overhang for less summer sun and more winter sun. Shingles cost about
$.30/ft^2, plus $.10 for felt plus $.50 for OSB? So materials are
a wash, but there's a large labor savings. How much? The solar heat is
worth about $/ft^2 per year.

How much heat will a dark absorber lose to cold glazing by radiation?
How can we make a dark mesh that will work with a 1-10 meter per hour
face velocity? Black aluminum window screen costs about 25 cents/ft^2
in 4' rolls, but its pneumatic resistance is likely too low. Typar is
cheap, about 10 cent/ft^2 IIRC, but its pneumatic resistance is high.
How about poking some holes in Typar? How many? How big?
Would a geotextile material work better?

http://www.reemay.com  Typar comes in wide rolls, eg 9'x111.1'. It's porous,
0.0032L/s-m^2 at 75 Pa, ie 0.00063 cfm/ft^2 at 0.3" H20, eg 0.2 cfm for
an 8'x40' wall, and charcoal on one side. It lasted 5 years on a south wall
of my house, exposed to the weather, but it has a lifetime guarantee :-)


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