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Forum: Solar Heating

02-26-14, 09:38 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

I suppose it might seem weird to add solar PV to...

I suppose it might seem weird to add solar PV to a house with a good solar thermal system. Presumably the net metered PV would supply a good ASHP system but unfortunately I got educated late about...

Forum: Solar Heating

02-26-14, 09:03 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

Update

Hi Daox, I saw your question just now. Better late than never and it's a good excuse for an update. No, I'm not using it this season because there's no insulation in the house yet and all that heat...

Forum: Solar Heating

12-09-13, 11:52 AM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

I'm glad you are able to read between the lines...

I'm glad you are able to read between the lines on where 99.9 % of my future work lies.

Best,
E

Forum: Solar Heating

12-08-13, 07:34 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

Phase 2: Successful implementation

Phase 2 of this project is quite a ways off in time so don't expect many updates here until later. Phase 2 will require that I am actually able to bring that high temperature air down from the roof...

Forum: Solar Heating

12-08-13, 07:20 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

Phase 1: Still just an experiment

It's easy for me to forget that this is still just an experiment. It's a risky venture in that if it doesn't succeed then it will be a lot of work for nothing. The only thing that makes me OK with...

Forum: Solar Heating

12-06-13, 08:54 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

It's not really authorized by code to have...

It's not really authorized by code to have combined attic spaces of homes with attached garages because of the danger of automobile fumes reaching the living space. If I decide I need the combined...

Forum: Solar Heating

12-06-13, 05:37 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

In the interest of full disclosure

I probably ought to disclose that I have a significant area of roof for roof heating that is not used as habitable space. This is always an advantage for collecting the rays. I built a large 'L'...

Forum: Solar Heating

11-27-13, 08:21 AM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

That's really good to hear. There's not going to...

That's really good to hear. There's not going to be windows or thermal mass used to acquire heat. I'm just using the roof to supply heat. It's beginning to feel like I can quit obsessing about the...

Forum: Solar Heating

11-26-13, 11:02 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

I don't know what I was thinking when I said a...

I don't know what I was thinking when I said a few comments back that the attic and outside temps converged between 7 and 8 PM. They don't. The attic and "unconditioned space temps" converge at that...

Forum: Solar Heating

11-26-13, 07:53 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

Here's the plan

I've been thinking about how this is all going to work without heat storage. Despite our reputation here it gets cold at night and the unconditioned uninsulated part of the house has already gotten...

Forum: Solar Heating

11-23-13, 07:00 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

It seems the world is never quite as simple as...

It seems the world is never quite as simple as one anticipates. It's almost like the more I assume something without actually having prior experience the more likely I am to be wrong. You might be...

Forum: Solar Heating

11-20-13, 06:41 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

Thanks Daox. It rained all yesterday and the temp...

Thanks Daox. It rained all yesterday and the temp rise got to an amazing 4 degrees in the attic! Nothing like rain to keep down the roof temps. Today it was totally overcast and threatening until...

Forum: Solar Heating

11-17-13, 09:21 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

Here's some pictures of the insulation...

Here's some pictures of the insulation installation. The ductboards are 2' x 4' in dimension and reflective on the side opposite being seen. They are equivalent of about R-8 (2 inches of fiberglass...

Forum: Solar Heating

11-17-13, 08:05 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

Thanks Iamgeo. Even with the limited amount of...

Thanks Iamgeo. Even with the limited amount of success I've had here I'm still not convinced that an attic solar system will do well in all climates represented on this forum. I think it will...

Forum: Solar Heating

11-17-13, 12:31 AM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

So the obvious answer to what I just said is add...

So the obvious answer to what I just said is add more insulation at those heat stress points. That's what I did and I used duct board rather than foam board, mostly because it was my preference, even...

Forum: Solar Heating

11-17-13, 12:14 AM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

Getting back to the problem... attic solar heat...

Getting back to the problem... attic solar heat has a quality problem, not a quantity problem. That is, there is a huge quantity of roof surface space that the sun radiates onto. There is a lot of...

Forum: Solar Heating

11-15-13, 10:49 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

Well, its seems I was looking through rose...

Well, its seems I was looking through rose colored glasses when I estimated that the temp rise in summer of 40-45 degrees would continue into winter. My reasoning was that the lower inclination of...

Forum: Solar Heating

09-24-13, 03:30 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

Update on the bath fan CFM requirements... After...

Update on the bath fan CFM requirements... After googling I found this:

"First, determine the height of the building (H) above grade. Second, arbitrarily select a neutral pressure plane height...

Forum: Solar Heating

09-21-13, 07:31 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

Hi Daox, I may have sounded more confident than...

Hi Daox,
I may have sounded more confident than I was about the adequacy of a bath fan to bring down the air. What I've been thinking about recently is using a 130 cfm Panasonic fan in full ON mode...

Forum: Solar Heating

09-05-13, 02:24 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

I was waiting for someone to ask that question!

Daox, it seems appropriate that the first smart cookie to ask it was you. I have thought long and hard about that and have decided the best fan is no fan. I built the ducting to the living space with...

Forum: Solar Heating

09-05-13, 11:47 AM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

I really don't think moisture is going to be a...

I really don't think moisture is going to be a problem. For one thing, the radiant barriers come in two forms, perforated and unperforated. I'm using the perforated kind and that's what you should...

Forum: Solar Heating

09-04-13, 01:35 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

Daox, thanks for the kind words. I've been...

Daox, thanks for the kind words. I've been wondering how your remote located solar panel project is going. Any updates? I've been busy so I may not have kept up.

Forum: Solar Heating

09-03-13, 08:49 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

A bit about the building philosophy behind this....

A bit about the building philosophy behind this. From everything I've been reading most people install roof heating systems using the air to either heat some kind of reservoir, usually a crawlspace,...

Forum: Solar Heating

09-03-13, 03:25 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

Here are some pictures, hopefully in the sequence...

Here are some pictures, hopefully in the sequence of construction, so you can get an idea of what's going on. This first picture is of the interior roof that I painted flat black. It shows the 8"...

Forum: Solar Heating

09-03-13, 02:20 PM

Replies: 36

Attic heat project designed from the bottom up

Views: 39,272

Posted By Exeric

Attic heat project designed from the bottom up

I have been working on the attic air heating idea and have done most, but not all, of the construction on it. This is an offshoot from the Using Attic Heat for the House thread:...

Showing results 1 to 25 of 25

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