Steve,
I would consider utilizing a small geothermal system to "up the heat". You have some good
geothermal heat pump companies in Maine.
While rock-bin storage works, so can hybrid approsches with trombe walls
https://www.nrel.gov/docs/legosti/fy98/22834.pdfStay warm ! - Scott
Scott Sklar
President
The Stella Group, Ltd.
706 North Ivy Street, Arlington, VA 22201
VA Phone: 703-522-1195 (3049 direct)
E-mail: solarsklar@aol.com
Website: www.TheStellaGroupLtd.com
The Stella Group, Ltd.. is a global strategic technology optimization owner's rep firm for
clean energy users and companies, with a focus on system standardization,
modularity and web-enabled diagnostics. Scott Sklar is an Adjunct Professor at
The George Washington University teaching three unique interdisciplinary
sustainable energy courses, and an Affiliated Professor with CATIE, an
international graduate university in Costa Rica offering graduate degrees
on sustainability. Sklar is the Sustainable Energy Director at GWU's Environment
and Energy Management Institute (EEMI).
------------------------------
Scott Sklar
President & Adj Professor
The Stella Group, Ltd, GWU EEMI
Arlington, VA
solarsklar@aol.com------------------------------
Original Message:
Sent: 01-26-2022 02:50 PM
From: Steve Kawell
Subject: Hot Air Heat Storage
That heating strategy faded out many years ago and for good reason....it didn't work very well.
I would spend your time and money on additional building envelope insulation and a PV array.
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Steve Kawell
Owner
Durango Solar Homes
Durango CO
stevekawell@gmail.com
Original Message:
Sent: 01-25-2022 05:37 PM
From: George Mattson
Subject: Hot Air Heat Storage
My house was built in 1978 with a very efficient, south-facing, 600 SF hot air collector, inclined 60 degrees from horizontal. A gravel heat storage bin was linked to it. The bin was not, however, able to store heat hot enough to be of benefit on a following cloudy day. A persistent odor from the collector's insulation prevents blowing the air directly into the house. I now blow the hot air directly into my crawl space. A significant amount of heat appears to be lost to the ground in the crawl space.
The house has extensive, high, south-facing windows and an attached greenhouse which add significant passive solar heat. The house is also heated by a gas, hot-air furnace.
I am considering constructing a "room" in the crawl space, approximately 15' x 15' x 3' high, into which the collector's hot air would be exclusively circulated. This "room" would be insulated at the ground and sides and filled with large, sealed containers of water. The intent is that the collector's heat would be stored and pass up through the wood framed floor to a central room in the house.
I'd appreciate comments and suggestions.
Thank you,
George Mattson, retired architect
Bozeman, Montana
406-587-3931