FIELD NOTES

ABOUT SOLAR HOT AIR SYSTEMS

DON CHIRAS, H20POWER - Solar hot-air systems capture sunlight energy and
use it to heat incoming air. Heated air is then transferred into your
home, often with a small electric fan. The solar energy costs what it
always has cost - nothing. Solar hot-air systems can help alleviate
homeowners' worries about rising fuel costs and provide years of
inexpensive, maintenance-free comfort. They can heat homes, offices,
workshops, garages and barns.

All solar hot-air systems rely on hot-air panels or collectors.
Collectors are typically mounted on south-facing walls, roofs or even on
the ground, if it's unshaded during the heating season. Some commercial
systems are simple thermosiphon collectors that rely entirely on
convection to distribute hot air, but most use fans or blowers
controlled by relatively simple electronics. A temperature sensor
mounted inside the collector monitors internal temperature. When it
reaches 110 degrees, it sends a signal to a thermostat mounted inside
the home, which turns on the fan if room temperature is below the
desired level. When the temperature inside the collector drops to 90
degrees, or the room reaches its setting, the thermostat turns the fan
off.

Solar hot-air systems actively produce heat only in the daytime, but
some of that heat is absorbed by the building's thermal mass: drywall,
tile, framing lumber, etc. At night, the heat stored in the thermal mass
radiates into the rooms. The more thermal mass, the greater the
nighttime benefit

http://h2opower.blogspot.com/2006/12/buyers-guide-to-solar-heating.html

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DIGITAL GUIDE TO THE AMERICAN REVOLUTION

The digital collections of the Library of Congress contain a wide
variety of material associated with the American Revolution, including
manuscripts, broadsides, government documents, books, and maps. This
guide compiles links to digital materials related to the American
Revolution that are available throughout the Library of Congress Web
site. In addition, it provides links to external Web sites focusing on
the American Revolution and a bibliography containing selections for
both general and younger readers.

http://www.loc.gov/rr/program/bib/revolution/home.html

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