Solar Shades: Cheap Passive Heaters
One can reduce one's heating bills and CO2 sinning by installing inexpensive solar shades. The porch windows were equipped with five pull-down shades that generated quite an amount of heat.
Being a nerd, time and temperatures were kept for a period to document benefits. Not only was the air temperature measured but small thermometers attached to the back of the shades indicated the temperature that the reached, normally 110 degrees or more. The total surface area of the shades was about 140 square feet (5x7x4). Needless to say, understanding the thermodynamics of this temperature and surface, a hot porch should not be surprising.
The following are some roughly listed results. Normally, on a sunny day, by 10am the porch/house door was opened to share the passively generated heat with the house. The porch temperature has reached 80 degrees (which this person finds uncomfortable, especially when wearing de rigor winter long-johns!)
Normally, most of this sunlight energy goes into breaking down molecules
that make up the colors and furnishing of our rooms. Interestingly, the optimal
heat transformation of radio energy is the bedrock of quantum physics: black
body radiation (e=hf).
|Using cheap roll up shades painted flat black (total cost for five shades
and paint was $25 in 2007). Here they are drying in the basement. Took about
two hours to paint using a roller and a quart of paint (in lower right hand
corner of picture). Use spray paint only if you want to spend a lot of time
|These are the two shades on the south side of porch. Three face
Shades are also present on several south- and west-facing windows on both mainfloor and basement.
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