sorry….just trying to throw out some topics for ya’all….
Solar panels are made up of silicon-based cells or photovolatics (photo=light and volatics=voltage), which convert sunlight to electrical current. Solar panels are located on the roof and on the south facade of the building, integrated into the window shades. These panels, along with others to the east of the site, provide approximately 20% of the building’s electricity.
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Solar Awnings
Solar panels used as awnings, serve three functions: aesthetic detail, summer sun shading, and energy source.
Clever idea, integrate the panel into the design subtly. I like that.
I agree Jim. That's a very clever idea.
I wonder why I never thought about it?
blueOur Skytrak is sold. Frank sold it for 47k cash. I'm now officially retired as a carpenter. I've offered to fill in for Frank in emergencies, but when he calls, I'll probably say no LOL!
While photovoltaics may be cutting edge and exciting, remember that boring old hot water can be a very cost effective use of solar.
-- J.S.
Ok, so I have a question. I have a solar collector on the roof and using the heated water during the day. I go to sleep and the temp is 5-10ºF with wind chills ~ -25ºF. How does one keep the water in the collector from freezing?
Now, you and I know I don't really have a solar water heater, but the question is just as valid considering I am ignorant. :)
the two ways i know of are
1: anti-freeze or silicone
2: draindown
antifreeze is the most common but requires a heat exchanger in the water tank.... same with silicone systems which are also more prone to leaks
draindown if pretty simple.. a differential thermostat turns the pump on and fills the collector.. when it stops gaining heat the pump turns off and the system drains down into the tank.. requires a vacumn breaker at the high oint of the systemMike Smith Rhode Island : Design / Build / Repair / Restore
Ok, so my ignorance is truly supreme here. :)
I thought the water in the solar collector was pressuraized tap water. lol
I have no direct experience -- I'm in Los Angeles.
-- J.S.
I see you are in Georgia, We're in NC and we use the drainback systems because not only do they drain back when it is freezing but they also drain back when it is the middle of the summer and we are on vacation and the water in out 120 gallon reservoir is at 170 degrees so we won't boil out the heat transfer fluid from out panels. Summer vacations are what kill panels in the south.
Hey Nuke, I am in Northern Canda - 40 degrees celcius is normal. Look for food grade polyethelen glycol ( antifreeze).
If you have a drainback I think some antifreeze is a good idea as the system may not always drain completely.