Our Solar Heating
Our Solar Heating
Commercial Sector Drives U.S. Solar Market with 38 Percent Growth in Third Quarter, Solar Costs Continue Decline …
WASHINGTON & CAMBRIDGE, Mass.–(BUSINESS WIRE)–U.S. Solar Market growth continued in the third quarter of 2010 with 27,000 homes and businesses installing solar energy systems.
Are our scientists making solar panels all wrong??
Okay so.. if light deflect the light of the sun and black absorbs it, then aren’t solar panels just absorbing more light, sun and heat into our atmosphere? Wouldn’t this lead to an increase in global warming? Shouldn’t solar panals be white? No rude answers please.
To make electricity, the solar panel MUST absorb energy (heat and light) from the sun. Making them white would reduce the electricity they put out. The reduced electrical output would have to be made up by electricity generated by other means, which might include fossil fuels. A portion of the light and heat absorbed by a solar cell ceases to be heat or light; it is converted to electrical energy. A 100% efficient solar cell (one which converts all of the light and heat which hits it to electricity) would be absolutely black (no reflected light) and cold (all heat converted to electricity. Such a cell is not actually possible.
Our Solar Heating
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August 18th, 2008 at 6:10 am
Great clip. Good quality and very informative
April 8th, 2009 at 5:59 pm
hey this is cool .. do you have any design specs? like how much hot water it can produce?
April 8th, 2009 at 9:40 pm
Currently, it tops out at about 200 litres (50 gallons) at >75 degrees Celsius. It’s a 300 litre tank. The panels’ thermal cutout is set to about 102degrees, which limits summertime solar collection when it overheats (it’s pressurised, so boiling is above 100), and I’m certain we could produce more if we had a convenient store. I’m looking at adding another tank to increase the capacity.
April 8th, 2009 at 9:41 pm
The trick is to arrange the gas-powered boiler (“furnace, in US-speak) to switch off around 1/2 hour before the kids finish showering etc. in the mornings. That way, the system starts solar heating with a fully-cold tank, and the energy transfer is at its most efficient. It usually kicks in around 0930, earlier if the weather is good. The tankful is enough overnight most days, and I fill the kettle from the kitchen hot tap during the day too, so it hits our electric bill as well.
April 8th, 2009 at 9:42 pm
It is hard to get meaningful payback numbers though, as there are too many variations. We decided on 8sqm originally to get a quick reheat time, and to allow for the shadow of the chimney over the panels in the early morning: in the costs of installation, one extra panel over the recommended three wasn’t a major factor (scaffolding access was the real biggie, and we were able to combine the install with several other jobs).
April 8th, 2009 at 9:47 pm
On the whole we’re pleased, more so as energy costs rise. There is little to go wrong (zero downtime so far)., and we could theoretically power the pump with a solar cell array+battery+inverter, meaning no electricity from the grid whatsoever. It’s expensive though and payback would be in decades! . If you’re in sunnier latitudes, you’d need smaller panels: costs would drop dramatically. Today, electricity from solar is expensive and inefficient, but water heating is cheap, easy and effective.
April 8th, 2009 at 9:48 pm
Oh, and the girls still think it’s really cool, too
April 18th, 2009 at 4:35 pm
Bloody fabulous clip. I wish I could be more resourceful like your father. I would receive quite a bit of browny points from my wife. =D
I’m seriously thinking of looking into this option. I live in Texas, in the USA. Light from the sun isnt a problem here. =D
April 20th, 2009 at 12:03 pm
Loved the video, well put together and amusingly delivered by a young girl who should have a career in television.
Andrew
May 30th, 2009 at 5:27 am
lizzie i love you cute girl ….. you are very talened and you shows us how something works in a easy way…..kisses from greece ^^ aki
August 4th, 2009 at 2:28 pm
Congratulations with the project, it looks really professional.
What’s more, you provide useful tips.
Regards from Mexico