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Published: Tuesday 20 August, 2013

canada goose aviator hat uk canada goose aviator hat uk Do solar panels add to global warming



As far as the solar panels causing global warming Ill try to explain. If you put a b canada goose aviator hat uk lack panel on the ground or on your house and dont connect it to anything, it will absorb solar energy heat during daylight and release it at night radiation. The net heat gain is zero. If you hook up a solar panel in the same place but hook it up to batteries, charge the batteries during sunlight hours and using that energy to electrically heat the home at night. The panels will absorb solar energy during the day but will convert that to electrical energy in the batteries instead of radiating it back into space at night. The result is a net gain in earths temperature.



As far as it goes, youre right: putting up a big black object increases the total amount of energy absorbed from the sun. But thats only part of the story.



If you didnt put up the solar panel, the same radiation would hit the earth. The earth already absorbs 2/3 or so of the energy that comes in albedo .30, so adding even a perfectly black object increases it only by 50%.



But its not even that much, because most of the extra energy absorbed is converted into electricity. Solar panels are about 1015% efficient, so half of the extra energy is turned into electricity rather than heat.



Eventually its put to use and turned into heat, but that heat was going to come from somewhere else anyway. Even if its just powering your DVD player, it turns into heat just the same as if you were using it to heat your house. If you dig up a gallon of petroleum or fission a microgram of uranium, thats heat introduced into the earths atmosphere. And these processes are inefficient: between generation and transmission you lose about 75% of the energy, meaning youve introduced 4 times as much energy into the atmosphere as youve actually used.



So with a solar panel, you add extra heat to the earth by about 25% of incoming solar radiation, but youve offset external costs by about 45% of incoming solar radiation. The net effect is to cool the earth.



And that assumes that the solar panel itself is perfectly black, which isnt the case. Real commercial solar panels have an albedo of about .35, which makes them more reflective than dirt and considerably more reflective than asphalt shingles, which have .03 albedo. In other words, even if you didnt actually use the solar panels for electricity, theyd be cooling the earth just by reflecting energy back into space more than your regular shingles.



>If you put a black panel on the ground or on your house and dont connect it to anything, it will absorb solar energy heat during daylight and release it at night radiation.



Not exactly. Assuming the black panel establishes an equilibrium temperature, its going to be losing exactly as much heat as its receiving during the day. Some will radiate out into space, some will conduct or convect into the atmosphere. As a wild guess, maybe 50/50.



>If you hook up a solar panel in the same place but hook it up to batteries, charge the batteries during sunlight hours and using that energy to electrically heat the home at night. The panels will absorb solar energy during the day but will convert that to electrical energy in the batteries instead of radiating it back into space at night.



The panels are only about 14% efficient, so its the same situation as the pure black panel for 86% of the energy. The remaining 14% will get stored in the batteries and then converted to heat at night. That heat will eventually leak out of the house and warm up the Earth a tiny bit.



I think its much the same situation either way. With the black panel the energy gets canada goose aviator hat uk radiated / conducted/convected right away. With the solar panel a small percentage is stored and not so much is radiated, mostly conducted and convected. Youre partly right as a black panel is going to radiate more into space than a house. But youre taking about maybe some day about 14% of 1% of the differening radiation/convection/conduction fraction, of the Earths surface area. Probably not significant.



Solar energy is very inefficient, and so most of the sunlight that is absorbed by the solar cells is reradiated back as heat. But that leads to a bigger point.



Global warming is the ability, or inability of the Earth to radiate heat/light out past the atmosphere into space. Once the light reaches the surface and is absorbed, it doesnt matter whether it was by a black panel or a solar panel. Energy is energy. A black panel does not radiate energy into space, it emits it into the atmosphere. The use of electrical energy also generates heat which is transferred to the atmosphere sooner or later.



The advertised culprit of global warming is atmospheric greenhouse gases like carbon dioxide, that reflect infrared wavelength energy from the surface back down to the surfa canada goose aviator hat uk ce. The heat generated by sunlight on a black panel, or from the use of electrical energy, is reflected back by the greenhouse gases instead of radiating out into space, no matter what the source.



So no, solar panels do not contribute to global warning simply because of their transfer of light into electricity instead of infrared/heat. The source of the heat black panel or electrical use is not the whole problem. It is the greenhouse gases that trap the heat that is the problem, according to the global warming theory.



Third Law of Thermodynamics in normal speak: only can you never get ahead, you can even break even.



Energy in the form of solar radiation falls on the earth. That energy is absorbed by the planet everything and heat results. Some portion of that energy is lost in the absorption process and the net released as heat is less than that absorbed from the sun. This is true in all cases.



Solar panels, both photovoltaic and heat collectors are subject to the Third Law and they all lose some of the radiant energy striking them in the process of converting that energy into either hot water or whatever fluid or electrical energy. Regardless of the process there is always a net loss of energy. The time delay you mention has no bearing on the total heat gain or loss for the planet. In fact the panel effect reduces the net energy put back into the ecosystem because it introduces another iteration of energy loss through conversion.



The Holy Grail of energy conservation it the ability to use, store or recover the entire amount of energy produced regardless of the source of that energy, burning hydrocarbons, geothermal heat exchange, solar radiation, mice on treadmills forms of energy suffer a net loss in any exchange! If we could avoid that loss we could dramatically reduce the heat lost into the atmosphere or ground water and our net energy gain would also be dramatic!



Check out the super cooled circuits in use to reduce resistance in sophisticated electronic equipment for a good example of the energy savings. Of course the savings do not account for energy lost in the cooling process.



In any event NO solar panels do not contribute to global warming via their operation. Their manufacture is another story altogether!



When people talk about global warming, they are talking about how much of the suns energy is trapped within the atmosphere of earth. This is modulated by the amount of greenhouse gas that is in the atmosphere.



Energy production that uses fossil fuels as the source contributes to greenhouse gas production because it releases carbon dioxide that would otherwise be trapped inside the earth in the form of coal, oil, etc.



Solar panels produce power by converting sunlight directly to electrical power, and therefore do not produce carbon dioxide. Of course, in the fabrication of the panels themselves, energy and materials are consumed that produce some CO2, but this amount is relatively small. canada goose aviator hat uk

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