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Home built solar collector question. Thermodynamics?
We've built a flat plate solar collector and it seems to work pretty good, But I'm not an engineer and need some info. we set it up outside just to test it and let it draw in ambient temp air at about 30 degree's Farenheit. on a sunny day we got output temp of about 100 degrees. so a gain of about 70 degrees. on an overcast day we only gain about 20 degrees. What I want to know is if I draw in 65 degree air from the house instead of 30 degree outside air, will I still get the same temperature gain, or will the output temp stay the same? so on overcast day, the internal temp would be cooler than the house air. once the house air warmed the absorber plate to 65 degrees, would we then get output temp of 85 degrees? or would it just cool the inside air?
5 Answers
- 1 decade agoFavorite Answer
Somewhere in between. In ideal circumstances the temperature gain would remain constant. However, there will be heat loss as the air is transported, and since the temperature difference between the output and the ambient will be greater, the loss will also be greater.
So, you'll get a higher output with a higher input, but not with a pure linear relationship.
- 1 decade ago
Solar pannels rely mostly on radiation rather than ambiant air temperature. granted that hot day inside inside is better than an overcast day outside but non the less. im not quite sure if i understand your question about heating air indoors but from what i do understand i would say that it would do neither. the pannel would output a smaller heat gain but at a declining rate as soon the air temp will match the output temperature and you will reach an equalibrium.
- Anonymous4 years ago
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- Anonymous4 years ago
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