Evacuated tube Solar water heating

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evacuated tube solar water heater on roof


evacuated tube collectors (etc) way reduce heat loss, inherent in flat plates. since heat loss due convection cannot cross vacuum, forms efficient isolation mechanism keep heat inside collector pipes. since 2 flat glass sheets not strong enough withstand vacuum, vacuum created between 2 concentric tubes. typically, water piping in etc therefore surrounded 2 concentric tubes of glass separated vacuum admits heat sun (to heat pipe) limits heat loss. inner tube coated thermal absorber. vacuum life varies collector collector, 5 years 15 years.


flat plate collectors more efficient etc in full sunshine conditions. however, energy output of flat plate collectors reduced more etcs in cloudy or extremely cold conditions. etcs made out of annealed glass, susceptible hail, failing given golf ball -sized particles. etcs made coke glass, has green tint, stronger , less lose vacuum, efficiency reduced due reduced transparency. etcs can gather energy sun day long @ low angles due tubular shape.








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