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Join Date: Oct 2016
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A Question About Two Stage Solar Stills

10/14/2016 1:25 PM

what will be the energy balance equation for this type of solar stills?

http://i.imgur.com/fuQWytd.png

what will be the energy in , in the second stage for both water and glass ?

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Guru

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#1

Re: A Question About Two Stage Solar Stills.

10/14/2016 1:42 PM

Energy balance? The sum of all the inputs equals the sum of all the outputs plus the sum of all the accumulations. Simple.

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#2
In reply to #1

Re: A Question About Two Stage Solar Stills.

10/14/2016 2:13 PM

i know that :)
i just can't figure out what is it

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#11
In reply to #2

Re: A Question About Two Stage Solar Stills.

10/19/2016 4:22 PM

With the information available so far, neither can anyone else.

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#3

Re: A Question About Two Stage Solar Stills.

10/14/2016 2:29 PM
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#5
In reply to #3

Re: A Question About Two Stage Solar Stills.

10/14/2016 10:54 PM

Nice find!

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#9
In reply to #3

Re: A Question About Two Stage Solar Stills.

10/17/2016 10:36 AM

Looks like the difference starts in equation 8 and a determination of whether qloss is a loss to the upper basin or a gain to the upper basin. Also, the upper basin has wind loss while the lower basin does not. Finally, the insolation energy into the lower basin is original insolation minus the energy used in the upper basin. I can see some counterproductive feedback loops in energy flow. No wonder the single stage paper had to resort to numerical methods rather than a direct mathematical solution. I've noticed though that when one has FEA and CFD available, most tend to get mathematically lazy and go for "close enough".

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#4

Re: A Question About Two Stage Solar Stills.

10/14/2016 10:51 PM

Once you have the formulas the outcome will depend on location, solar and weather conditions.

You do want to know the flow rates of the system, right?

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#6

Re: A Question About Two Stage Solar Stills

10/15/2016 11:39 PM

thanks guys for the help
i still don't understand it very well :(
here is the whole file
https://drive.google.com/open?id=0BzbKlVHaqXD8a1FJRXhwMVNQckU
from part 3 to the end

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#7
In reply to #6

Re: A Question About Two Stage Solar Stills

10/15/2016 11:45 PM

What is your best effort at an answer?

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#8
In reply to #7

Re: A Question About Two Stage Solar Stills

10/16/2016 8:58 AM

Nothing for now.

Looks like more effort goes into it.

There is still hope . . .

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#10
In reply to #6

Re: A Question About Two Stage Solar Stills

10/17/2016 11:42 AM

You should relate water output model to solar power input, and rate of thermal cooling of final stage vapor, since the other heats are presumed to be exchanged within a small fraction of totality.

Does that help you establish better boundary conditions?

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#12

Re: A Question About Two Stage Solar Stills

10/21/2016 6:48 AM

Single slant sun powered still assimilates the warm vitality from daylight to distillate contaminated water into clean water in an encased space. Essential of warmth exchange and vitality adjust were the administering conditions for the operation of single incline sun oriented still. A scientific model was produced to express these thermodynamics practices. In the model, basic parameters had been recognized, for example, incline point of glass cover, mass of water in bowl and wind speed. Recreation had been completed and comes about uncovered the significance of the slant edge coordinating the scope of the trial area, the expanding of water mass in the bowl prompting diminishing of clean water generation and the nearness of wind speed likewise increment the yield just when the daylight is still adequate.

The warmth exchange vitality adjust display for single incline sun powered still is connected in light of the warmth exchange prepare from the bowl of sunlight based still, to the water in bowl, glass cover lastly discharged to the encompassing. Convection, radiation, dissipation and buildup handle occurred in sun based still operation with thought of basic parameters recognized as the slant edge, mass of water in bowl and wind speed. Reenactment completed uncovered the significance of the slant edge coordinating the scope of the trial area, the expanding of water mass in the bowl prompting diminishing clean water delivered and the nearness of wind speed will build the yield just when the daylight is adequate.

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#13
In reply to #12

Re: A Question About Two Stage Solar Stills

10/24/2016 11:05 AM

Less ghanga speak, more math.

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