# Water temperature calculation of glass facade

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1. Jan 9, 2016

### Ioana Gherghel

Hello everybody
I am an architecture student working on a facade system and because I do not have much physics knowledge I stumbled across a question I can't answer myself:
If my facade is actually a thin parallelipiped glass tank filled with water, how do I measure the temperature changes of the water inside it throughout a year?

This is a key question for my project because I am aiming at making it a thermochromic facade: because it is pierced through with copper elements and instead of pure water it would be filled with acidic water from the acid rain falling on my site, when the temperature of the water inside the facade would reach 50°C the copper and the acid would start reacting and turning the water blue, therefore cooling the interior by shading it.

The size of the facade is 2500 height x 5000 width x 15mm depth.
Knowing the climate of the site and the number of hours of sunlight shining directly on one of the 2500x5000 side and ignoring details like the materials the glass comes in contact with, what calculation could I do to estimate the temperature of the water throughout the year so that I can estimate when the facade would get blue?

Any help is appreciated. I went around the forum (and the internet) and found some threads that touch on this topic but unfortunately the answers were in a too advanced physics language for me to understand what's being suggested..
Thank you

2. Jan 9, 2016

### Bystander

Fifty C? "Cool?"

3. Jan 9, 2016

Staff Emeritus
Honest opinion? I don't think I would trust any calculation - a glass tank with protrusions that are copper with a coating of some copper salts, water than is acid rain (and with probable biologic elements) and some sort of chemical reaction going on - getting the description right of what I am modeling seems practically impossible. I'd be thinking prototypes and measurement.

4. Jan 9, 2016

### CWatters

I'm not a chemist but are you sure the reaction only occurs above 50C? And what happens when the temperature fall? Don't you want it to let light through again? I don't think it's a reversible reaction but I might be wrong.

5. Jan 9, 2016

### Ioana Gherghel

Thanks for the replies guys :)

From the information I managed to find the reaction needs heating to take place, I am not 100% sure about it though either. I am going conceptual with this project
Indeed it is not a reversible reaction, I've made a system to recirculate the water and also to replace the copper elements so the reaction could take place again freshly :D

Ah I was afraid that it would be more complicated than what I had in mind.