How to edit the density of the new material in gap library? I want to add water in the gap library.

[LI]

Hello everyone,I'm sorry, I asked about this question earlier. But I didn't describe it clearly.

My research is about liquid flow window, so  I want to add water in the gap library.

I have read chapter 5.1.2.3.4. There is only the calculation method for gas, but the density of water is 1000 kg / m^3,  so I have to modify the density of water manually. Maybe WINDOW 7.7.1 doesn't support this kind of calculation yet?

Thanks for the help.

[LI]

I have seen in other literatures that the calculation of water flow window can be realized by using OPTICS modeling and then importing into WINDOW 7.7.10. Maybe I should do the same.

在 2020年8月26日星期三 UTC+8下午7:00:16，LI写道：

[D. Charlie Curcija]

I don't think that you can model water in either OPTICS or WINDOW. This is not supported currently.

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D. Charlie Curcija, Ph.D.                              Tel: (510) 495-2602

Lawrence Berkeley National Laboratory         Fax: (510) 486-4089

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[Mostafa Mohamed]

Dear dccu...@lbl.gov,
 

I hope this message finds you well. Based on the current matter, I want to do the same task but I don't want to include the liquid as a moving fluid film, because I want to study the daylighting performance only of the proposed window. Thus, I want to apply water as a new fixed film that has optical and thermophysical characteristics. Please guide me on how can I add a new film in Window7 or Optics6 to build the whole glazing system.

Thanks in advance and waiting for your reply

Regards,

Mostafa

[Jacob C. Jonsson (LBNL)]

Hi Mostafa

One of the issues with water is that the index of refraction is significantly different from gasses (and vacuum) but in WINDOW all gaps are considered to have a refractive index of 1 which prevents you from having a a water gap material. 

A lot of people have looked at this, but there is some work that has to be carried out outside of WINDOW/EnergyPlus to generate the window properties. Two examples:

https://www.sciencedirect.com/science/article/abs/pii/S036013232101026X

https://www.nature.com/articles/s41467-022-31527-6

[D. Charlie Curcija]

Hi Mostafa,

It is the same answer. It is not supported. Solid surface applied film is measured on a substrate. I don't see how would you do it with liquid,  considering the construction of the spectrometer. You may be able to use one of those hand held spectrometers (like Ocean Optics) and measure actual installation in the field. Another option is to measure VT directly using lycor sensors. One on each side of glazing and taking the ratio. 

Charlie 

https://groups.google.com/g/berkeley-lab-window

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