Simulation with blinds doubt

jokin00 · Posts: 32

Hi all,

I want to compare the difference in heating and cooling values using vertical blinds in different facades. For this, I have use window shading (the blinds must be 2 meters far away from the window and I want to compare with different angles). the first problem I've found is that you can only set 1 meter in distance from window to blinds and 1 meter between each slat.

But then, when I run the simulation, I don´t understand the results given.
I thought that if you use blinds, the cooling would decrease while the heating would increase (as you have less solar gains). But in my results both of them decrease.

Thank you for your help!

Andy Tindale · Posts: 2371 Location: Stroud

There was a bug with vertical blinds in an earlier version of EnergyPlus. Have you tried DB v2.3.5 with EnergyPlus v6?

Andy

jokin00 · Posts: 32

Hi,

I'm using version 2.25.004, as I have some problems with the new beta version. Another DB member (Andy Smith) is trying to solve it.

But the problem is that when I dara a really simple building (a cube with the default materials) the results seem to be ok, but when I change the building, or the materials...the results get wrong.

Thanks!

jokin00 · Posts: 32

Hi,

I have tried with the new beta verison, and the results are quite the same. If I use vertical blinds in a SE and SW facade, both cooling and heating decrease Shocked

if that possible or I have done something wrong?

Thanks!

Andy Tindale · Posts: 2371 Location: Stroud

I'm not sure if that's possible. Have you tried using horizontal blinds instead to see if you get similar results?

Andy

jokin00 · Posts: 32

Hi Andy,

thanks for your answer. If I use horizontal blinds the results seems to be ok. Do you want me to attach the file to take a look on it?

Thanks a lot!

Andy Tindale · Posts: 2371 Location: Stroud

If you have a relatively simple model which illustrates a problem with vertical blinds please do send it.

Bear in mind that internal blinds can in some cases increase cooling loads as they can cause more solar gain to be convected to the zone air rather than absorbed in the floor and walls.

Thanks

Andy

jokin00 · Posts: 32

Hi,

I attach the file. I think is quite a simple model, is a cube. But I don't understand the results. Maybe I've done something wrong. If you can take a look...

Thanks a lot.

Andy Tindale · Posts: 2371 Location: Stroud

So is your question "If I use vertical blinds in a SE and SW facade, both cooling and heating decrease"?

Andy

jokin00 · Posts: 32

Hi Andy,

thanks for your time. That is my question more ore less. If I use outside vertical blinds in SW and/or SE facades, I guess that the cooling would decrease and the heating would increase, but both of them decrease, and I don't understand if is it possible.

Thanks.

Andy Tindale · Posts: 2371 Location: Stroud

I'm not sure but the blinds do add extra insulation so that may account for it. Is this specifically a vertical slatted blind question or both horizontal and vertical slatted blinds?

Andy

jokin00 · Posts: 32

Hi,

it only happens with vertical blinds, and they are 1 meter far away from the window, that's why I don't understand teh insulation.

jokin00 · Posts: 32

Hi,

I think that as the blinds are a little far away from the window and 1 meter separated between them they don´t insulate the wall, but maybe could be an explanation because they stop the wind?

Andy Tindale · Posts: 2371 Location: Stroud

Have you tried using a more typical blind-window distance to see if this changes results?

Andy

jokin00 · Posts: 32

Hi,

with distance=0,3 meters the results are quite similar. Embarassed

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