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Re: [EnergyPlus_Support] Triple glazing with integral blinds in the outer cavity





I've definately simulated it...the correspondance I could trace only had this in it:

Construction,2001,                                !- Project external glazing - Material layer names follow:

   38,                                            !- Generic PYR B CLEAR 3MM

   1030,                                          !- AIR 200MM

   2,                                             !- Generic CLEAR 3MM

   Half thickness 1001,                           !- Half AIR 6MM also 3 mm

   20001,                                         !- Blind with high reflectivity slats

   Half thickness 1001,                           !- Half AIR 6MM also 3 mm

   2;                                             !- Generic CLEAR 3MM

 

WindowMaterial:Blind,20001,                       !- Blind with high reflectivity slats

   Horizontal,                                    !- Slat orientation

   0.025,                                         !- Slat width (m)

   0.01875,                                       !- Slat separation (m)

   0.001,                                         !- Slat thickness (m)

   45,                                            !- Slat angle (deg)

   0.9,                                           !- Slat conductivity (W/m-K)

   0,                                             !- Slat beam solar transmittance

   0.8,                                           !- Slat beam solar reflectance, front side

   .8,                                            !- Slat beam solar reflectance, back side

   0,                                             !- Slat diffuse solar transmittance

   .8,                                            !- Slat diffuse solar reflectance, front side

   .8,                                            !- Slat diffuse solar reflectance, back side

   0,                                             !- Slat beam visible transmittance

   .8,                                            !- Slat beam visible reflectance, front side

   .8,                                            !- Slat beam visible reflectance, back side

   0,                                             !- Slat diffuse visible transmittance

   .8,                                            !- Slat diffuse visible reflectance, front side

   .8,                                            !- Slat diffuse visible reflectance, back side

   0,                                             !- Slat IR (thermal) hemispherical transmittance

   .9,                                            !- Slat IR (thermal) hemispherical reflectance, front side

   .9,                                            !- Slat IR (thermal) hemispherical reflectance, back side

   .015,                                          !- Blind-to-glass distance

   .5,                                            !- Blind top opening multiplier

   .5,                                            !- Blind bottom opening multiplier

   .5,                                            !- Blind left-side opening multiplier

  .5,                                            !- Blind right-side opening multiplier

   0,                                             !- Minimum slat angle (deg)

   180;                                           !- Maximum slat angle (deg)


At the time Designbuilder was using v8.1 and automatically assigning it to the inner gap. However, I simulated it in the outer gap using the idf and e+launch. I didn't get any error after I fixed the customers too large slat to gap relationship and I was able to place it in the outside facing gap (as you can see). I may have used v8.2 for this, but I don't remember and can't find the files (probably deleted them). I was able to import the eso file into the existing DesignBuilder project for graphical results. I would definately try upgrading to v8.3.

2015-05-28 16:10 GMT+02:00 adlou92bis@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx>:
 

Dear Jean,


Thank you very much for your message.

I am using v8.1 : could this be the difference ? 
For sure, this configuration cannont be built with the version I have, it says it in the error message "--For triple glazing the between-glass shade/blind must be between the two inner glass layers". Also, I am not using Design Builder but directly from the editor.

So I would be interested to know, if you could really build such a triple glazing with your version ??
 
For the equivalent layer, it really does not work when they are coatings - or at least I don't have the appropriate method. I tried a glazing without coatings : No problem ! But with coatings, the resulting emissivity is too low to be real for one single layer, and to put in energyPlus. Also, the equivalent layer would not consider the very high temperature that the inner coating can reach when simulating with different air temperature or solar angle; and that affects highly the heat transmission.

So, I should try to find this v8.3 version do you recon ?

Best regards,

Adele




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Posted by: Jean Marais <jeannieboef@xxxxxxxxx>


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