[TRNSYS-users] transparent insulation

[Diego A. Arias]

Hi Irene,
Here is another answer from Monika Schulz at Transsolar:

Dear Irene,
as far as I know there is no (published) non-standard type for the simulation of trasparent insulation. 
Anyhow it should be possible to generate a "window" if the parameters for WINDOW4.1 are known. Then you can connect this window to the wall behind passing a fictive zone (very small capacity, very high heat transfer coefficient). 
Kind regards
Monika



Diego A. Arias wrote:

>Hi Irene,
>
>I have not seen a reply to your question. When the building model was 
>written, who would have thought that someone wanted transparent 
>insulation? ;-)
>
>Here are my humble ideas. I will appreciate if someone else has a better 
>answer to share it with the mailing list.
>
>Having transparent insulation will affect your energy balance on the 
>wall in two ways: modifying the incoming solar radiation and the overall 
>heat transfer coefficient.  My idea is to do the following:
>- In TrnBuild, add the layered wall without the layer corresponding to 
>the transparent insulation.
>- Select the external heat transfer coefficient to be an input.  You 
>will have to calculate it outside of TRNBuild, with an equation, taking 
>into account the resistance of the insulation.
>- To address the effect of the optical properties on the solar 
>radiation, you can use Type35 (window) to calculate the transmitted 
>energy through a very simple glazing system; the simplest mode uses the 
>index or refraction of the material to calculate the transmissivity.  
>You can then use this modified solar radiation as the solar radiation 
>hitting on your insulated wall.  NOTE: set the area of the window to 1 
>m^2, because the output of Type35 is energy and not energy per unit area.
>
>This approach is an approximation. You will have to work out the 
>details. For example, you can complain that the external heat transfer 
>coefficient will be applied to a different temperature on the surface of 
>the wall. 
>
>Please let me know if this helps.
>Best regards,
>
>Diego
>
>
>Irene Koronaki wrote:
>
>  
>
>>Dear Trnsys Users,
>>How do we simulate transparent insulation? Is there any type that should be
>>connected to Type56?
>>Thank you in advance for your help.
>>
>>
>>Irene P.Koronaki
>>Dr. Mechanical Engineer
>>Department of Building Applications
>>Centre for Renewable Energy Sources
>>19th klm Marathonos Ave.,
>>Pikermi, 19009, Greece
>>Tel: +30 210 6603255, 6603300
>>Fax: +30 210 6603305
>>Email: ikoron at cres.gr
>>URL: www.cres.gr 
>>
>>
>>_______________________________________________
>>TRNSYS-users mailing list
>>TRNSYS-users at engr.wisc.edu
>>https://www.cae.wisc.edu/mailman/listinfo/trnsys-users
>> 
>>
>>    
>>
>
>
>  
>


-- 

Diego A. Arias
TRNSYS Coordinator
Solar Energy Laboratory
University of Wisconsin - Madison
1500 Engineering Drive
Madison, WI 53706