[TRNSYS-users] inside convective heat transfer coefficient

[David BRADLEY via TRNSYS-users]

Adnan,

   Yes, you can certainly use the equation that you propose. In TRNBuild 
set the inside convection coefficient for the wall(s) in question to 
"input" (as opposed to "constant value" or "schedule") and add the wall 
surface temperature(s) to your Type56 outputs. Define an equation in the 
Studio for the convection coefficient and pass the result back to 
Type56. You may well need to use a short timestep (and possibly a time 
delay such as Type93) in order for Type56 and the equation to converge 
on a solution. You might also look in the Type56 reference manual 
because it already has a time-varying interior convection coefficient 
model built in. You are able to set the coefficients that the model uses 
by clicking on the "properties" button in the TRNBuild "project" window. 
You'll also have to select "internal calculation" in the wall 
typemanager for each wall that you want to be affected by the algorithm.

kind regards,

  David



On 08/16/2016 22:14, adnan rasheed via TRNSYS-users wrote:
> Hello everyone,
>
> i want to use temperature dependent correlation of inside convective 
> heat transfer coefficient of the wall in TRNSYbuild rather than to use 
> fixed default value. As inside coefficient depends upon difference of 
> the air temp inside and wall internal surface temperature. i want to 
> use TRNSbuild surface temperature output as an input for defining
> inside convective heat transfer coefficient = 1.247 (Tair-Tsurf)^1/3 
> can i use these inputs from TYPE 56 in simulation studio and then 
> after putting equation again insert in type 56. or any other way to 
> handle this problem.
>
> Thanks you for killing your time to read my problem.
>
> Thanks
> Adnan
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at lists.onebuilding.org
> http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org

-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/attachments/20160818/d12ce10b/attachment-0002.htm>