Question about Boundary Condition Convection

[Ajaysingh Patil]

I have imported a glazing system  from WINDOW  into THERM.  The Hc Value before the calculation and after the calculation remains the same for the  internal glazing BC. Does that mean for Glazing, the Hc values are not updated according to the surface temperatures once the section is simulated in THERM ? I understand that the Hc value is calculated in WINDOW, But then based on the equation for Natural Convection and the boundaries, these temperatures should be updated

"The internal convective heat transfer coefficient is a function of internal glazing layer surface temperature, Tb,n, for the case of natural convection so it is necessary to update the value of hcv,int as the solution of the glazed area heat transfer model proceeds."

Please correct me if I am wrong.

[Ajaysingh Patil]

by hc for glazing I specifically mean the edge of glazing. Since in the NFRC simulation manual, Centre of glass or glazing is a 1D heat transfer model. where as edge of glass should be a 2d heat transfer model and thus with updated surface temps for Hc calculation ?

[Robin Mitchell]

Can you provide the THERM file and indicate, possibly in a screenshot, the values you are talking about. 

Robin

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Robin Mitchell

Building Technology and Urban Systems Division
Energy Technologies Area
Lawrence Berkeley National Laboratory