[TRNSYS-users] Wind loss modeling

[David Bradley]

John,
   Most of the building models in TRNSYS simply ask for the user to 
supply the external heat transfer coefficient so you can treat it 
however you like. The algorithm that I usually use is from ASRHAE:

h = (AA+BB*WindVel+CC*WindVel**2)*3.6

where h is the external convection coefficient in kJ/h.m2, AA, BB, 
and CC are empirical coefficients that depend on the exterior surface 
material and WindVel is the wind speed in m/s. The AA, BB and CC 
coefficients (again from ASHRAE) would be:

                         AA      BB      CC
Stucco          11.58   5.894   0.0
Brick                   12.49   4.065   0.028
Concrete                10.79   4.192   0.0
Wood                    8.23    4.00    -0.057
Smooth plaster  10.22   3.1     0.0
Glass                   8.23    3.33    -0.036

Cheers,
  David


At 13:30 9/12/2007, J.A. Palyvos wrote:
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>Dear all,
>
>I would appreciate any information on the external forced convection 
>algorithms (i.e. wind loss coefficient expressions) used in 
>TRNSYS.(I am aware of the McAdams/Jurges linear relation used in Type 19).
>
>Many thanks,
>
>J.A. Palyvos, NTUA
>Athens
>
>_______________________________________________
>TRNSYS-users mailing list
>TRNSYS-users at engr.wisc.edu
>https://www.cae.wisc.edu/mailman/listinfo/trnsys-users

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