[TRNSYS-users] Wind loss modeling

[Abadie Marc]

John,

We have recently published the results of our CFD investigation of  
external convective heat transfer coefficients:

M. Emmel, M.O. Abadie, N. Mendes, New external convective heat  
transfer coefficient correlations for isolated low-rise buildings,  
Energy and Buildings (39)3: 335-342, 2007

You will find in this article expressions for vertical walls and roof  
that take into account the wind velocity and direction.

Regards,

-- Marc O. Abadie
Visiting researcher at Pontifical Catholic University of Parana ?  
PUCPR/CCET/Thermal Systems Laboratory - LST - Curitiba ? Brazil
Associate Professor at LEPTAB - University of La Rochelle, France




Quoting David Bradley <bradley at tess-inc.com>:

> 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:
>> Content-Type: multipart/alternative;
>>        boundary="----=_NextPart_000_0010_01C7F584.16361600"
>> Content-Language: el
>>
>> 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
>>
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>
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