RE: [EnergyPlus_Support] External heat transfer coefficients

["Michael J. Witte" <mjwitte@xxxxxxxx>]

Well, that would explain it.  In general, I would recommend using the 
detailed convection models instead of the simple.

Mike



On 8 Nov 2002, at 12:31, Andy Tindale wrote:

> OK, I figured out why my external heat transfer coefficients aren't
> affected by windspeed - it's because I used the NoWind option when
> defining my surfaces!
> 
> Andy
> 
> -----Original Message-----
> From: Andy Tindale [mailto:andy@xxxxxxxxxxxxxxxx]
> Sent: 07 November 2002 18:04
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] External heat transfer coefficients
> 
> I am running some steady-state EnergyPlus simulations and am getting
> some unexpected external heat transfer coefficients reported in the
> eso file.  It seems that for rough walls I get an external heat
> transfer coefficient of 12.49 whatever value of wind speed I enter in
> the DesignDay section of the input file.  Using the simple algorithm,
> I would expect this value for windspeed =0 (looking at the equation in
> the documentation) but would expect a much higher value for a
> windspeed of 30 m/s.
> 
> Also, I get this value whether I request the simple or detailed
> external heat transfer coefficient algorithm.  Have I missed something
> here?  I've attached an input file which illustrates the problem. 
> Thanks for your help.
> 
> Andy
> 
> =================================================
> Andrew Tindale, DesignBuilder Software Ltd.
> Palace Chambers, 41 London Road, Stroud, Gloucestershire, UK
> =================================================
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