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RE: [EnergyPlus_Support] External heat transfer coefficients



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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