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Re: [TRNSYS-users] Overall heat transfer values of walls

To: "a8304506@graduate.hku.hk" <a8304506@graduate.hku.hk>, Trnsys discussion group <trnsys-users@engr.wisc.edu>
Subject: Re: [TRNSYS-users] Overall heat transfer values of walls
From: Mariëlle Nuchelmans <M.Nuchelmans@chri.nl>
Date: Wed, 29 Sep 2010 08:10:21 +0200
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Thread-topic: [TRNSYS-users] Overall heat transfer values of walls

The reference U-value is calculated with standard convective heat transfer coefficient. So it you change this coefficient, the U-value changes while calculating, but the indicated value stays the same (but it doesn't calculates with this value) 

The standard values are: inside: 7,7 outside: 25 (radiation coefficient included)

Kind regards,

Mariëlle 

Van: a8304506@graduate.hku.hk [mailto:a8304506@graduate.hku.hk] 
Verzonden: woensdag 29 september 2010 2:26
Aan: Trnsys discussion group
Onderwerp: [TRNSYS-users] Overall heat transfer values of walls

Hello, everyone.

When I edit a wall type in Type56, there is a u-value indicated with the remark
"for reference only".  What is the meaning for this u-value?  It seems that
this figure does not change even if I use different values for the convective
heat transfer coefficient for the wall.  If I want to know the actual overall
heat transfer of the wall, how can I find it?  Please advise.  Thank you!

Best Regards
LEE, Chun Kwong
Division of Building Scienece and Technology
City University of Hong Kong

References:
- [TRNSYS-users] Overall heat transfer values of walls
  - From: a8304506@graduate.hku.hk

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