[TRNSYS-users] u-value of wall

[Jan-Willem van Laer]

Dear TNSYS-users,

 

These questions were asked before by Christophe but weren’t answered. Does
anybody got the answer to these questions?

 

When defining a new wall, TRNBUILD calculates a standard U-value determined 

with combined heat transfer coefficients of 7.7 W/m²K inside and 25 W/m²K 

outside (see volume 6 page 23). These U-values are correct for a vertical 

wall separating an inside environnement from an outside environnement, but 

not for horizontal walls and inside vertical walls. Does TRNBUILD take 

these distinctions into account or does it use these two standard 

coefficients (7 and 25) for every wall types ?

 

A second question in relation with the first one : combined heat transfer 

coefficients normally takes into account superficial convective and 

radiative heat transfers. So wich coefficients are used in calculations ? 

standard combined coefficients ? Convective heat transfer coefficients of 

wall defined in the wall type manager ? Both ?

 

Kind regards,

 

Met vriendelijke groet, 

Jan-Willem van Laer, Assistent Projectleider   

Cauberg-Huygen Raadgevende Ingenieurs BV 

Bezoekadres:      Boterdiep 48, 3077 AW Rotterdam   

Postadres:  Postbus 9222, 3007 AE Rotterdam   

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Fax:  010 - 4254443    

E-mail:     j.vanlaer at chri.nl      

Web:  www.chri.nl      

            

KvK-nummer: 14623897   

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-----Oorspronkelijk bericht-----
Van: trnsys-users-bounces at engr.wisc.edu
[mailto:trnsys-users-bounces at engr.wisc.edu] Namens mohammad abdunnabi
Verzonden: woensdag 7 maart 2007 13:22
Aan: TRNSYS USER
Onderwerp: [TRNSYS-users] Include statement

 

Dear All;

 

I've used INCLUDE statement in my Trnedit program, however, I have
encoutered some problems and I have some enquiry about it: the first thing
that I have used file (e.g file.inc) opend by Notepad. secondly, in the
input file, I wrote the following statement

 

Constants 3

Dr = X1

TK = X2

BTA=X3

 

where X1,X2 and X3 should be read from the file included in the include
statement (file.inc). and the file.inc has the following shape:

 

X1= 0.005

X2= 360

X3= 45

 

the error statement in the list file is as follows:

The referenced variable used in this equation has not been defined in the
TRNSYS input file. The equation begins with the string in "reported
information"

    Reported information  : DR=X1=

 

Please, does the procedure I have followed is right or wrong and any help
will be appreciated

 

Thanks in advance

 

M. Abdunnabi

 

 

 

 

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