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[TRNSYS-users] u-value of wall



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@chri.nl     

Web:  www.chri.nl     

           

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-----Oorspronkelijk bericht-----
Van: trnsys-users-bounces@engr.wisc.edu [mailto:trnsys-users-bounces@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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