[TRNSYS-users] loss coefficient pipe/duct

[David Bradley]

Jean,
 Roel is quite correct. However, make sure that the value that you are 
looking at is the loss coefficient per unit length of pipe and not the 
u-value of the insulating material per unit thickness. In either case, 
you need to convert to a loss coefficient based on outer pipe surface 
area as Roel says.
Kind regards,
 David



Roel De Coninck (3E) wrote:
> Jean,
> you have to convert your loss coefficient (based on pipe length) into a loss coefficient based on pipe surface.  Calculate the pipe surface for 1 m pipe length and divide your coefficient by this surface in order to find the value in W/m²K
>
> regards,
> roel
>
>  
>  
>  
>  
>
> Roel De Coninck
> 3E nv/sa
> Vaartstraat 61 
> Rue du Canal 
> B-1000 Brussels
> T +32 2 229 15 18
> F +32 2 219 79 89
>  
>  
> Visit us at www.3E.eu
> Not facing but shaping the changes
>  
>  
> SAVE PAPER: THINK TWICE BEFORE PRINTING!
>  
> This email is strictly confidential and intended solely for the use of the individual to whom it is addressed. Any views or opinions presented are solely those of the author and do not necessarily represent those of 3E. If you are not the intended recipient, be advised that you have received this email in error and that any use, dissemination, forwarding, printing or copying of this email is strictly prohibited.
>
> -----Original Message-----
> From: jean.goetschy at insa-strasbourg.fr [mailto:jean.goetschy at insa-strasbourg.fr] 
> Sent: woensdag 25 juni 2008 9:40
> To: TRNSYS USERS
> Subject: [TRNSYS-users] loss coefficient pipe/duct
>
> Hi every body,
>
> I have a little question about the Type31 Pipe_Duct.
> I also have a problem to give a value for the loss coefficient because  
> TRNSYS want a loss coefficient in W/m²K. The problem is that i only  
> find loss coefficient in W/m.K.... so, if someone of you have an answer.
>
> thank you very much
>
> regards, Jean
>
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at engr.wisc.edu
> https://www.cae.wisc.edu/mailman/listinfo/trnsys-users
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at engr.wisc.edu
> https://www.cae.wisc.edu/mailman/listinfo/trnsys-users
>
>
>
>   

-- 
***********************************************************************
Thermal Energy System Specialists (TESS), LLC 
David BRADLEY                      2916 Marketplace Drive - Suite 104 
Partner                            Madison, WI 53719 
                                   USA
P: +1.608.274.2577 
F: +1.608.278.1475
E-mail: bradley at tess-inc.com 
Web Pages:  http://www.tess-inc.com    and      http://www.trnsys.com

***********************************************************************