Re: [TRNSYS-users] loss coefficient pipe/duct

[David Bradley <bradley@tess-inc.com>]

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
>
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> Roel De Coninck
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> -----Original Message-----
> From: jean.goetschy@insa-strasbourg.fr [mailto:jean.goetschy@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
>
>
>
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