[TRNSYS-users] Problem with pipe pressure loss component Type586b

To: "trnsys-users@cae.wisc.edu" <trnsys-users@cae.wisc.edu>

Subject: [TRNSYS-users] Problem with pipe pressure loss component Type586b

From: Robert Burzynski <rbt.burzynski@gmail.com>

Date: Fri, 12 Oct 2012 00:18:20 +0100

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I am trying to model a pressure drop in a small district heating network. For this purpose I use Type586b (Utility TESS library) component.

Unfortunately, I could not find any more detailed description of this component in any documentation.

First question therefore is what friction factor has been used in the pressure loss formula.

Additional problem is with inconsistency of basic modelling results.

The problem is that if the pipe is divided into several segments, even if the segments are identical with the same flow rates and water temperatures, the pressure drops modelled by TRNSYS very significantly. However, for example a reported pressure on one section could be 5730, other section 0.5730 and on another even 5.7559E-15.

Does anyone have any experience with this component?

Any help would be much appreciated.

Kind regards,

Robert Burzynski