Re: [TRNSYS-users] Inquiries about TRNsys DST moedl

[Jeff Thornton <thornton@tess-inc.com>]

At 09:20 AM 4/15/2005, Marjorie Thilliez wrote:

> For my project, I need to simulate energy storage in aquifers (in wells 
> and not in ducts or boreholes).

I'm slightly confused.  Do you wish to model wells (vertical holes in the 
ground), or aquifers (horrizontal water layers)?

> Apparently, I may simulate aquifers with the component type 557 (vertical 
> U tube or tube in tube ground heat exchanger) but I read that models, 
> called DST (or TRNVDST) and XST, exist. They are created by Göran 
> Hellström and Daniel Pahud.

You cannot model aquifers with DST or Type 557 (the TRNSYS version of 
DST).  557 is intended for boreholes.  Hellstrom/Pahud have a model which 
models aquifers and I believe that it is in TRNSYS format somewhere 
(XST?  AST?).  You may want to check with them on the availability of this 
model.

> Have you ever used these models? Which kind of problems have you ever met?

I use the Type 557 model all the time and, in my opinion, its one of the 
best models I have ever used in TRNSYS.  We've calibrated it against 
measured data on numerous projects and it has never failed to accurately 
model the ground heat exchanger system.

> Are they included in Geothermal Heat Pump Library?

Type 557 is included in the TESS Geothermal Heat Pump Library.  XST and AST 
are not currently included.

Jeff Thornton
TESS


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