[TRNSYS-users] Type342 parameters

[Mathieu Riegger]

Dear Clement Rebillard,
 
we are also simulating CSHPSS with type 342. There is a German thesis available from Stefan Raab from 2006 (Simulation, Wirtschaftlichkeit und Auslegung solar unterstützter Nahwärmesysteme mit Heißwasser - Wärmespeicher, Cuvillier Verlag, GöttingenISBN 3-86727-048-1) in which a validation of the XST model is done with measurement data of the CSHPSS in Hannover-Kronsberg, where the storage volume is 2750 m³. The conclusion is that 30 segments give the highest accuracy for the case given. Furthermore it is adviced not to use any connections at the bottom segment, because this leads to an overestimation of the heat loss rate of the storage bottom. For details you should check the thesis.
 
Hope this helps.

 
Best regards,
Mathieu Riegger



Dipl.-Ing. Mathieu Riegger
 
Solites
Steinbeis Forschungsinstitut für solare und zukunftsfähige thermische Energiesysteme
Steinbeis Research Institute for Solar and Sustainable Thermal Energy Systems
Nobelstr. 15, 70569 Stuttgart, Germany
Tel.: +49 711/6732000-50, Fax.: +49 711/6732000-99
Email: riegger at solites.de, Internet: www.solites.de

Ein Unternehmen im Verbund der Steinbeis-Stiftung
An Enterprise within the Network of the Steinbeis-Stiftung
 
Zentrale: Steinbeis Forschungs- und Entwicklungszentren GmbH
Haus der Wirtschaft, Willi-Bleicher-Strasse 19, 70174 Stuttgart
Geschäftsführer: Dipl.-Ing. (FH) Uwe Haug, Registergericht Stuttgart HRB 25312
 
Zentrale: Steinbeis Innovation gGmbH
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________________________________

Von: REBILLARD, Clement (Stagiaire CRPE) [mailto:Clement.REBILLARD at veolia.com] 
Gesendet: Dienstag, 5. Mai 2009 11:54
An: trnsys-users at cae.wisc.edu
Betreff: [TRNSYS-users] Type342 parameters



Dear users,

 

In my study on CSHPSS, i use tye342 from Transsolar to model a seasonal storage. Does anyone have a better explanations of the parameter's meaning than the explanation given in the Manual (Type_342_en.pdf) ?

 

I tend to understand most of the parameters, but some remain very unclear, namely the value of parameter 2 : « segments ». As the parameter's value rises (10, 50, 100 for example), the temperatures in the storage tend to decreases, and hence the Solar Fraction decreases ...

 

What is the meaning of this parameter and what values are acceptable ?

 

It seems that transsolar doesn't have any other paper/manual than the one i have (37 pages in wich 5 list-pages present the parameters (only names), then 12 text-pages present the principle (very unclear) and then, schemes, drawings, graphs ...).

 

Many thanks for your help,


Clement Rebillard

Veolia Environment

 
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