... and here comes the attachment :-) --- Dr. Andreas Heinz Institut für Wärmetechnik / Institute of Thermal Engineering TU Graz / Graz University of Technology Inffeldgasse 25b, A-8010 Graz Tel.: +43-316-873-7313 Fax.: +43-316-873-7305 andreas.heinz@tugraz.at www.iwt.tugraz.at -----Ursprüngliche Nachricht----- Von: Andreas Heinz [mailto:andreas.heinz@tugraz.at] Gesendet: Dienstag, 2. März 2010 23:16 An: 'trnsys-users@cae.wisc.edu' Betreff: error in Type 556 ? Dear TRNSYS-Users ! I just found out about a very strange behaviour of Type 556 "Horizontal Ground-Coupled Heat Exchanger". Im using a very simple configuration, where I enter the heat exchanger with a constant mass flow and an inlet temperature, which is always 3 Kelvin lower than the outlet temperature. The problem is, that the resulting outlet temperature out of Type556 is strongly depending on the TRNSYS-timestep. For example, if I use a time step of 6 min I get -3.8°C, if I use 1 min I get -11.6°C. I attached a Studio-File with an example. Does anyone have an explanation or has anyone observed a similar behaviour ? Are there alternatives to this type for simulating a ground coupled horizontal pipe ? I would be grateful for any support. regards, Andreas --- Dr. Andreas Heinz Institut für Wärmetechnik / Institute of Thermal Engineering TU Graz / Graz University of Technology Inffeldgasse 25b, A-8010 Graz Tel.: +43-316-873-7313 Fax.: +43-316-873-7305 andreas.heinz@tugraz.at www.iwt.tugraz.at
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Project5.tpf
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