[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[TRNSYS-users] several problems with active layer
Dear trnsys users,
I'm having a lot of problems with a simulation with an active layer
(modelling a sort of capillary system, having many small pipes in
parallel;
the panel is split into 4 parts by the autosegmentation in PreBid):
- at some time steps the fluid outlet temperature of the active layer
(ouput 58) oscillates without any physical meaning;
- at these time steps there is a large difference between the energy
input by fluid to zone obtained as Qalfl (output 59) and calculated as
m.c.DT;
- the energy balance of the surface containing the active layer (output
906) is never zero, even when water is not flowing into the panel.
The oscilllations are more likely to occurr if the radiant system is
switched on/off.
Changing the simulation time step from a few minutes to 1 h has no
effect.
Convergence and integration relative tolerances are set to 0.001.
No convergence problem is reported in the list file.
I wonder if anybody encountered such problems with active layers
simulation.
Any suggestion will be useful, since I really don't know how to go on
!
Many thanks in advance
Adriana
----------------------------------------------------------------------------------------------------------
Adriana Angelotti, PhD
Politecnico di Milano
Dipartimento di Scienza e Tecnologie dell'Ambiente Costruito (Best)
v. Bonardi 3
20133 Milano
Italy
Ph +39 02.2399.5183
Fax +39 02.2399.5118
e-mail adriana.angelotti@polimi.it