Ok, according to the manual I understand it is related to the timebase and the transfer functions.
Best regards,
De : TRNSYS-users <trnsys-users-bounces@lists.onebuilding.org>
De la part de Alain GUIAVARCH via TRNSYS-users
Envoyé : mardi 28 septembre 2021 17:13
À : TRNSYS users mailing list at OneBuilding.org <trnsys-users@lists.onebuilding.org>
Cc : Alain GUIAVARCH <a.guiavarch@groupeginger.com>
Objet : Re: [TRNSYS-users] heating load - 1 mn time step
Dear Angel,
Thank you for your help.
Actually I’m not talking about the moment when the set point changes from 17°C from 20° (I agree with you this is normal).
But when we look at what happens each hour of the day, the heat load suddenly changes every hour, even if the set point temperature doesn’t change, this is what I don’t understand : the heat load
curve looks like a « staircase ». It is the same for the temperature, so I think it doesn’t come from the heating power control.
De : TRNSYS-users <trnsys-users-bounces@lists.onebuilding.org>
De la part de Angel Carrera via TRNSYS-users
Envoyé : mardi 28 septembre 2021 11:59
À : TRNSYS users mailing list at OneBuilding.org <trnsys-users@lists.onebuilding.org>
Cc : Angel Carrera <angel.carrera@aiguasol.coop>
Objet : Re: [TRNSYS-users] heating load - 1 mn time step
Hi Alain,
I guess that you are calculating the heating load with unlimited heating power. If that's the case, you are requesting to type 56 that the building reach the setpoint temperature in 1 minute (that might be lot of energy for such a small
amount of time) and the sudden peaks in the heating load appear at times where you have a change in the setpoint temperature. I will suggest that you use a limited power for your heating device, or increase your time step to a time that you find reasonable
to heat your building. In general, smaller time steps are "better", but if you are just interested in calculating your heating load that's not necessarily true, specially if you are interested in calculating peak power. Hope it helps, best regards
Angel
El mar, 28 sept 2021 a las 10:44, Alain GUIAVARCH via TRNSYS-users (<trnsys-users@lists.onebuilding.org>) escribió:
Hi everybody,
I’m simulating a projet with type 56, and 1 mn time step.
I don’t understand the heating load : it varies too much each hour, like something is not interpolated (green curve in the attached file ).
Would anybody have any idea, did I forget something ?
Best,
Alain Guiavarch
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Àngel Carrera Martín
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Llicenciat en ciencies físiques
Sistemes Avançats d'Energia Solar Tèrmica - AIGUASOL
+(00) 34 663 276 680
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