Dear Sabine,
My guess would be that
your wall time-base currently equals 1 hour, and that your results will become
more accurate when you use a smaller timebase?
Van: Sabine Jansen -
BK [mailto:S.C.Jansen@tudelft.nl]
Verzonden: woensdag 31 maart 2010
15:38
Aan: trnsys-users@cae.wisc.edu
Onderwerp: [TRNSYS-users]
questions heating demand calculation type 56
I have some general problems with a type 56 simulation, two related to
the calculation of the ideal heating demand and 1 general question.
- When calculating the ideal heating edmand, it
takes two timesteps for the ideal heating to reach the required
temperature setpoint..
Is this normal or what am I doing wrong?
- When using a schedule in
trnbuild, somehow the heating only switches on at exactly the time of
the switch (in my case 7 h and 17 h), while I assumed the schedule to
mean that at the new time the new temperature must be obtained (see
attached document). The heating switches OFF at exactly the changing time,
so it then takes the new setpoint temperature. (see figure 2).
- General question: Does
anyone know why the temperature seems to be fluctuating a little (in other
words: it is not a smooth line) as soon as the heating turns off?
Also when using a smaller timestep the line is not smooth, but the
temperatures stay constant during a hour, so the line looks like a
staircase..
(note: the non-smooth line occurs when the heating is OFF)
(p.s. for some rooms the lines are more smooth than for others. I have
tried different tolerances etc, but didn;t find a soluation)
All is explained in more detail with figures in the
attached file. Has anyone experienced the same or has an idea what I might be
doing wrong?
Thank you very much,
Sabine Jansen
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