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Re: [TRNSYS-users] Error Message 441 after using equation
Ole,
I'm not sure if anyone responded to you about this but it is a
classic problem in controls. It is not just a TRNSYS problem. When your
zone temperature is greater than 24 then the cooling turns on and brings
the zone temperature back to 24C at which point your controller realizes
that cooling should be off because the zone temperature is not greater
than 24. Cooling is turned off and the zone temperature rises above 24C
again. You need to use a controller that has a deadband (cool to 23.5C
and then turn off. Don't start cooling until zone temperature reaches
24.5C - or something like that.
What makes this a little complicated in TRNSYS is that you're mixing
two ways of doing heating and cooling (energy rate control and
temperature level control). I would recommend that you go though the
tutorial called "Temperature Level Control from Energy Rate Control"
that can be downloaded from
http://sel.me.wisc.edu/trnsys/downloads/tutorials_and_examples/tutex17.htm)
Best,
David
On 1/30/2015 03:36, Ole Nienaber wrote:
Dear All,
I'm modelling a building zone with TRNBuild and I'm controlling my
heat and cooling demand by the Heat and Cooling Type Manager. It
worked when I use a simple schedule for my Cooling Type Manager to
control the temperature. But then I tried to use an input instead of
the schedule. In the deck, I implemented an equation which should give
back 1 or 0 while using the mathematical function GT(T_zone, 24), so
that I get back a 1, when my Zonetemperature increases over 24°C and 0
otherwise to regulate my cooling. But when I tried to calculate it, I
received this message like 30 times
TRNSYS Message 441 : The inputs to the listed units have not converged
at this timestep. The values at the last iteration will be used and
the simulation will proceed. Reported information : UNITS: 56
and then this one:
TRNSYS Message 450 : The maximum number of warnings allowed per
simulation has been exceeded. Please fix these warnings or increase
the limit on the number of warnings allowed per simulation (LIMITS
command) Reported information : Not available
Can anyone help me with this problem?
Thank you so much in advance,
Greetings,
Ole Nienaber
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David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
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d.bradley@tess-inc.com
http://www.tess-inc.com
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