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[EnergyPlus_Support] Re: help microCHP model
thank you for your answer!
well, I solved the problem with the first 10 days: there was a mistake in the geometry of the building(a missing wall) and I also changed the option "baseload" in "electric load center:distribution" into "follow thermal". This way temperatures on the three floors of the building are good since the first day.
So I tryed again to convert the model into the 3.0 version of energyplus by energyplus transition program and temperatures are about 40 degrees, so higher then they should be, even if lower then first.
There are no errors in the model neither in the 2.2 version neither in the 3.0, but in the 2.2 there are many warnings(about 1 million!), while in the 3.0 there are only 18 warnings , but no severe errors.
About node mass flow rate and node set point temperatures: I already did that and everything seems normal in both versions.
Thank you also for your suggest to ask direcly to the support, I will do so!
thank you very much!
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@...> wrote:
>
> Giovanni, you said the simulation was working well in V2.2 except for
> the first 10 days and then did not work well in V3.0 (large difference
> in temperature). Are there any new errors in the error file? I would
> suggest you add report variables for node mass flow rate around the
> entire plant loop and check the operation of the plant equipment in both
> V2.2 and V3.0. Also report node set point temperatures if you are not
> already doing so. See if you can see equipment working correctly in V2.2
> and then not working correctly in V3.0. Did you use the EnergyPlus
> transition program to change from V2.2 to V3.0? Let us know what you
> find. This exercise will also give you a better understanding of the
> operation of plant loops. This support site is a user-to-user forum so
> you might also try the other E+ support site where E+ developers will
> help you - energyplus-support@... - you can also attach your file
> to the email. By the way, your English is pretty good.
>
> Giovanni Matarrese wrote:
> > Hello, first sorry for my bad english, I'm trying to improve my
> > knowledge of this language.
> > I'm Giovanni Matarrese from Italy
> > I'm new of the group, I've just joined it.
> > I'm a student of mechanical engeneering and I'm working about a
> > microcogeneneration plant for my thesis work.
> > I began editing an existing model built in energy plus 2.1 where the
> > microchp and the auxiliary boiler where modelled by two purchased hot
> > water(one for each device) because the micro chp model still did not
> > work well when this model was created by the students who worked on in
> > the past.
> > So I first sobstituted these purchased with a Boiler:simple device for
> > the boiler and with the MicroCHP modul for the ICE cogenerator and I
> > inserted the device parameters too in the 2.2 version of energyplus.
> > I also put the micro chp device on the supply of the engine loop and
> > the water tank heater on the demand side of the engine loop, while the
> > heating loop remained the same of the old model excpet of the
> > sobstitution of boiler to the purchased hot water.
> > this model works quite well, except the first 10 days of the
> > simulation, where temperatures calculated by the software are a little
> > higher than they should be.
> > The real problem is that when I try to export this model on the new
> > version of energyplus(the 3.0) results of the temperatures are always
> > very higher than they sholud be(they're about 50 celsius degrees while
> > they should be about 20).
> > Do you now the reason of this problem? can you help me?
> > thank you very much for your attention and your kindness.
> >
> > Giovanni Matarrese
> >
> >
>
> --
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
> 1679 Clearlake Road
> Cocoa, FL 32922-5703
> Phone: (321) 638-1454
> Fax: (321) 638-1439 or 1010
> Visit our web site at: http://www.fsec.ucf.edu
>
> UCF - From Promise to Prominence: Celebrating 40 Years
>
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