[TRNSYS-users] type 557a
David Bradley
bradley at tess-inc.com
Tue Jul 21 13:26:37 PDT 2009
Max,
I think Type557 has a reporting problem. At my colleague Jeff's
suggestion, I ran your simulation out for 5 years. After about two
years, it reaches more or less steady state at which point I started
integrating the amount of energy that I was putting into the ground
(mCp(Tin-Tout)) and the amount of losses from the top sides and bottom.
The difference between the two is small and equal to the storage
internal energy change. I am not sure why Type557 only reports the
losses once every 18 hours. Jeff thinks it may have to do with the
frequency at which the solution for a single bore is superimposed on the
total bore field and then how often that solution is superimposed upon
the far field.
Kind regards,
David
Max Werlein wrote:
> Dear all,
>
> We just produced a small project in order to show the effect. Pay
> attention to the plots. and the period of the appearance of the losses.
>
> Thanks to all
>
> max
>
>
> ------------------------------------------------------------------------
> Date: Mon, 20 Jul 2009 12:39:06 -0500
> From: bradley at tess-inc.com
> To: maxwithhat at hotmail.com
> CC: duffy at tess-inc.com
> Subject: Re: [TRNSYS-users] type 557a
>
> Max,
> Could you send us the project that you are working from so that we
> can take a look at it?
> Thanks
> David
>
>
> Max Werlein wrote:
>
> Dear Matt,
>
> The problem ist not tracing the inputs, outputs and parameters.
> We have been trying to debug the component
> and have encountered the problem explained before:
>
> " While simulating with the type 557a (Ground Heat Exchanger (TESS)) I
> discouverd that the heat losses of the earth control volume to the
> sides, top and bottom (Outputs: 5,6,7) are generating a peak in a
> constant period (roughly 27 hours) while the rest of the time these
> outputs are zero. What I actually want is an output of the losses in
> every timestep. Does anyone have an idea what is actually
> calculated by
> these outputs? Is there an error in the code?"
>
> The problem is that the type is quite commplicated and hence we
> are not able to completely understand the code!
> But the results we get seem to be wrong if ever our interpretation
> of the results in the online plotter are correct!
> The losses to all sides (top, bottom and side) are 0 for nearly
> all the time, only for 1 timestep (after a period off roughly 27
> hours) it get a value. We have tried to understand the timestep
> handeling in the code, which (if we understood well!!) seems to
> convert the unit hours of the main soubroutine into seconds for
> the other soubroutines used, and we suspect that there might be a
> mistake somewhere in the treatment of the losses with the
> different time units! But as mentioned we are not sure and we are
> no experts either !
> Maybe some of you colleages may have an idea,
>
> Sorry for bothering !
>
> Thanks
>
> max
>
>
>
>
>
> > Date: Wed, 15 Jul 2009 20:45:34 -0500
> > Subject: Re: [TRNSYS-users] type 557a
> > From: duffy at tess-inc.com <mailto:duffy at tess-inc.com>
> > To: maxwithhat at hotmail.com <mailto:maxwithhat at hotmail.com>;
> trnsys-users at engr.wisc.edu <mailto:trnsys-users at engr.wisc.edu>
> >
> > Max,
> >
> > To watch outputs (and inputs and parameters) for a component,
> you can use
> > the TRACE feature. Simply click on the component, and then click
> on the
> > footprints icon on the left side of the TRNSYS Simulation
> Studio. Run the
> > simulation. This will print the inputs, outputs, and parameters
> of that
> > specific component to the listing file, *.lst. However, I am not too
> > familiar with Type557
> >
> > Best regards,
> >
> > Matt Duffy
> >
> >
> >
> > ----- Original Message -----
> > From: "Max Werlein" <maxwithhat at hotmail.com>
> <mailto:maxwithhat at hotmail.com>
> > Sent: Tue, July 14, 2009 12:08
> > Subject:[TRNSYS-users] type 557a
> >
> >
> > Dear Trnsys users,
> >
> >
> >
> > While simulating with the type 557a (Ground Heat Exchanger (TESS)) I
> > discouverd that the heat losses of the earth control volume to the
> > sides, top and bottom (Outputs: 5,6,7) are generating a peak in a
> > constant period (roughly 27 hours) while the rest of the time these
> > outputs are zero. What I actually want is an output of the losses in
> > every timestep. Does anyone have an idea what is actually
> calculated by
> > these outputs? Is there an error in the code?
> >
> >
> >
> > Thanks in advance
> >
> >
> >
> > Max
> > _________________________________________________________________
> > Enamórate este invierno con MSN Amor y Amistad
> >
> http://amor.latam.msn.com/channel/index.aspx?trackingid=202694_______________________________________________
> > TRNSYS-users mailing list
> > TRNSYS-users at cae.wisc.edu <mailto:TRNSYS-users at cae.wisc.edu>
> > https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users
> >
> >
> > ----- End of original message -----
> >
>
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> --
> ***********************************************************************
> Thermal Energy System Specialists (TESS), LLC
> David BRADLEY 22 N. Carroll Street - Suite 370
> Partner Madison, WI 53703
> USA
> P: +1.608.274.2577
> F: +1.608.278.1475
> E-mail: bradley at tess-inc.com <mailto:bradley at tess-inc.com>
> Web Pages: http://www.tess-inc.com and http://www.trnsys.com
>
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> ------------------------------------------------------------------------
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--
***********************************************************************
Thermal Energy System Specialists (TESS), LLC
David BRADLEY 22 N. Carroll Street - Suite 370
Partner Madison, WI 53703
USA
P: +1.608.274.2577
F: +1.608.278.1475
E-mail: bradley at tess-inc.com
Web Pages: http://www.tess-inc.com and http://www.trnsys.com
***********************************************************************
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