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[EnergyPlus_Support] Re: abrupt value changing in GSHP simulation results

Haider,

     Your suggestion is something I have missed and thank you, but the problem is still there. In order to see whether this problem only lies in my model, the example files with GHX are investigated and such an abrupt temperature change happens again, mainly at time that HVAC system ON-OFF status changes.The usual phenomenon is a large temperature falling when the system starts operation while a large temperature rising when the system closes, which all happened nearly in a timestep. That is also why I suppose this problem is caused by its fortran code or algorithm. Thank you again!

Zuo

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Haider Khan <haidermkhan@...> wrote:
>
> Zuo,
> 
> You are right, that does not make sense. The first step would be to check the coeffecients of the heatpump model and make sure the model rated capacity is comparable to the building peak load.
> 
> Haider.
> ICF International
> 703.373.6623
> 
> - Sent from my mobile device.
> 
> On Nov 24, 2009, at 10:21 AM, "Zuo" <mingming_zuo@...> wrote:
> 
> Hi all, simulation results of EnergyPlus's GSHP system such as borehole wall temperatures and borehole outlet fluid temperatures seem problematic because the temperatures mentioned above may have a abrupt changing by more than 20 degrees(even more)just within an hour. In my opinion, the real physical preocesses will always bear a smoth trend while the inlet water temperature has a smoth curve. So have you guys come across such problems? And is any setting leading to it? Thank you all in advance!
> 
> Zuo Mingming
>




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