RV: [EnergyPlus_Support] GROUND HEAT EXCHANGER:VERTICAL wrong simulation

["Miguel Angel Pascual" <mapascual@xxxxxxxxx>]

Dear Linda:

 

Did you have time to have a look to the files I download last week?

 

Thanks in advance.

 

De: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] En nombre de Miguel Angel
Pascual
Enviado el: martes, 19 de febrero de 2008 18:38
Para: EnergyPlus_Support@xxxxxxxxxxxxxxx
Asunto: RE: [EnergyPlus_Support] GROUND HEAT EXCHANGER:VERTICAL wrong
simulation

 

Thanks for your attention.

I have just uploaded the files to the folder:
<http://tech.groups.yahoo.com/group/EnergyPlus_Support/files/> Files >
<http://tech.groups.yahoo.com/group/EnergyPlus_Support/files/_Problem_Submit
tals/> _Problem_Submittals > ground_heat_exchanger

You will find the following files:

- GSHP_low_fluid_rhocp.idf . It runs fine, but the parameter rhocp of
ground heat exchanger:vertical is very low (4.17e3)

- GSHP_normal_fluid_rhocp.idf . The parameter rhocp of ground heat
exchanger:vertical is OK but the inlet outlet temperatures are impossible.

I have reproduced the problems with the USA_IL_Chicago-OHare_TMY2.epw. You
can find the results in the csv files (also uploaded).

Thanks again.

De: EnergyPlus_Support@xxxxxxxxxxxxxxx
<mailto:EnergyPlus_Support%40yahoogroups.com> 
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx
<mailto:EnergyPlus_Support%40yahoogroups.com> ] En nombre de Linda Lawrie
Enviado el: martes, 19 de febrero de 2008 15:49
Para: EnergyPlus_Support@xxxxxxxxxxxxxxx
<mailto:EnergyPlus_Support%40yahoogroups.com> 
Asunto: Re: [EnergyPlus_Support] GROUND HEAT EXCHANGER:VERTICAL wrong
simulation

I do not see such a report listed in our defect tracking software.

Please upload or send your file so that we can 
fix the problem (if there is one) and be able to reproduce your results.

How did you "solve" the problem?

At 07:42 AM 2/19/2008, mapascualb wrote:
>We are simulating a GSHP with the GROUND HEAT EXCHANGER:VERTICAL model.
>We have found serious stability problems that causes source
>temperatures to go below -100ºC. This problem seeems to be solved if we
>change the rhoCp of Fluid {J/m3K} from 4.1773E+06 to 4.1773e3. I

Linda

EnergyPlus WebSite: <http://www.energyplus.gov> http://www.energyplus.gov
Owner: EnergyPlus_Support list
Member: EnergyPlus Development Team

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