[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[EnergyPlus_Support] Re: Extremely high Supp. Heater Electric Power and Low GHX Outlet Temperature

I am just guessing.

In all heat exchangers of this class, earth tube, etc., a table is used for the ground temperature.  There were many choices to be made.  The slab program can be used to investigate the different conditions.

For the vertical tubes, the unwanted ground effect may be reduced by insulation.  I.e. use heat  insulated pipes for some connections.

If the flow rate is low, the temperature of the air at the exit end of the pipe is not the deep ground temperature, but the surface ground temperature.  This may be what you are observing.

Dr.Li

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, eric wang <shaojieworld2005@...> wrote:
>
> Hi,
> 
> I modeled the GSHP system in Chicago. After exporting the variables as listed below, I found that the supplementary heater uses lots of electric power on 01/27 06:00:00. That reduced the efficiency of the GSHP system. Also, the VERTICAL GROUND HEAT EXCHANGER:Ground Heat Exchanger Outlet Temp is very low (1.033 degree C) from 01/26 20:00:00 to 01/27 05:00:00. I am not sure what causes the low water temperature from the ground loop. Can you help me out? 
> 
> Zone/Sys Sensible Load to Heating Setpoint Predicted [W](Hourly)
> WAHP SUPP HEATING COIL:Heating Coil Electric Power [W](Hourly)
> VERTICAL GROUND HEAT EXCHANGER:Ground Heat Exchanger Outlet Temp[C](Hourly) 
> 
> Thanks,
> 
> Shaojie
>




------------------------------------

Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/