Re: [EnergyPlus_Support] Modeling of a partially cascaded heat pump system

["Michael J. Witte" <mjwitte@xxxxxxxx>]

This will be difficult to model.  EnergyPlus does not have an air to water heat 
pump.  For cooling operation, you can use an air cooled chiller with 
appropriate performance adjustments.  For heating operation, you could use the 
heat pump water heater, but this requires modeling a hot water storage tank so 
there is extra complexity.

To model the cascaded heat pump, use UnitarySystem:HeatPump:WaterToAir and put 
the water side of the heat pump coil(s) in series on the same branch as the 
radiant cooling panel, and set both component control types to SERIESACTIVE.  
But there are some control issues, and I am not completely sure this will 
simulate properly.

Mike



On 9 Nov 2007 at 1:33, zh_guangyu wrote:

>    Hello,I am getting started to use E+...the system consists of two or 
> more heat pumps,the primary air to water heat pump provide chilled 
> water for radiant ceiling,and part of the return water acts as cooling 
> water for another small water to air heat pump that only processes 
> fresh outside air. ... how to establish the model? Thanks.
> 
> 
> 
> 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 not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the
> Documentation link and press the "search" button.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 


========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
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 not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.

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:
    mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    mailto: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/