Re: [EnergyPlus_Support] Re: A question on heat pump

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

In this case, the supply air temperature will be whatever the mixed air 
temperature happens to be.  If the outside air fraction is high, the this 
system will deliver very cold air to the zone.  If you anticipate that this 
would be too cold, then a preheat coil must be added to warm the cold outdoor 
air or to warm the mixed air.

Mike


On 17 Oct 2006 at 3:11, eric_zhou1223 wrote:

> Dear 
> 
> A similar enquiry like that..
> If an center zone still demands cooling from the individual heatpump in the
> cold winter, 
> how does the HeatPump diliver the cooling air?  The supply air  have a
> temperature lower 
> than ambient temperature(see, -5 C)? Any way the supply air in evaporator
> should be 
> always cooler than the condenser outoor in the cooling cycle.
> 
> Or the HP is using an imaginary cool air to meet the cooling load against
> possible 
> incomfortable ice-cold air coming into the zone?
> 
> Thanks in advance
> 
> Eric
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" <mjwitte@...>
> wrote:
> >
> > It is controlled by the zone thermostat.  The heat pump will try to provide
> > cooling when the thermostat calls for cooling, likewise for heating.  One
> can 
> > schedule individual coils, so it is possible to disable cooling or heating
> with 
> > a schedule if desired.
> > 
> > Mike
> > 
> > 
> > On 28 Sep 2006 at 14:13, deserteagle_zhou wrote:
> > 
> > > Hi,all
> > > 
> > > I was wondering which field controls the heatpump' cooling/heating
> operation
> > > mode. Or the 
> > > modes are just shifted by the difference between the indoor air
> temperature
> > > and the setpoint?
> > > In my simulation module with a internal zone and four external ones, I put
> one
> > > heatpump per 
> > > zone. I  hope the heatpump in the internal zone can cool the space( wiht
> large
> > > heat gains) in 
> > > the winter while others in outside zones are delivering heat.
> > >  
> > >  Thank you in advance.
> > >  
> > >  John
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 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.idf and press
> the
> > > "search" button.
> > >  
> > > Yahoo! Groups Links
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > 
> > 
> > 
> ======================================================
> ==
> > Michael J. Witte, GARD Analytics, Inc.
> > EnergyPlus Testing and Support      
> > EnergyPlus-Support@...
> >
> 
> 
> 
> 
> 
> 
> 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.idf and press the
> "search" button.
>  
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 






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.idf 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/