RE: [EnergyPlus_Support] Air-to-Water heatpump

[Pedro Rodrigo <pedromanuelrc@xxxxxxxx>]

Hi,
I made the same question some months ago so I'm
sending you several messages I received. I hope its
usefull for you:

On 1 May 2005, at 17:54, Pedro Rodrigo wrote:
> 
> > Dear all.
> > I have realized that there is not a model
available
> in
> > EP for a reversible cycle air to water heat pump
> > (central equipment).
> > I'm really interested in using this unit in my EP
> > simulations.
> > Do you have a creative idea to implement something
> > similar to this kind of equipment?
> > Thanks a lot,
> > Regards,


--- "Michael J. Witte" <mjwitte@xxxxxxxx> wrote:
> ---------------------------------
> A heat pump water heater model, based on the
DOE-2.1E
> model, is scheduled to be 
> in the Fall 2005 release of EnergyPlus.  
> 
> Until then, please tell me more about the system you
> wish to model.  What will 
> this heat pump serve - domestic hot water, space
> heating, space cooling?  Will 
> the air-side source/sink be inside the building or
> outdoors?


On 3 May 2005, at 11:38, Pedro Rodrigo wrote:

> Thanks Michael.
> The heat pump has two operating modes: one for
cooling
> water, one for heating water. This conditioned water
> is only used for space heating and cooling through
> several two-pipe terminal units such as Air Handler
> Units and Fan-Coils.
> The heat-pump transfers heat between outside air and
> the water loop.
> I hope this information was what you asked for.
> Looking forward to hearing from you,
> Regards,
> Pedro

--- "Michael J. Witte" <mjwitte@xxxxxxxx> wrote:

A possible solution would be to use
HEATPUMP:WATERTOWATER COOLING and 
HEATPUMP:WATERTOWATER HEATING (see example files
GSHP-GLHE.idf and 
PlateHeatExchanger.idf).  The source side of the heat
pumps would be placed on 
the demand side of a PLANT LOOP.  Set up this plant
loop with dual setpoints 
and supply it with PURCHASED:CHILLED WATER and
PURCHASED:HOT WATER 
(5ZoneWaterLoopHeatPump.idf) and set the setpoints to
be schedules which track 
the outdoor dry bulb temperature +/- a small amount. 
You could read in the 
schedules using SCHEDULE:FILE:COMMA. This is rather
messy and difficult to set 
up, and I am not completely sure it will work.





Pedro Manuel Rodrigo Cruz
University of Jaen, Spain


		
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