[Equest-users] Modeling Water to Water Heat Pumps

[Karen Walkerman]

In my experience, using the method that Pasha outlined, the heat pumps have
not reliably provided heat if there is no cooling load.  Has anyone been
able to get the heat pumps to be called "on" when a heating loop is calling,
but there is no load on a cooling loop (all cooling would be rejected to the
"ground")?

Thanks,

--
Karen

On Mon, Mar 1, 2010 at 6:39 PM, Pasha Korber-Gonzalez <
pasha.pkconsulting at gmail.com> wrote:

> Daniel,
>
> I am doing a model right now where I am using multiple Water-to-water heat
> pumps in the central plant connected to a geothermal loop.  You were reading
> the correct section of the DOE2 dictionary.  Two things you have to do is
> create a Lake/Well circulation loop and then attach your loop-to-loop hp to
> it.  you will then need to connect the circulation loop to a ground-loop
> heat exchanger which is the component that actually exchanges the heat
> energy with the ground loop and the building.  This circulation loop
> (lake/well) is in addition to a chilled water loop feeding your systems and
> a hot water loop feeding your systems from the heating side of the heat
> pumps.  If you would like some help stepping through these inputs.  Email me
> and we can go through them.
>
> The thing to note about this system option that I don't like so well is
> that you can't modulate the flows through the heat pumps themselves, so your
> pump energy is predicted high.  In my project case I have up to 10 WWHP's
> and I have to have three additional pumps associated with each unit--this is
> really really high pump/aux energy.
>
> Pasha
>
>
> PK Consulting
>
> On Mon, Mar 1, 2010 at 1:59 PM, Anthony Hardman <
> Anthony at geoenergyservices.com> wrote:
>
>>  Not sure if somebody answered this yet or not.  The short answer is no,
>> but hopefully that’ll change soon<http://apps1.eere.energy.gov/geothermal/projects/projects.cfm/ProjectID=111>
>> ?
>>
>>
>>
>> *Anthony Hardman*
>>
>> Mechancial Engineer
>>
>> LEED AP
>>
>>
>>
>> Geo-Energy Services
>>
>> 14250 E Easter Pl, STE C
>>
>> Centennial, CO 80112
>>
>> 303-531-5292 v
>>
>> 303-805-3563 f
>>
>> 720-273-9973 c
>>
>> *www.GeoEnergyServices.com <http://www.geoenergyservices.com/>*
>>
>>
>>
>> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
>> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Daniel Deese
>> *Sent:* Monday, February 22, 2010 3:09 PM
>>
>> *To:* equest-users at lists.onebuilding.org
>> *Subject:* [Equest-users] Modeling Water to Water Heat Pumps
>>
>>
>>
>> Hi All,
>>
>>
>>
>>     We're working on a lab project that will have a 100% outside air
>> control strategy, and therefore significant cooling and reheat loads.  We'll
>> be using pretty standard chillers to provide chilled water, and rejecting
>> the heat to a common ground loop.  For heating, we'll be using water to
>> water heat pumps to remove heat from the common ground loop and put it into
>> the heating water loop (for pre- and re-heat).  And the third component will
>> be a ground loop heat exchanger (vertical wells) to act as the heat
>> sink/source for the heating and cooling extremes.
>>
>>
>>
>>     My question really is this:  Can eQuest model a water to water heat
>> pump?  I found something in the DOE-2.2 volume dictionary about a
>> Loop-to-Loop heat pump, but it doesn't give me any .inp commands or
>> variables, so I'm a little scared to just throw in a loop to loop heat
>> pump.  In addition to my fears, I don't see a "heat pump" heading under
>> which to put it.
>>
>>
>>
>>     If anyone has tried this before and has any insight, it would be
>> greatly appreciated.  thanks.
>>
>>
>>
>> daniel
>>
>>
>>
>> *Daniel I. Deese, EI*| *CRB Consulting Engineers* |
>>
>> 1255 Crescent Green, Suite 350 | Cary, NC 27518 |
>>
>> *P:* 919-852-5443 |* F:* 919-852-5454 | *X:* 4543
>>
>> Email: daniel.deese at crbusa.com
>>
>>
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