[Equest-users] Lake/Well Loop based HP as DHW preheat

[Pasha Korber-Gonzalez]

Hi Eric,

I'm going to try and remember this off the top of my head instead of
searching for an old project file.   I think that you will need to have 3
circulation loops in your Plant side.  a CHW, HW, and L/W Loop.   The HW
side of the loop should be able to connect to the DHW.  If it doesn't work
this smoothly, then you might have to have two HW loops.  One you connect to
the DHW, and one you connect to your air-side systems.

That's my first guess.   I would also suggest that you read through the
Loop-to-Loop chillers & Water-toWater chillers again in Volume 2 so that you
can identify how these equipment will supply DHW preheat...which can be done
in DOE2.

Sorry I can't offer you more details at this time.

Pasha

On Thu, Dec 9, 2010 at 1:07 PM, Boxer, Eric <eboxer at pathfinder-ea.com>wrote:

>
>
> Hello All,
>
>
>
> First, thanks to those who contributed earlier posts on the topic of
> modeling a “Loop to Loop” heat pump with a “Lake/Well circulation loop.
> Those were of great help in developing my model thus far.
>
>
>
> At this point, I would like to try and incorporate a W-WHP tied to my
> Lake/Well circ loop dedicated to DHW preheat.  A separate circ pump runs a
> loop from the W-WHP to a DHW preheat tank, reducing load on the DHW boilers.
> The W-WHP is able to heat a limited flow rate of water to 110F in the
> preheat tank, while the DHW tanks need the extra DHW boiler input  to be
> maintained 140F.
>
> My problem has been the incompatibility between the DHW loop and the
> Lake/Well loop. Then again, maybe preheat should be on a loop separate from
> DHW.
>
> Any ideas?
>
>
>
> Thanks,
>
>
>
> Eric
>
>
>
> *Eric Boxer, EIT | Pathfinder Engineers & Architects LLP*
> Mechanical Engineer
>
>
> 134 South Fitzhugh Street
> Rochester, NY 14608
> T: (585) 325-6004 *ext. 109*
>
> F: (585) 325-6005
>
> eboxer at pathfinder-ea.com <hkashtan at pathfinder-ea.com>
> www.pathfinder-ea.com
>
>
>
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