[Equest-users] Loop to loop heat pump

Karen Walkerman kwalkerman at gmail.com
Wed Dec 21 09:01:32 PST 2011

I have tried on many occasions to get a loop to loop heat pump to work,
with no success.  If you really want to model a loop to loop heat pump, you
may have to use Energy Plus.


On Wed, Dec 21, 2011 at 11:40 AM, Brian Fountain <bfountain at greensim.com>wrote:

>  Without looking at the model, it would seem that eQUEST cannot size the
> heating loop.  The default for loop sizing is "secondary" where eQUEST
> simply adds up the capacity of the coils attached to the loop (not good I
> know -- apparently that is in the works in an upcoming version).  The error
> message suggests there is no heating elements to count up.
> The issue I have had with loop-to-loop heat pumps is and imbalance between
> the loads/temperatures.  On the 4th tab/screen of the loop-to-loop chiller
> type there are 4 temperatures (OK 2 temps and 2 delta T's) that are key to
> getting this system to work.  When I set those to the values in the help
> file, my model ran.  I am no expert on this system type but did get
> "reasonable" (or at least so I thought) values in the 1 building I did
> create that used it.
> If you send your .inp and .pd2 I may be able to have a quick look.
> Brian
> On 12/21/2011 5:22 AM, Chen, Ke-Huang wrote:
> Dear eQUEST users,
> I am modeling a loop to loop heat pump in the eQUEST and it needs to
> attach hot water loop&pump, chilled water loop&pump, condenser water
> loop&pump. After I create these loops and pumps, there is an error in
> simulation shows "Hot water loop has zero design flow. Check input for
> consistency, or specify design loads.". But I did connect heat pump to hot
> water loop. Is there anything I need to input so that the simulation
> will be successful? Does anyone have the experience of modeling a loop to
> loop heat pump? It's my first time model heat pump, any help and suggestion
> will be appreciated.
> Best regards,
> *KeHuang Chen*
> *System Engineer*
> *IC BT Division*
> *Siemens Limited Taiwan*
> *Tel : (+886)2-2652-8888 ext. 896*
> *Mobile : (+886)960548011*
> *Fax : (+886)2-2652-8824*
> _______________________________________________
> Equest-users mailing listhttp://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
> To unsubscribe from this mailing list send  a blank message to EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG
> _______________________________________________
> Equest-users mailing list
> http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
> To unsubscribe from this mailing list send  a blank message to
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20111221/f2210b6a/attachment-0002.htm>

More information about the Equest-users mailing list