[Equest-users] Loop to loop heat pump

Brian Fountain bfountain at greensim.com
Wed Dec 21 08:40:46 PST 2011

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.


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*
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