I have yet to hear a response on this one, so I'll try again.<br><br>I am trying to model a ground source heat pump system with a ground
source HX. The actual system includes the primary loop pump, Taco
Loadmatch circulators for the individual heat pumps (secondary) and a
pump for the well field. The well field pump flow is 50% of the HP loop
flow. The initial modeling results in full flow from the HP loop
through the well field which keeps the loop temperature low (typically
40s-50sF). The controls for the well field pump is to run the pump when
the loop temperature drops to 33F or exceeds 80F with a 10F "deadband"
(pump stops at 43F and 70F). The primary and secondary pumping is not a
direct issue as I believe I can run the model with the secondary pumps for their
energy use and then eliminate them for subsequent modeling. I have
tried to assign the well field pump to the HX under Attachments, but
this fails to take. eQuest help generally says to create a separate
loop for the HX with its own pump. However, I can not get this to go as
there are no systems assigned to this loop and get an error message for
no load for design. The 50% flow through the well field seems to
create an issue with the primary/secondary loop flow as it appears that
primary flows in eQuest are expected to be greater than or equal to
secondary flows. (I have experienced a similar issue with boiler water
loops that draw a portion of the water from the main heating loop.)<br>
<br>Any ideas on how to deal with this?<br clear="all"><font color="#888888"><br></font><br clear="all"><br>-- <br>Ron Pecarina, PE, CEM, LEED-AP<br>Energy and Sustainable Design Consultants, Inc.<br>1128 Noblewood Drive<br>
Billings, MT 59101<br>406-208-0227<br>