[BLDG-SIM] eQuest Geo-thermal Heat Pump Sweeden-G functions

[Xia Fang]

Hi, all
 
When I define Geothermal heat pump with "Vertical Well Sweeden-G"
functions, I encountered warning messages in the detailed simulation
output saying no real root messages like this.
 
 
"**WARNING**************************************************************
********
             Pump: GSHP Loop Pump                   cannot match the
system
             flow at the minimum required head.
             Required system flow =  125.7 gpm at head = 150.0
             Pump balance point =   91.8 gpm at head of  85.1
             If the pump was sized by default, most likely this
             is caused by a primary equipment unit operating at
             greater than its design flow, and causing a pressure
             drop greater than design.  Try increasing the pump
             head or head ratio to compensate.
             First occurrence is on  1/ 1, hour  2
CURINV: No real root for CURVE: 
 1  1.353483  0.015932 -0.369414  0.000000  0.000000  0.000000
CURINV: Result out of limits for CURVE: 
-0.136926  0.180053  1.353483  0.015932 -0.369414  0.000000  0.000000
0.000000
X, Y, and Z:  1.000000  0.000000  1.344375 MMDDHH:   1   1   2"

Though I havenot put in pump GPM OR FLOW HEAD..... Has anyone
experienced this before? And what would be the fix to it?

Thanks

Xia

Xia Fang, PE, LEED AP
EMC Engineers, Inc.
www.emcengineers.com
Making buildings work.  Better.
(303) 974-1232
(303) 974-1239 (fax)

 




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