[BLDG-SIM] GSHP System Pump Error

Keith Lane keith_lane at g-g-d.com
Thu Oct 18 10:55:32 PDT 2007

I am modeling a 46,200 hotel with a geothermal well heat pump system in
the detailed interface of eQUEST and am running into a few problems. I
am fairly new to the program so please forgive my ignorance. I searched
the previous threads and could not find any solutions and would highly
appreciate any assistance.


*	For heating only zones, there will be electric unit heaters
installed. ASHRAE Std. 90.1-2004 states "Where no cooling system exists
or no cooling system has been specified, the cooling system shall be
identical to the system modeled in the baseline design." For such spaces
I have specified a packaged single zone unit. Specifying electric heat
and a water cooled condenser connected to the GSHP Loop. Is this the
correct approach?


*	When I go to perform a simulation I am prompted with "PUMPd
Error: PUMP design input is unreasonable Check values." The GSHP system
has (2) pumps and I have input their specifications per design. Does
anyone have any suggestions? Could this be due to the electric unit
heaters being modeled with cooling, thus increasing GPM?


*	I am also having trouble with my DHW Loop Pumps. I receive an
error stating: "Pump: DHW Loop Pumps has user specified parameters that
force the mechanical efficiency to be unreasonable. Check input or allow
the program to calculate the kW. Calculated mechanical efficiency=
0.071."  Once again I have entered the pumps' specifications per design


Thank you,


Keith Lane, LEED AP

Mechanical Engineer


Consulting Engineers                     Inc.                        

370 Faunce Corner Road, Dartmouth, MA 02747 

p.508.998.5700                          f. 508.998.0883


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