[Equest-users] Help with modeling Geothermal system

[Kelly Bucklaew]

Good Afternoon eQuest users,

I am looking for some help with an equest modeling problem as someone very new to both equest and with just basic understanding of geothermal systems. I was hoping this community could help.

I am trying to model a proposed geothermal system, however the end annual kWh usage in eQuest comes out to be around 25% of the quoted annual kWh usage from the engineer. What am I missing?
This is a building with 4 HVAC zones, each will be served by a waterfurnace system, and there is a ground loop with 2 pumps. The GSHP specs are directly from the geothermal engineer (below and also attached)
I'm also getting some warnings that I'm not sure how to resolve:
1. for each of the 4 systems, " A HEATING-CAPACITY of   -29600. is inconsistent with a COOLING-CAPACITY of      38400. in SYSTEM EL1 Sys1 (PVVT) (G.SSE1)
Note: I am using the system sizing that the geothermal engineer forwarded
2. WLHP alarm limits


GSHP Plant Equipment
WS 1 of 2
Water Loop Properties
GSHP Loop: Head: 51
 (This is lower, but the lowest equest allows is 51)              Design DT: 10 F (a)
Pump Config: Single Loop Pump(s) only           Loop Pumps-- Number: 2
Loop Flow: Variable                                                   Head/Flow: 23 ft          50gpm
Operation: Demand                  Setpoint: Fixed                  Motor Efficiency: Premium
Loop Temp                       Min: 33F            Max: 75F                           Pump Control: Two Speed

WS 2 of 2
Ground Loop Heat Exchanger Properties
GHX Type: Vertical Well Field            Pipe Size: 1 ½”             Rating: Specify
                                                               Inner: 1.325”                  Outer: 1.9”
Configuration: Line of 4
                                             U-Tube Leg Separation: 1”
Num of Identical Well Fields: 1                          GHX Pipe Head: 30 ft
Depth: 500 ft  Spacing: 20 ft                Fluid Properties:
Borehole Diameter: 6”                                        Fluid: Methanol
Pipe Material: Polyethylene                               Antifreeze Concern: 12%

Soil Thermal Properties and History
All settings left to default
[https://energy-models.com/sites/all/files/imagecache/595/forum_topic_field_image_cache/geotherm_properties.PNG]<https://energy-models.com/sites/all/files/forum_topic_field_image_cache/geotherm_properties.PNG>

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