West Chester University

1
West Chester UniversityGeothermal HVAC
SystemComprehensive Plan

• Taken from presentation by
• Neal Babcock
• Howard Alderson, P.E.
• Alderson Engineering, Inc.
• February 26, 2008

2
Closed Vertical Loop

• Typical Installation
• 100 to 150 ft/ton
• 15 x 15 to 20 x 20 spacing
• HDPE Piping

3
Building HVAC Load
4
Campus Block Load
4,600 Tons
6,500 Tons
5
Monthly Geothermal Borefield Heat Gain/Loss
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Thermal Conductivity of Rock Soil

• Underground soil/rock formation strongly affects
  the performance of the well field
• Sands and Clays
• Rock
• Affects type of Grouting used.

7
Pumping

• Primary Loop
• Variable Flow
• Circulates around the Campus
• Secondary Loop 1
• Variable Flow
• Circulates thru Borefield
• Secondary Loop 2
• Variable Flow
• Circulates within a Building

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Geothermal Trench Detail
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Site Distribution Trench Detail
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Site Distribution Connection Detail
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Geothermal Short Building Connection Detail
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Geothermal Tall Building Connection Detail
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Geothermal Flow Diagram
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Materials

• Campus Distribution Loop
• HDPE Pipe 160 PSI Rated
• No Insulation
• Borehole Piping
• HDPE Pipe 160 PSI Rated
• No Insulation
• Isolation Valves
• Butterfly 150 PSI Rated
• Distribution Isolation Valves
• Butterfly/Ball Valves 150 PSI Rated
• Borehole Grout
• Thermally Enhanced Bentonite K1.2