14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176
Phone: 703 737 0400 116 N Edwards Ferry Road, NE
Leesburg, VA 20176 Phone: 703 737 0400
SUSTAINABLE LOUDOUN
SUSTAINABLE LOUDOUN
ENERGY SUMMIT
ENERGY SUMMIT
Presenter: Bruce E. Beddow, PE
Writer: Reto von Euw
DESIGN FOR A
DESIGN FOR A
RENEWABLE ENERGY SYSTEM
14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176
Phone: 703 737 0400
Design for a Renewable Energy System
Table of Contents:
Table of Contents:
• Sustainability Study: ARCHITECTURE
• Sustainability Study: HVAC
• Approved Solution: SOLAR – GROUND SOURCE
• SOLAR COLLECTOR PANELS
• Heat pump with GROUND SOURCE
• Comparison of
14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176
Phone: 703 737 0400
Minnie Howard School, Alexandria
SUSTAINABILITY STUDY:
SUSTAINABILITY STUDY:
ARCHITECTURE
ARCHITECTURE
HVAC / PLUMBING / ELECTRICAL
HVAC / PLUMBING / ELECTRICAL
LEED EB
14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176
Phone: 703 737 0400
Minnie Howard School, Alexandria
SUSTAINABILITY STUDY:
SUSTAINABILITY STUDY:
ARCHITECTURE
ARCHITECTURE
14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176
Phone: 703 737 0400
Minnie Howard School, Alexandria
SUSTAINABILITY STUDY:
SUSTAINABILITY STUDY:
ARCHITECTURE
ARCHITECTURE
14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176
Phone: 703 737 0400
Minnie Howard School, Alexandria
SUSTAINABILITY STUDY:
SUSTAINABILITY STUDY:
ARCHITECTURE
ARCHITECTURE
14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176
Phone: 703 737 0400
Minnie Howard School, Alexandria
SUSTAINABILITY STUDY:
SUSTAINABILITY STUDY:
ARCHITECTURE
ARCHITECTURE
14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176
Phone: 703 737 0400
Minnie Howard School, Alexandria
SUSTAINABILITY STUDY:
SUSTAINABILITY STUDY:
ARCHITECTURE
ARCHITECTURE
14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176
Phone: 703 737 0400
Minnie Howard School, Alexandria
SUSTAINABILITY STUDY:
SUSTAINABILITY STUDY:
HVAC
HVAC
14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176
Phone: 703 737 0400
Minnie Howard School, Alexandria
SUSTAINABILITY STUDY:
SUSTAINABILITY STUDY:
HVAC
HVAC
HEAT PUMP
HEAT PUMP
SOURCE: AIR
SOURCE: AIR
COP: 2.5 – 3.0
SOURCE: WATER
SOURCE: WATER
COP: 3.0 – 5.0
LEED EB
14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176
Phone: 703 737 0400
Minnie Howard School, Alexandria
SUSTAINABILITY STUDY:
SUSTAINABILITY STUDY:
HVAC
HVAC
SOURCE: EARTH
SOURCE: EARTH
-
-
COUPLED
COUPLED
COP: 4.0 – 7.0
HEAT PUMP
HEAT PUMP
14-Nov-2008
Minnie Howard School, Alexandria
SUSTAINABILITY STUDY:
SUSTAINABILITY STUDY:
HVAC
HVAC
SOLAR COLLECTOR PANEL
SOLAR COLLECTOR PANEL
FLAT-PLATE COLLECTOR
- Residential and Commercial
- Temperature below 200°F
EVACUATED-TUBE COLLECTOR
- Temperature higher than 200°F
DIRECT SOLAR ENERGY
DIRECT SOLAR ENERGY
14-Nov-2008
Minnie Howard School, Alexandria
HEAT PUMP
HEAT PUMP
-
-GROUND SOURCE
GROUND SOURCE
SOLAR
SOLAR
COLLECTOR
COLLECTOR
PANELS
PANELS
GAS
GAS
BOILER
BOILER
DHW
DHW
APPROVED SOLUTION:
APPROVED SOLUTION:
SOLAR
SOLAR
–
–
GROUND SOURCE
GROUND SOURCE
HEATING and COOLING
HEATING and COOLING
14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176
Phone: 703 737 0400
Minnie Howard School, Alexandria
SOLAR COLLECTOR PANELS
SOLAR COLLECTOR PANELS
GEOTHERMAL FIELD
GEOTHERMAL FIELD
APPROVED SOLUTION:
APPROVED SOLUTION:
SOLAR
SOLAR
–
–
GROUND SOURCE
GROUND SOURCE
14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176
Phone: 703 737 0400
Smart Soutions
SOLAR COLLECTOR PANELS
SOLAR COLLECTOR PANELS
- 42 Collector Panels
14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176
Phone: 703 737 0400
Energy Flow Diagram
APPROVED SOLUTION:
APPROVED SOLUTION:
SOLAR
SOLAR
–
–
GROUND SOURCE
GROUND SOURCE
SOLAR COLLECTOR PANELS
SOLAR COLLECTOR PANELS
14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176
Phone: 703 737 0400
Smart Soutions
SOLAR COLLECTOR PANELS
SOLAR COLLECTOR PANELS
- 42 Collector Panels
- 1,700 sqft Collector Area
GEOTHERMAL FIELD
GEOTHERMAL FIELD
- 62 Wells
- 300 ft deep
14-Nov-2008
Minnie Howard School, Alexandria
GEOTHERMAL FIELD
GEOTHERMAL FIELD
- 62 Wells
- 300 ft deep
APPROVED SOLUTION:
APPROVED SOLUTION:
SOLAR
SOLAR
–
–
GROUND SOURCE
GROUND SOURCE
RAUGEO
RAUGEO
TMTM; DOUBLE U
; DOUBLE U
-
-
BEND
BEND
- Less boreholes
- If one UBEND is compromised, the entire
borehole is not lost
- Reduces borehole resistivity
14-Nov-2008
Minnie Howard School, Alexandria
GEOTHERMAL FIELD
GEOTHERMAL FIELD
- 62 Wells
- 300 ft deep
APPROVED SOLUTION:
APPROVED SOLUTION:
SOLAR
SOLAR
–
–
GROUND SOURCE
GROUND SOURCE
PIPE PEX
PIPE PEX
-
-
a
a
- PEX-a pipe has superior material
properties vs. HDPE
- resistance to crack growth
14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176
Phone: 703 737 0400
Minnie Howard School, Alexandria
APPROVED SOLUTION:
APPROVED SOLUTION:
SOLAR
SOLAR
–
–
GROUND SOURCE
GROUND SOURCE
14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176
Phone: 703 737 0400
Energy Flow Diagram / HEATING
CONVENTIONAL
CONVENTIONAL
SOLAR
SOLAR
–
–
GROUND SOURCE
GROUND SOURCE
14-Nov-2008
+4%
-66%
SAVINGS
26%
12%
SOLAR – GROUND SOURCE
22%
78%
CONVENTIONAL
ELECTRICITY
GAS
116 N Edwards Ferry Road, NE Leesburg, VA 20176 Phone: 703 737 0400
COMPARISON
COMPARISON
Energy Flow
INPUT
INPUT
LEED EB
14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176 Phone: 703 737 0400
SUMMARY
SUMMARY
Energy Flow
CONVENTIONAL SOLUTION:
CONVENTIONAL SOLUTION:
- needs 2.7 x more NON-RENEWABLE ENERGY
SOLAR
SOLAR
–
–
GROUND SOURCE
GROUND SOURCE
- PAYBACK ~8 years (LIFETIME from WELL FIELD is 50+ years)
- Life cycle COST SAVINGS $430,000 over 20 years (in PV 2008 Dollars)
- Reduction of GREENHOUSE GASES 50,000 kg CO
2per year
14-Nov-2008
116 N Edwards Ferry Road, NE Leesburg, VA 20176
Phone: 703 737 0400
