University High School / River Springs Middle School

Hybrid Geothermal

University High School / River Springs Middle School Shared Central Energy

Plant Case Study Panel Discussion

Ryan Strandquest, Matern Engineering

Larry Hood, Volusia County Schools

Randy Proudfit, TRANE

Paul Jones, WW Gay

11.08.2012

Project Team & Panel

Volusia County School Board

2

• Larry Hood, Sr. Construction Manager Specializing in Mechanical Systems for over 40 years Certification in Geothermal from University of Kentucky

WW Gay – Mechanical Contractor

• Paul Jones, Vice President Project Manager of University High School University of Florida – BS in Building Construction

Trane

• Randy Proudfit, Sales Engineer Michigan State University – BS in Mechanical Engineering

HYBRID GEOTHERMAL TECHNOLOGY

Project Facts

Square Footage

3

• University HS – 331,057 SF • River Springs MS – 172,640 SF • 503,697 Total Square Feet

Student Count • University HS – 2,639 • River Springs MS – 1,419 • 4,058 current students

Initial Cost – Central Energy Plant • University HS – $4,928,200 • River Springs MS – $833,800 • $5,762,000 Total CEP Cost


Construction Cost • University HS – $100,000,000 • River Springs MS – $37,000,000 • $137,000,000 Total Cost

Other Team Members • Construction Manager – CPPI • Architect – SchenkelShultz • Wells – Thompson Well Drilling

Geothermal Considerations • Available Ground Water

– Test wells & project location

• Owner Understanding of Unforeseen Conditions – Informed Owner about the risks

• Real Estate – Enough land to spread the supply and injection wells apart

• First Cost – 20-25% additional up front costs could occur

• Project Size – Does the project have enough tonnage to provide a payback

4 HYBRID GEOTHERMAL TECHNOLOGY

Pros & Cons

Pros

• Energy Efficiency – Best performing high school in

Volusia County

• Water Savings – Millions of gallons saved

• Equipment Lifecycle – Equipment lasts longer

• Minor Chemical Treatment – H/X cleaning

• Lower Site Acoustics – Noise pollution reduction

Cons

• First Cost • Unforeseen Site Conditions • Specialized Maintenance

per Site • Permitting Challenge

HYBRID GEOTHERMAL TECHNOLOGY 5

Aerial Photo


B

C

App. 10,000 Linear Feet of CHS/R Piping

University High School Site Plan


SJWMD Test Well

Piping Scheme


Hydronic HVAC Systems

9

Chillers • Three-600 ton Centrifugal compression

chillers designed to handle constant condenser water

• One-325 ton Screw compressor chiller for low loads


Waterside • Three-75 HP Geothermal loop pumps

totaling 7200 GPM (1 stand-by) • Three-125 HP chilled water distribution

loop pumps totaling 5,500 GPM (1 stand-by)

Hydronic HVAC Systems


Heat Exchangers

• Two-2400 GPM plate and frame heat exchangers.

• 32,400,000 BTU/H exchange rate

• 600 Stainless Steel Plates

Package Pumping Systems • Fully integrated variable

primary pumping system for geothermal and chilled water distribution

• Controls were integrated into package prior to delivery

Geothermal Well Systems

Number / Depth • Four-1,200 GPM supply wells, utilizing

vertical turbine well pumps • Five-Injection wells with variable flow in

each of the wells – Four active and the fifth is used as a

SJWMD test well

11

Filtration • Original: Dirt & debris separator & basket

strainers • Additional: Centrifugal separator @ the

wells • Final: Disc filtration system single pass @

4800 GPM


Geothermal Well Systems

Issues • Filtration and reviewing the Micron level

of filtration per pass. • Cross flow between supply and injection

wells (GWP-1 had 3 degree rise) • Vortex vacuum on the injection wells • Bio-film build up

12

SJWMD Permit • Consumptive use permit required • Test well for SJWMD was required • Defined separation between chillers and

ground water injection (option) • Hydrologist full report and analysis

required


Well Video


Cost Analysis


University HS Comparison

Deltona HS – 2005 Total CEP Cost - $3,800,00.00 264,674 SF = $14.36 SF 1425 Tons = $2,666.67/Ton

University HS – 2009 Total CEP Cost - $4,928,200.00 331,057 SF = $14.89 SF 1525 Tons = $3,231.61/Ton

A

B

Cost Comparisons


100%

Water Cooled Chillers with Geothermal Condenser Water 1525 Ton for the HS – Three Chillers 2125 Total Tons – Four Chillers 331,057SF

University High School

96%

68%

Three - Water Cooled Chillers with Cooling Towers 1425 Total Tons 4% Less*

Deltona High School

Three - Air Cooled Chillers 1020 Total Tons 32% Less*

*SF Extrapolated to Match University High School

Mainland High School

Combined CEP Comparison


100%

122%

Combined CEP 2125 tons $5,762,000 Total Cost $11.44/SF $2,711.53 $/Ton

University HS & River Springs MS

Combined CEP 2025 Tons $7,184,757.00 Total Cost $14.27/SF $3,548.03 $/Ton

Deltona HS & Creekside MS

CEP Power Consumption


.92 KW/Ton

1.26 KW/Ton

1.41 KW/Ton

Water cooled chillers with geothermal & swing

chiller

Water cooled chillers with cooling towers &

swing chiller

Air cooled chillers & swing chiller

University HS Deltona HS Mainland HS

20-Year Life Cycle Cost Analysis


Baseline $0

$13,405 More

Monthly

$16,191 More

Monthly

Baseline Geothermal $3,217,302 Total 20-Year Life Cycle Cost Analysis Addition

$1,485,721 Total 20-Year Life Cycle Cost Analysis Addition

University HS Geothermal

University HS Chiller Plant – Water Cooled

University HS Water Cooled Chiller Plant –

Thermal Storage

20-Year Life Cycle Cost Analysis

PLANT INFORMATION 2009 PLANT CAPITAL COST COMPARISONS

Chilled Water Plant w/ Cooling Towers Chilled Water Plant with Thermal Ice Storage & C.T. Geothermal Plant

Plant Price w/ Change Orders (Entire Plant) $3,926,000 $4,385,600 $4,928,200

Peak Energy Cost per Year (Entire Plant) $585,623 $479,658 $412,518

Total Energy Cost for Life Cycle of Plant $11,712,460 $9,593,160 $8,250,360

Effective Life Cycle Cost of the Plant (Based on a 20 year life cycle with no escalation)

$15,638,460 $13,978,760 $13,178,560

Effective Comparative Life Cycle Cost Savings (Based on a 20 year life cycle with no escalation)

$2,459,900 $800,200 $0

Effective Annual Electrical Cost Savings $122,995 $40,010 -

Effective Monthly Electrical Cost Savings $10,250 $3,334 -

Effective Monthly Cost including Water Consumption Savings $13,405 $6,191 -

Effective Comparative Life Cycle Cost Savings including Water Consumption (Based on a 20 year life cycle with no escalation)

$3,217,302 $1,485,721 -


20-Year LCCA Water Savings

20

0

40 80 120

160

200

University w/ Cooling Towers

157,464,000 Gallons

0

40 80 120

160

200

University w/ Cooling Towers & Thermal Storage

142,520,000 Gallons

0

40 80 120

160

200

University Geothermal

240,000 Gallons

B A C


In Millions of Gallons

Water Savings

Water Bill Analysis Water Bill Analysis Based on 180 Day School Year

Chilled Water Plant w/ Cooling Towers Chilled Water Plant with Thermal Ice Storage & C.T. Geothermal Plant

Annual Water Consumption per Scheme (Gallons) 7,873,200 7,126,000 12,000

Monthly Water Consumption per Scheme (Gallons) 656,100 593,833 1,000

Monthly Water Consumption Cost (CEP Only) $3,155.84 $2,856.34 $1.60 Annual Water Consumption Cost (CEP Only) $37,870.09 $34,276.06 $19.20 20-Year Life Cycle Water Consumption Cost (CEP Only with No Escalation) $757,401.84 $685,521.20 $384.00 20-Year Life Cycle Water Consumption (CEP Only - Gallons) 157,464,000.00 142,520,000.00 240,000.00



$ 26,088.00 Chillers $ 65,775.00 Co2 demand ventilation $ 17,817.45 Occupancy sensors $ 999.00 Motors $ 2,744.84 Lighting $ 4,990.44 Roofing System $ 117,415.73 Total rebates

Owner’s Perspective


Summary & Conclusion

• Hybrid Geothermal cooling is not for every project – Careful evaluation of the considerations is required

• Design needs to be thought through on all levels • The first cost for geothermal is comparable

– ROI is less on higher tonnages

• Hybrid Geothermal cooling saves energy and water • Design is a collaborative effort with the Owner and

all vested parties – Everyone needs to be aware of the “Risk/Reward”


QUESTIONS? Panel Discussion -


Thank you!

Ryan Strandquest, Matern Engineering

Larry Hood, Volusia County Schools

Randy Proudfit, TRANE

Paul Jones, WW Gay

Documents

University High School / River Springs Middle School