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Workshop: Opportunities for Wood Heat from Forest Residues
in Alaskan Communities
Alaska Wood Energy ConferenceNovember 16
Fairbanks, Alaska
Tom MilesT.R. Miles Technical Consultants, Inc.
Portland, Oregonwww.trmiles.com
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Purpose• Identify boiler systems that may be
suitable for use in Rural Alaska.• Understand criteria for selecting boiler
systems for Rural Alaska.
Based on Assessments for Juneau Economic Development Council (2006)*
* Feasibility Assessment for Wood Heatingwww.jedc.org/forms/AWEDTG_WoodEnergyFeasibility.pdf
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Assessments
• Community Buildings– Thorne Bay City Hall and Shops– Craig Community Center– Venetie Airport and Washeteria– Craig Aquatic Center and Schools
• Schools– South East Island School District: Naukati and
Coffman Cove– Thorne Bay Community School– Delta Greely Schools
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Main Factors
• Wood Supply• Energy Demand• Suitability of Wood Heat• Investment (Cost/Benefit) of Using Wood• Willingness to Implement Project
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Cordwood and Chips are Abundant
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Alaskan Wood Fuel Properties
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Wood Systems80,000 Btuh-250,000 Btuh• Prefabricated Clean, Efficient Boilers • Alternate Heating Systems • Tarm USA
500,000 -1 MM BtuhBuild to suit, Cordwood or chip• Dectra (Garn), • AHS • Tarm USA• Chiptek
2 million -8 million BtuhIndustrial wood chip systems
•Chiptek•Messersmith •Decton•Biomass Conversion Associates
100-230,000 Btuh
(3-6 BHP) 2-4,000 gpy
2.5 MMBtuh (70 BHP) 40,000 gpy
8 MMBtuh (250 BHP)
400,000 Btuh
8,000 gal oil
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Wood Chip Boilers in Alaska
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Cost of Wood Chip Boilers
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Garn 350,000 Btuh WHS 1500 Ready to Ship
Tarm USA, House in Palmer, AK
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Cost of Cordwood Systems
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Effect of Cordwood Cost on Delivered Heat
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Wood Pellet Boiler
HEARTH AND ASH BIN
TARM 140,000 BTUH
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Fuel Oil Replacement
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Thorne Bay City Hall
1250 gpy
600 gpy
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Thorne Bay Garage + Duplexes
1800 gpy
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Thorne Bay City Buildings
600 gpy
2000 gpy 600 gpy
600 gpy
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Thorne Bay City Buildings
• Clusters of small demand: City Hall, Shop, Water Treatment, Wastewate, Solid Waste
• Suitable for cord wood systems• Low equipment and building cost• Share small shop with High School• Modular systems• Good demonstration site
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Potential Savings at City of Thorne Bay Facilities
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Potential Savings at Maintenance Facilities
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Wood Boiler Costs at Solid Waste Facility
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Thorne Bay Community School
11,500 gpy
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Thorne Bay Community School
• Good demand• Potential for cord wood system• Need low cost modular system• Use part of demand• Share demand with city
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Capital and Non Fuel Costs of Cordwood Boilers: 425,000 Btuh (11,500 gpy)
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Capital and Non Fuel Costs of Cordwood Boilers: 425,000 Btuh (6,000 gpy)
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Total Cost to Replace 11,500 gpy
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Cost to Replace 6,600 gpy Fuel oil
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Cost Estimate for Wood Chip Boilers
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Cost to Replace 11,500 gpy Fuel Oil with Wood Chip Boiler
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Cost to replace 11,500 gpy Fuel Oil with Wood Chip Boiler
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Craig Community Center
6600 gpy
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Craig Community Center
• Small load, low potential savings• Limited space for wood system – parking
lot• DOT prevents use of Aquatic system• No clear labor available• Possible use of wood pellets in future
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Southeast Island School District: Naukati and Coffman Cove
• Naukati– Small school low demand – 8,000 gpy– Best opportunity: waste heat from generator– No area for heating unit– Early in the design phase
• Coffman Cove– Delayed construction– Similar demand – 7,000 gpy– Opportunity for adjacent buildings
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Venetie Airport and Washeteria
CLINIC 1500 gpy
COUNCIL 1500 gpy
TRIBAL OFF 1500 gpy
ELDERS ASSN 600 gpy
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Venetie Community Buildings
• Good demand in airport and washeteria• Demand is for future buildings• Not clear who would provide the wood and
maintain the system
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Savings from Wood at Venetie
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Wood Boiler Costs at Venetie
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Craig Aquatic Center + (2) Schools
22,000gpy
8,000 gpy
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Craig Aquatic Center
• Good demand with pool and two schools• Target part of demand 1 MMBtuh• Minimize capital investment• Solve problem of wet fuel• Center of community: noise and emissions
Acceptable to city maintenance personnel• In construction (2007)
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Delta Greely69,000 gpy
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Delta Greely Schools
• Large demand – several buildings• Possible wood chip system• New school and space• Evaluate further potential• Issues: Location of wood boiler, chip
supply, heat distribution
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Savings from Wood Fuel at Delta Greely Schools
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Impact of Capital and Non fuels Costs: 4.5 MMBtuh Boiler
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Total Cost to Replace 102,000 gpy Fuel Oil
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Challenges
• Small Scale• High Building Costs• High costs for trenching, piping and heat
exchangers
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Recommendations
• Start with Good Examples: Craig, Delta Greely, Thorne Bay School
• Build on success of Dot Lake• Avoid over expectations• Design for low quality fuels• Investigate Lower Cost Alternatives for
Buildings and Heat Distribution
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T R Miles Technical Consultants, Inc.
1470 SW Woodward WayPortland, OR, USA 97225
Tel 503-292-0107Fax-503-292-2919
[email protected] www.trmiles.com