Optimizing Heat Recovery Systems for Power Generation in Rural - - PowerPoint PPT Presentation
Optimizing Heat Recovery Systems for Power Generation in Rural Alaska Tanana Chiefs Conference and Alaska Center for Energy and Power Dr. Chuen-sen Lin Ross Coen September 28, 2009 Chena Hot Springs Project Summary Power
Power generation through
use of an Organic Rankine Cycle (ORC) unit with heat recovery from diesel generator.
Laboratory and field tests. Preferred vendor:
ElectraTherm.
To achieve ORC efficiency of 10% and
corresponding fuel efficiency by ~3%.
Reduced fuel consumption. Lower costs. Reduced greenhouse gas emissions.
To achieve ORC efficiency of 10% and
corresponding fuel efficiency by ~3%.
Reduced fuel consumption. Lower costs. Reduced greenhouse gas emissions.
To evaluate feasibility, operation / maintenance
requirements, and economic impact.
To achieve ORC efficiency of 10% and
corresponding fuel efficiency by ~3%.
Reduced fuel consumption. Lower costs. Reduced greenhouse gas emissions.
To evaluate feasibility, operation / maintenance
requirements, and economic impact.
To develop guidelines for ORC application,
particularly in rural Alaska.
~ 650 people 270 air miles west of Fairbanks Transportation, economic, and
government hub of Yukon- Koyukuk sub-region
Supply access by barge (river
ice-free from mid-May to mid- October); regular air access year-round
City Power Plant Fuel consumption (2007) =
574,000 gallons diesel
Total fuel cost (574,000gal x
$6.50) = $3.73 million
Total electric costs (fuel + non-
fuel) = $4.69 million
Average load = 501 kW Peak load = 1000 kW
ORC efficiency improvement (%)
10 9 5
ORC fuel efficiency improvement (kW-hr/gal) 1.6675 1.50075 0.83375 Net fuel efficiency (kW- hr/gal) 16.1675 16.00075 15.33375 Gal fuel per 1000 kW-hr 61.8525 62.4971 65.2156 Cost per 1000 kW-hr (at $6.50/gal) $402.04 $406.23 $423.90 Starting engine fuel efficiency (kw-hr/gal) 14.5 14.5 14.5 Gal fuel per 1000 kW-hr 68.9655 68.9655 68.9655 Cost per 1000 kW-hr (at $6.50/gal) $448.28 $448.28 $448.28
Cost savings $46.24 $42.05 $24.38
In 2007, the approximate electric production in Galena was 4,387,284 kW-hr.
ORC efficiency improvement (%)
10 9 5
Cost savings per 1000 kW-hr/gal
$46.24 $42.05 $24.38 Potential annual savings with ORC $202,868 $184,485 $106,961
Cost of ORC unit = $128,000 Fuel efficiency = 14 kW-hr/gal, Operation = 24 hr/day
Electric power generation in rural Alaska in 2007 = 375,000 MW-hr Fuel consumption = 26 million gallons With ORC operating at 10% efficiency, total potential savings in 2007 = $17,340,000 With ORC in every village over 20 years = $346,800,000
Power capacity: Less than 100 kW Development status: R&D and prototype (pre-
commercial)
Efficiency of prototypes:
7% from jacket coolant / exhaust gas recirculation 12.5% from jacket coolant / exhaust of long-haul truck 9% from hot coolant
ORC technology is currently being used in large-
scale and industrial applications around the world…however…
Few data exist on small-scale applications,
especially in Alaska’s unique environmental and climatic conditions.
There is a need for laboratory / field
performance data for optimal application and design improvement.
insight on small- to mid- scale ORC applications.
insight on small- to mid- scale ORC applications.
consumption and greenhouse gas emissions.
insight on small- to mid- scale ORC applications.
consumption and greenhouse gas emissions.
villages in rural Alaska.