parabolic trough developments for concentrating solar ...parabolic trough developments for...
TRANSCRIPT
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FORUM 2001 FORUM 2001
Parabolic Trough Developments for Concentrating Solar Power Markets
ESTABLISHING NEW BOUNDARIES
Ken MayPresidentIndustrial Solar Technology Corporation
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IST innovation has produced IST innovation has produced major cost reductionsmajor cost reductions
Figure 5: IST-PC System Costs
0
200
400
600
800
1000
1200
1400
1600
1980 1985 1990 1995 2000Year of Installation
Tota
l Ins
talle
d C
ost,
$/m
2 ($
2001
)
DOE Program5,000
220
550
2700 1700700
10,000
Collector Area m2
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California California
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ArizonaArizona
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Status of US Trough IndustryStatus of US Trough Industry� IST is the only US company currently involved
in the manufacture and installation of PTC’s� Only US company to have installed PTC systems
since ~1984� Only US company that has exported PTC
systems in recent years� If not for IST, the US trough industry could have
“died” and tax-payer funded R&D efforts lost
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Next Phase of IST Product Next Phase of IST Product ImprovementImprovement
� Increased Production
� New Technology-USA Trough NREL/IST cost-shared development program-Phase II Developments
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Increased Production through Increased Production through Diversified MarketsDiversified Markets
� Utility Power MarketsSEECOTTM
CT inlet air coolingCT Steam Injection
ISCCS� Remote Power Markets--ORC� Process Heat Markets
Hot WaterSteam
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USA Trough :USA Trough : Addressing Limitations Addressing Limitations of Current Technologyof Current Technology
� Durability of plastic films� Reduced reflectance of films� Temperature limit of blackened nickel
selective surface� Obsolesce of system controller� Cost
Concentrator ~50% of system cost
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Elements of Development Elements of Development Program Program
• Glass/steel concentrator• Higher temperature and lower emittance
blackened nickel selective surface• System controller
• IST scopeComplete re-evaluation of system components: concentrator, supports, drive, receiver
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Concentrator MaterialConcentrator MaterialAluminum SteelAluminum Steel� Lightweight concentrator
5.4 kg/m2 � Corrosion resistant� Easy to work� Smooth surface for
reflective films� Advantages for low
production rates� Can use polished
aluminum reflector
� 17 kg/m2� Low cost� Stronger� More rigid� Easier, stronger
welds� Compatible with
glass� Reduced shading� Longer Rows
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Reflector MaterialReflector MaterialAluminized Film Silvered GlassAluminized Film Silvered Glass� Low cost� Easy to apply� Unbreakable
� Higher reflectance� Longer life� Compatible with
steel substrate� Scratch resistant
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Concentrator SubConcentrator Sub--TasksTasks
� Design and system evaluationComplete
� Procurement of materialsComplete
� Fabrication of test modulesCompletion in two weeks
� Structural testingIn preparation
� Deployment and field evaluation
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Results so farResults so far
� Glass mirror supplier working to improve product; testing by NREL and IST
� Design process has revealed many opportunities for cost reduction and performance enhancement
� Phase II: Increased aperture trough using IST structural concept
No apparent technical limitations
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Thermal Efficiency: Thermal Efficiency: Sandia DataSandia Data
Thermal Efficiency of IST-PC and LS-2
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80
0 50 100 150 200 250 300 350
Collector Temperature above Ambient, C
Ther
mal
Effi
cien
cy, % LS-2
IST-PC
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Needed Improvements of Needed Improvements of AbsorberAbsorber
� Higher temperature rating� Lower emittance at elevated temperature
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Improvement TechniquesImprovement Techniques
� Lower emittance substrateStainless steelPolished: mechanical or electropolished
� Higher temperature capabilitySol-gel barrier coat
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Improved Absorber SubImproved Absorber Sub--Tasks: Tasks: Joint IST/Sandia/NREL ProjectJoint IST/Sandia/NREL Project� Experimental matrix: Sandia/IST
Complete� Substrate preparation: Sandia� Application of blackened nickel selective
surface: IST awaiting samples� Application of barrier coat: Sandia� Measurement and evaluation:
Sandia/IST/NREL
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New System Controller New System Controller FeaturesFeatures
� Enhanced computational capabilities� Improved tracking accuracy� Position indication� Data acquisition, communication and
remote control functions� Improved reliability for unattended
operations
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TasksTasks� Design system logic
Complete� Write controller software
Ready for evaluation� Fabricate hardware interfaces
Underway� Field evaluation
Starting within ~one month� Test and Debug
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ISTIST--RMT (Roof Mounted Trough) RMT (Roof Mounted Trough) Initial Controller Test BedInitial Controller Test Bed
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SummarySummary� Project progressing rapidly� Prospects for significant cost improvement and
performance increase� Potential for short-term market deployment in
US with significant opportunity for exports� Maintaining US leadership in PTC technology� Entry to Phase II: Installation goal ~$100/m2