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Copyright ©Ennex Developments (Pty) Ltd. 2011
INTRODUCTION TO DISH STIRLING CSP TECHNOLOGY
SOLAR SOUTH AFRICA21 June 2011
Copyright ©Ennex Developments (Pty) Ltd. 2011
Main CSP Technologies
2
Parabolic Trough Linear Fresnel Reflectors
Solar Tower Dish Stirling
Copyright ©Ennex Developments (Pty) Ltd. 2011
Efficiency of Different CSP Systems
3
14.5
11
15.5
21.5
0
5
10
15
20
25
ParabolicTrough
Linear Frisnel Solar Tower Dish Stirling
Average efficiencies (%)
©FC Business Intelligence
Copyright ©Ennex Developments (Pty) Ltd. 2011
Planned CSP Capacity per Technology
4
9226.9
2901
536
2334
0
2000
4000
6000
8000
10000
ParabolicTrough
Solar Tower Linear Frisnel Dish Stirling
Planned CSP Capacity per Technology (MW)
©FC Business Intelligence
Copyright ©Ennex Developments (Pty) Ltd. 2011
Planned/Installed Capacity Ratio per Technology
5
10.676.3 51.5
1222.0
0
200
400
600
800
1000
1200
1400
ParabolicTrough
Solar Tower Linear Frisnel Dish Stirling
Planned/Installed Capacity Ratio per Technology (MW)
©FC Business Intelligence
Copyright ©Ennex Developments (Pty) Ltd. 2011
• Smaller land requirement due to higher efficiencies (2.5 Ha/MW).• Modularity enables uniquely scalable power sizes.• Economy through mass production rather than economy of scale.• Short construction times – 10 months, 20 MW.• High localization and job creation potential.• No water needed for cooling.• No need for flat terrain – can be installed on rolling terrain.• Low maintenance and operating costs.• Flexible and simple installation using low skilled labour.• More stable output than PV.• Dual‐axis tracking, which results in high capacity factor (± 32%).
Advantages of Dish Stirling Technology
6
All these translate into very attractive economics
Copyright ©Ennex Developments (Pty) Ltd. 2011
Description of a Dish Stirling System
7
Stirling EngineParabolic Reflector
Dual‐axial Drive
Electronics
Chassis
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Two Types of Stirling Engines
8
Kinematic Free‐Piston
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Infinia’s FPSE Stirling Engine
• Mature– NASA, DOE, DOD– Bosch, Rinnai, Merloni, Enatec– Over million operating hours
• Robust– No life‐limiting components– 25 year service life
• Zero Maintenance– Helium working fluid– Sealed unit– No lubricants
Solar Radiation
Cold
Electrical Output
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Heat Drive: 3 kW free‐piston Stirlingengine with a dry cooling system
Reflector
AC Power Out
3 kW peak at 850 W/m2
24% net efficiency
Two‐axis tracking
Zero‐alignment optics
Closed‐loop cooling system
Remote/unattended operation
Fully certified and grid‐safe
No water for cooling
Bi‐axial Drive Unit
Copyright ©Ennex Developments (Pty) Ltd. 201111
Commercial Units – Casa Grande, Arizona
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Pilot Units ‐ Sandia, NM ‐ September ‘09
12
Copyright ©Ennex Developments (Pty) Ltd. 2011 13
30 Pilot Units– Spain‐ since May ‘09
Copyright ©Ennex Developments (Pty) Ltd. 2011
Commercial Units: Yuma, AZ– June‘10
14
Copyright ©Ennex Developments (Pty) Ltd. 2011
Designed With Installation in Mind
Copyright ©Ennex Developments (Pty) Ltd. 2011
Heat Drive
Drive
Reflector
Chassis
Electronics
Kit Delivery
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Ease of Installation
• Materials Delivered to Site• Packaged for Ease of Handling
©Infinia Corporation
Copyright ©Ennex Developments (Pty) Ltd. 2011
• Basic Hand Tools• No Special Skills Required• 8 Man Hours Targeted for Unit Assembly
Ease of Installation
©Infinia Corporation
Copyright ©Ennex Developments (Pty) Ltd. 2011
Ease of Installation• Assembled at Ground Level
©Infinia Corporation
Ease of Installation• No Mirror Adjustment
©Infinia Corporation
Copyright ©Ennex Developments (Pty) Ltd. 2011
Ease of Installation• Simple Mounting• Minimal Connections
©Infinia Corporation
Copyright ©Ennex Developments (Pty) Ltd. 2011
• 82MW under contract– Europe (Spain)– India– USA
• 400MW under MOU– China– Europe– USA
• 1.5GW indicative interest
Infinia’s Sales Pipeline
22
Copyright ©Ennex Developments (Pty) Ltd. 2011
• US ExIm Bank has thoroughly evaluated the PowerDishtechnology and has given tacit approval to fund all PowerDishprojects.
• ExIm Bank funds about 75% of total project cost.• Repayment Term: 18+ years.• Standard minimum interest rate: 4.71 %.• Small risk to investors, NO risk to SA Government.
Financing
23
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• Affordable• Flexible• Scalable• Modular• Reliable• Available
Conclusion
24
Dish Stirling: A solution to large or small‐scale CSP which is:
Copyright ©Ennex Developments (Pty) Ltd. 201125
Contact information
Dr. Gideon GreyvensteinDirector
Ennex Developments (Pty) Ltd.PO Box 66004, Highveld Park, 0169
South AfricaTel: +27 82 5583917Fax:+27 12 349 8425
email: [email protected]
www.ennex.co.za