Download - Steam Generation from Solar Trough Energy
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Steam Generation from Solar Trough Energy
The New Red B
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Presentation Outline
Customer and Team Goals Recap Our Steam Generator Alternative, rejected ideas Anticipated Challenges Mock-up Results Future Challenges
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Customer
Matt S. Orosz (MIT G, Engineering Systems)
Working with Bethel Business and Community Development Center in Lesotho (southern Africa) to enable parabolic trough applications
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Our Goal – Create More Applications for Parabolic Trough
Electricity Micro Hydro Power – hammer mills, power
tools Heating water Devices for clinics and schools
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Our Steam Generator
Use Apricus solar absorption tube to produce steam within boiler
Water boiler designed to connect to interchangeable devices
Concentration: SterilizationBorosilicate Glass
Copper NubHeat Absorption Coating
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Alternatives Considered-Steam Engine
Financially feasible Not enough solar energy to power a 1 hp
engine• Closed loop efficiency ~5%• Open loop efficiency ~2%
Integrating system components (pumps, condensers) also not feasible for this class
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Alternatives Considered – Sterling Engine
Simpler principle than steam engine Not financially feasible
Low HP engines > $35,000
Technology not yet available (2005?) Still in R&D phase
Maximum efficiency ~ 10%, still not enough output
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Anticipated Challenges
Heat Transfer, how? From nub to water to generating steam
Pressurized Steam - ASME Codes Tube Safety
Max operating temperature of 250°C Fragile Casing – Borosilicate glass
Maximum Strength 0.8 MPa
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Our Mock-Up
Water is working fluid (20 oz)
“Solar” source: 250W heat lamps (4)
Gravity fed Nub conducts heat to
water until it reaches boiling temperature
Nucleate boiling
Boiler not pictured.
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Knowledge from Mockup and Calculations
Boiler is currently heating water Time to initially reach boiling significant
Not using solar reflector, means less heat absorption
Using less than 1/20 of actual energy
Predict it will not film boil
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Challenges Still to be Resolved
Experimentally confirm will not film boil at maximum anticipated solar heat flux
Make sterilizer from pressure cooker Pressurization of system to 45 psi (135°C) to run
for cooker