group 17 oceanic thermal energy conversion model - lockheed martin 1 oceanic thermal energy...
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Group 17 Oceanic Thermal Energy ConverGroup 17 Oceanic Thermal Energy Conversion Model - Lockheed Martinsion Model - Lockheed Martin
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Oceanic Thermal Energy Oceanic Thermal Energy ConversionsConversions
Group Members:Group Members:Brooks CollinsBrooks Collins
Kirby LittleKirby LittleChris PetysChris PetysCraig TestaCraig Testa
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Presentation OverviewPresentation OverviewI. IntroductionWhat is OTEC
Problem DescriptionR-410a Overview
II. Design & AnalysisDesign RequirementsEvolution of Design
R-410a Rankine Cycle DescriptionComponent Summary & Description
III. Testing and ResultsCirculation System
Ideal Rankine Cycle ResultsRankine Cycle System
IV. Conclusion
Group 17 Oceanic Thermal Energy ConverGroup 17 Oceanic Thermal Energy Conversion Model - Lockheed Martinsion Model - Lockheed Martin
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Problem Statement of ProjectProblem Statement of Project
• To create and design an operating To create and design an operating Oceanic Thermal Energy Conversion Oceanic Thermal Energy Conversion model that employs a closed Rankine model that employs a closed Rankine Cycle that utilizes R-410 A as the working Cycle that utilizes R-410 A as the working fluid to illustrate the viability of OTEC fluid to illustrate the viability of OTEC power production.power production.
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OTEC Description Oceanic Thermal Energy
Conversion OTEC utilizes the ocean’s
20ºC natural thermal gradient between the warm surface water and the cold deep sea water to drive a Rankine Cycle
OTEC utilizes the world’s largest solar radiation collector - the ocean. The ocean contains enough energy power all of the world’s electrical needs.
Group 17 Oceanic Thermal Energy ConverGroup 17 Oceanic Thermal Energy Conversion Model - Lockheed Martinsion Model - Lockheed Martin
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Design Specifications
Our model OTEC plant should produce 100 W of power (approximate amount to power a laptop computer)
Dimensions cannot exceed 3 ft. deep x 8 ft. wide x 6 ft. tall
Must be easily portable The model should be aesthetically
pleasing as well as well organized so that individuals will be able to fully understand the inner-workings of the Rankine Cycle that powers the OTEC plant.
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1. Power input to pressurize R-410a to higher pressure
3. Power output from turbine as the vapor isentropically expands through turbine
4. Heat extraction from cold-water sink to condense the working fluid in the condenser.
Cycle begins again
2. Heat addition from the hot-water source to evaporate the working fluid within the heat exchanger
OTEC Model Diagram
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R-410a Overview
R-410a and R-22 have very similar properties, but R-410a is a non-ozone depleting refrigerant
R-22 is being phased out across the globe due to the fact that is an ozone depleting refrigerant.
Every major air conditioning manufacturer in the U.S. has selected R-410a as the replacement to R-22 in all their new equipment.
Group 17 Oceanic Thermal Energy ConverGroup 17 Oceanic Thermal Energy Conversion Model - Lockheed Martinsion Model - Lockheed Martin
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R410-a P-h Diagram Rankine Cycle
Group 17 Oceanic Thermal Energy ConverGroup 17 Oceanic Thermal Energy Conversion Model - Lockheed Martinsion Model - Lockheed Martin
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Evolution of Model Designs
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Analysis and Part Selection
Our analysis led us to the specs needed for part selection based on our theoretical Rankine Cycle
Calculations included heat transfer through heat exchangers, piping losses, pump sizing, and turbine power expectations
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Key Part Summary – Working Fluid Pump
Hypro Piston Pump Maximum rating of
2.20 GPM and 500 psi Input power provided
by a ¾ HP electric motor
Due to the pump ratings exceeding the specs of our system we were forced to throttle the fluid down to the appropriate pressure and flow rate
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Key Part Summary – Heat Exchangers
Alfa Laval Brazed Plate Type Heat Exchangers
4.27/6.22” x 4.37” x 20.71”
Both condenser and evaporator are same design of heat exchanger with slightly different dimensions
Group 17 Oceanic Thermal Energy ConverGroup 17 Oceanic Thermal Energy Conversion Model - Lockheed Martinsion Model - Lockheed Martin
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Key Part Summary - Turbine
Utilized the turbine side of an automotive turbocharger to produce our power output
Compressor wheel and housing were intended to be removed so that we could connect the output shaft to a generator
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Finalized System
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Testing and Results – Circulation Systems
Both circulation systems are functioning.
Flow rates from both pumps were measured at approximately 720 GPH
This is slightly less than calculated, but the pumps need to run continually for five hours before they are able to produce their maximum flow rates.
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Ideal Rankine Cycle Results Working fluid pump requires .57 HP to
produce 2.10 GPM 300 psi. Based on our ideal calculations, this would
ideally produce 2600W of power to the turbine.
This gives our system an ideal back work ratio (ratio between work input to the pump and work output from the turbine) of .163
Ideal efficiency of our system would be 7.3%
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Testing & Results – Rankine Cycle
Based on our instrumentation (temperature gauges after both heat exchangers and pressure gauges after the pump, throttling valve, and turbine) we planned to match our system to the theoretical Rankine Cycle.
Due to our inability to find leakages within our system we were unable to test and compare our cycle to the theoretical cycle described earlier.
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Conclusion Our system is well organized and
illustrates the working components of an OTEC system.
Our system sets the ground work for a miniature OTEC model, and could be made working with minimal changes.
Improvements could be made by changing to a smaller working fluid pump to decrease the work input to the system.
With the present components, our system greatly exceeds the necessary power input and output.
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Group 17 WebpageGroup 17 Webpage
http://www.eng.fsu.edu/ME_senior_design/2008/team17/Index.html
Group 17 Oceanic Thermal Energy ConverGroup 17 Oceanic Thermal Energy Conversion Model - Lockheed Martinsion Model - Lockheed Martin
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Questions & Comments?Questions & Comments?