solar energy collection
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Solar Energy CollectionMSD 8404 01/11/08
Solar Pasteurizer
Solar Energy
Water
Collect Solar Energy
Convert to Heat
Transfer Heat to Water
Store Input Water
Receive Heat
PasteurizeHeat Back
into System
Output Pasteurized
Water
Functional Diagram for P0804 Solar Pasteurizer
Identified Sub-Systems
Pasteurize
Heat Back into System
Collect Solar Energy
Store Input Water
Convert to Heat
Flow Control
Heat Transfer
Transfer Heat to Water
Receive Heat
Solar Collector
Heat Recovery
Solar Collector Concepts
• “Flat Plate” Collectors– First Gen Type– Various Serpentine Patterns– Coiled Tube
• Evacuated Tube Collector• Parabolic Mirror and Pipe
Flat Plate Collectors
Evacuated Tube Collectors
Parabolic Mirror Collection
Collector Concept Selection Matrix
Collector ConceptsA B C D
(reference)
Segment First Gen Serpentine Flat Plate Black Coil Evac Tube
Selection Criteria Weight Rating Notes Wtd Rating Notes Wtd Rating Notes Wtd Rating Notes Wtd
Thermal Efficiency 30% 3 - 0.90 4 - 1.20 2 - 0.60 5 - 1.50
Material Cost 50% 3 - 1.50 3 - 1.50 5 - 2.50 2 - 1.00
Safety 10% 5 - 0.50 5 - 0.50 5 - 0.50 3 - 0.30
Maintenance 10% 4 - 0.40 3 - 0.30 4 - 0.40 5 - 0.50
Total Score 2.90 3.20 3.60 2.80
Rank 4 2 1 3
Continue? Yes Yes No
Flow Control
• Automotive Thermostat (First Gen)– Residential radiator thermostatic valves too expensive
• Multiple Thermostats• Manual Valve• Electronic on/off• Density• Thermal Orifice• Bimetallic strip
Flow Control Concept Selection Matrix
A B C
(Previous Design
Automotive Thermostat Multiple Thermostats Manual valve
Selection Criteria Weight Rating Notes Wtd Rating Notes Wtd Rating Notes Wtd
Reliability 35% 1 - 0.35 3 - 1.05 3 (If operated correctly) 1.05
Ease Of Use 15% 5 No Interface 0.75 5 No Interface 0.75 1 Constant Attention 0.15
Cost 25% 5 - 1.25 4 - 1.00 5 - 1.25
Safety 5% 5 - 0.25 5 - 0.25 3 - 0.15
Maintenance 15% 4 - 0.60 4 - 0.60 5 - 0.75
Warm-Up Delay 5% 2 - 0.10 2 - 0.10 3 - 0.15Total Score 3.30 3.75 3.50
Rank 5 3 4Continue? Yes No
D E F G
Electronic on/off Density Thermal Orifice Bimetallic strip
Selection Criteria Weight Rating Notes Wtd Rating Notes Wtd Rating Notes Wtd Rating Notes Wtd
Reliability 35% 5 - 1.75 4 - 1.40 4 Needs pre-filter 1.40 4 - 1.40
Ease Of Use 15% 5 No Interface 0.75 5 No Interface 0.75 5 No Interface 0.75 5 - 0.75
Cost 25% 1 Must be Overcom 0.25 3 - 0.75 5 - 1.25 3 - 0.75
Safety 5% 3 - 0.15 5 - 0.25 5 - 0.25 5 - 0.25
Maintenance 15% 5 - 0.75 4 - 0.60 2 - 0.30 1 - 0.15
Warm-Up Delay 5% 4 - 0.20 2 - 0.10 3 - 0.15 4 - 0.20Total Score 3.85 3.85 4.10 3.50
Rank 2 2 1 6Continue? Yes Yes On Research No
Heat Recovery
• First Gen (flat plate integrated heat exchange)• Coiled tube in tube• Soldered Tube• Straight tube in tube
Heat Recovery Concept Selection Matrix
Heat Exchanger ConceptsA B C D
(reference)Segment First Gen Coiled tube in tube Soldered Tube Straight tube in tube
Selection Criteria Weight Rating Notes Wtd Rating Notes Wtd Rating Notes Wtd Rating Notes Wtd
Thermal Efficiency 30% 3 - 0.90 4 - 1.20 3 - 0.90 4 - 1.20
Material Cost 50% 2 - 1.00 3 - 1.50 4 - 2.00 3 - 1.50
Safety 10% 5 - 0.50 5 - 0.50 5 - 0.50 5 - 0.50
Maintenance 10% 2 - 0.20 4 - 0.40 4 - 0.40 4 - 0.40Total Score 2.40 3.20 3.40 3.20
Rank 4 2 1 3Continue? Yes Yes Yes
Concepts
Dual-Valve Convective Loop
Serpentine w/Pipe within Pipe
Spiral Black Tube Collector w/ Braided HX
Flat Plate w/Integrated HX and Dual Valve
Batch System: Reused Plastic Bottles
Final Concept SelectionA B C
Selection Criteria Weight Rating Notes Wtd Rating Notes Wtd Rating Notes WtdReliability 20% 2 0.40 2 0.40 2 0.40Ease Of Use 10% 3 0.30 3 0.30 3 0.30Cost 25% 3 0.75 2 0.50 1 0.25Safety 25% 2 0.50 3 0.75 3 0.75Maintenance 15% 2 0.30 4 0.60 3 0.45Warm-Up Delay 5% 2 0.10 3 0.15 4 0.20
Total Score 2.35 2.70 2.35Rank 5 3 4
Continue? Yes No
SPHINX (Previous Design)
Convective loop w/ divorced heat exchanger
parabolic collector tube within a tube
D E F G
Selection Criteria Weight Rating Notes Wtd Rating Notes Wtd Rating Notes Wtd Rating Notes WtdReliability 20% 3 0.60 3 0.60 2 0.40 3 0.60Ease Of Use 10% 3 0.30 3 0.30 4 0.40 1 0.10Cost 25% 2 0.50 2 0.50 4 1.00 1 0.25Safety 25% 3 0.75 3 0.75 3 0.75 4 1.00Maintenance 15% 2 0.30 3 0.45 3 0.45 3 0.45Warm-Up Delay 5% 2 0.10 3 0.15 3 0.15 1 0.05
Total Score 2.55 2.75 3.15 2.45Rank 2 2 1 1
Continue? Yes Yes Yes No
Flat Plate, Dual valve, integrated heat
exchangerSerpentine, Pipe Within
PipeCoiled Tube, Braided
Heat exchanger Batched Bottles
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