Team P08404: Solar Pasteurizer Concept / System Design Review Review Date: 1/25/2008 Team Members: Ben Johns (ME) Adam Yeager (ME) Brian T Moses (ME) Seby Kottackal (ME) Greg Tauer (ISE) Faculty Guide: Dr. Stevens

Discussion Content Project definition Functional Diagram General overview Team Roles Customer Needs Engineering specs Functional Diagram Subsystem Selection Concept Selection System Architecture Modeling High Risk Technologies/Feasability http://bznotes.wordpress.com/2006/07/25/water-elixir-of-life-is-in-short-supply/ 1/25/2008 P08404 System Review

Project Background Daily 5000 children are dying from diahorreal diseases directly related to lack of poor drinking water quality (Who Water for Life). It is this team’s goal to design a working prototype that can safely pasteurized water in a developing country. http://bznotes.wordpress.com/2006/07/25/water-elixir-of-life-is-in-short-supply/ 1/25/2008 P08404 System Review

Project Background Continued 1/25/2008 P08404 System Review

Team Roles 1/25/2008 P08404 System Review

Customer Needs End User Oriented Needs: EPA Oriented Needs: 1/25/2008 Safely pasteurize enough H20 for one typical family in a tropical climate. Cheap To maintain: Must be affordable to upkeep for typical family of interest. To produce: Unit must be cheap enough to get into hands of customer. To use: Should have no consumables – no direct cost to run. Easy to Use: Customer will likely have limited educational background, may be illiterate, and probably won’t know English. Assemble: If possible, end customer should be able to set up unit themselves. Maintain: Again, should be serviceable by end customer. Safe: Device must not pose direct health risk to end user (no sharp edges, hot surfaces, excessive glare, etc.) Durability: Device should last a significant amount of time   EPA Oriented Needs: Environmentally Friendly: Should be made of materials and employ processes that will not be harmful to the environment. Distributable: Should be easy to get into end user’s hands. Tamper Resistant: Should resist undesired repurposing. Solar: Must be powered by solar energy, per project guidelines. Need Importance Safely Pasteurize Enough Water 9 Cheap Easy to Use 3 Easy to Assemble Easy to Maintain Safe Environmentally Friendly Distributable Resistant to Unintended Uses 1 Solar Powered 1/25/2008 P08404 System Review

Engineering Specs 1/25/2008 P08404 System Review

Functional Diagram 1/25/2008 P08404 System Review

Subsystem Concept Pugh Collector Concepts   A B C D (reference) Segment First Gen Serpentine Flat Plate Black Coil Evac Tube Selection Criteria Weight Rating Notes Wtd Thermal Efficiency 35% 3 - 1.05 4 1.40 2 0.70 5 Material Cost 25% 1.00 0.75 1.25 1 Reliability 30% 0.90 1.20 0.60 Maintenance 10% 0.30 0.40 Total Score 3.25 3.75 2.85 2.80 Rank Continue? No Yes Heat Exchanger Concepts   A B C D (reference) Segment First Gen Coiled tube in tube Braided Tube Straight tube in tube Selection Criteria Weight Rating Notes Wtd Thermal Efficiency 50% 4 - 2.00 5 2.50 2 1.00 1 Material Cost 40% 3 1.20 Maintenance 10% 0.20 0.30 Total Score 3.20 3.70 3.00 2.10 Rank Continue? No Yes 1/25/2008 P08404 System Review

Subsystem Concept Pugh Cont. Flow Control Concepts   A B C D E (Previous Design) Automotive Thermostat Multiple Thermostats Manual valve Electronic on/off Density Driven Selection Criteria Weight Rating Notes Wtd Reliability 35% 2 - 0.70 3 1.05 1 (If operated correctly) 0.35 Ease Of Use 15% 5 No Interface 0.75 Constant Attention 0.15 Cost 25% 1.25 Must be Overcom 0.25 Maintenance 4 0.60 Warm-Up Delay 10% 0.20 0.30 0.40 Total Score 3.50 3.35 2.20 2.50 2.65 Rank Continue? Yes No 1/25/2008 P08404 System Review Multiple Thermostats Density Driven Thermostat Valve in custom enclosure

Concept Selection B A C E D 1/25/2008 P08404 System Review

Full Concept Pugh D B 1/25/2008 P08404 System Review   A B C D E F SPIHX (Previous Design) Serpentine Flow, Convective loop Circulation, Coiled Tube in Tube HX, Upstream Temp Regulation Parabolic Reflector, Evac tube collector, Tube in Tube HX, Automotive Thermostat Serpentine Flat Plate, Tube in Tube HX, Automotive Thermostat Coiled Tube, Braided HX, Automotive Thermostat Batched Bottles Selection Criteria Weight Rating Notes Wtd Thermal Efficiency 40% 3 1.20 4 1.60 5 2.00 2 0.80 1 0.40 Cost 30% 0.30 1.50 Ease of Use 10% 0.10 Safety 15% 0.60 0.75 Maintenance 5% 0.15 0.20 0.05 Total Score 3.50 3.95 3.10 3.60 3.40 2.80 Rank 6 Continue? No Yes B D 1/25/2008 P08404 System Review

System Architecture 1/25/2008 P08404 System Review

Modeling 1/25/2008 P08404 System Review

High Risk Technologies 1/25/2008 P08404 System Review