P13411 High Temperature Waste Pasteurizer Brian Kilger Kyle Cohn Kyle Weston Stephanie Mauro
The Team Kyle Weston- Team Leader Stephanie Mauro- Thermal Engineer Kyle Cohn- Alternative Energy Engineer Brian Kilger- Materials Engineer
Agenda • Feedback (expectations and priorities for review) • Review from systems design review • Solar cooker experiment • The selected design and key features • Construction plan • Thermal analysis of the design • Updated risk assessment and project plan going into MSDII
Feedback We are Looking for from This Review • Comments on selected design and material selection • Pros and cons of the proposed test plan • Compatibility of our ideas with Haiti
Problem Statement • The primary objective of this project is to transform human waste into a safe to use fertilizer using renewable energy. The waste pasteurizer will be designed to meet the needs of a Haitian family (3-5 liters) while keeping the cost per unit under $50 USD.
The Solar Cooker Experiments • 3 separate experiments • Trial 1: • No Adjustments • Small Stainless Steel Pot • Not Peak Sunlight • Trial 2: • Adjustments • Small Stainless Steel Pot • Not Peak Sunlight • Trial 3: • Adjustments • Large Pot • Peak Sunlight
The Selected Design • Cylindrical container for waste handling inside another cylindrical container, using air as insulation • Heated from direct sunlight to top and reflected light from side flaps • Removable lid and inner container • Temperature indicator tool sticking through the lid
The Selected Design Fully Assembled Unit • Cross-Sectional View
What is a WAPI • Sight dependent • All parts submerged in water • Need to take out and flip over
The Modified WAPI Idea(iPooP) • Touch dependent • No touching parts submerged in waste • Spring loaded so wax won’t stick
Sealing Mechanism Lid design for use with latch Possible Latches Attach larger part to side of outer bucket Pull either from grooved tab attached to lid or screw loop into side of lid and pull down from there. • Grooves cut into tab of same material as lid (acrylic) for latch to grab.
Feasibility • Solar irradiance data was collected from Puerto Rico using the average conditions by day for the past 40 years • Determined how many days the minimum wattage was met for 5 hours • Calculations show that 306 days will meet our needs
Material Properties for Thermal Analysis • Composition of Waste gathered from Appropriate Technology for Water Supply and Sanitation composed by World Bank in December 1980.
Steady State Thermal Analysis Lid • Components of Analysis • Outer bucket • Inner bucket • Air as insulation • Waste • Acrylic Lid • Thermal Loads Applied • Insulated at axis of symmetry • Convection along outer bucket side and bottom • Energy Applied to top surface of lid in W Air Axis of symmetry Waste Air Inner bucket Outer bucket
Results of Thermal Analysis 60W applied to top of lid: 50W applied to top of lid: Waste between 62.35 and 71.17 °C Waste between 69.42and 80.01 °C
Results of Thermal Analysis Continued • Using Concrete as support/stand for inner bucket. • Requires a significant amount more of energy to heat the waste to the desired temperature. • Using kconcrete=0.1 W/mK 75W applied to top of lid: Waste between 60.55 and 71.64°C
MSD II First Steps • Address any outstanding items from the Project Review • Develop a project plan for MSD II • Purchase necessary materials • Initiate contact with those in charge of testing equipment • Begin assembly
Any Additional Questions? Thank You All for Your Time and Feedback