High Temperature Waste Pasteurizer Brian Kilger Kyle Cohn Kyle Weston Stephanie Mauro P13411

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.

Customer Needs

Engineering Specifications

Functional Decomposition

Systems Architecture

The Simplified Project Scope

Remaining Schedule Task List

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 Summarized Results

Experiment 1 Time Elapsed150m Max Temperature of Box162F Max Temperature of Water90F Minutes to 149F requirementNA Experiment 2 Time Elapsed180m Max Temperature of Box238F Max Temperature of Water144F Minutes to 149F requirementNA Experiment 3 Time Elapsed240 Max Temperature of Box232 Max Temperature of Water170 Minutes to 149F requirement~150m

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 Cross-Sectional View Fully Assembled Unit

Test Plan

Bill of Materials

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 Grooves cut into tab of same material as lid (acrylic) for latch to grab. 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.

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 Human Waste in Developing countries Component%Sub-components% Thermal Conductivity [W/mK] Effective Thermal Conductivity of Waste [W/mK] Water0.9none Dry Composition 0.1 Organic Matter Nitrogen Phosphorus (P 2 O 5 ) Potassium (K 2 O) Carbon Calcium (CaO) Summary of Materials Used ComponentMaterial Thermal Conductivity [W/mK] Plastic BucketPolyethelene0.42 Graniteware PotSteel, Porcelain8.75 LidAcrylic0.2 InsulationAir0.027 InputWaste2.527 Stand/SupportConcrete0.1 Composition of Waste gathered from Appropriate Technology for Water Supply and Sanitation composed by World Bank in December 1980.

Steady State Thermal Analysis 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 Waste Air Lid Axis of symmetry Inner bucket Outer bucket

Results of Thermal Analysis Waste between and °C 50W applied to top of lid: 60W applied to top of lid: Waste between 69.42and °C

Results of Thermal Analysis Continued Waste between and 71.64°C 75W applied to top of lid: Using Concrete as support/stand for inner bucket. – Requires a significant amount more of energy to heat the waste to the desired temperature. – Using k concrete =0.1 W/mK

Updated Risk Assessment

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