Download - High Temperature Waste Pasteurizer
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High Temperature Waste Pasteurizer
Brian KilgerKyle Cohn
Kyle WestonStephanie Mauro
P13411
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The Team
Kyle Weston- Team Leader
Stephanie Mauro- Thermal Engineer
Kyle Cohn- Alternative Energy Engineer
Brian Kilger- Materials Engineer
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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
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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
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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.
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Customer Needs
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Engineering Specifications
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Functional Decomposition
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Systems Architecture
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The Simplified Project Scope
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Remaining Schedule Task List
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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
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The Summarized Results
0 50 100 150 200 25040
60
80
100
120
140
160
180
Temperature of Water
Experiment 1 Water TempExperiment 2 Water TempExperiment 3 Water Temp
Time (Min)
Degr
ees (
F)
0 50 100 150 200 25040
90
140
190
240
290
Temperature of Box
Experiment 1 Box TempExperiment 2 Box TempExperiment 3 Box Temp
Time (Min)
Degr
ees (
F)
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The Summarized ResultsExperiment 1
Time Elapsed 150mMax Temperature of Box 162FMax Temperature of Water 90FMinutes to 149F requirement NA
Experiment 2Time Elapsed 180mMax Temperature of Box 238FMax Temperature of Water 144FMinutes to 149F requirement NA
Experiment 3Time Elapsed 240Max Temperature of Box 232Max Temperature of Water 170Minutes to 149F requirement ~150m
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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
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The Selected Design
• Cross-Sectional View • Fully Assembled Unit
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Test Plan
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Bill of Materials
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What is a WAPI
• Sight dependent• All parts submerged
in water• Need to take out and
flip over
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The Modified WAPI Idea(iPooP)
• Touch dependent• No touching parts submerged in
waste• Spring loaded so wax won’t stick
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Sealing MechanismLid 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.
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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
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Material Properties for Thermal AnalysisComposition of Human Waste in Developing countries
Component % Sub-components % Thermal Conductivity [W/mK]
Effective Thermal Conductivity ofWaste [W/mK]
Water 0.9 none none 0.563
2.5269652Dry Composition 0.1
Organic Matter 0.256 0.15Nitrogen 0.07 0.234
Phosphorus (P2O5) 0.054 0.118Potassium (K2O) 0.025 85
Carbon 0.55 21Calcium (CaO) 0.045 143.7
Summary of Materials Used
Component MaterialThermal
Conductivity [W/mK]
Plastic Bucket Polyethelene 0.42Graniteware Pot Steel, Porcelain 8.75
Lid Acrylic 0.2Insulation Air 0.027
Input Waste 2.527Stand/Support Concrete 0.1
• Composition of Waste gathered from Appropriate Technology for Water Supply and Sanitation composed by World Bank in December 1980.
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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
Air
Lid
Axis of symmetry
Inner bucket
Outer bucket
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Results of Thermal Analysis
Waste between 62.35 and 71.17 °C
50W applied to top of lid: 60W applied to top of lid:
Waste between 69.42and 80.01 °C
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Results of Thermal Analysis Continued
Waste between 60.55 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 kconcrete=0.1 W/mK
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Updated Risk Assessment
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Updated Risk Assessment
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Updated Risk Assessment
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Updated Risk Assessment
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Updated Risk Assessment
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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
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Any Additional Questions?
Thank You All for Your Time and Feedback