p13411: high temperature waste pasteurizer kyle weston – team lead eng. kyle cohn – lead...
TRANSCRIPT
P13411:High Temperature Waste Pasteurizer
Kyle Weston – Team Lead Eng.Kyle Cohn – Lead Structural Eng.Brian Kilger – Lead Manufacturing Eng.Stephanie Mauro – Lead Thermal Eng.
Agenda Project Description
Customer Needs Engineering Specifications Concept Summary
System Architecture Design Summary
Prototype Design Ideal Design
Cost Analysis Results of Testing Project Evaluation
Suggestions for Improvement
Project Description To design an inexpensive waste pasteurizer to
transform waste into a safe to use fertilizer using renewable energy and materials available in Haiti.
Customer Needs:CN# Description Customer RankingCN1 Contain pathogens during process 9CN2 Make end product free of pathogens 9CN3 Cost <$50 9CN4 Safe human interface 9CN5 Environmental resistance 9CN6 Easily repaired 3CN7 Easy to load/unload 3CN8 Easy to use 3CN9 Easy to relocate 3CN10 Use local materials 3CN11 Minimize time required to pasteurize 1CN12 Meet the needs of a family of 3-5 people 1CN13 Communicate to the user that temperatures have been reached 1
Time to Pasteurize
Engineering SpecsSpec # CN # Importance Description Measure of
PerformanceEngineering
UnitsMarginal
Value Ideal Value
ES1 CN2, CN11 9Provide heat to waste using renewable energy in order to kill pathogens
Temperature, Time °C, hours 50 °C for 1
week63 °C for 1
hour
ES2 CN4 9 Vent combustive gasses in order to prevent explosions and smell
Amount of methane inside chamber
ppm 50,000 Less than 30,000
ES3 CN1, CN4 9 Contain pathogens, do not allow unsafe leakage of untreated wastes Is there leakage? Binary
(Yes/No) No No
ES4 CN4 9 Temperature of the access door or handle Temperature °C 50 °C 38 °C
ES5 CN1, CN5 9 Are any electrical components sealed from possible water damage?
IEC60529 Digit 2Level O-8
Binary (Yes/No) No No
ES6 CN1, CN5 3 The product should withstand the winds experienced by Haiti
Does the product withstand wind mph 20 mph 25 mph
ES7 CN4, CN7, CN8 3 Customer must be able to easily add,
stir (optional) and remove wasteTime to add, stir and remove material
minutes
ES8 CN12, CN7, CN9, CN11 3 Volume of product accommodated Volume Liters 3 liters 5 liters
ES9 CN2, CN11 9 Does the entire sample of human waste contain safe pathogen levels Temperature
ES10 CN13 1 Show Disinfection has taken place Yes Yes
Did not pass Not necessary Pass marginal value Pass ideal value
Concept Selection Datums
Capetown Project (left)
Cookit (right)
3 Concepts with highest scores from Pugh Chart
Combined features from the top 3 concept into one design
Systems Architecture
Design Summary: Assembly
Design Summary: iPooP Indicator of Pasteurization of our Poop
Spring Chamber
Wax Chamber
Spring
Wax
Divider Piece
Push Rod
Cost Analysis Total cost of Prototype: $209.11
Some parts needed to be purchased in large lot sizes
Some parts were donated by the MSD department
Total cost of mass produced unit: $63.47 Includes all necessary parts in price
(Customers provide no extra materials) Plenty of opportunities exist to reduce price
Results: Heat Test
Temperature inside inner pot reached 65.5 C for 1 hour iPooP successfully indicated pasteurization Handle did not stay below 49 C
Results: Wind Test
Preliminary testing resulted in design change of permanently securing reflectors in place
Showed no signs of degradation or tipping while experiencing 20 mph winds
Could not be tested at 25mph wind speeds
Reflector Angle: 30°Gust of Wind 1 2 3 4 5 6 7 8 9 10Windspeed [mph] 13 16 18 12 19.3 20 12 10 7 9
Reflector Angle: 60°Gust of Wind 1 2 3 4 5 6 7 8 9 10Windspeed [mph] 13.8 12.5 13.2 19.8 12.8 16.9 18.9 17.4 12 8
Reflector Angle: 90°Gust of Wind 1 2 3 4 5 6 7 8 9 10Windspeed [mph] 13.8 14.8 16.9 16.5 9 14 15.7 15.9 12.7 16.7
Results: Additional Tests Leak Test: No water leaked from inner bucket
to outer bucket Load Test: 5 subjects were each able to load
and unload the pasteurizer in under 1 minute Volume Test: Pasteurizer held minimum
requirement of 3L of water Durability Test: Pasteurizer withstood strong
kick Wax Melting Temperature Test: Selected
wax used in iPooP has a melting temperature of 58.8 °C
Evaluation Successful accomplishments:
Re-usable pasteurizer Does not need potable water Pasteurizes waste in 2.5 hours based on iPooP Most components can be replaced or repaired in
Haiti Potential Improvements
Handle of pot reaches too high of a temperature and would need to be allowed time to cool before handling
Wax in iPooP melts at a temperature below the ideal pasteurization temperature
iPooP can not be easily replaced in Haiti
Lessons Learned Should have considered handle temp requirement
when purchasing pot Should have ordered wax and tested melting
temperatures earlier Should have allotted more time for testing Should have acquired materials from what was
available as extra and from the machine shop
Suggestions for Improvement Testing in Rochester in Spring/Summer Testing in Haiti (actual environment) Use of cheaper materials or materials more
readily available in Haiti Possibility of using in conjunction with Portable
Multi Use Shelter (P13414) Possibility of using in conjunction with Bloom Box
Solid Oxide Fuel Cell, which is powered by biomass: http://www.greentechmedia.com/articles/read/a-bloom-box-for-your-pocket
Acknowledgements Guide: John Kaemmerlen Customer: Sarah Brownell
Machine Shop Brian Thorn Carl Lundgren John Wellin
Thank You for your Support and Guidance