P11462: Thermoelectric and Fan System for Cook Stove
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Identify Risks

Risks Associated with TEG
ID Risk Item Effect Cause Likelihood Severity Importance Action to Minimize Risk Owner
1 TEG Overheat Total System Failure Inadequate heat transfer control 2 3 6 In-depth heat transfer analysis including FEM and testing Jeff
2 Insufficient TEG cooling Unsustainable operation Heating up of TEG cold side 2 2 4 In-depth heat transfer analysis of heat sink Brad
3 Unable to maintain max TEG efficiency TEG capabilities not optimized. System does not operate at full potential. Inadequate power use analysis/ not designed to run at maximum power band of TEG 2 2 4 In-depth analysis/Testing Tom/Jeff
4 Inability to accurately model TEG Optimal power output not realized TEG model changes with heat and current. Load resistance has effect. 2 2 4 In depth analysis and modeling/testing Jeff/Tom
5 TEG power production capability insufficient Underpowered system Unable to meet required temperature difference across TEG. TEG maximum output too small. 1 3 3 Design with minimal power consumption. Verify TEG max output. Jeff/Tom
Risks Associated with Electrical System
ID Risk Item Effect Cause Likelihood Severity Importance Action to Minimize Risk Owner
6 Battery Failure/Destruction Total System Failure Poor battery sizing, excessive heat 2 3 6 Proper battery sizing, means to bypass battery, batter shielded from heat Fahad
7 Component Melting System Failure Excessive heating of components 2 2 4 Insulated design for temperature sensitive components Tom/Jeff
8 Faulty design of control system System failure Components not sized properly or arranged in correct order 2 3 6 In-depth analysis of control system design Tom
9 Battery does not charge Fan will not run at start-up/Aux. device may not charge Poor battery sizing, too little current to battery, battery malfunction 2 2 4 Produce design with minimal power consumption, test battery selections Fahad
10 Battery is drained Fan will not operate at start-up/Aux. device will not charge Battery is not sized properly and doesn't hold charge well 3 1 3 Extensive battery testing. Analysis of energy requirements at start-up. Possible warning light. Fahad
Risks Associated with Fan
ID Risk Item Effect Cause Likelihood Severity Importance Action to Minimize Risk Owner
11 Fan Produces insufficient pressure drop Forced air unable to reach combustion chamber Poor modeling/testing of fan 2 2 4 Select appropriate fan. Increase flow rate. Jared
12 Fan melts Loss of airflow. System Failure Fan placed too close to stove. Underestimation of stove temperature. 1 3 3 Testing to correctly estimate temperatures at proposed location. Jared
13 Fan requires too much power Fan will drain power from battery. TEG will be unable to provide enough power and system will fail. Poor fan selection or design. Fan failure. 1 2 2 Apply margin of safety on battery and fan sizing Jared
Risks Associated with Conduction Rod
ID Risk Item Effect Cause Likelihood Severity Importance Action to Minimize Risk Owner
14 Heat Conduction Rod/Device Melting Possible loss of heat conduction to TEG Inadequate analysis of stove temperatures and material properties 2 3 6 Analyze stove operating temperatures. Select materials to suit Brad
15 Heat conduction device conducts too much/too little heat Possible overheating of TEG/Insufficient power generation Inadequate heat transfer analysis 2 3 6 Complete analysis of heat transfer characteristics of device. Average stove operating temps should be considered. Brad
16 Rod takes too long to heat up Improper system function. Fan may not operate at start-up. Inadequate heat transfer analysis. Inadequate understanding of transient temperatures in combustion chamber. 2 2 4 Test stove to gain understanding of transient temperatures. Transient modeling of rod. Brad
Risks Associated with System/Project Managment
ID Risk Item Effect Cause Likelihood Severity Importance Action to Minimize Risk Owner
17 Transient Modeling Forced induction may fail at start-up/battery is drained Insufficient transient heat transfer modeling. Insufficient energy storage capabilities 3 2 6 Rigorous transient heat transfer analysis. Careful selection of heat transfer method. Extensive testing Brad/Tom
18 Inadequate means to prototype/produce product (tooling) Failure to provide prototype for testing. Failure to deliver product to customer. Complex components, exotic manufacturing methods (CNC), insufficient consideration given to lead times. 2 3 6 Consider means of production when in design process. Plan ahead for lead times. Brad
19 Casing conducts too much heat Jeopardize user safety insufficient insulation 2 3 6 Testing of radiant and conductive heat transfer in casing Jeff
20 Product Cost Exceeds acceptable/affordable cost for Hatians Excessive component cost 2 2 4 Design based on cost Jared
21 Insufficiently attaches to stove Failure to meet CN 9,10. Possible damage to unit. Poor design planning 2 2 4 Decide on robust design early in process and test. Tests should include durability. Brad

Identify Customer Needs | Establish Target Specifications | Identify Risks | Generate Product Concepts | Select Product Concept(s) | Proposed Product Concept | Project Interfaces | Concept Design Review Documents | Concept Design Review Action Items

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