1. Thermal Enforcement Matt Reznicek Tim Croyle Scott Nedrow

2. Project Requirements Maintain Battery Pack at 100°F +-20° Provide responsive and accurate measurements of battery temperatures Be within budget of project ($3000) Have low impact on battery performance

3. Initial State of Project Data AcquisitionTemperature Measurement

4. Heating Concepts 1.Resistive Pad Heating 2.Convection Heating (i.e. Diesel Heater) 3.AC Internal Resistance Heating

5. Resistive Pad Heating Test 1: 60 Watt Pad on side of battery Pros: Fast Easy Cons: Expensive Not uniform Installation

6. Resistive Pad Heating Test 2: 60 Watt Pad underneath battery Pros: Fast Easy Cons: Expensive Not uniform

7. Resistive Pad Heating Test 3: 80 Watt Wrap-around Pad Pros: Inexpensive Uniform Heating Cons: Bulky Slow Acts as insulator Inefficient

8. Convection Heating Cons: Expensive ($2000+) Slow High air Temperatures Quick cycle time Pros: Not Primarily Electric Uniform Heating

9. AC Current Heating Pros: Uniform Heating Low Power Inexpensive Very Fast Cons: Circuit Design

10. Comparison Heating TestSpeedPower DrawUniformityFeasibilityCostAverage Pad Heater on Side234142.8 Pad Heater Underneath334143 Pad Heater Wrap442423.2 Convection Heating513333 AC Resistance Heating121211.4

11. Cooling Fan Test Observations: Somewhat Linear cooling Faster than anticipated Power draw of ~240 W Air leaking past box lid

12. Future Work More thorough cooling tests Get HEHMMWV mobile More AC internal resistance heating tests Circuit design for AC heating and cost analysis Troubleshoot LabView programming

13. Questions?