can you heat me now? initial prototype brie frame sandra gonzalez angela tong chenny zhu department...
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![Page 1: Can You Heat Me Now? Initial Prototype Brie Frame Sandra Gonzalez Angela Tong Chenny Zhu Department of Materials Science 3.082 Advisor: Hao Wang April](https://reader037.vdocuments.site/reader037/viewer/2022110207/56649d795503460f94a5d5fd/html5/thumbnails/1.jpg)
Can You Heat Me Now?
Initial Prototype
Brie Frame
Sandra Gonzalez
Angela Tong
Chenny Zhu
Department of Materials Science • 3.082 • Advisor: Hao Wang • April 13, 2004
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Outline of Presentation Objective Benefits of Heat Therapy Desired Device properties Components of prototype Energy sources comparison Circuits Insulating material/Outer layer Encountered problems Future work
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Objective
Design and fabricate a heat therapy device for lower back pain with a future use for transdermal drug delivery.
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Benefits of Heat Therapy
Relieves Pain Enhances recovery by stimulating
thermoreceptors (block transmission of pain signals to brain
Decreases Stiffness Relaxes Sore Muscles
Source: www.thermacare.com
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Desired Device Properties
Long Lasting Heat Competitive Cost Flexibility/Comfortability Portability
Battery Operated Heat Pad Satisfies All The Constraints!
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Device Schematic
Heating Components
Outer Covering
Conducting Layer
Insulating Layer
Outer Covering
Circuit
Heating Element
Battery
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Heating Pad Diagram
Battery Heating Element
ThermostatVoltage Regulator
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Energy Density Comparison
174.9150.8
68.57 64.0341.95
22.36
020406080
100120140160180200
En
erg
y D
ensi
ty (
Wh
/kg
)
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Voltage Regulator
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Thermostat Circuit
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Circuit Debugging
Voltage Regulator CircuitVoltage drops too low before shutoff
Thermostat CircuitFinding accurate resistance for temperature
set point Inconsistent turn on/ turn off pointHysteresis – turn on / turn off
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Heating wire
NiCr 80/20 Variables control Resistance (Ohms/ft)
Length Gauge - thickness
Resistance Power Heat P=V2 / R, V is constant = 7.4V
Trial and Error - find balance Minimize resistance Minimize current
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Detailed put together
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Securing The Wire
RTV SiliconeGreat Thermal Conductivity (0.83 W/mK)Temperature Range -55°C to 200 °CFlame RetardantFlexible
Source: http://www.mgchemicals.com
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Chemistry of RTV Silicone RTV = Room Temperature Vulcanization Cures in absence of heat Moisture from the air activates cross-linking agents Reactions produce non-acidic byproducts
CH3OHH2O
(liquid polymer compound) (rigid, rubbery silicone)
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Insulating MaterialOuter Material
COHRlastic Solid Silicone RubberThermally Conductive R10404
Thermal Conductivity 0.0037W/mK Outer Material
Cotton/Polyester blend
Cotton has a thermal conductivity of 0.03 W/mK.
An order of magnitude higher than COHRlastic!
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Problems
Obtaining Parts – lost in mailRTV siliconeBattery Charger
Finding correct heating wire length and gauge
Debugging circuits
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Future Work
Find correct length and gauge heating wire Coat circuit with hot glue to prevent short
circuits Sew outer band Put together all components
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Proposed ScheduleID Task Name
Feb 2004 Mar 2004 Apr 2004 May 2004
2/1 2/8 2/15 2/22 2/29 3/7 3/14 3/21 3/28 4/4 4/11 4/18 4/25 5/2 5/9
2 Obtaining Materials
14 Testing Materials
Processing/Building
18 Prototype Assembly
Testing and Troubleshooting Prototype
11
5/16
3 Wires
4 PCM
6 Polymer Gel
8 Battery
7 Insulating Material
Start
2/5/2004
3/2/2004
3/2/2004
3/9/2004
3/9/2004
3/9/2004
3/9/2004
4/1/2004
4/6/2004
4/6/2004
Finish
3/18/2004
3/4/2004
3/11/2004
3/11/2004
3/16/2004
3/16/2004
4/8/2004
4/8/2004
4/13/2004
5/6/2004
9 3/16/20043/9/2004Outside Material
10 3/16/20043/9/2004Wire Coating
5 3/11/20043/9/2004Thermal Switch
16 4/8/20044/6/2004Wire
17 4/8/20044/6/2004RTV Silicone
4/8/20044/1/2004Circuit
1 3/11/20043/11/2004Formal Design Review Presentation
4/13/20044/13/2004Initial Prototypes19
5/6/20045/6/2004Last Day of Lab Work
20
22
21
5/13/20045/13/2004Final Presentation/Posters Due
12 4/6/20043/23/2004Outer cover
13 4/6/20044/1/2004Circuit
15