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A System of Wearable Electronic Heaters to Provide Bodily
Temperature Control
Wednesday, December 7th, 2016MEEN 475 - 502Samuel Terrill | Matthew Pledger | Andres Barrios | Richard Meeks | Guillermo Villalobos | Kyle SlatonInstructor: Dr. Tanil Ozkan
Outline
Market Need
System Overview
Material Selection
Material Process Selection
Auxiliary Part Selection
Conclusions
Introduce system background
•For athletes, every training session is essential to improve performance•Missed practices due to cold temperatures can hinder athletic growth•These athletic bands were thus created in order to heat up athletes during winter workouts to prevent unnecessary expenditure of energy
System OverviewThin bands of silicone rubber with copper wiring embedded circumferentially.
Contains a thin battery, small microcontroller, and temperature sensor
Bands are scalable for warming critical areas of the human body-near wrists, upper arm, legs, abdomen
Added benefit of keeping muscles warm for injury prevention.
Merit Index Derivation – Resistance Heater
Ashby Charts
● Young’s Modulus must remain below 150 GPA.
● Electrical resistivity must be minimized.
● Thermal conductivity greater than 100
AHP
Ranking: Thermal conductivity (K) = 2, Elastic Modulus (E) = 3,
Thermal Resistivity (𝜌e ) = 4, Density ( ) = 5, Cost (C) = 6𝜌Material Score Rank
Copper 0.49323 1
Aluminium 0.24353 3
Zinc 0.26325 2
Manufacturing Process
Final Selection: Sheet Forming Final Selection: Injection Molding
Temperature Sensor
Made of graphite and semi-crystalline acrylate polymer formed by 2 monomers
Flexible
Lightweight
Printable
Accurate "A Printable, Flexible, Lightweight Temperature Sensor." Phys.org - News and Articles on Science and Technology. N.p., 9 Nov. 2015. Web. 03 Dec. 2016.
Insulation
For insulation, material selection was qualitative
Desire higher resistivity for shock prevention
Desire medium thermal conductivity for mild insulation but adequate transfer to person
Thermodynamic Analysis[1] Qin,Device = Wout,activity + Qout,activity + Qout,body
[2] Qout,activity + Wout,activity = Metabolic Equivalent of Task (MET)[3] MET = METs × 3.5 × mass ÷
200[4] Qout,body = 100 Wh
→Qin,device = 365.468 kJ
Power Source
● Selected CP9V as power source.
● Slightly more expensive than others, but reasonable in bulk.
● Supports the required power as calculated.
Conclusions
Target Market: Athletes and Outdoor Enthusiasts
Design: Thin, circular, silicone bands with wiring
Components: Thin battery, temperature sensor, and small microcontroller
Merit Indices:
Ashby method and industry research nominated silicone rubber for the bands
AHP Method nominated copper as final product for electrical wiring
Questions?
Referenceshttp://www.matweb.com/search/datasheet.aspx?matguid=9aebe83845c04c1db5126fada6f76f7e&ckck=1http://asm.matweb.com/search/SpecificMaterial.asp?bassnum=MA6063T1http://www.matweb.com/search/DataSheet.aspx?MatGUID=8909140a76074049809ad74d536ed606&ckck=1http://www.infomine.com/investment/metal-prices/http://www.boatzincs.com/zinc-vs-aluminum-chart.htmlhttp://www.brightvolt.com/products/flexion-batteries/http://jap.physiology.org/content/87/5/1957.full#sec-18http://phys.org/news/2015-11-printable-flexible-lightweight-temperature-sensor.htmlhttps://www.shinetsusilicone-global.com/catalog/pdf/rubber_e.pdfhttp://www.azom.com/properties.aspx?ArticleID=920http://www.eurotherm.com/products/power-control/zelio-solid-state-relays/i-o-series-output