g love
Download
Skip this Video
Download Presentation
G  Love

Loading in 2 Seconds...

play fullscreen
1 / 24

G  Love - PowerPoint PPT Presentation


  • 83 Views
  • Uploaded on

G  Love. Kristin Brodie Jeff Colton Colin Galbraith Bushra Makiya Tiffany Santos. Objective. To create a glove that will generate heat to help keep one’s hand warm in a cold environment. What will this require? Source of heat How will they be different? Lightweight Smart

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' G  Love' - yaholo


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
g love

GLove

Kristin Brodie

Jeff Colton

Colin Galbraith

Bushra Makiya

Tiffany Santos

objective
Objective

To create a glove that will generate heat to help keep one’s hand warm in a cold environment

  • What will this require?
  • Source of heat
  • How will they be different?
  • Lightweight
  • Smart
    • Temperature Sensor/Switch
    • Rechargeable Battery
    • Reversible Exothermic Material
heat loss model
Heat Loss Model

Conduction

  • Cylindrical Hand
  • Power Lost @ -10C relative to Power Lost @ 25C
  • 2rLq = 2L(T1-T3)/R = 2.5W
    • R = Fabric Resistance + BL Resistance

Glove Layers

Convection

electrical resistivity testing
Electrical Resistivity Testing

All wire diameters are ~40mm

*R for wire wrapped around a finger

**R for wire after work-hardening

wire insulators
Wire Insulators

Teflon Tubing

Nextel Braids

batteries
Batteries
  • Amphr
  • Size
  • Durability
  • Recharge ability
field testing
Field Testing

My hand feels warm, stop recording

At what temperature is your hand comfortable?

Tested 10 subjects

  • Placed in freezer
  • Dressed in winter clothes
  • Wore gloves with heating element
  • 1.7W of power supplied
  • Temp recorded when subject said their hand was warm

Conclusion

  • Thermal Switch should turn power off at ~32C
temperature sensor switch
Temperature Sensor/Switch

Resistance/Current Testing

fabric
Fabric

Blends of Polyester/Cotton

were tested

  • Thermal Testing
  • Input Power = 1.73 W
    • 100cm of wire
    • 3.7V
  • Temperature inside and outside
  • of glove measured

Power Generated From Glove: 2rLq=2L(T1-T3)/R = 1.73 W

L/R = 0.018 W/K

Power lost using 100P* under conditions previously modeled: 2.7 W

phase change materials pcm
Phase Change Materials (PCM)

Polyethylene Glycol (PEG)

  • Tm = 26.6° C
  • Tc = 9.8° C
  • Hc = 151.0 J/g
  • Extremely hydrophilic

Octadecane

  • Tm = 27.2° C
  • Tc = 16.5° C
  • Hc = 283.5 J/g
  • Hydrophobic
pcm incorporation
PCM Incorporation

PURPOSE: To prevent leakage from glove when PCM melts.

Ideal Process

  • Microspheres to maximize surface area
  • Polypropylene (PP) / High Density Polyethylene (PE)
    • Can be used to encapsulate microspheres
    • Can be drawn into fibers
  • Extrusion of PEG/PP: phase separation

Complications

  • Different thermal properties of PEG and PE
  • Lack of Encapsulation Capabilities
  • Lack of Extrusion Facilities
microsphere fabrication
Microsphere Fabrication

Successfully produced both paraffin and octadecane microspheres.

Complications

  • Inefficiency of filtering process
  • Large scale production
final pcm designs
Final PCM Designs

Octadecane

  • Ground particles embedded in base material.
  • Polydimethyl Siloxane (PDMS) Resin
    • Thermal conductivity = 0.002W/m*K
  • 5g octadecane in 10ml (~7.5g) PDMS

PEG

  • Melting attempts failed.
  • Heat sealed in bags.
  • Low Density Polyethylene (LDPE)
    • Thermal conductivity = 0.33W/m*K
  • 7g of PEG in ~11g LDPE

-(CH2-CH2)-

comparison of pcm designs
Comparison of PCM Designs

Octadecane in PDMS

PEG in PE

Potential Heat: 2.36 J

Actual Heat: 1.16 J

Efficiency: 49%

Potential Heat: 0.66 J

Actual Heat: 0.43 J

Efficiency: 65%

pcm conclusions
PCM Conclusions
  • Octadecane is more efficient than PEG.
  • Polyethylene is more efficient than PDMS.
  • Future Recommendations
    • Encapsulate octadecane in polyethylene.
    • Extrusion
assembly
Assembly

Fabrication of Gloves

Inner Lining

Outer Cover

Sew wire into glove

Encapsulation of PCMs

Connect wires to temp. switch

Connect wires to battery

cost analysis
Cost Analysis

Competitors: $40-$150

future work
Future Work

Improvements

  • Encapsulation process
  • Incorporation of PCM into glove
  • Incorporation of thermally conductive material into PCM gloves
  • Incorporation of wire into glove
    • Insulation
  • Ease of access to recharge battery
  • On/Off switch
  • Application of Wire Insulation
  • Field Test Prototype w/ People or Heat Model
    • In Freezer
ad