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Backpacking Heater

Backpacking Heater. Blake Russon blakerusson@hotmail.com Brian Larson bbl3@utah.edu Landon Hall halllando@msn.com. Presentation Outline. Schedule Project Overview Review Design Goal Benchmark Design Specifications Design Progress Heat Requirements Fuel Source

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Backpacking Heater

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  1. Backpacking Heater Blake Russon blakerusson@hotmail.com Brian Larson bbl3@utah.edu Landon Hall halllando@msn.com

  2. Presentation Outline • Schedule • Project Overview • Review Design Goal • Benchmark Design Specifications • Design Progress • Heat Requirements • Fuel Source • Critical Function Prototype • Design Intent

  3. Schedule Landmarks • Final Concept Selection, October 1st (Complete) • Completed Construction of CFP, Dec 9th (In Progress)

  4. Project Overview Problem: Every year around 30 deaths and 450 injuries(1) occur due to improperly vented camping equip. Goal: Develop a heater that eliminates these injuries. 1) www.cpsc.gov/cpscpub/pubs/5008.html 2) www.rei.com – Product ID #664605 Catalytic Heater(2)

  5. Project Overview Benchmark Design Specs: • Safe (Dummy Proof) • Clean, non-toxic warm air • Protected flame • Waterproof • Small and Lightweight • Volume: 4-10 in3 • Weight: ½ - 2 lbs. • Burn Time • 4-12 Hours per fuel source 1) www.zodi.com/web-content/Consumer/ zodihotventhp.html Zodi Tent Heater(1)

  6. Design Progress Design Idea: Only heat the body. Heat Requirements: Qstorage = M-RC-E M ≈ 60 W/m2 E ≈ -10 W/m2 RC ≈ -165 W/m2 Q≈ -115 W/m2 Sbody ≈ 2.0 m2 (1) Req. ≈ 230 Watts (Summer Clo = .4) ≈ 120 Watts (Winter Clo = 1.0) 1) www.halls.md/body-surface-area/bsa.htm 2) http://personal.cityu.edu.hk/~bsapplec/heat.htm Heat Exchange in The Enviorment(2)

  7. Design Progress Fuel Source Selection: • Propane/Butane • Eliminate (fumes/explosive) • Candles • Paraffin Wax • Eliminate (fumes) • Beeswax • Non-toxic, sootless • High energy density (1) • Long burn time (15 hours) 1) www.rei.com – Product ID #695264 Butane Fuel Canister(1)

  8. Design Progress Heat Analysis of Beeswax Analytical Analysis Heat Density ≈ 19,000 BTU/lb.(1) --- (44,190 J/g) Burn Rate ≈ 3.28 g/hr(2) --- (0.0009111 g/s) Heat Output = Density*Burn Rate 40.3 Watts per Candle Experimental Results 35 – 42 Watts (38 Average) NEED 3-4 CANDLES (120-160 Watts) • http://zenstoves.net/Fuels.htm • www.beeswaxcandles.com Beeswax Candles(2)

  9. Critical Function Prototype • What did we learn? • Surface Temperature ~ 150F • Plenty of heat. • Good sanity check • Sides are cool • Fan is too small.

  10. Critical Function Prototype • What do we do next? • Begin drawings for small scale prototype. • Identify alternate fan source, possible blower. Critical Function Prototype

  11. Summary • Goal – Eliminate heater related injuries. • Solution – Beeswax candles to heat only pre-insulated spaces. • Heat Requirements – Around 120 Watts • Candle Output – 40 Watts per candle • Design will require 3-4 candles. • CFP – Goals are attainable • Manufacture small scale prototype.

  12. Any Questions?

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