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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

Backpacking Heater

Blake Russon blakerusson@hotmail.com

Brian Larson bbl3@utah.edu

Landon Hall halllando@msn.com

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

Landmarks

  • Final Concept Selection, October 1st (Complete)
  • Completed Construction of CFP, Dec 9th (In Progress)
project overview
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)

project overview5
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)

design progress
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)

design progress7
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)

design progress8
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)

critical function prototype
Critical Function Prototype
  • What did we learn?
    • Surface Temperature ~ 150F
    • Plenty of heat.
      • Good sanity check
      • Sides are cool
    • Fan is too small.
critical function prototype10
Critical Function Prototype
  • What do we do next?
    • Begin drawings for small scale prototype.
    • Identify alternate fan source, possible blower.

Critical Function Prototype

summary
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.