Sleeping Bags for Every Season - PowerPoint PPT Presentation

a study of sleeping bag thermal resistance n.
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Sleeping Bags for Every Season

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  1. A study of sleeping bag thermal resistance Sleeping Bags for Every Season John Myers & Devin Anderson

  2. Problem and Objective: • Sleeping bags are rated only by lowest temperature they are usable in • How can you combine sleeping bags and make sure you're warm enough for the climate? • Determine and plot relationship between temperature rating and thermal resistance • Use plot to determine effective temperature rating of combinations of sleeping bags

  3. Method: • Place a heating pad with a 180 Watt power output in sleeping bags with various temperature ratings • Wait a sufficient time to reach steady-state conditions • Use thermometers inside and outside bag to determine temperature drop • Use relationship Q=(Tinside – Toutside)/Rtotal to find thermal resistance of each bag

  4. Results:

  5. Conclusions: • Data points are based on available bags and would be more accurate with a larger sample size of temperature ratings, and multiple bags for each rating • There may be variation in power output from the heating pad. A more consistent power source would improve the data • The trend line from the data plotted should allow you to combine sleeping bags and predict the effective temperature rating