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Sleeping Bags for Every Season

This study by John Myers and Devin Anderson explores how to combine sleeping bags effectively to ensure warmth in different climates. By determining the relationship between temperature rating and thermal resistance, the study uses a heating pad to measure steady-state conditions and calculate thermal resistance. The conclusions suggest the need for a larger sample size and a consistent power source to improve accuracy in predicting effective temperature ratings when combining sleeping bags.

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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

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