60 likes | 94 Views
A study of sleeping bag thermal resistance. Sleeping Bags for Every Season. John Myers & Devin Anderson. 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?
E N D
A study of sleeping bag thermal resistance Sleeping Bags for Every Season John Myers & Devin Anderson
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
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
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