To address hypothermia in casualties in cold environments

this paper designs a solar-powered rewarming sleeping bag for casualties in extreme cold conditions using phase change materials ODE@CaF2MPCMs and Cu2O@n-C20

which release heat during phase change at low temperatures. Hot water simulation and human experiments were conducted. Results show that in the hot water simulation at 0

4

and 8°C

with a 40°C initial phase change material temperature

the initial 37°C warm water can be maintained at around 36°C within 3600s

and the bilateral distribution of phase change materials has a higher heating rate than the unilateral distribution. In human experiments

at -5

0

and 5°C conditions

the average temperature can be maintained at about 35°C within 3600s

and the unilateral distribution of phase change materials has better insulation than the bilateral distribution

with an average temperature increase of 2°C; at -15°C

the average temperature can be maintained above 32°C within 540 minutes. The temperature distribution uniformity analysis shows that the maximum coefficient of variation for unilateral distribution is 0.036

and for bilateral distribution is 0.053

indicating a relatively uniform temperature distribution inside the sleeping bag

with unilateral distribution being more uniform than bilateral distribution. Comprehensive performance assessment shows that the sleeping bag has excellent insulation but needs optimization in convenience; after repeated experiments at -5°C for 30 times

the temperature effect remains almost unchanged

with only a 0.05°C decrease in average human body temperature after 30 uses; moreover

the cost of the sleeping bag is only about 400 yuan

a single heating to 40 ° C consumes about 0.24 ° C

which is low and has good economic benefits.