I am completly opposed to Air-conditions propagandized as a solution to climate change. What is the wright approach to combating this state of temporary relief except from old-fashioned fans? Don’t get me wrong. They do the job for me. I am reffering to finding a solution for people more with health issues or large facilities that are in need of something more drastic.
@HerbGrower
Yes, that is the problem. It only lasts an hour or two at most. I used a two litre plastic milk container rather than a normal hot water bottle.
IIRC the latent heat of fusion of water is about 333kJ/kg. So 666kJ for 2L. With ice that averages out to about 23w over a nights sleep. Heat capacity of water is 4.2kJ/kg/k, so even if its 0c as a liquid, to warm up to body temperature is under 300kJ.
TLDR: Water going from a ~0c solid to ~0c liquid takes more than twice as much energy as ~0c liquid water warning up to body temperature.
The ice also only melts to 0c, so you get that benefit as well.