Making cooled clothing:

So, summer gets really hot, and it's not going to get better anytime soon. At my place, it isn't actively dangerous yet, but it's still unpleasant. A normal air conditioner uses a low boiling-point liquid: something like liquid propane will boil all the way down to -42 C. Just like water, this evaporation absorbs a lot of heat and the remaining liquid becomes very cold. Of course, releasing flammable gas is be wasteful and dangerous, so the vapor is captured and compressed: This increases the boiling point causing it to condense into a hot liquid. This condensed refrigerant is cooled back to ambient with a radiator before being passed through a flow restriction to drop the pressure back down: A fridge or AC (depending on the size of the box) While this is excellent for cooling a building, it's not great for small-scale applications: the compressor and hot-side radiator are quite bulky and require a source of electricity. Thermometric cooling sounds great: replace all the plumbing with…