4 ms·
Why would 0c water be better in a meaningful way compared to 25c? Most cooling is from the steam phase change, right?
by rightbyte 6y ago
Why would 0c water be better in a meaningful way compared to 25c? Most cooling is from the steam phase change, right?
- rad_gruchalski 6y agoMaybe because it's 25C cooler than 25C water. Takes more energy to convert to steam. I guess.
- rightbyte 6y agoMy point is: Water 1c change is 4184 J/kg (1 kcal) Water to steam 2260 kJ/kg. So 25c cooler is 25 * 4.184 kJ extra, which is: 25 * 4184 / (2260k + 75 * 4184) = 104600 / 2573800 => 4% more energy than 25c to steam. And then you need a refrigerator to cool tons of water, instead of just carrying more water.
- mrep 6y agoNo wonder my steam shower is the most power hungry appliance in my place at 10 KW.
- rad_gruchalski 6y agoHah, hacker news...
- doggodaddo78 6y agoIce, dry ice, liquid nitrogen would be even better. It's not about water putting out the fire directly, it's getting the Li-ion battery below thermal runaway to stop the self-immolation.