Caporegime
- Joined
- 20 Oct 2002
- Posts
- 76,526
- Location
- Wish i was in a Ramen Shop Counter
Q = MC delta T
0.5l x 4,200J x 80C = 168,000 Joules to boil 500ml of water.
Best Ni-Mh batteries = 11,664 Joules.
168,000/11,664 = 14 AA batteries for one boil, the battery pack would weigh 331g and would take 20mins to discharge that much energy without overheating.
A useful portable kettle would therefore have to have about 140 AA batteries which would weigh 3.3KG and would last 10 boils taking 2 mins each. Not really practical is it?
Why 80c ? surely you want it to be 100?
Is it because that's hot enough, so it'll do ?