• Post Reply Bookmark Topic Watch Topic
  • New Topic
permaculture forums growies critters building homesteading energy monies kitchen purity ungarbage community wilderness fiber arts art permaculture artisans regional education skip experiences global resources cider press projects digital market permies.com private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Anne Miller
  • Pearl Sutton
  • r ranson
  • Nicole Alderman
  • Mike Haasl
stewards:
  • paul wheaton
  • Joseph Lofthouse
  • James Freyr
master gardeners:
  • Carla Burke
  • John F Dean
  • jordan barton
gardeners:
  • Jay Angler
  • Greg Martin
  • Leigh Tate

nano-water-heater with hand-powered pressure?

 
pollinator
Posts: 1530
Location: Massachusetts, 6b, suburban, nearish coast, 50x50, full sun, 40" year-round even distribution
142
kids purity trees urban writing
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Just had this idea--what if I wanted to boil a tiny tiny quantity of water, just enough to sterilize a jam jar lid or a metal mouth-pick or something, couldn't this be done with human-powered hand-crank pressure, with enough leverage?  Has this been done?  
 
pollinator
Posts: 1706
Location: Denver, CO
80
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
That is an interesting idea; it reminds me of the compressive ignition used in diesel engines and some fire starting devices.  
 
Joshua Myrvaagnes
pollinator
Posts: 1530
Location: Massachusetts, 6b, suburban, nearish coast, 50x50, full sun, 40" year-round even distribution
142
kids purity trees urban writing
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Thanks Gilbert.

Well, I did a little research, and to boil 1 millileter of water (starting at about room temperature, 20 degrees Celsius) takes about 80 calories.  SO--makes you kinda appreciate fossil fuels or the sun a bit more.

BUT--what if steaming were all that was needed to sterilize? what if the quantity of water could be 1/10th of 1 millileter? Burning 8 calories takes walking up a flight of stairs approximately.  That's not trivial--it's not like pumping a pump.

Still, I'm finding value in exploring this line of thought.  

At some point I'll look up how hydrogen peroxide is produced.

 
gardener
Posts: 2047
Location: Ladakh, Indian Himalayas at 10,500 feet, zone 5
456
trees food preservation solar greening the desert
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
I've often heard, as a general rule of thumb, that when you power a tool with pedal power, you get about 100 Watts when pedaling pretty well. How much water could 100 W boil, in how much time?
 
Joshua Myrvaagnes
pollinator
Posts: 1530
Location: Massachusetts, 6b, suburban, nearish coast, 50x50, full sun, 40" year-round even distribution
142
kids purity trees urban writing
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
"The tap water started between 65 and 70 degrees F and boiled in an average of 1 minute 44 seconds, consuming an average of 39.3 watt hours."--from random website "https://www.plotwatt.com/2011/05/21/plotwatt-labs-boiling-four-cups-water/"

That was for 1 cups of water, or about .25 litre (250 ml).
.039 x 4 = .16 watt-hours to boil 1 ml.
.16 x 60 = 10 watt-minutes to boil 1 ml
so about 600 watt-seconds to boil 1 ml.
***or about 6 seconds at 100 watts.***

Did I do this math right?

Is it worth getting on a bike for even 6 seconds to boil something for sterilization?  seems like no.  better just store some energy in the daytime.

It could be that capacitors--the less-destructive cousin of batteries--would come in handy here for micro-disinfectings.

Or we could just forget germ theory entirely. (The things we do for other people, man!)

 
I didn't do it. You can't prove it. Nobody saw me. The sheep are lying! This tiny ad is my witness!
100th Issue of Permaculture Magazine - now FREE for a while
https://permies.com/goodies/45/pmag
reply
    Bookmark Topic Watch Topic
  • New Topic