Re:Homemade Liquid Nitrogen with the Joule-Thompson Effect
by pjc50 on Monday August 19, 2019 @04:19AM
(#20735899)
Years ago when some friends and I first heard of "pycrete" and the plan to build an aircraft carrier out of ice, we wondered if it would be feasible to build a boat out of ice ourselves, and go punting down the Cam on it among baffled crowds.
We concluded we'd need several cubic meters of ice, and the thing would be impossible to transport outside the river, so it would have to be built in-situ, and the obvious choice for that much cooling was liquid nitrogen. Unfortunately we ran the specific heat numbers and concluded it would cost several thousand pounds to buy that much LN2 off the shelf, so there the project ended.
Given a homebrew LN2 supply, lots of fun (and dangerous) possibilities will present themselves.
(I've also been to a make-your-own-icecream festival in a wood which was done with LN2; blend ingredients, add LN2, stir frantically)
We concluded we'd need several cubic meters of ice, and the thing would be impossible to transport outside the river, so it would have to be built in-situ, and the obvious choice for that much cooling was liquid nitrogen. Unfortunately we ran the specific heat numbers and concluded it would cost several thousand pounds to buy that much LN2 off the shelf, so there the project ended.
Given a homebrew LN2 supply, lots of fun (and dangerous) possibilities will present themselves.
(I've also been to a make-your-own-icecream festival in a wood which was done with LN2; blend ingredients, add LN2, stir frantically)