Replies to post #165991 on Zeev's Turnips Patch-No Politics (ZEEV)

[tantal]

Liquid nitrogen is fantastically cold, but it is actually a fairly inefficient coolant, because it does not absorb much heat per unit volume per unit temperature (low specific heat). IOW, you may be anticipating that it would behave simialarly to water cooled by the same amount, but it really wouldn't. You would need a fairly large amount of liquid nitrogen to get a significant cooling effect.

Might be worth a try, though.

[Zeev Hed]

Two years ago, we (Invent Resources , Inc.)approached the Insurance institute, proposing to them a system that will protect individual houses for a period of 4 hours during such fires. We wanted them to fud the development ( a puny $350,000). Their response was shocking. They are not in the business of preventing fire losses or other reason for insurance. If they did, insurance would not be needed and their business would go down....

A $2 B loss once or twice per decade surely justifies the billions and billions in insurance fees they get every year. Now, they said, if we could do something about hurricanes....then they would be interested. Liquid nitrogen "cannisters" are not going to create enough of a blanket to prevent sreading of the fire, and it surely will not cool much of an area...