So where would I post this?

[Skeeter]

I did a little Googling, and found this in a research paper from California Agricultural Tech.

"Use of sprinklers can protect vines when temperatures fall to -3.9°C (25°F), if conditions are ideal. Water from the sprinklers supplies heat to the vine-water- atmosphere system. The heat is released as water cools to 0°C (32°F) and then freezes to ice. The most important factor in this situation is the heat of fusion (released as water freezes to ice). A gallon of water releases 300kcal (1200 BTU) of heat as it freezes."


So they are in fact heating the grapes with ice.

Weird, huh? [img]http://38.118.142.245/ubb2/smile.gif[/img]

Why this is different from frost, I'm not sure.