Hello, I have another crazy project I'm working on and I need to know if this is viable before I spend a bunch of time and money. Here is the situation: I have a small block of Al. 1/4" x 1/4" x 1" long. Thru the length I drill a 1/16" hole. The surface will be whatever a standard drill bit produces. I now cool the block to -80F and pass air thru the hole (sealed from the outside of course.) The air in the 1/16" x 1" hole (about .001 cubic inches) will be in contact with the Al surface of .196 sq inches for about .0005 seconds. (I can vary it between 6-9 cubic inches per second.) Assuming the block stays at a uniform -80F, how much temperature difference can I expect between the air at the one side of the block to what exits the 1" long block? Assume your standard air, 70-100F, 10-20% humidity, standard pressure. If I changed it to a block of copper what will be the difference? Thank you.