Форумы Modlabs.net: Охлаждение сухим льдом. - Форумы Modlabs.net

Какая у него температура конденсации при атм. давлении?

Плохая затея, ИМХО. Я так понимаю, речь пошла о такой конструкции: труба; внизу сухой лёд; верхняя часть охлаждается фреонкой; сухой лёд испаряется, идёт вверх, конденсируется, опять выпадает на дно.
Не надо забывать, что от давления зависит и температура испарения! Так что, если в "контуре" с СО2 не будет разное давление конденсации и испарения, вы -80 не получите.

как насчёт машины которая будет делать сухой лёд? Насколько это реально?

To make dry ice, you start with a high-pressure container full of liquid carbon dioxide. When you release the liquid carbon dioxide from the tank, the expansion of the liquid and the high-speed evaporation of carbon dioxide gas cools the remainder of the liquid down to the freezing point, where it turns directly into a solid. If you have ever seen a carbon dioxide fire extinguisher in action you have seen this carbon dioxide snow form in the nozzle. You compress the carbon dioxide snow to create a block of dry ice.

Dry ice manufacturing starts with liquid carbon dioxide held under pressure (300 psi) in bulk storage vessels. To begin making dry ice, the liquid C02, is sent through an expansion valve into an empty chamber where under normal atmospheric pressure it flashes into C02 gas. This change from liquid to gas causes the temperature to drop quickly. About 46% of the gas will freeze into dry ice snow. The rest of the C02 gas, 54%, is released into the atmosphere or recovered to be used again. The dry ice snow is then collected in a chamber where it is compressed into block, pellet or rice size pieces to meet customers requirements. The denser the dry ice is, the longer it will last, the easier it is to handle, and the better it will perform when blast cleaning.

For a low cost alternative to making dry ice blocks you can even make dry ice snow yourself with a CO2 tank. Although it is not very efficient, just open the hose into a burlap bag, and then pack the dry ice snow into a container. This can be used to fill coolers, quick freeze food products before shipment, science projects, and many of the same uses as traditional higher density blocks of dry ice without the expensive hydraulics and capitol costs of a large dry ice maker. It will also save on storage loss through sublimation as it is only used when immediately needed.

Придётся договариваться с морожницами благо рядом со мной их аж три штуки

А как правильно сделать испаритель для проца и видяхи?