Dynamic temperature control using CO2

Thanks to the use of gaseous media for heating and cooling processes, pollution of cooling channels is now a thing of the past. It is basically true that gaseous media have the disadvantage that they are poor heat carriers.
This applies at least to air, which is used only for cooling processes under special circumstances. But, on the contrary, if the possibilities of CO2 are exhausted properly, it offers an interesting alternative to conventional water temperature control.

Modern technological solution

CO2 cooling has been sufficiently tested and is well known. The high enthalpy of evaporation of the injected liquid at a temperature of -76°C provides extremely efficient heat exchange. As for the cooling of long and thin cores or narrow rods, CO2 cooling has been used with great success for many years. However, a new feature is that heating is also possible with the help of gaseous CO2. In vario gt, CO2 is compressed to a suitable pressure and heated near the mold cavity.
Unlike water vapor and hot steam, the medium is not critical even at high temperatures. It is not prone to deposits and corrosion and has excellent heat transfer characteristics, which makes it ideal for dynamic temperature control. The high temperature gradient between hot and cold environments is unparalleled and promises minimal cycle time.

Environmental friendliness and a wide range of applications

The positive impact on the environment is also an important advantage: the CO2 used is an extract of by-products formed as a result of chemical processes that are usually released directly into the environment. However, thanks to the new technology developed by Linde, ISK and gwk, it has been improved and thus becomes suitable for dynamic
temperature control of narrow and otherwise inaccessible sections of the mold and parts of complex geometry.
Unlike all other methods, this temperature control method does not impose any requirements on the cooling system in terms of temperature, pressure, volume flow, or water quality. Anhydrous temperature control is very well suited for use in production conditions in clean rooms.