The symposium participants besides the new system.

Space-saving design and low energy consumption

Dürr Somac’s new R744 filling process offers clear advantages

Chemnitz/Stollberg, April 2014 – Experts believe that R744 (CO2) will become the new refrigerant of choice in air conditioning systems over the next few years. Dürr Somac is introducing a new filling process for this environmentally friendly refrigerant. It requires no cooling and consumes less energy than other systems, thus reducing investment and life-cycle costs.

R744 has special properties: depending on pressure and temperature, this refrigerant can be liquid, gaseous or solid (dry ice). It is only liquid below a temperature of 31°C.

In previous filling processes, the R744 had to be cooled to around 25°C in the system so the liquid could be fed into the vehicle. This required insulated ring pipes for the supply along with a cooling system, which led to high energy consumption and space usage.

With its new multi-phase filling process, Dürr Somac is increasing the temperature range to up to 45°C. In this process, the R744 is fed into the system at a pressure of around 95 bar, independently of the temperature, in a liquid or supercritical state. Dispensing with the need for cooling reduces the initial investment for the filling system as well as its energy consumption. This in turn lowers the system's life-cycle costs. Instead of the insulated ring pipe, the R744 only requires a normal supply pipe.

Dürr Somac first introduced the multi-phase filling process at its symposium entitled “Alternative Refrigerant R744” held in Chemnitz on February 13, 2014. The event was attended by more than 70 system, supply and process planners as well as safety experts and buyers from leading European OEMs. Aside from the new filling system, there were well-known external speakers who explained the basic properties of R744 and the added lubricants, and talked about safety requirements and supply concepts.

At the symposium, Dürr Somac presented its first system from the CompStart series with the multi-phase filling process for R744. It is initially intended for use in pilot projects. The line filling systems for R744 will be launched towards the end of the year.

Your contact: Carsten Wöhner

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