Cold gas systems

Variants

What is cold gas

KALTGAS is a temperature control system based on the low temperature of liquid nitrogen as a refrigerant. The liquid nitrogen is vaporized in a cryogenic tank by means of a heater (jet). This generates a constant, cryogenic gas flow. By varying the heater (jet), both the cooling capacity and the gas flow volume can be changed, and the liquid nitrogen consumption can be reduced to the necessary minimum by varying the jet output. The cryogenic gas flow is then fed through a vacuum-insulated, flexible metal pipe to the object to be cooled. A KALTGAS system can generate a cold gas flow of up to -180°C within a few minutes.

In most cases, this KALTGAS system is only used to generate the cold gas flow. This gas flow can be controlled in terms of volume via a regulator. Since such a controlled system operates without counter-heating, temperature stabilization is virtually impossible.

In order to achieve good temperature and control stability, a reheating module (heat exchanger) must be used. This can be connected directly to the hose, or it can be installed in a chamber in the immediate vicinity of the cold gas flow.

The heat exchanger has the task of heating the cold gas flow to the desired temperature. This means that a predefined gas flow with a predefined temperature is available as a coolant at the outlet of the heat exchanger. The SC5 safety controller achieves temperature stabilities of less than ± 0.2°C in the controlled state. In addition to the high cooling speed, the modular design is another advantage of KALTGAS systems. By replacing individual components such as the N2 gas line, the jet or the heater, the cooling rate or the LN2 consumption as well as the type of use can be changed. The basic modules such as the LN2 tank, vacuum pump or temperature control remain unchanged.

Application examples

• Thermal testing of plastics, metals, composites, etc.
• Cooling of electronic components
• Deep freezing of sample chambers
• Shock freezing of biological samples, foodstuffs, other materials
• Tempering of test samples at
  • Tensile or torsion test
  • Notched bar impact tests
  • chemical or physical experiments
  • Process engineering processes

Example curve

Software for controlling cold gas systems