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ALASKA LN2 for freeze-drying: an alternative to using conventional coolants (CFC, HCFC) which contribute to the destruction of the ozone layer. Liquid nitrogen has a higher cooling capacity and makes it possible to improve freeze dryer performance, by reducing cycle times.
ALASKA LN2 for freeze-drying is the Air Liquide solution for providing the cooling capacity required by a freeze dryer. Operating principle:
Liquid nitrogen is stored in liquid form at a temperature of -196°C.
It is injected
into the ALASKA exchanger to cool a silicone oil to the desired freezing temperature, typically – 40°C.
into the winding to trap water vapor in the form of ice. The trap temperature can vary between -60°C and -80°C.
The gaseous nitrogen is returned to the atmosphere via a vent
A simple and reliable system:
5 components forming the system:
The LN2 tank
The vacuum-insulated LN2 transfer line
The ALASKA exchanger
The trap windings
The temperature regulation system and the LN2 operating tools supplied with the ALASKA exchanger
An economical solution:
System reliability due to absence of rotating machines
Maintenance and operating costs
Freeze-dried product quality
Productivity gain due to cycle time reduction
ALASKA LN2 is a suitable and economical solution, compared to conventional mechanical cooling systems
An exchanger range from 5 to 100 kW with the possibility to manufacture higher-capacity equipment if required.
Nominal cooling power (kW)
COMPARISON WITH MECHANICAL COOLING UNITS: ALASKA LN2 offers the following advantages:
Lower maintenance and no specific expertise required,
Compact size, no noise pollution
Suppression of use of gases that destroy the ozone layer
No regulatory constraints
Easy operation due to the flexibility of the system
Greater reliability and reproducibility of freeze-drying cycles
Greater cooling capacity than conventional systems, which is constant throughout the temperature range and instantaneously available.
Cycle time reduction
Possibility to reach very low temperatures for specific recipes
LOW OPERATING COST - No electricity
No backup generator
No cooling water
Lower maintenance costs
Lower number of shutdowns due to failure.
Main technical characteristics
Specific liquid nitrogen exchangers
Large heat exchange surface area
Insulation making it possible to limit heat losses