ALASKA LN2 FOR FREEZE-DRYING: Cryogenic heat exchanger [ Return towards Temperature regulation ]
Freeze-drying cycle optimization using cryogenic cooling and ALASKA range heat exchangers.
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
Range
An exchanger range from 5 to 100 kW with the possibility to manufacture higher-capacity equipment if required.
| Exchanger | CF 5 | CF 12,5 | CF 25 | CF 37,5 | CF 50 | CF 75 | CF 100 |
| Nominal cooling power (kW) | 5 | 12,5 | 25 | 37,5 | 50 | 75 | 100 |
Key benefits
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
PROCESS
- 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
- LN2 consumption optimization
- Sturdy stainless steel design
- "Ready-to-start" skid assembly
Standrads
- CE, ASME
Related products
- ALASKA HEATING AND COOLING heat regulation unit
Contacts
For further information, contact us:
South America - Northern Europe: Yannick Rouaud
Sales - Electronic market
Tel: +33 (0) 4 76 43 63 62
Southern Europe, Asia, Africa, Oceania: Pascal Tardy
Sales - Electronic market
Tel: +33 (0) 4 76 43 59 48
China: Shuang Liu
Sales - Shanghai
Tel: +86 (21) 6090 3892
Japan: Pierre Crespi
Sales - Amagasaki
Tel: +81 6 6429 3041
Danyelle Silanus
Sales department
Tel: +33 (0) 4 76 43 62 11
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