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6. Freeze-dryer refrigeration systems
Freeze-drying is a drying process based on the principle of sublimating the ice from a frozen product: the water in the product passes directly from the solid state to the vapor state. The water-free product thus obtained is assured of a long shelf-life, without the need for a refrigeration system.
This process is applied to pharmaceutical products, foodstuffs of all kinds, and cultural property polluted by floods, but above all it is the only process that preserves the distinctive aroma of coffee powder.
The complete operation consists of three stages, which take place inside a sealed chamber. The times quoted are average industrial values:
freeze the product in a thin layer on trays for 1 to 3 hours, depending on its type;
the chamber is evacuated and the...
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Freeze-dryer refrigeration systems
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Statistical and economic data
All these data were supplied by UNICLIMA.
Air conditioning – Refrigeration
In 2007, UNICLIMA companies saw their business grow by +5.7% compared to 2006. Business is therefore growing strongly on both the domestic and export markets.
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Standards and norms
ISO international standards
- Systèmes frigorifiques mécaniques utilisés pour le refroidissement et le chauffage. Prescriptions de sécurité - ISO 5149 -
- Compresseurs pour fluides frigorigènes. Présentation des performances - ISO 9309 -
- Sécurité et exigences environnementales des systèmes de réfrigération - TC 86/SC 1 -
- Termes et définitions - TC 86/SC 2 -
- Essais et point nominal...
Regulations
Pressure equipment regulations
In the past, it was defined by a decree of 1943, subsequently revised in 1960. As part of the harmonization of technical regulations, the European Union has issued a Pressure Equipment Directive (PED) (no. 97/23), which becomes the only rule in force in each member state; for France, the transcription is the subject of a decree and order no. 99-1046 of 13/12/1999.
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