Patent ID: 8800162
Filing Date: 2014-08-12
Classification: F26B

Abstract:
1. Method for monitoring and/or controlling a freeze drying process in a freeze dryer apparatus provided with a drying chamber having a temperature-controlled shelf supporting containers of a product to be dried, said drying chamber being connected to a condenser chamber, comprising during a primary drying phase of said freeze drying process the steps of: isolating, for a time period, said drying chamber from said condenser chamber by closing an isolating valve thereof and sensing and collecting pressure values (p calculating a product temperature (T) of product and a plurality of process/product related parameters (Step wherein said calculating said product temperature and said plurality of process/product related parameters is made by means of an estimator algorithm, which implements an unsteady state model for mass transfer in said drying chamber and for heat transfer in the product, and comprises the following equations: and the parameters in the equations are: [t 0 , t f ] is the interval of Step 1 ; I.C. are initial conditions, B.C are boundary conditions.