Method for distributing a mixture in a gaseous state

A method for distributing a single-phase mixture from a source (12) to an enclosure (6), the method comprising the following steps:

• a) providing a source (12) of a single-phase mixture in a gas or supercritical phase, the single-phase mixture comprising, a dielectric insulator;
• b) transferring the single-phase mixture from the source (12) to the enclosure (6) via a transfer circuit (3), fluidically connecting the source (12) to the enclosure (6);
• c) heating the single-phase mixture in the transfer circuit (3) via a first heating element (4), the single-phase mixture having, upstream of the first heating element (4) in the transfer circuit (3), an inlet temperature and an inlet pressure, step c) of heating being carried out so that the temperature of the single-phase mixture, downstream of said first heating element (4), in the transfer circuit, reaches a first predetermined temperature, the first predetermined temperature being higher than the inlet temperature, step c) of heating being carried out, during step b);
• d) expanding the mixture heated in step c) via a first expansion element (8) until the pressure of the single-phase mixture downstream of the first expansion element (8) in the transfer circuit (3) is equal to a first predetermined pressure, the first predetermined pressure being, reduced, the temperature of the single-phase mixture downstream of the expansion element (8) in the transfer circuit (3) thus reaching a second temperature, the second temperature being lower than the first predetermined temperature, wherein step d) is carried out during step b);
• e) heating the single-phase mixture expanded in step d) via the second heating element (40), so that the temperature of the single-phase mixture downstream of said second heating element (40) in the transfer circuit (3) reaches a third predetermined temperature, the third predetermined temperature being higher than the second temperature, step e) being carried out during step b);
• f) expanding the single-phase mixture heated in step e), via a second expansion element (9), until the pressure of the single-phase mixture in the transfer circuit (3), downstream of the second expansion element (8), is equal to a second predetermined pressure, the second predetermined pressure being, reduced relative to the first predetermined pressure, step f) being carried out during step b);
• g) expanding the single-phase mixture expanded in step f) via a third expansion element (10) until the pressure of the single-phase mixture downstream of the third expansion element (8) in the transfer circuit (3) is equal to a third predetermined pressure, the third predetermined pressure being reduced by a value relative to the second predetermined pressure, step g) being carried out during step b).