(57) A multi-user refrigeration plant comprises portions (2, 3, 44) assigned to serve
at least two different type of users selected among first normal cooling users TN,
second environmental conditioning users AC and third cooling users BT. The multi-user
refrigeration plant (1) is equipped with at least a first compressors set (4) whose
outlet are mutually interconnected (8), and it (1) is also equipped with at least
switch means first (11) and second (12), a condenser means (5), a liquid receiver
means (9), a plurality of valve means and a plurality of connecting means wherein
said elements and means cooperate to compose the circuit of the plant for the in it
circulating cooling fluid state change. Said first user plant portion (2) includes
a first evaporator means (6), said second user plant portion (3) includes a heat exchanger
(7), said third user plant portion (44) includes a evaporator means (42), this latter
(42) is connected to the remaining part of the circuit by means of a second cooling
stage (40). Said plant (1) comprises a balancing means (13), controlled by control
means that controls also the switch means (11, 12), and it comprises a fluid flow
regulation valve (35) interconnected between a bleed connector connected immediately
downstream of the outlet interconnection (8) of the compressor set (4) and a mixing
means (15) inlet and it comprises a controlled expanding valve (36) interposed between
a receivers means (9) outlet and an additional mixing means (15) inlet having an outlet
(32) connected at the compressor set (4) common suction inlet (17).
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