(57) A refrigeration plant comprising a refrigerant circuit (10) including a first pump
(12), a first heat consumer (11, 14), at least two secondary heat exchangers (31-33)
which are connected in parallel across conducting parts (10a, 10b) of the circuit
(10) said parts (10a, 10b) being connecting to the heat consumer (11) and functioning
to cool a respective heat emitting unit (51-53, 51'-53') which is through-passed by
refrigerant and which belongs to at least one refrigeration plant (41';41-43), such
as a refrigerator or freezer. The pumps (12 21) are adapted to drive the refrigerant
in mutually opposite directions such that the circuit will obtain a low pressure side
(10a) and a high pressure side (10b). The plant also includes a pressure difference
sensor (22) which detects the pressure difference between the low pressure side (10a)
and the high pressure side (10b). The second pump (21) is adapted to deliver a generally
constant flow of refrigerant. A shunt line (60) is established between the high pressure
side (10b) and the low pressure side (10a) and contains a device (61) for controlling
the flow of refrigerant through the shunt line (60), wherein the flow controlling
device (61) is controlled by the pressure difference sensor so as to maintain a generally
constant pressure difference between the high pressure side (10b) and the low pressure
side (10a).
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