Refrigeration system

A refrigeration system, comprising:

• a refrigerant circuit (20) configured to perform a refrigeration cycle and including a compressor (21) having a variable capacity, a plurality of evaporators (27), and expansion mechanisms (26) respectively associated with the evaporators (27);
• a capacity adjustment unit (6) configured to adjust the capacity of the compressor (21) such that an evaporation temperature Te of a refrigerant circulating in the refrigerant circuit (20) approaches a predetermined set temperature Tem;
• a pressure-reduction-amount adjustment unit (9) configured to adjust an amount of pressure reduction of a refrigerant passing through each of the expansion mechanisms (26) such that a refrigerant outlet superheat degree SH of an associated one of the evaporators (27) approaches a target superheat degree SHs determined based on an amount of heat exchange necessary for the evaporator (27);
• and
• a change unit (5) configured to change the set temperature Tem to a value larger than a current value when a lowest one of target superheat degrees SHs determined for the respective evaporators (27) is higher than a predetermined value SHt.