FIELD: refrigeration equipment.
SUBSTANCE: installation contains primary cooling circuit (C1), which contains condenser (COND1), at least one compressor (COMP1), and first evaporator (EV1); secondary cooling circuit (C2), which contains heat-insulated chamber (5), second evaporator (EV2) enclosed in mentioned heat-insulated chamber (5), air inlet (IN), and air outlet (OUT) with controlled opening/closing through the mentioned chamber, and fan (VENT2) placed with the possibility of creation of air circulation between the mentioned air inlet and the mentioned air outlet; PLC (20) made with the possibility of selection of an operating mode of the cooling installation from operating mode (MOD1), in which primary cooling circuit (C1) is active for cooling air present in an internal volume, and secondary cooling circuit (C2) charges its second evaporator (EV2) with cooling power, and second operating mode (MOD2), in which primary cooling circuit (C1) and secondary cooling circuit (C2) are simultaneously active for cooling air present in the mentioned internal volume. PLC is made with the possibility of acting as a module for selection of mentioned operating mode (MOD1), taking into account: dissipated heat power (Pth_D) in the internal volume of an electrical casing; heat power (Pth_EV1) of cooling, which first evaporator (EV1) is able to dissipate. First operating mode (MOD1) is selected by the mentioned PLC, when dissipated heat power (Pth_D) in the electrical casing is less than or equal to heat power (Pth_EV1), which the first evaporator is able to dissipate. Second operating mode (MOD2) is selected by PLC, when dissipated heat power (Pth_D) in the electrical casing is strictly greater than heat power (Pth_EV1), which the first evaporator is able to dissipate. The cooling installation contains a switching device adapted to switch the cooling installation between first operating mode (MOD1) and second operating mode (MOD2). PLC is made with the possibility of acting as a module for control of the mentioned switching device, taking into account the selected operating mode. The switching device is made with the possibility of connection of the secondary cooling circuit to the primary cooling circuit and maintenance of mentioned heat-insulated chamber (5) closed in the first operating mode.
EFFECT: energy losses are reduced.
10 cl, 7 dwg
