A refrigerating system comprising a compressor, a condenser, an expansion valve, an evaporator and a reservoir for a refrigerant, the compressor ensuring circulating of a refrigerant, the condenser being cooled by a cooling medium circulating in a sink circuit, the evaporator cooling the medium of a source circuit, a liquid refrigerant line connecting the condenser to the expansion valve, the evaporator being placed downstream of the expansion valve and upstream of the compressor, the refrigerating system ensuring heat transfer of the medium to be cooled circulating in the source circuit from the evaporator to the sink circuit for cooling the condenser, the reservoir being installed on a line connected in parallel to the liquid refrigerant line which directly connects the condenser to the expansion valve, characterised in that a temperature meter is configured to measure the inlet temperature of the medium to be cooled on the source circuit at the inlet of the evaporator, a temperature meter is configured to measure the outlet temperature of the medium to be cooled at the outlet of the evaporator, the compressor being provided with a power controller, the expansion valve having control electronics configured to take the measurement of the evaporating pressure by a pressure meter into account, the refrigerating system comprising supervision and control electronics, the refrigerating system being designed to operate according to two situations: - a situation of increase in the refrigeration demand on the source circuit, manifested by a temperature at the inlet of the evaporator, measured by the meter, higher than in the previous time step, the refrigeration power supplied by the system having not changed, the temperature measured at the outlet of the evaporator rising, the electronics of the power controller increasing the refrigerant sucked flow rate, the evaporation pressure measured by the meter decreasing, the control electronics of the expansion valve receiving this signal to increase the liquid flow rate at the inlet of the expansion valve, the supervision electronics controlling the increase in the circulating mass of refrigerant; - a situation of decrease in the cooling power required by the source circuit, manifested by a temperature at the inlet of the evaporator, measured by the meter, lower than in the previous time step, the cooling power supplied by the system having not changed, the decrease in the temperature measured on the source circuit at the outlet of the evaporator and the decrease in the outlet temperature of the refrigerant of the evaporator being processed by the electronics of the power controller of the compressor, which decreases the flow rate of the sucked refrigerant, and by the control electronics of the expansion valve which reduces the liquid flow rate at the inlet of the expansion valve, the supervision electronics controlling the reduction in the circulating mass of refrigerant. - a situation of increase in the refrigeration demand on the source circuit, manifested by a temperature at the inlet of the evaporator, measured by the meter, higher than in the previous time step, the refrigeration power supplied by the system having not changed, the temperature measured at the outlet of the evaporator rising, the electronics of the power controller increasing the refrigerant sucked flow rate, the evaporation pressure measured by the meter decreasing, the control electronics of the expansion valve receiving this signal to increase the liquid flow rate at the inlet of the expansion valve, the supervision electronics controlling the increase in the circulating mass of refrigerant; - a situation of decrease in the cooling power required by the source circuit, manifested by a temperature at the inlet of the evaporator, measured by the meter, lower than in the previous time step, the cooling power supplied by the system having not changed, the decrease in the temperature measured on the source circuit at the outlet of the evaporator and the decrease in the outlet temperature of the refrigerant of the evaporator being processed by the electronics of the power controller of the compressor, which decreases the flow rate of the sucked refrigerant, and by the control electronics of the expansion valve which reduces the liquid flow rate at the inlet of the expansion valve, the supervision electronics controlling the reduction in the circulating mass of refrigerant.