Abstract: A refrigeration system (1) has A) an ejector circuit (3) comprising: Aa) a high pressure compressor unit (2) comprising at least one compressor (2a, 2b, 2c, 2d); Ab) a heat rejecting heat exchanger/gas cooler (4); Ac) an ejector (6); Ad) a receiver (8) having a gas outlet (8b) which is connected to an inlet of the high pressure compressor unit (2).

Abstract: A refrigeration circuit is disclosed circulating a refrigerant and comprising in the direction of flow of the refrigerant a compressor (2); at least one condenser (14, 16) for rejecting heat to ambient air; an expansion device (8); and an evaporator (10). The refrigeration circuit further comprises a collecting container (12), the output of which being connected to the expansion device (8); a heat rejecting heat exchanger (4) for heat exchange of the refrigerant to a heat pump system, the output of the heat rejecting heat exchanger (4) being connected to the collecting container (12); and means (V1, V2) for connecting the heat rejecting heat exchanger (4) or at least one of the condenser(s) (14, 16) to the output of the compressor (2) depending on the availability of cooling power at the heat rejecting heat exchanger (4).

Abstract: A refrigeration cycle (1) comprises in the direction of flow of a circulating refrigerant: a compressor unit (2); an oil separation device (4) which is configured for separating oil from an refrigerant-oil-mixture leaving the compressor unit (2); at least one gas cooler/condenser (6); and at least one evaporator (10) having an expansion device (8) connected upstream thereof.

Abstract: A refrigeration circuit (1) configured for circulating a refrigerant an comprises in the direction of flow of the refrigerant: at least one compressor (2a, 2b, 2c, 2d); at least one heat recovery heat exchanger (4); at least one gas cooler/condenser (10); at least one evaporator associated expansion device (18); at least one receiver (14); and at least one evaporator (20). The refrigeration circuit (1) further comprises a gas/liquid separator (8) having a refrigerant inlet line (7) fluidly connected to an outlet-side of the at least one heat recovery heat exchanger (4); an gaseous phase outlet line (9) fluidly connected to an inlet side of the at least one gas cooler/condenser (10); and an liquid phase outlet line (13) fluidly connected to the receiver (14).

Abstract: A cooling system comprises a refrigeration circuit (1) circulating a refrigerant and comprising in the flow direction of the refrigerant at least one compressor (2a, 2b, 2c, 2d); at least one condenser (4); at least one expansion device (8, 10); and at least one evaporator (11) for providing a cooling capacity.

Abstract: An oil separation device (14) for separating oil from a refrigerant-oil-mixture in a refrigeration cycle (1), the oil separation device (14) comprises a first refrigerant conduit having at least a first portion (16) with a first diameter (d1); a second refrigerant conduit arranged downstream of and connected to the first refrigerant conduit, the second refrigerant conduit having at least a second portion with a second diameter (d2) being smaller than the first diameter (d1); wherein the second portion (18) of the second refrigerant conduit having the second diameter (d2) extends into the first portion (16) of the first refrigerant conduit forming an oil separation pocket (32) between the outer diameter of the second portion (18) and the inner diameter of the first portion (16); and a suction line (20) having an inlet end (19), which opens into the oil separation pocket (32) and is configured to suck oil from the oil separation pocket (32).

Abstract: A refrigeration circuit is disclosed circulating a refrigerant and comprising in the direction of flow of the refrigerant a compressor (2); at least one condenser (14, 16) for rejecting heat to ambient air; an expansion device (8); and an evaporator (10). The refrigeration circuit further comprises a collecting container (12), the output of which being connected to the expansion device (8); a heat rejecting heat exchanger (4) for heat exchange of the refrigerant to a heat pump system, the output of the heat rejecting heat exchanger (4) being connected to the collecting container (12); and means (V1, V2) for connecting the heat rejecting heat exchanger (4) or at least one of the condenser(s) (14, 16) to the output of the compressor (2) depending on the availability of cooling power at the heat rejecting heat exchanger (4).