Abstract: A system for map-interpolation based control of ejectors in an ejector refrigeration circuit includes a controller coupled to each of the ejectors and adapted to generate maps based on predefined conditions. The controller identifies a first map associated with a first temperature of a heat rejecting heat exchanger and a second map associated with a second temperature of the heat rejecting heat exchanger. The controller predicts an opening percentage of the first ejector from at least one of opening percentages indicated in the first map and opening percentages indicated in the second map. Finally, the controller adjusts the opening percentage of the first ejector based on the predicted opening percentage.

Abstract: A system for detection and correction of reverse flow in an ejector refrigeration circuit, includes ejectors, first sensors for measuring an ejector suction superheat of a refrigerant at a secondary low pressure input port of each of the ejectors, and a second sensor for measuring a superheat of the refrigerant upstream relative to the secondary low pressure input port. A controller receives the ejector suction superheats and the refrigerant superheat and determines whether a superheat difference between each of the ejector suction superheats and the refrigerant superheat falls below a threshold superheat difference. The controller identifies a first ejector as a reverse flow affected ejector based on the determined superheat difference. The controller compares opening percentages of the ejectors to determine a second ejector having the largest opening percentage and controls the first ejector and the second ejector to increase a refrigerant flow rate of the first ejector.

Abstract: A system for controlling a plurality of ejectors in an ejector refrigeration circuit includes the plurality of ejectors and a controller. Each of the plurality of ejectors include a primary high pressure input port, a secondary low pressure input port, and an output port. The controller is coupled to each of the plurality of ejectors and adapted to generate a plurality of maps based on a set of predefined conditions. Each of the plurality of maps is associated with a corresponding temperature of a heat rejecting heat exchanger. The controller identifies a first map from the plurality of maps associated with a first temperature of the heat rejecting heat exchanger and an input signal from a first ejector indicative of a flow rate of a refrigerant fluid through the first ejector. Finally, the controller adjusts opening percentages of the plurality of ejectors based on the identified first map.

Abstract: An ejector refrigeration circuit 1 including: a two-phase circuit 2 including: a heat rejection heat exchanger 12 including an inlet 12a and an outlet 12b; and an ejector 14 including a high pressure inlet 14a, a low pressure inlet 14b and an outlet 14c; the ejector high pressure inlet 14a is coupled to the heat rejection heat exchanger outlet 12b; and an evaporator 18 including an inlet 18a and an outlet 18b; the outlet 18b of the evaporator 18 is coupled to the low pressure inlet 14b of the ejector 14; and the ejector refrigeration circuit 1 further including a vapour quality sensor 20 positioned at the outlet 12b of the heat rejection heat exchanger 12.

Abstract: A Stirling refrigeration system is disclosed that comprises a Stirling unit having a hot end and a cold end. In addition, the Stirling refrigeration system includes a hot heat exchanger fluidically coupled to the hot end and configured to release the heat form the hot end, wherein the hot heat exchanger and the hot end define a hot circuit for a first refrigerant to flow therein. Further, the Stirling refrigeration system includes a cold heat exchanger fluidically coupled to the cold end and configured to remove the heat from the cold end, wherein the cold heat exchanger and the cold end define a cold circuit for a second refrigerant to flow therein. One of the first refrigerant and the second refrigerant comprises a two-phase low GWP refrigerant.

Abstract: A refrigeration circuit with thermal storage is disclosed. The circuit refrigeration comprises a gas-cooler comprising an inlet, and an outlet, and a compressor unit comprising one or more compressors. The outlet of the compressor unit is fluidically connected to the inlet of the gas-cooler. The refrigeration circuit comprises evaporators comprising an inlet, and an outlet, where the outlet of the evaporators is fluidically coupled to the inlet of the compressor unit. The refrigeration circuit comprises a flash tank fluidically connected between the gas-cooler and the compressor unit, and the evaporators and the compressor unit. Further, the circuit refrigeration comprises a thermal battery fluidically coupled to the gas-cooler, the flash tank, the compressor unit, and the evaporators. The thermal battery is used as a heat source and a heat sink based on the energy pricing of an electric grid to optimize the operation of the gas-cooler, evaporators, and the compressors.

Abstract: Refrigeration systems are described. The systems include a compression device, a heat rejecting heat exchanger, an ejector, and first and second expansion devices with respective heat absorbing heat exchangers. The ejector is arranged to receive refrigerant fluid from the heat rejecting heat exchanger at a high pressure inlet of the ejector. Fluid pathways extend from an outlet of the ejector into a branched flow path to provide flows of refrigerant from the ejector to the first and second expansion devices. The first heat absorbing heat exchanger provides cooling at a first temperature and refrigerant fluid from the outlet of the first heat absorbing heat exchanger is directed to a low pressure inlet of the ejector. The second heat absorbing heat exchanger provides cooling at a second temperature and refrigerant fluid from the outlet of the second heat absorbing heat exchanger is directed to the inlet of the compression device.

Abstract: Refrigeration circuit (1a) comprising in the direction of flow of a circulating refrigerant: a compressor unit (2) comprising at least one compressor (2a, 2b, 2c); a heat rejecting heat exchanger/gas cooler (4); a high pressure expansion device (6); a receiver (8); an expansion device (10); an evaporator (12); and a low pressure gas-liquid-separation unit comprising at least two collecting containers (32, 34) which are configured for alternately separating a liquid phase portion from the refrigerant leaving the evaporator (12) and delivering the separated liquid refrigerant back to the receiver (8).

Abstract: An ejector refrigeration circuit 1 including: a two-phase circuit 2 including: a heat rejection heat exchanger 12 including an inlet 12a and an outlet 12b; and an ejector 14 including a high pressure inlet 14a, a low pressure inlet 14b and an outlet 14c; the ejector high pressure inlet 14a is coupled to the heat rejection heat exchanger outlet 12b; and an evaporator 18 including an inlet 18a and an outlet 18b; the outlet 18b of the evaporator 18 is coupled to the low pressure inlet 14b of the ejector 14; and the ejector refrigeration circuit 1 further including a vapour quality sensor 20 positioned at the outlet 12b of the heat rejection heat exchanger 12.

Abstract: Refrigeration systems are described. The systems include a compression device, a heat rejecting heat exchanger, an ejector, and first and second expansion devices with respective heat absorbing heat exchangers. The ejector is arranged to receive refrigerant fluid from the heat rejecting heat exchanger at a high pressure inlet of the ejector. Fluid pathways extend from an outlet of the ejector into a branched flow path to provide flows of refrigerant from the ejector to the first and second expansion devices. The first heat absorbing heat exchanger provides cooling at a first temperature and refrigerant fluid from the outlet of the first heat absorbing heat exchanger is directed to a low pressure inlet of the ejector. The second heat absorbing heat exchanger provides cooling at a second temperature and refrigerant fluid from the outlet of the second heat absorbing heat exchanger is directed to the inlet of the compression device.

Abstract: An ejector refrigeration circuit comprises: a high pressure ejector circuit comprising in the direction of flow of a circulating refrigerant: a heat rejecting heat exchanger/gas cooler having an inlet side and an outlet side; at least one ejector comprising a primary high pressure input port, a secondary low pressure input port, and an output port, the primary high pressure input port being fluidly connected to the outlet side of the heat rejecting heat exchanger/gas cooler; a receiver, having a liquid outlet, a gas outlet and an inlet, which is fluidly connected to the output port of the at least one ejector; at least one compressor having an inlet side and an outlet side, the inlet side of the at least one compressor being fluidly connected to gas outlet of the receiver.

Abstract: Cooling circuit section (2), intended for the circulation of a refrigerant, said cooling circuit section (2) comprising:—at least two compressor assemblies (30), fluidically connected in parallel, each compressor assembly (30) comprising:—a compressor (40) configured to receive a low-pressure refrigerant having a first pressure, and for increasing the pressure of the low-pressure refrigerant so as to produce a compressed refrigerant having a second pressure that is greater than the first pressure, the compressed refrigerant comprising oil,—an individual oil separator (42) comprising an inlet (58) fluidically connected to the compressor (40) so as to receive the compressed refrigerant from the compressor (40), each individual oil separator (42) being configured to separate a first fraction of oil from the compressed refrigerant, the cooling circuit section (2) further comprising a common oil separator (32).

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: An ejector refrigeration circuit comprises a high pressure ejector circuit comprising in the direction of flow of a circulating refrigerant: a heat rejecting heat exchanger/gas cooler having an inlet side and an outlet side; at least two variable ejectors (6, 7) with different capacities connected in parallel, each of the variable ejectors comprising a primary high pressure input port, a secondary low pressure input port and an output port; wherein the primary high pressure input ports of the at least two variable ejectors are fluidly connected to the outlet side of the heat rejecting heat exchanger/gas cooler; a receiver, having an inlet, a liquid outlet, and a gas outlet, wherein the inlet is fluidly connected to the output ports of the at least two variable ejectors; at least one compressor having an inlet side and an outlet side.

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 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: Refrigeration circuit (1a) comprising in the direction of flow of a circulating refrigerant: a compressor unit (2) comprising at least one compressor (2a, 2b, 2c); a heat rejecting heat exchanger/gas cooler (4); a high pressure expansion device (6); a receiver (8); an expansion device (10); an evaporator (12); and a low pressure gas-liquid-separation unit comprising at least two collecting containers (32, 34) which are configured for alternately separating a liquid phase portion from the refrigerant leaving the evaporator (12) and delivering the separated liquid refrigerant back to the receiver (8).

Abstract: An ejector refrigeration circuit (1) comprises a high pressure ejector circuit (3) comprising in the direction of flow of a circulating refrigerant: a heat rejecting heat exchanger/gas cooler (4) having an inlet side (4a) and an outlet side (4b); at least two variable ejectors (6, 7) with different capacities connected in parallel, each of the variable ejectors (6, 7) comprising a primary high pressure input port (6a, 7a), a secondary low pressure input port (6b, 7b) and an output port (6c, 7c); wherein the primary high pressure input ports (6a, 7a) of the at least two variable ejectors (6, 7) are fluidly connected to the outlet side (4b) of the heat rejecting heat exchanger/gas cooler (4); a receiver (8), having an inlet (8a), a liquid outlet (8c), and a gas outlet (8b), wherein the inlet (8a) is fluidly connected to the output ports (6c, 7c) of the at least two variable ejectors (6, 7); at least one compressor (2a, 2b, 2c) having an inlet side (21a, 21 b, 21c) and an outlet side (22a, 22b, 22c), the inlet s

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: An ejector refrigeration circuit comprises: a high pressure ejector circuit comprising in the direction of flow of a circulating refrigerant: a heat rejecting heat exchanger/gas cooler having an inlet side and an outlet side; at least one ejector comprising a primary high pressure input port, a secondary low pressure input port, and an output port, the primary high pressure input port being fluidly connected to the outlet side of the heat rejecting heat exchanger/gas cooler; a receiver, having a liquid outlet, a gas outlet and an inlet, which is fluidly connected to the output port of the at least one ejector; at least one compressor having an inlet side and an outlet side, the inlet side of the at least one compressor being fluidly connected to gas outlet of the receiver.