Carrier Corporation

Hellmann, Sascha

Sascha Hellmann

Hans-Joachim Huff

Nicolas Pondicq-Cassou

Christian Scheumann

Alexander Tambovtsev

Nicolas Pondicq Cassou

Christoph Kren

Zeshi Gao

Giulio Mancuso

Barnabe Landron

Micael Antonsson

Philippe Gastaldi

Hans Micael Antonsson

Yunhai Gao

An ejector refrigeration circuitincluding: a two-phase circuitincluding: a heat rejection heat exchangerincluding an inletand an outlet; and an ejectorincluding a high pressure inlet, a low pressure inletand an outlet; the ejector high pressure inletis coupled to the heat rejection heat exchanger outlet; and an evaporatorincluding an inletand an outlet; the outletof the evaporatoris coupled to the low pressure inletof the ejector; and the ejector refrigeration circuitfurther including a vapour quality sensorpositioned at the outletof the heat rejection heat exchanger

Ejector refrigeration circuit

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.

Refrigeration system with multiple heat absorbing heat exchangers

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

Refrigeration circuit

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.

A refrigeration system () has A) an ejector circuit () comprising: Aa) a high pressure compressor unit () comprising at least one compressor (); Ab) a heat rejecting heat exchanger/gas cooler (); Ac) an ejector (); Ad) a receiver () having a gas outlet () which is connected to an inlet of the high pressure compressor unit (). B) a normal cooling temperature flowpath () comprising in the direction of flow of the refrigerant: Ba) a normal cooling temperature expansion device () fluidly connected to a liquid outlet () of the receiver (); Bb) a normal cooling temperature evaporator (); Bc) an ejector secondary inlet line () with an ejector inlet valve () fluidly connecting an outlet () of the normal cooling temperature evaporator () to a suction inlet () of the ejector (); and Bd) a normal cooling temperature flowpath valve unit () configured for fluidly connecting the inlet of the high pressure compressor unit () selectively either to the gas outlet () of the receiver () or to the outlet () of the normal cooling temperature evaporator (); C) a freezing temperature flowpath () comprising in the direction of flow of the refrigerant: Ca) a freezing temperature expansion device () fluidly connected to the liquid outlet () of the receiver (); Cb) a freezing temperature evaporator (); Cc) a freezing temperature compressor unit () comprising at least one freezing temperature compressor (); and Cd) a freezing temperature flowpath valve unit () configured for fluidly connecting the outlet of the freezing temperature compressor unit () selectively either to the inlet of the high pressure compressor unit () or to the ejector inlet valve ().

Refrigeration system

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 () 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.

A refrigeration cycle () comprises in the direction of flow of a circulating refrigerant: a compressor unit (); an oil separation device () which is configured for separating oil from an refrigerant-oil-mixture leaving the compressor unit (); at least one gas cooler/condenser (); and at least one evaporator () having an expansion device () connected upstream thereof. The oil separation device () comprises: a refrigerant inlet line connected to the compressor unit (), the refrigerant inlet line having at least a first portion () with a first diameter (d); a refrigerant conduit arranged downstream of and connected to the refrigerant inlet line, the refrigerant conduit having at least a second portion () with a second diameter (d), which is larger than the first diameter (d); a refrigerant outlet line arranged downstream of and connected to the refrigerant conduit, the refrigerant outlet line having at least a third portion () with a third diameter (d), which is smaller than the second diameter (d); and an oil suction line () having an inlet portion () which opens into the second portion () and is configured for sucking oil from the second portion (). The third portion () having the third diameter (d) extends into the second portion () forming an oil separation pocket () between the outer diameter of the third portion () and the inner diameter of the second portion ().

Refrigeration circuit with oil separation

A cooling system comprises a refrigeration circuit () circulating a refrigerant and comprising in the flow direction of the refrigerant at least one compressor (); at least one condenser (); at least one expansion device (); and at least one evaporator () for providing a cooling capacity. The cooling system further comprises a subcooling circuit () for subcooling the refrigerant circulating in the refrigeration circuit (), the subcooling circuit () being configured to circulate a subcooling refrigerant and comprising at least one subcooler compressor (); at least one heat exchange means () being arranged downstream of the at least one condenser () and being configured for heat exchange between the refrigeration circuit () and the subcooling circuit (), the at least one heat exchange means () comprising at least one temperature sensor; and a control unit () which is configured for controlling at least one compressor () of the refrigeration circuit () and at least one subcooler compressor () of the subcooling circuit () such that the cooling capacity to be provided by the at least one evaporator () is met and such that the temperature at the at least one heat exchange means () measured by at least one temperature sensor is in a predetermined range.

Cooling system

An oil separation device () for separating oil from a refrigerant-oil-mixture in a refrigeration cycle (), the oil separation device () comprises a first refrigerant conduit having at least a first portion () with a first diameter (d); 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 (d) being smaller than the first diameter (d); wherein the second portion () of the second refrigerant conduit having the second diameter (d) extends into the first portion () of the first refrigerant conduit forming an oil separation pocket () between the outer diameter of the second portion () and the inner diameter of the first portion (); and a suction line () having an inlet end (), which opens into the oil separation pocket () and is configured to suck oil from the oil separation pocket ().

Oil compensation in a refrigeration circuit

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

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Mainz-Kostheim, Germany

Sascha Hellmann