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US 2008/0184717 A1Published application
Transcritical Refrigeration With Pressure Addition Relief Valve
AssigneeCarrier Commercial Refrigeration, Inc.
InventorsTobias H. Sienel, Yu Chen, Hans-Joachim Huff, Parmesh Verma
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Abstract
A refrigeration system (20) includes a pressure addition relief valve (62) in parallel with an expansion device (63).
Claims19
A cooler system comprising:
- a compressor (22) for driving a refrigerant along a flow path in at least a first mode of system operation;
- a first heat exchanger (24) along the flow path downstream of the compressor in the first mode so as to act as a gas cooler;
- a second heat exchanger (28) along the flow path upstream of the compressor in the first mode so as to act as an evaporator to cool contents of an interior volume of the system;
- an expansion device (63) in the flow path downstream of the first heat exchanger (24) and upstream of the second heat exchanger (28);
- and
- a pressure addition relief valve (62) in parallel with the expansion device.
3 more elements
A transcritical CO2 refrigeration system comprising:
- a compressor (22) for driving a refrigerant along a flow path in at least a first mode of system operation;
- a first heat exchanger (24) along the flow path downstream of the compressor in the first mode so as to act as a gas cooler;
- a second heat exchanger (28) along the flow path upstream of the compressor in the first mode so as to act as an evaporator;
- an expansion device (63) in the flow path downstream of the first heat exchanger (24) and upstream of the second heat exchanger (28);
- and
- a pressure addition relief valve (62) in parallel with the expansion device.
3 more elements
A method for operating a transcritical CO2 refrigeration system comprising:
- compressing and driving a refrigerant along a flow path in at least a first mode of system operation;
- cooling the compressed refrigerant along the flow path downstream of the compressing;
- expanding the cooled refrigerant;
- and
- heating the expanded refrigerant;
- wherein:
- the expanding comprises a mechanically automated varying of an effective flow restriction based upon an additive combination of forces from pressures respectively upstream and downstream of the restriction.
4 more elements
A method for remanufacturing a transcritical CO2 refrigeration system or reengineering a configuration thereof wherein a baseline configuration comprises:
- a compressor (22) for driving a refrigerant along a flow path in at least a first mode of system operation;
- a first heat exchanger (24) along the flow path downstream of the compressor in the first mode so as to act as a gas cooler;
- a second heat exchanger (28) along the flow path upstream of the compressor in the first mode so as to act as an evaporator;
- and
- an expansion device (26) in the flow path downstream of the first heat exchanger (24) and upstream of the second heat exchanger (28),
- the method comprising at least one of:
- adding a pressure addition relief valve (62) in parallel with the expansion device (26);
- and
- replacing the expansion device (26) with a pressure addition relief valve (62) and a structurally different expansion device (63).
6 more elements
Dependencies are inferred from the claim text.