公开(公告)号：US11162724B2

公开(公告)日：2021-11-02

申请号：US16479360

申请日：2017-12-20

Applicant: Danfoss A/S

Inventor： Lars Finn Sloth Larsen ,  Jan Prins ,  Kenneth Bank Madsen

IPC: F25B49/02 ,  F25B5/02 ,  F25B41/385

Abstract: A method for controlling ejector capacity in a vapour compression system (1) is disclosed. A parameter value being representative for a flow rate of liquid refrigerant from the evaporator(s) (8, 10) and into a return pipe (12, 13) is obtained, and the capacity of the ejector(s) (6) is adjusted based on the obtained parameter value. Ejector capacity may be shifted between low pressure ejectors (liquid ejectors) (6a, 6b, 6c, 6d) and high pressure ejectors (gas ejectors) (6e, 6f).

公开(公告)号：US20220034567A1

公开(公告)日：2022-02-03

申请号：US17278738

申请日：2019-09-12

Applicant: Danfoss A/S

Inventor： Jan Prins ,  Lars Finn Sloth Larsen

IPC: F25B49/02

Abstract: A method for controlling a vapour compression system (1) including a compressor unit (2) including one or more compressors (3, 12), a heat rejecting heat exchanger (4), a receiver (6), an expansion device (7) and an evaporator (8) arranged in a refrigerant path. A pressure value indicating a pressure prevailing inside the receiver (6) is obtained, and the obtained pressure value is compared to a first threshold pressure value. In the case that the obtained pressure value is below the first threshold pressure value, the compressor(s) (3, 12) of the compressor unit (2) are controlled in order to reduce a suction pressure of the vapour compression system (1).

公开(公告)号：US20220034566A1

公开(公告)日：2022-02-03

申请号：US17278723

申请日：2019-09-13

Applicant: Danfoss A/S

Inventor： Jan Prins ,  Lars Finn Sloth Larsen

IPC: F25B49/02

Abstract: A method for controlling a vapour compression system (1) including a compressor unit (2) including at least two compressors (3, 12), a heat rejecting heat exchanger (4), a receiver (6), an expansion device (7) and an evaporator (8) arranged in a refrigerant path is disclosed. At least one of the compressors is a main compressor (3) being fluidly connected to an outlet of the evaporator (8) and at least one of the compressors is a receiver compressor (12) being fluidly connected to a gaseous outlet (10) of the receiver (6). A flow of vapour entering the receiver (6), such as a mass flow of vapour entering the receiver (6) is estimated and compared to a first threshold value. In the case that the estimated flow is above the first threshold value, a pressure prevailing inside the receiver (6) is controlled by operating the receiver compressor (12).

公开(公告)号：US20190353413A1

公开(公告)日：2019-11-21

申请号：US16479360

申请日：2017-12-20

Applicant: Danfoss A/S

Inventor： Lars Finn Sloth Larsen ,  Jan Prins ,  Kenneth Bank Madsen

IPC: F25B49/02 ,  F25B5/02

Abstract: A method for controlling ejector capacity in a vapour compression system (1) is disclosed. A parameter value being representative for a flow rate of liquid refrigerant from the evaporator(s) (8, 10) and into a return pipe (12, 13) is obtained, and the capacity of the ejector(s) (6) is adjusted based on the obtained parameter value. Ejector capacity may be shifted between low pressure ejectors (liquid ejectors) (6a, 6b, 6c, 6d) and high pressure ejectors (gas ejectors) (6e, 6f).

公开(公告)号：US12259165B2

公开(公告)日：2025-03-25

申请号：US17609876

申请日：2020-08-13

Applicant: Danfoss A/S

Inventor： Jan Prins ,  Lars Finn Sloth Larsen

IPC: F25B49/02 ,  F25B1/10 ,  F25B5/02 ,  F25B41/22

Abstract: A method for controlling a vapour compression system (1) is disclosed. The vapour compression system (1) includes an ejector (4), and has a non-return valve (11) arranged in the refrigerant path between an outlet (12) of an evaporator (7) and an inlet (10) of a compressor unit (2), in such a manner that a refrigerant flow from the outlet (12) of the evaporator (7) towards the inlet (10) of the compressor unit (2) is allowed, while a fluid flow from the inlet (10) of the compressor unit (2) towards the outlet (12) of the evaporator (7) is prevented. A pressure, P0, of refrigerant leaving the evaporator (7) is measured and a value being representative for a pressure, Psuc, of refrigerant entering the compressor unit (2) is obtained. The pressures, P0 and Psuc, are compared to respective reference pressure values, P0,ref and Psuc,ref. In the case that ε0>εsuc, where ε0=P0−P0,ref and εsuc=Psuc−Psuc,ref, the compressor unit (2) is controlled based on P0, and in the case that εsuc>ε0, the compressor unit (2) is controlled based on Psuc.

公开(公告)号：US11841174B2

公开(公告)日：2023-12-12

申请号：US17479014

申请日：2021-09-20

Applicant: Danfoss A/S

Inventor： Lars Finn Sloth Larsen ,  Jan Prins ,  Kenneth Bank Madsen

IPC: F25B1/10 ,  F25B5/02 ,  F25B49/02 ,  F25B41/385 ,  F25B41/20

CPC classification number: F25B1/10 ,  F25B5/02 ,  F25B41/20 ,  F25B41/385 ,  F25B49/02 ,  F25B2341/0012 ,  F25B2341/0013 ,  F25B2341/0015 ,  F25B2400/0407

Abstract: A method for controlling ejector capacity in a vapour compression system (1) is disclosed. A parameter value being representative for a flow rate of liquid refrigerant from the evaporator(s) (8, 10) and into a return pipe (12, 13) is obtained, and the capacity of the ejector(s) (6) is adjusted based on the obtained parameter value. Ejector capacity may be shifted between low pressure ejectors (liquid ejectors) (6a, 6b, 6c, 6d) and high pressure ejectors (gas ejectors) (6e, 6f).

公开(公告)号：US11162727B2

公开(公告)日：2021-11-02

申请号：US16608311

申请日：2018-04-25

Applicant: Danfoss A/S

Inventor： Lars Finn Sloth Larsen ,  Jan Prins ,  Torben Green

IPC: F25B49/02 ,  F25B5/02

Abstract: A method for controlling suction pressure in a vapour compression system including one or more cooling entities is disclosed. For each cooling entity, a maximum required suction pressure and/or a required change in suction pressure for maintaining a target temperature in the refrigerated volume is obtained. A most loaded cooling entity among the one or more cooling entities is identified, based on the maximum required suction pressures and/or the required changes in suction pressure. The suction pressure of the vapour compression system is controlled in accordance with the maximum required suction pressure and/or required change in suction pressure for the identified most loaded cooling entity.

公开(公告)号：US11959676B2

公开(公告)日：2024-04-16

申请号：US17278738

申请日：2019-09-12

Applicant: Danfoss A/S

Inventor： Jan Prins ,  Lars Finn Sloth Larsen

IPC: F25B49/02

CPC classification number: F25B49/02 ,  F25B2400/075 ,  F25B2400/13 ,  F25B2600/025 ,  F25B2600/0272 ,  F25B2600/2523

Abstract: A method for controlling a vapour compression system (1) including a compressor unit (2) including one or more compressors (3, 12), a heat rejecting heat exchanger (4), a receiver (6), an expansion device (7) and an evaporator (8) arranged in a refrigerant path. A pressure value indicating a pressure prevailing inside the receiver (6) is obtained, and the obtained pressure value is compared to a first threshold pressure value. In the case that the obtained pressure value is below the first threshold pressure value, the compressor(s) (3, 12) of the compressor unit (2) are controlled in order to reduce a suction pressure of the vapour compression system (1).

公开(公告)号：US11920842B2

公开(公告)日：2024-03-05

申请号：US17278723

申请日：2019-09-13

Applicant: Danfoss A/S

Inventor： Jan Prins ,  Lars Finn Sloth Larsen

IPC: F25B49/02

CPC classification number: F25B49/02 ,  F25B2309/061 ,  F25B2400/075 ,  F25B2400/13 ,  F25B2600/0251 ,  F25B2600/2509

Abstract: A method for controlling a vapour compression system (1) including a compressor unit (2) including at least two compressors (3, 12), a heat rejecting heat exchanger (4), a receiver (6), an expansion device (7) and an evaporator (8) arranged in a refrigerant path is disclosed. At least one of the compressors is a main compressor (3) being fluidly connected to an outlet of the evaporator (8) and at least one of the compressors is a receiver compressor (12) being fluidly connected to a gaseous outlet (10) of the receiver (6). A flow of vapour entering the receiver (6), such as a mass flow of vapour entering the receiver (6) is estimated and compared to a first threshold value. In the case that the estimated flow is above the first threshold value, a pressure prevailing inside the receiver (6) is controlled by operating the receiver compressor (12).

公开(公告)号：US20220221207A1

公开(公告)日：2022-07-14

申请号：US17609876

申请日：2020-08-13

Applicant: Danfoss A/S

Inventor： Jan Prins ,  Lars Finn Sloth Larsen

IPC: F25B49/02 ,  F25B41/22 ,  F25B5/02 ,  F25B1/10

Abstract: A method for controlling a vapour compression system (1) is disclosed. The vapour compression system (1) includes an ejector (4), and has a non-return valve (11) arranged in the refrigerant path between an outlet (12) of an evaporator (7) and an inlet (10) of a compressor unit (2), in such a manner that a refrigerant flow from the outlet (12) of the evaporator (7) towards the inlet (10) of the compressor unit (2) is allowed, while a fluid flow from the inlet (10) of the compressor unit (2) towards the outlet (12) of the evaporator (7) is prevented. A pressure, P0, of refrigerant leaving the evaporator (7) is measured and a value being representative for a pressure, Psuc, of refrigerant entering the compressor unit (2) is obtained. The pressures, P0 and Psuc, are compared to respective reference pressure values, P0,ref and Psuc,ref. In the case that ε0>εsuc, where ε0=P0−P0,ref and εsuc=Psuc−Psuc,ref, the compressor unit (2) is controlled based on P0, and in the case that εsuc>ε0, the compressor unit (2) is controlled based on Psuc.