公开(公告)号：US10563892B2

公开(公告)日：2020-02-18

申请号：US15501534

申请日：2015-08-21

Applicant: DANFOSS A/S

Inventor： Frede Schmidt ,  Kristian Fredslund ,  Jan Prins

IPC: F25B45/00 ,  F25B49/00 ,  F25B49/02 ,  G01K13/00

Abstract: A level sensor is configured to provide a receiver level indicating an amount of the refrigerant present in the receiver and a level model provides a heat rejecting heat exchanger estimate indicating an amount of the refrigerant present in the heat rejecting heat exchanger based on a temperature of the refrigerant. From the sensor and the model, a loss of refrigerant from the refrigerant vapor compression system is estimated.

公开(公告)号：US20190301780A1

公开(公告)日：2019-10-03

申请号：US16461937

申请日：2017-11-15

Applicant: Danfoss A/S

Inventor： Frede Schmidt ,  Jan Prins ,  Kristian Fredslund ,  Kenneth Bank Madsen

IPC: F25B41/06 ,  F25B49/02

Abstract: A method for controlling a vapour compression system (1) is disclosed. A mass flow of refrigerant along a part of the refrigerant path is estimated, based on measurements performed by one or more pressure sensors (10, 12, 13) for measuring a refrigerant pressure at selected positions along the refrigerant path and one or more temperature sensors (11, 14) for measuring a refrigerant temperature at selected positions along the refrigerant path. A refrigerant pressure or a refrigerant temperature at a selected position a pressure sensor (10, 12, 13) or temperature sensor (11, 14) along the refrigerant path is derived, based on the estimated mass flow. The vapour compression system (1) is allowed to continue operating, even if a sensor (10, 11, 12, 13, 14) is malfunctioning or unreliable.

公开(公告)号：US20190301773A1

公开(公告)日：2019-10-03

申请号：US16461933

申请日：2017-11-15

Applicant: Danfoss A/S

Inventor： Kristian Fredslund ,  Kenneth Bank Madsen ,  Jan Prins ,  Frede Schmidt

IPC: F25B1/10 ,  F25B49/02

Abstract: A method for controlling a vapour compression system (1) is disclosed, the vapour compression system (1) comprising at least one compressor (2, 16), a heat rejecting heat exchanger (3), a high pressure expansion device (4, 15, 17), a receiver (5), an evaporator expansion device (6), an evaporator (7) and a gas bypass valve (8), arranged in a refrigerant path. It is registered that the gas bypass valve (8) is malfunctioning or saturated, and a pressure value for a pressure prevailing inside the receiver (5) is obtained. Finally, the vapour compression system (1) is controlled in order to control a gaseous refrigerant supply to the receiver (5) to adjust the pressure prevailing inside the receiver (5) to reach a target pressure level.

公开(公告)号：US20180164004A1

公开(公告)日：2018-06-14

申请号：US15577916

申请日：2016-05-25

Applicant: DANFOSS A/S

Inventor： Frede Schmidt ,  Kristian Fredslund ,  Jan Prins

IPC: F25B29/00 ,  F25B1/10 ,  F25B40/04 ,  F25B49/02

CPC classification number: F25B29/003 ,  F25B1/10 ,  F25B40/04 ,  F25B49/022 ,  F25B2400/075 ,  F25B2400/13 ,  F25B2400/23 ,  Y02B30/52

Abstract: A method for operating a vapour compression system (1) comprising a heat recovery heat exchanger (4) is disclosed. The heat recovery system requests a required level of recovered heat to be provided by the heat recovery heat exchanger (4) to the heat recovery system, generates a signal indicating the required level of recovered heat, and supplies the generated signal to a control unit of the vapour compression system (1). A setpoint value for at least one control parameter of the vapour compression system (1) is calculated, based on the generated signal, and the vapour compression system (1) is operated in accordance with the calculated setpoint value(s).

公开(公告)号：US20170219263A1

公开(公告)日：2017-08-03

申请号：US15501534

申请日：2015-08-21

Applicant: DANFOSS A/S

Inventor： Frede Schmidt ,  Kristian Fredslund ,  Jan Prins

IPC: F25B45/00 ,  F25B49/00

Abstract: A level sensor is configured to provide a receiver level indicating an amount of the refrigerant present in the receiver and a level model provides a heat rejecting heat exchanger estimate indicating an amount of the refrigerant present in the heat rejecting heat exchanger based on a temperature of the refrigerant. From the sensor and the model, a loss of refrigerant from the RVCS system is estimated.

公开(公告)号：US12196468B2

公开(公告)日：2025-01-14

申请号：US17514002

申请日：2021-10-29

Applicant: Danfoss A/S

Inventor： Jan Prins ,  Peter Reichwald ,  Salvatore Piscopiello

IPC: F25B49/02 ,  G05B13/02

Abstract: A method for configuring a plurality of operating setpoints for a vapour compression system (1) is disclosed. The plurality of operating setpoints are divided into a first group (12) of operating setpoints to be generated manually and a second group (13) of operating setpoints to be generated automatically, and the operating setpoints are operated in accordance therewith. The manually generated operating setpoints (12) and the automatically generated operating setpoints (13) are provided to a setpoint manager (11), and the setpoint manager (11) checks if the provided operating setpoints (12, 13) are in compliance with a set of rules. In the case that at least some of the provided operating setpoints (12, 13) are not in compliance with the set of rules, the setpoint manager (11) adjusts at least some of the provided operating setpoints (12, 13) in accordance with the set of rules, thereby obtaining an adjusted set of operating setpoints. The vapour compression system (1) is subsequently controlled in accordance with the adjusted set of operating setpoints.

公开(公告)号：US12097451B2

公开(公告)日：2024-09-24

申请号：US16461938

申请日：2017-11-15

Applicant: Danfoss A/S

Inventor： Jan Prins ,  Frede Schmidt ,  Kenneth Bank Madsen ,  Kristian Fredslund

IPC: B01D35/147 ,  F25B1/10 ,  F25B49/02 ,  F25B41/00 ,  F25B41/39

CPC classification number: B01D35/1475 ,  F25B1/10 ,  F25B49/02 ,  F25B49/022 ,  F25B41/00 ,  F25B41/39 ,  F25B2309/14 ,  F25B2341/0012 ,  F25B2400/075 ,  F25B2400/23 ,  F25B2500/19 ,  F25B2600/0253 ,  F25B2600/111 ,  F25B2600/2509 ,  F25B2600/2513 ,  F25B2700/193 ,  F25B2700/1931 ,  F25B2700/195 ,  F25B2700/21152 ,  F25B2700/21163 ,  Y02B30/70

Abstract: A method for controlling a vapour compression system (1) is disclosed. Malfunctioning of a gas bypass valve (8) is registered. An actual opening degree of the gas bypass valve (8) is derived, and a target opening degree of the gas bypass valve (8) is derived, based on one or more control parameters of the vapour compression system (1). The actual opening degree is compared to the target opening degree, and the vapour compression system (1) is controlled based on the comparison, and in order to match a mass flow of gaseous refrigerant through the gas bypass valve (8) to the actual opening degree of the gas bypass valve (8).

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.