公开(公告)号：US20170321941A1

公开(公告)日：2017-11-09

申请号：US15527545

申请日：2015-10-07

Applicant: DANFOSS A/S

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

IPC: F25B49/02 ,  F25B41/00 ,  F25B9/00

Abstract: A method for controlling a vapour compression system (1) is disclosed, the vapour compression system (1) comprising an ejector (5). The method comprises controlling a compressor unit (2) in order to adjust a pressure inside a receiver (6), on the basis of a detected pressure of refrigerant leaving an evaporator (8). The portion of refrigerant leaving the evaporator (8) which is supplied to a secondary inlet (15) of the ejector is maximised and the portion of refrigerant supplied directly to the compressor unit (2) is minimised, while ensuring that the pressure of refrigerant leaving the evaporator (8) does not decrease below an acceptable level.

公开(公告)号：US11060767B2

公开(公告)日：2021-07-13

申请号：US15771199

申请日：2016-10-31

Applicant: Danfoss A/S

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

IPC: F25B1/10 ,  F25B41/385 ,  F25B41/39 ,  F25B41/20 ,  F25B9/08

Abstract: A method for operating a compressor unit (2) comprising one or more compressors (8, 9, 10) is disclosed, the compressor unit (2) being arranged in a vapour compression system (1). Two or more options for distributing the available compressor capacity of the compressor unit (2) between being connected to a high pressure suction line (11) and to a medium pressure suction line (13) are defined. For each option, an expected impact on one or more operating parameters of the vapour compression system (1), resulting from distributing the available compressor capacity according to the option, is predicted. An option is selected, based on the predicted expected impact for the options, and based on current operating demands of the vapour compression system (1), and the available compressor capacity is distributed according to the selected option, e.g. by means of settings of one or more valve arrangements (14, 15).

公开(公告)号：US10941964B2

公开(公告)日：2021-03-09

申请号：US15527496

申请日：2015-10-07

Applicant: DANFOSS A/S

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

IPC: F25B9/00 ,  F25B41/04 ,  F25B49/02

Abstract: A method for controlling a vapour compression system, the vapour compression system including a compressor unit with one or more compressors. At least one of the compressors is connectable to a gaseous outlet of a receiver, and at least one of the compressors is connectable to an outlet of an evaporator. A parameter of the vapour compression system is measured, an enthalpy of refrigerant leaving the heat rejecting heat exchanger being derivable from the measured parameter. A setpoint value for a pressure inside the receiver is calculated, based on the measured parameter, and the compressor unit is operated in accordance with the calculated setpoint value, and in order to obtain a pressure inside the receiver which is equal to the calculated setpoint value. The vapour compression system is operated in an energy efficient manner over a wide range of ambient temperatures.

公开(公告)号：US10816245B2

公开(公告)日：2020-10-27

申请号：US15752042

申请日：2016-07-01

Applicant: Danfoss A/S

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

IPC: F25B41/06 ,  F25B49/02 ,  F25B41/00 ,  F22B3/04 ,  F25B43/00

Abstract: A method for controlling a vapour compression system in an energy efficient and stable manner, the vapour compression system (1) including at least two evaporator groups (5a, 5b, 5c), each evaporator group (5a, 5b, 5c) including an ejector unit (7a, 7b, 7c), at least one evaporator (9a, 9b, 9c) and a flow control device (8a, 8b, 8c) controlling a flow of refrigerant to the at least one evaporator (9a, 9b, 9c). For each evaporator group (5a, 5b, 5c) the outlet of the evaporator (9a, 9b, 9c) is connected to a secondary inlet (12a, 12b, 12c) of the corresponding ejector unit (7a, 7b, 7c).

公开(公告)号：US10598414B2

公开(公告)日：2020-03-24

申请号：US15503761

申请日：2015-06-23

Applicant: DANFOSS A/S

Inventor： Kenneth Bank Madsen ,  Jan Prins ,  Kristian Fredslund

IPC: F25B41/00 ,  F25B41/04

Abstract: A method for controlling a variable capacity ejector unit (7) arranged in a refrigeration system (1) is disclosed. An ejector control signal for the ejector unit (7) is generated, based on an obtained temperature and an obtained pressure of refrigerant leaving a heat rejecting heat exchanger (3), or on the basis of a high pressure valve control signal for controlling an opening degree of a high pressure valve (6) arranged fluidly in parallel with the ejector unit (7). The ejector control signal indicates whether the capacity of the ejector unit (7) should be increased, decreased or maintained. The capacity of the ejector unit (7) is controlled in accordance with the generated ejector control signal. The power consumption of the refrigeration system (1) is reduced, while the pressure of the refrigerant leaving the heat rejecting heat exchanger (3) is maintained at an acceptable level.

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.