公开(公告)号：US20190323752A1

公开(公告)日：2019-10-24

申请号：US16071139

申请日：2017-02-03

Applicant: Danfoss A/S, Danfoss Intellectual Property

Inventor： Kristian Fredslund ,  Frede Schmidt ,  Jan Prins

IPC: F25B49/02 ,  F24F11/77

Abstract: A method for controlling a fan (6) of a vapour compression system (1) is disclosed, the fan (6) being arranged to provide a secondary fluid flow across a heat rejecting heat exchanger (3). A temperature difference, ΔT=Tout−Tamb, between a temperature, Tout, of refrigerant leaving the heat rejecting heat exchanger (3) and a temperature, Tamb, of ambient air of the heat rejecting heat exchanger (3) is established. A setpoint value, ΔTsetp, for the temperature difference, ΔT, is obtained, the setpoint value, ΔTsetp, being dependent on the fan speed of the fan (6) in such a manner that the setpoint value, ΔTsetp, increases as the fan speed increases. The fan speed of the fan (6) is controlled in order to control the temperature difference, ΔT, in accordance with the obtained setpoint value, ΔTsetp.

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：US11340000B2

公开(公告)日：2022-05-24

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: F25B41/00 ,  F25B49/02 ,  F25B41/34

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：US20190299132A1

公开(公告)日：2019-10-03

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

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：US20170343245A1

公开(公告)日：2017-11-30

申请号：US15531989

申请日：2015-10-08

Applicant: DANFOSS A/S

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

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

CPC classification number: F25B9/008 ,  F25B41/00 ,  F25B41/043 ,  F25B49/02 ,  F25B2309/061 ,  F25B2341/0012 ,  F25B2341/0662 ,  F25B2400/0407 ,  F25B2400/13 ,  F25B2400/23 ,  F25B2500/31 ,  F25B2600/2507 ,  F25B2700/195 ,  F25B2700/2109 ,  F25B2700/21151 ,  F25B2700/21175

Abstract: A method for controlling a valve arrangement (12), e.g. in the form of a three way valve, in a vapour compression system (1) is disclosed, the vapour compression system (1) comprising an ejector (6). The valve arrangement (12) is arranged to supply refrigerant to a compressor unit (2) from the gaseous outlet (11) of a receiver (7) and/or from the outlet of an evaporator (9). The vapour compression system (1) may be operated in a first mode of operation (summer mode) or in a second mode of operation (winter mode). When operated in the second mode of operation, it is determined whether or not conditions for operating the vapour compression system (1) in the first mode of operation are prevailing. If this is the case, the valve arrangement (12) is actively switched to the first mode of operation by closing a first inlet (13) towards the evaporator (7) and fully opening a second inlet (14) towards the receiver (7).

公开(公告)号：US11460230B2

公开(公告)日：2022-10-04

申请号：US15763904

申请日：2016-10-14

Applicant: Danfoss A/S

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

IPC: F25B49/02 ,  F25B9/08 ,  F25B41/00 ,  F25B41/385

Abstract: A method for controlling a vapour compression system (1) is disclosed, the vapour compression system (1) comprising at least one expansion device (8) and at least one evaporator (9). For each expansion device (8), an opening degree of the expansion device (8) is obtained, and a representative opening degree, ODrep, is identified based on the obtained opening degree(s) of the expansion device(s) (8). The representative opening degree could be a maximum opening degree, ODmax, being the largest among the obtained opening degrees. The representative opening degree, ODrep, is compared to a predefined target opening degree, ODtarget, and a minimum setpoint value, SPrec, for a pressure prevailing inside a receiver (7), is calculated or adjusted, based on the comparison. The vapour compression system (1) is controlled to obtain a pressure inside the receiver (7) which is equal to or higher than the calculated or adjusted minimum setpoint value, SPrec.

公开(公告)号：US10775086B2

公开(公告)日：2020-09-15

申请号：US15763918

申请日：2016-10-14

Applicant: Danfoss A/S

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

IPC: F25B49/02 ,  F25B41/00 ,  F25B1/08 ,  F25B9/08

Abstract: A method for controlling a vapour compression system having an ejector includes, in the case that a pressure difference between a pressure prevailing in the receiver and a pressure of refrigerant leaving the evaporator decreases below a first lower threshold value, the pressure of refrigerant leaving the heat rejecting heat exchanger is kept at a level which is slightly higher than the pressure level providing optimal coefficient of performance.

公开(公告)号：US10724778B2

公开(公告)日：2020-07-28

申请号：US16071139

申请日：2017-02-03

Applicant: Danfoss A/S, Danfoss Intellectual Property

Inventor： Kristian Fredslund ,  Frede Schmidt ,  Jan Prins

IPC: F25B49/02 ,  F24F11/77 ,  F24F140/20

Abstract: A method for controlling a fan (6) of a vapour compression system (1) is disclosed, the fan (6) being arranged to provide a secondary fluid flow across a heat rejecting heat exchanger (3). A temperature difference, ΔT=Tout−Tamb, between a temperature, Tout, of refrigerant leaving the heat rejecting heat exchanger (3) and a temperature, Tamb, of ambient air of the heat rejecting heat exchanger (3) is established. A setpoint value, ΔTsetp, for the temperature difference, ΔT, is obtained, the setpoint value, ΔTsetp, being dependent on the fan speed of the fan (6) in such a manner that the setpoint value, ΔTsetp, increases as the fan speed increases. The fan speed of the fan (6) is controlled in order to control the temperature difference, ΔT, in accordance with the obtained setpoint value, ΔTsetp.

公开(公告)号：US10508850B2

公开(公告)日：2019-12-17

申请号：US15763988

申请日：2016-10-14

Applicant: Danfoss A/S

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

IPC: F25B49/02 ,  F25B5/02 ,  F25B6/02 ,  F25B9/08

Abstract: A vapour compression system (1) includes an ejector (6) and a liquid separating device (10) arranged in a suction line. At least one evaporator (9) is allowed to be operated in a flooded state. A flow rate of refrigerant from the liquid separating device (10) to the secondary inlet (15) of the ejector (6) is detected, and it is determined whether or not the flow rate is sufficient to remove liquid refrigerant produced by the evaporator(s) (9) from the liquid separating device (10). In the case that it is determined that the flow rate of refrigerant from the liquid separating device (10) to the secondary inlet (15) of the ejector (6) is insufficient to remove liquid refrigerant produced by the evaporator(s) (9), the flow rate of refrigerant from the liquid separating device (10) to the secondary inlet (15) of the ejector (6) is increased, and/or a flow rate of liquid refrigerant from the evaporator(s) (9) to the liquid separating device (10) is decreased.

公开(公告)号：US20180283750A1

公开(公告)日：2018-10-04

申请号：US15763904

申请日：2016-10-14

Applicant: Danfoss A/S

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

IPC: F25B49/02

Abstract: A method for controlling a vapour compression system (1) is disclosed, the vapour compression system (1) comprising at least one expansion device (8) and at least one evaporator (9). For each expansion device (8), an opening degree of the expansion device (8) is obtained, and a representative opening degree, ODrep, is identified based on the obtained opening degree(s) of the expansion device(s) (8). The representative opening degree could be a maximum opening degree, ODmax, being the largest among the obtained opening degrees. The representative opening degree, ODrep, is compared to a predefined target opening degree, ODtarget, and a minimum setpoint value, SPrec, for a pressure prevailing inside a receiver (7), is calculated or adjusted, based on the comparison. The vapour compression system (1) is controlled to obtain a pressure inside the receiver (7) which is equal to or higher than the calculated or adjusted minimum setpoint value, SPrec.