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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).
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公开(公告)号：US10788030B2
公开(公告)日：2020-09-29
申请号：US14910291
申请日：2014-02-07
Applicant: DANFOSS A/S
Inventor： Jan Prins
Abstract: A method of operating a reciprocating compressor for a vapour compression system is disclosed. The reciprocating compressor comprises at least two cylinders and at least two unloaders, each unloader can be operated in an idle mode or in an active mode and therefore the reciprocating compressor can run in more than two capacity states. The capacity states alternates periodically between states in such a way that a substantially continuous range of effective capacities can be obtained while the individual cylinders are evenly loaded.
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3.发明申请公开(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
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.
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公开(公告)号：US10107531B2
公开(公告)日：2018-10-23
申请号：US14419822
申请日：2013-07-12
Applicant: Danfoss A/S
Inventor： Jan Prins
Abstract: A method for controlling a chiller system, the chiller system comprising a primary side in the form of a vapor compression system, and a secondary side, is disclosed. The secondary side comprises a variable speed pump for providing a secondary fluid flow through the evaporator of the primary side in such a manner that heat exchange takes place between refrigerant of the primary side and fluid of the secondary side in the evaporator, the secondary side further comprising a temperature sensor arranged in the secondary fluid flow. The method comprises the steps of monitoring a temperature of the secondary fluid flow by means of the temperature sensor, and controlling the compressor capacity and the speed of the variable speed pump on the basis of the monitored temperature, and in order to obtain a predetermined setpoint temperature, in such a manner that the closed loop gain of the chiller system, K=Kp·Ke, where Kp is the gain of the compressor capacity controller and Ke is the gain of the evaporator, is kept substantially constant.
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5.发明授权公开(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.
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Patent Agency Ranking
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
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.
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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.
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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
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.
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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
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).
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10.发明申请公开(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.
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