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    Method for handling fault mitigation in a vapour compression system
    31.
    发明授权
    Method for handling fault mitigation in a vapour compression system 有权

    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.

    METHOD FOR CONTROLLING EJECTOR CAPACITY IN A VAPOUR COMPRESSION SYSTEM
    32.
    发明申请
    METHOD FOR CONTROLLING EJECTOR CAPACITY IN A VAPOUR COMPRESSION SYSTEM 有权

    公开(公告)号：US20220003473A1

    公开(公告)日：2022-01-06

    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: 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).

    A METHOD FOR CONTROLLING A VAPOUR COMPRESSION SYSTEM DURING GAS BYPASS VALVE MALFUNCTION
    33.
    发明申请
    A METHOD FOR CONTROLLING A VAPOUR COMPRESSION SYSTEM DURING GAS BYPASS VALVE MALFUNCTION 审中-公开

    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).

    Method of coordinating operation of compressors
    35.
    发明授权
    Method of coordinating operation of compressors 有权
    协调压缩机运行的方法

    公开(公告)号：US09551335B2

    公开(公告)日：2017-01-24

    申请号：US14349765

    申请日：2012-10-05

    Applicant: Danfoss A/S

    Inventor： Jan Prins

    IPC: F04B41/06 ,  F25B1/10 ,  F25B7/00 ,  F25B49/02

    CPC classification number: F04B41/06 ,  F25B1/10 ,  F25B7/00 ,  F25B49/022

    Abstract: A method for coordinating operation between at least two groups of compressors in a cooling circuit is disclosed. A first group of compressors forms part of a low temperature (LT) part of the cooling circuit and a second group of compressors forms part of a high temperature (MT) part of the cooling circuit. Each of the compressor groups comprises one or more compressors, and each of the compressor groups comprises a controller, the controllers being capable of exchanging signals. In the case that the LT compressor group needs one or more of the LT compressors to start operation, it is investigated whether or not one or more of the MT compressors is/are operating. If this is the case, one or more of the LT compressors is/are allowed to start operation. If it is not the case, the suction pressure in the MT part of the cooling circuit is established, e.g. measured, and compared to a lower and an upper limit of a neutral pressure zone, said neutral pressure zone lying within an operating pressure zone of the MT part of the cooling circuit. Finally, the MT compressors and the LT compressors are operated based on the comparing step. The cooling system may be a cascade system or a booster system.

    Abstract translation: 公开了一种用于协调冷却回路中的至少两组压缩机之间的操作的方法。 第一组压缩机形成冷却回路的低温（LT）部分的一部分，第二组压缩机形成冷却回路的高温（MT）部分的一部分。 每个压缩机组包括一个或多个压缩机，并且每个压缩机组包括控制器，控制器能够交换信号。 在LT压缩机组需要一台或多台LT压缩机开始运行的情况下，对MT压缩机中的一台或多台是否正在运行进行研究。 如果是这种情况，则允许一个或多个LT压缩机开始运行。 如果不是这样，则建立冷却回路的MT部分中的吸入压力，例如， 测量并与中性压力区域的下限和上限进行比较，所述中性压力区域位于冷却回路的MT部分的工作压力区域内。 最后，基于比较步骤操作MT压缩机和LT压缩机。 冷却系统可以是级联系统或增压系统。

    METHOD OF CONTROLLING ONE OR MORE FANS OF A HEAT REJECTING HEAT EXCHANGER
    36.
    发明申请
    METHOD OF CONTROLLING ONE OR MORE FANS OF A HEAT REJECTING HEAT EXCHANGER 有权
    控制热交换器的一个或多个风机的方法

    公开(公告)号：US20150059369A1

    公开(公告)日：2015-03-05

    申请号：US14390865

    申请日：2013-04-19

    Applicant: Danfoss A/S

    Inventor： Jan Prins ,  Frede Schmidt

    IPC: F25B49/02 ,  F25D17/06

    CPC classification number: F25B49/02 ,  F25B49/027 ,  F25B2313/0294 ,  F25B2600/11 ,  F25B2600/111 ,  F25B2700/172 ,  F25B2700/2103 ,  F25B2700/2106 ,  F25B2700/21163 ,  F25D17/06 ,  Y02B30/743

    Abstract: A method of controlling a fan of a vapour compression system is disclosed. The vapour compression system comprises a compressor, a heat rejecting heat exchanger, e.g. in the form of a gas cooler or a condenser, an expansion device and an evaporator arranged in a refrigerant circuit. The fan is arranged to provide a secondary fluid flow across the heat rejecting heat exchanger, e.g. in the form of an air flow. The method comprises the steps of establishing a temperature, T1, of refrigerant leaving the heat rejecting heat exchanger, establishing a temperature, T2, of ambient air of the heat rejecting heat exchanger, and deriving a temperature difference, ΔT=T1-T2, between the temperature (T1) of refrigerant leaving the heat rejecting heat exchanger and the temperature (T2) of ambient air of the heat rejecting heat exchanger. The temperature difference, ΔT, is compared to a first threshold value and to a second threshold value, the second threshold value being smaller than or equal to the first threshold value, and the rotational speed of the fan is controlled on the basis of the comparing step. The method allows the electrical energy consumption of the fan to be reduced without risking instability of the vapour compression system.

    Abstract translation: 公开了一种控制蒸气压缩系统的风扇的方法。 蒸气压缩系统包括压缩机，排热热交换器，例如， 以气体冷却器或冷凝器的形式，布置在制冷剂回路中的膨胀装置和蒸发器。 风扇被布置成提供穿过排热热交换器的次级流体流，例如， 以空气流的形式。 该方法包括建立离开热排热热交换器的制冷剂的温度T1，建立排热热交换器的环境空气的温度T2，并导出温差，D = T = T1-T2 在离开排热热交换器的制冷剂的温度（T1）和排热热交换器的周围空气的温度（T2）之间。 将温差＆Dgr; T与第一阈值和第二阈值进行比较，第二阈值小于或等于第一阈值，并且风扇的转速基于 比较步骤。 该方法允许降低风扇的电能消耗，而不会造成蒸气压缩系统的不稳定性。

    METHOD OF COORDINATING OPERATION OF COMPRESSORS
    37.
    发明申请
    METHOD OF COORDINATING OPERATION OF COMPRESSORS 有权
    协调压缩机操作的方法

    公开(公告)号：US20140271259A1

    公开(公告)日：2014-09-18

    申请号：US14349765

    申请日：2012-10-05

    Applicant: Danfoss A/S

    Inventor： Jan Prins

    IPC: F04B41/06

    CPC classification number: F04B41/06 ,  F25B1/10 ,  F25B7/00 ,  F25B49/022

    Abstract: A method for coordinating operation between at least two groups of compressors in a cooling circuit is disclosed. A first group of compressors forms part of a low temperature (LT) part of the cooling circuit and a second group of compressors forms part of a high temperature (MT) part of the cooling circuit. Each of the compressor groups comprises one or more compressors, and each of the compressor groups comprises a controller, the controllers being capable of exchanging signals. In the case that the LT compressor group needs one or more of the LT compressors to start operation, it is investigated whether or not one or more of the MT compressors is/are operating. If this is the case, one or more of the LT compressors is/are allowed to start operation. If it is not the case, the suction pressure in the MT part of the cooling circuit is established, e.g. measured, and compared to a lower and an upper limit of a neutral pressure zone, said neutral pressure zone lying within an operating pressure zone of the MT part of the cooling circuit. Finally, the MT compressors and the LT compressors are operated based on the comparing step. The cooling system may be a cascade system or a booster system.

    Abstract translation: 公开了一种用于协调冷却回路中的至少两组压缩机之间的操作的方法。 第一组压缩机形成冷却回路的低温（LT）部分的一部分，第二组压缩机形成冷却回路的高温（MT）部分的一部分。 每个压缩机组包括一个或多个压缩机，并且每个压缩机组包括控制器，控制器能够交换信号。 在LT压缩机组需要一台或多台LT压缩机开始运行的情况下，对MT压缩机中的一台或多台是否正在运行进行研究。 如果是这种情况，则允许一个或多个LT压缩机开始运行。 如果不是这样，则建立冷却回路的MT部分中的吸入压力，例如， 测量并与中性压力区域的下限和上限进行比较，所述中性压力区域位于冷却回路的MT部分的工作压力区域内。 最后，基于比较步骤操作MT压缩机和LT压缩机。 冷却系统可以是级联系统或增压系统。

    Method for controlling suction pressure of a vapour compression system
    38.
    发明授权
    Method for controlling suction pressure of a vapour compression system 有权

    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.

    METHOD FOR CONFIGURING SETPOINTS FOR A VAPOUR COMPRESSION SYSTEM
    40.
    发明申请
    METHOD FOR CONFIGURING SETPOINTS FOR A VAPOUR COMPRESSION SYSTEM 有权

    公开(公告)号：US20220196305A1

    公开(公告)日：2022-06-23

    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.

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