公开(公告)号：US20180231284A1

公开(公告)日：2018-08-16

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 ,  F25B43/00 ,  F22B3/04

Abstract: A vapour compression system (1) comprising at least two evaporator groups (5a, 5b, 5c), each evaporator group (5a, 5b, 5c) comprising 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). The vapour compression system (1) can be controlled in an energy efficient and stable manner. A method for controlling the vapour compression system (1) is also disclosed.

公开(公告)号：US20170328604A1

公开(公告)日：2017-11-16

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

CPC classification number: F25B9/008 ,  F25B41/043 ,  F25B49/02 ,  F25B2309/061 ,  F25B2341/0662 ,  F25B2400/075 ,  F25B2400/13 ,  F25B2400/23 ,  F25B2500/29 ,  F25B2500/31 ,  F25B2600/0253 ,  F25B2600/2509 ,  F25B2700/195 ,  F25B2700/2106 ,  F25B2700/21163 ,  Y02B30/741

Abstract: A method for controlling a vapour compression system (1), the vapour compression system (1) comprising a compressor unit (2) comprising one or more compressors (10, 11, 13), is disclosed. At least one of the compressors (11, 13) of the compressor unit (2) is connectable to a gaseous outlet (9) of a receiver (5), and at least one of the compressors (10, 13) of the compressor unit (2) is connectable to an outlet of an evaporator (7). A parameter of the vapour compression system (1) is measured, an enthalpy of refrigerant leaving the heat rejecting heat exchanger (3) being derivable from the measured parameter. A setpoint value for a pressure inside the receiver (5) is calculated, based on the measured parameter, and the compressor unit (2) is operated in accordance with the calculated setpoint value, and in order to obtain a pressure inside the receiver (5) which is equal to the calculated setpoint value. The vapour compression system (1) is operated in an energy efficient manner over a wide range of ambient temperatures.

公开(公告)号：US20170261245A1

公开(公告)日：2017-09-14

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

CPC classification number: F25B41/00 ,  F25B41/04 ,  F25B2341/0012 ,  F25B2341/0013 ,  F25B2341/0015 ,  F25B2600/17 ,  F25B2600/2503 ,  F25B2700/195 ,  F25B2700/21163

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：US20160177938A1

公开(公告)日：2016-06-23

申请号：US14910291

申请日：2014-02-07

Applicant: DANFOSS A/S

Inventor： Jan Prins

IPC: F04B49/03 ,  F04B27/00

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

Abstract translation: 公开了一种用于蒸汽压缩系统的往复式压缩机的操作方法。 往复式压缩机包括至少两个气缸和至少两个卸载器，每个卸载器可以在空转模式或主动模式下操作，因此往复式压缩机可以以两个以上的容量状态运行。 容量状态在状态之间周期性地交替，使得可以在各个气缸均匀加载的同时获得基本连续的有效容量范围

公开(公告)号：US20220034567A1

公开(公告)日：2022-02-03

申请号：US17278738

申请日：2019-09-12

Applicant: Danfoss A/S

Inventor： Jan Prins ,  Lars Finn Sloth Larsen

IPC: F25B49/02

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：US20220034566A1

公开(公告)日：2022-02-03

申请号：US17278723

申请日：2019-09-13

Applicant: Danfoss A/S

Inventor： Jan Prins ,  Lars Finn Sloth Larsen

IPC: F25B49/02

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：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.