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：US10962262B2

公开(公告)日：2021-03-30

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：US10928107B2

公开(公告)日：2021-02-23

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

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：US10544971B2

公开(公告)日：2020-01-28

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 vapor compression system (1) is disclosed, the vapor 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 maximized and the portion of refrigerant supplied directly to the compressor unit (2) is minimized, while ensuring that the pressure of refrigerant leaving the evaporator (8) does not decrease below an acceptable level.

公开(公告)号：US20190264962A1

公开(公告)日：2019-08-29

申请号：US16308509

申请日：2017-06-21

Applicant: Danfoss A/S

Inventor： Flemming Morten Schmidt ,  Jan Prins ,  Frede Schmidt ,  Kristian Fredslund

IPC: F25B43/02 ,  F25B31/00

Abstract: A method for controlling a valve arrangement (10) interconnecting at least one oil separator (8) and an oil receiver (9) in a vapour compression system (1) is disclosed. A pressure difference between a pressure prevailing inside the oil separator(s) (8) and a pressure prevailing inside the oil receiver (9) is obtained. Then a duration for an open time of an open/close sequence of the valve arrangement (10) is derived, based on the obtained pressure difference, and the valve arrangement (10) is controlled in accordance with the derived duration of an open time. The supply of oil to the oil receiver (9) can be accurately controlled, regardless of the operating conditions.

公开(公告)号：US10378796B2

公开(公告)日：2019-08-13

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 ,  F25B41/00 ,  F25B41/04 ,  F25B49/02

Abstract: A method for controlling a valve arrangement (12), e.g. in the form of a three way valve, in a vapor compression system (1) is disclosed, the vapor 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 vapor 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 vapor 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：US20180313581A1

公开(公告)日：2018-11-01

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 ,  F25B9/08 ,  F25B41/04

CPC classification number: F25B1/10 ,  F25B9/08 ,  F25B41/04 ,  F25B2341/0012 ,  F25B2341/0662 ,  F25B2400/23 ,  F25B2600/2519

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：US20180283754A1

公开(公告)日：2018-10-04

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 (1) comprising an ejector (6) is disclosed. In the case that a pressure difference between a pressure prevailing in the receiver (7) and a pressure of refrigerant leaving the evaporator (9) decreases below a first lower threshold value, the pressure of refrigerant leaving the heat rejecting heat exchanger (5) is kept at a level which is slightly higher than the pressure level providing optimal COP. Thereby the ejector (6) can operate at lower ambient temperatures, and the energy efficiency of the vapour compression system (1) is improved.