公开(公告)号：EP3371523A1

公开(公告)日：2018-09-12

申请号：EP16788142.4

申请日：2016-10-31

Applicant: Danfoss A/S

Inventor： FREDSLUND, Kristian ,  PRINS, Jan ,  MADSEN, Kenneth, Bank ,  SCHMIDT, Frede

IPC: F25B1/10 ,  F25B9/08 ,  F25B41/04

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：EP3365620A1

公开(公告)日：2018-08-29

申请号：EP16781480.5

申请日：2016-10-14

Applicant: Danfoss A/S

Inventor： PRINS, Jan ,  SCHMIDT, Frede ,  MADSEN, Kenneth, Bank ,  FREDSLUND, Kristian

IPC: F25B49/02

CPC classification number: F25B49/022 ,  F25B5/02 ,  F25B6/02 ,  F25B9/08 ,  F25B2341/0012 ,  F25B2400/075 ,  F25B2400/16 ,  F25B2400/23 ,  F25B2500/28

Abstract: A method for controlling a vapour compression system (1) is disclosed. The vapour compression system (1) comprises 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) being allowed to be operated in a flooded state 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：EP2839226A1

公开(公告)日：2015-02-25

申请号：EP13725269.8

申请日：2013-04-19

Applicant: Danfoss A/S

Inventor： PRINS, Jan ,  SCHMIDT, Frede

IPC: F25B49/02

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, T
1 , of refrigerant leaving the heat rejecting heat exchanger, establishing a temperature, T
2 , of ambient air of the heat rejecting heat exchanger, and deriving a temperature difference, ΔΤ=Τ
1 -Τ
2 , between the temperature (T
1 ) of refrigerant leaving the heat rejecting heat exchanger and the temperature (T
2 ) of ambient air of the heat rejecting heat exchanger. The temperature difference, ΔΤ, 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: 一种控制蒸气压缩系统的风扇的方法是游离缺失盘。 蒸汽压缩系统包括压缩机，排热换热器，E.G. 在气体冷却器或冷凝器，膨胀装置以及在制冷剂回路布置蒸发器的形式。 风扇被布置成提供穿过热量的次级流体流排热换热器，E.G. 在空气流的形式。 该方法包括建立一个温度的步骤，T 1，的制冷剂在离开排热换热器，建立温度，T 2，热的环境空气的排热换热器，并且导出的温度差，“T = T 1 T 2，温度的制冷剂（T 1）在离开排热换热器的环境空气的排热换热器和所述温度（T 2）之间。 的温度差，“T，被相对于第一阈值和第二阈值，第二阈值是小于或等于第一阈值，和所述风扇的旋转速度的基础上控制 比较步骤。 该方法允许在不危及蒸汽压缩系统的不稳定性以能够降低风扇的电能消耗。

公开(公告)号：EP2817685A2

公开(公告)日：2014-12-31

申请号：EP13707100.7

申请日：2013-02-16

Applicant: Danfoss A/S

Inventor： MADSEN, Kenneth Bang ,  NIELSEN, Leif Skovvang ,  SCHMIDT, Flemming Morten ,  SCHMIDT, Frede

IPC: G05B19/05

CPC classification number: F25B49/02 ,  G05B15/02 ,  G05B19/056

Abstract: The invention relates to a method for configuring, on a control unit, operating parameters of a plurality of devices of a refrigeration system. A user selects on the control unit, among the plurality of devices of the refrigeration system, a first device to configure. Information of valid configurable operating parameters of the first device is provided on the control unit. The user selects at least one of the valid configurable operating parameters of the first device, thereby configuring the first device. Information stored about operating parameters of other devices of the refrigeration system, based on the configuration of the first device, is then provided on the control unit. Finally, the user confirms, on the control unit, one or more operating parameters of one or more of the other devices, thereby configuring the one or more other devices. The invention also relates to a control unit and a refrigeration system.

公开(公告)号：EP2764303A1

公开(公告)日：2014-08-13

申请号：EP12772209.8

申请日：2012-10-05

Applicant: Danfoss A/S

Inventor： MADSEN, Kenneth, Bank ,  SCHMIDT, Frede

IPC: F25B49/00

CPC classification number: F25B49/027 ,  F25B39/04 ,  F25B49/005 ,  F25B2309/061 ,  F25B2313/0313 ,  F25B2600/17 ,  F25B2700/195 ,  F25B2700/2102

Abstract: A method for monitoring gas pressure in a heat rejecting heat exchanger in a cooling circuit is disclosed. The present capacity of one or more compressors in the cooling circuit compared to a maximum capacity of the one or more compressors is established. If the present capacity of the one or more compressors is at least at a level corresponding to a pre-set percentage of the maximum capacity, a period of time elapsed from a point in time where the compressor capacity reached said level is established. If the established period of time has a duration which is longer than a pre-set period of time, then it is concluding that the cooling medium is in a gas loop operational mode, allowing an operator or a controller to adjust operation of the cooling plant such that the cooling medium is brought out of the gas loop operational mode.

公开(公告)号：EP0784776B1

公开(公告)日：1999-02-17

申请号：EP95933339.4

申请日：1995-10-11

Applicant: Danfoss A/S

Inventor： SCHMIDT, Frede

IPC: F25B41/06 ,  F25B49/02

CPC classification number: F25B41/062 ,  F25B2341/065 ,  F25B2600/21 ,  F25B2600/2513 ,  F25B2700/21174 ,  F25B2700/21175 ,  G05B11/42 ,  G05D23/1931 ,  Y02B30/72

公开(公告)号：EP0811136A1

公开(公告)日：1997-12-10

申请号：EP96903930.0

申请日：1996-02-19

Applicant: Danfoss A/S

Inventor： SCHMIDT, Frede

IPC: F25B41 ,  G05D23

CPC classification number: F25B41/062 ,  F25B2600/21 ,  F25B2600/2513 ,  F25B2700/21174 ,  F25B2700/21175 ,  G05D23/1919

Abstract: In a method for controlling the superheat temperature (Tü) of the refrigerant in an evaporator arrangement (1) of a refrigeration system or heat pump system (1-4), the evaporator arrangement (1), a compressor arrangement (2), a condenser (3) and a controllable expansion valve arrangement (4) are arranged in succession in a closed circuit. The superheat temperature (Tü) is controlled in dependence on a comparison between desired and actual values. The desired value (W2) of the superheat temperature (Tü is varied automatically in dependence on the difference (d) from a reference value (W1) of a periodically determined function (S) of a number of sampled values of a temperature (T1; T2) of the refrigerant with the aim of a stable control of the superheat temperature (Tü). To achieve optimum filling and to optimize the superheating in such systems, provision is made for the said function (S) to characterize the variability of a number of sampled values of the temperature (T2) of the refrigerant at the output of the evaporator arrangement (4) about a mean value of the sampled values.

公开(公告)号：EP0788592A1

公开(公告)日：1997-08-13

申请号：EP95935868.0

申请日：1995-11-02

Applicant: Danfoss A/S

Inventor： BENDTSEN, Christian ,  SCHMIDT, Frede

IPC: F25D21 ,  F25B5 ,  F25D17

CPC classification number: F25D21/008 ,  F25B5/02 ,  F25B2400/22 ,  F25D17/02

Abstract: A method for defrosting a refrigeration system (38) makes provison for partial defrosting of the cooling surface (39) to be carried out at relatively short intervals, and for full defrosting to be carried out at longer intervals. To that end an associated control unit (41) has four timers (44 to 47) which determine the switching on and switching off times of the defrosting processes. In this manner the interval between successive full defrostings can be considerably increased.