公开(公告)号：US11549734B2

公开(公告)日：2023-01-10

申请号：US17044151

申请日：2019-06-21

Applicant: Danfoss A/S

Inventor： Roozbeh Izadi-Zamanabadi ,  Carsten Mølhede Thomsen

IPC: F25B13/00 ,  F25B47/02 ,  F25B39/00 ,  F25B49/02

Abstract: A method for terminating defrosting of an evaporator (104) is disclosed. The evaporator (104) is part of a vapour compression system (100). The vapour compression system (100) further comprises a compressor unit (101), a heat rejecting heat exchanger (102), and an expansion device (103). The compressor unit (101), the heat rejecting heat exchanger (102), the expansion device (103) and the evaporator (104) are arranged in a refrigerant path, and an air flow is flowing across the evaporator (104). When ice is accumulated on the evaporator (104), the vapour compression system (100) operates in a defrosting mode. At least one temperature sensor (305) monitors a temperature Tair, of air leaving the evaporator (104). A rate of change of Tair is monitored and defrosting is terminated when the rate of change of the temperature, Tair, approaches zero.

公开(公告)号：US20150219506A1

公开(公告)日：2015-08-06

申请号：US14422412

申请日：2013-07-10

Applicant: Danfoss A/S

Inventor： Roozbeh Izadi-Zamanabadi ,  Casper Lindholdt Andersen

IPC: G01K15/00

CPC classification number: G01K15/005 ,  F25B49/02 ,  F25B2600/2513 ,  F25B2700/21174 ,  F25B2700/21175

Abstract: A method for calibrating a temperature sensor arranged in a vapour compression system is disclosed. The opening degree of an expansion device is alternatingly increased and decreased. Simultaneously a temperature of refrigerant entering the evaporator and a temperature of refrigerant leaving the evaporator are monitored. For each cycle of the opening degree of the expansion device, a maximum temperature, T1, max, of refrigerant entering the evaporator, and a minimum temperature, T2, min, of refrigerant leaving the evaporator are registered. A calibration value, ΔT1, is calculated as ΔT1=C−(T2, min−T1, max) for each cycle, and a maximum calibration value, among the calculated values is selected. Finally, temperature measurements performed by the first temperature sensor are adjusted by an amount defined by ΔT1, max.

Abstract translation: 公开了一种用于校准布置在蒸气压缩系统中的温度传感器的方法。 膨胀装置的开度交替地增加和减少。 同时监测进入蒸发器的制冷剂的温度和离开蒸发器的制冷剂的温度。 对于膨胀装置的开度的每个循环，记录进入蒸发器的制冷剂的最高温度T1，max和离开蒸发器的制冷剂的最低温度T2，min。 每个循环的校正值＆Dgr; T1计算为＆Dgr; T1 = C-（T2，min-T1，max），并选择计算值之间的最大校准值。 最后，由第一温度传感器进行的温度测量由＆Dgr; T1，max定义的量调节。

公开(公告)号：US10663200B2

公开(公告)日：2020-05-26

申请号：US16068925

申请日：2017-01-10

Applicant: Danfoss A/S

Inventor： Roozbeh Izadi-Zamanabadi

IPC: F25B49/02 ,  F25B41/06 ,  F25B49/00 ,  F24F11/32

Abstract: A method for controlling a supply of refrigerant to an evaporator of a vapour compression system, such as a refrigeration system, an air condition system or a heat pump. During normal operation, the opening degree of the expansion valve is controlled on the basis of an air temperature, Tair, of air flowing across the evaporator and/or on the basis of superheat of refrigerant leaving the evaporator. If at least one sensor used for obtaining Tair or the superheat is malfunctioning, operation of the vapour compression system is switched to a contingency mode. A reference temperature, Tout, ref, is calculated, based on previously obtained values of a temperature, Tout, of refrigerant leaving the evaporator, during a predefined previous time interval, and subsequently the opening degree of the expansion valve is controlled on the basis of the obtained temperature, Tout, in order to reach the calculated reference temperature, Tout, ref.

公开(公告)号：US09726556B2

公开(公告)日：2017-08-08

申请号：US14422412

申请日：2013-07-10

Applicant: Danfoss A/S

Inventor： Roozbeh Izadi-Zamanabadi ,  Casper Lindholdt Andersen

IPC: G01K15/00 ,  F25B49/02

CPC classification number: G01K15/005 ,  F25B49/02 ,  F25B2600/2513 ,  F25B2700/21174 ,  F25B2700/21175

Abstract: A method for calibrating a temperature sensor arranged in a vapor compression system is disclosed. The opening degree of an expansion device is alternatingly increased and decreased. Simultaneously a temperature of refrigerant entering the evaporator and a temperature of refrigerant leaving the evaporator are monitored. For each cycle of the opening degree of the expansion device, a maximum temperature, T1, max, of refrigerant entering the evaporator, and a minimum temperature, T2, min, of refrigerant leaving the evaporator are registered. A calibration value, ΔT1, is calculated as ΔT1=C−(T2, min−T1, max) for each cycle, and a maximum calibration value, among the calculated values is selected. Finally, temperature measurements performed by the first temperature sensor are adjusted by an amount defined by ΔT1, max.

公开(公告)号：US20160327322A1

公开(公告)日：2016-11-10

申请号：US15109521

申请日：2014-12-16

Applicant: DANFOSS A/S

Inventor： Roozbeh Izadi-Zamanabadi

IPC: F25B49/02

CPC classification number: F25B49/02 ,  F25B2500/19 ,  F25B2500/28 ,  F25B2600/21 ,  F25B2600/2513 ,  F25B2700/21171

Abstract: A method for controlling a supply of refrigerant to an evaporator (2) of a vapour compression system (1), such as a refrigeration system, an air condition system or a heat pump. The opening degree of the expansion valve (3) is controlled on the basis of an air temperature, Tair, of air flowing across the evaporator (2), and in order to reach a reference air temperature, Tair, ref. The opening degree is set to the calculated opening degree, overlaid with a perturbation signal. A temperature signal, S2, representing a temperature of refrigerant leaving the evaporator (2) is monitored and analysed. In the case that the analysis reveals that a dry zone of the evaporator (2) is approaching a minimum length, the opening degree of the expansion valve (3) is decreased. This provides a safety mechanism which ensures that liquid refrigerant is prevented from passing through the evaporator (2).

Abstract translation: 一种用于控制向诸如制冷系统，空调系统或热泵的蒸气压缩系统（1）的蒸发器（2）供应制冷剂的方法。 基于流过蒸发器（2）的空气的空气温度Tair控制膨胀阀（3）的开度，并且为了达到参考空气温度Tair，参考。 开度设定为计算开度，用扰动信号重叠。 监测并分析表示离开蒸发器（2）的制冷剂的温度的温度信号S2。 在分析显示蒸发器（2）的干燥区域接近最小长度的情况下，膨胀阀（3）的开度减小。 这提供了一种确保液体制冷剂不被通过蒸发器（2）的安全机构。

公开(公告)号：US20170328617A1

公开(公告)日：2017-11-16

申请号：US15528206

申请日：2015-10-08

Applicant: DANFOSS A/S

Inventor： Roozbeh Izadi-Zamanabadi

IPC: F25B41/06

CPC classification number: F25B41/062 ,  F25B49/02 ,  F25B2500/19 ,  F25B2500/26 ,  F25B2600/2513 ,  F25B2700/21173 ,  F25B2700/21175

Abstract: A method for controlling a supply of refrigerant to an evaporator (2) of a vapour compression system (1) is disclosed. During a system identification phase an opening degree (12) of the expansion valve (3) is alternatingly increased and decreased, and a maximum temperature difference, (S4−S2)max, between temperature, S4, of air flowing away from the evaporator (2) and temperature, S2, of refrigerant leaving the evaporator (2) is determined. During normal operation, the supply of refrigerant to the evaporator (2) is controlled by calculating a reference temperature, S2,ref, based on the monitored temperature, S4, and the maximum temperature difference, (S4−S2)max, determined during the system identification phase. The supply of refrigerant to the evaporator (2) is controlled in order to obtain a temperature, S2, of refrigerant leaving the evaporator (2) which is substantially equal to the calculated reference temperature, S2,ref.

公开(公告)号：US09791174B2

公开(公告)日：2017-10-17

申请号：US14422380

申请日：2013-07-11

Applicant: Danfoss A/S

Inventor： Roozbeh Izadi-Zamanabadi ,  Hans Joergen Jensen ,  Lars Jensen

IPC: F25B1/00

CPC classification number: F25B1/00 ,  F25B49/02 ,  F25B2345/003 ,  F25B2500/26 ,  F25B2600/05 ,  F25B2600/21 ,  F25B2600/2513 ,  F25B2700/21172 ,  F25B2700/21173 ,  F25B2700/21174 ,  F25B2700/21175

Abstract: A method for controlling a vapor compression system during start-up is disclosed. The rate of change, ΔT1, of the temperature of refrigerant entering the evaporator, and the rate of change, ΔT2, of the temperature of refrigerant leaving the evaporator are compared. Based on the comparing step, a refrigerant filling state of the evaporator is determined. The opening degree of the expansion device is then controlled according to a first control strategy in the case that it is determined that the evaporator is full or almost full, and according to a second control strategy in the case that it is determined that the evaporator is not full. Thereby it is ensured that a maximum filling degree of the evaporator is quickly reached, without risking that liquid refrigerant passes through the evaporator.

公开(公告)号：US12044450B2

公开(公告)日：2024-07-23

申请号：US17044170

申请日：2019-06-11

Applicant: Danfoss A/S

Inventor： Roozbeh Izadi-Zamanabadi ,  Carsten Mølhede Thomsen

IPC: F25B41/00 ,  F25B47/02

CPC classification number: F25B47/02 ,  F25B2700/2117

Abstract: A method for terminating defrosting of an evaporator (104) is disclosed. The evaporator (104) is part of a vapour compression system (100). The vapour compression system (100) further comprises a compressor unit (101), a heat rejecting heat exchanger (102), and an expansion device (103). The compressor unit (101), the heat rejecting heat exchanger (102), the expansion device (103) and the evaporator (104) are arranged in a refrigerant path, and an air flow is flowing across the evaporator (104). When ice is accumulated on the evaporator (104), the vapour compression system (100) operates in a defrosting mode. At least two temperature sensors (306, 307) monitor an evaporator inlet temperature, Te,in, at a hot gas inlet (304) of the evaporator (104) and an evaporator outlet temperature, Te,out, at a hot gas outlet (305) of the evaporator (104). A difference between Te,in and Te,out, is monitored and defrosting is terminated when the rate of change of the difference between Te,in and Te,out approaches zero.

公开(公告)号：US20210033325A1

公开(公告)日：2021-02-04

申请号：US17044170

申请日：2019-06-11

Applicant: Danfoss A/S

Inventor： Roozbeh Izadi-Zamanabadi ,  Carsten Mølhede Thomsen

IPC: F25B47/02

Abstract: A method for terminating defrosting of an evaporator (104) is disclosed. The evaporator (104) is part of a vapour compression system (100). The vapour compression system (100) further comprises a compressor unit (101), a heat rejecting heat exchanger (102), and an expansion device (103). The compressor unit (101), the heat rejecting heat exchanger (102), the expansion device (103) and the evaporator (104) are arranged in a refrigerant path, and an air flow is flowing across the evaporator (104). When ice is accumulated on the evaporator (104), the vapour compression system (100) operates in a defrosting mode. At least two temperature sensors (306, 307) monitor an evaporator inlet temperature, Te,in, at a hot gas inlet (304) of the evaporator (104) and an evaporator outlet temperature, Te,out, at a hot gas outlet (305) of the evaporator (104). A difference between Te,in and Te,out, is monitored and defrosting is terminated when the rate of change of the difference between Te,in and Te,out approaches zero.

公开(公告)号：US20190011156A1

公开(公告)日：2019-01-10

申请号：US16068925

申请日：2017-01-10

Applicant: Danfoss A/S

Inventor： Roozbeh Izadi-Zamanabadi

IPC: F25B41/06

Abstract: A method for controlling a supply of refrigerant to an evaporator (2) of a vapour compression system (1), such as a refrigeration system, an air condition system or a heat pump. During normal operation, the opening degree of the expansion valve (3) is controlled on the basis of an air temperature, Tair, of air flowing across the evaporator (2) and/or on the basis of superheat of refrigerant leaving the evaporator (2). In the case that at least one sensor (5, 6, 23, 24) used for obtaining Tair or the superheat is malfunctioning, operation of the vapour compression system (1) is switched to a contingency mode. A reference temperature, Tout, ref, is calculated, based on previously obtained values of a temperature, Tout, of refrigerant leaving the evaporator (2), during a predefined previous time interval, and subsequently the opening degree of the expansion valve (3) is controlled on the basis of the obtained temperature, Tout, and in order to reach the calculated reference temperature, Tout, ref, of the refrigerant leaving the evaporator (2). Efficient operation of the vapour compression system (1) is obtained, allowing changes in refrigeration load to be taken into account.