公开(公告)号：WO2021032810A1

公开(公告)日：2021-02-25

申请号：PCT/EP2020/073269

申请日：2020-08-19

Applicant: DANFOSS A/S

Inventor： LUND, Thomas

IPC: F25B43/00

Abstract: A refrigerant system (1) is described comprising a refrigerant circuit having a first heat exchanger (2), a compressor (3), a second heat exchanger (4) and a gas/fluid separator (5) comprising an inlet (12) connected to a refrigerant outlet of the first heat exchanger and an outlet (13) connected to the compressor (3). It should be possible to remove liquid from a refrigerant flow even with a limited size of the separator. To this end, the separator (5) comprises at least two flow paths arranged in parallel between the inlet (12) and the outlet (13) of the separator (5).

公开(公告)号：WO2020177975A1

公开(公告)日：2020-09-10

申请号：PCT/EP2020/053078

申请日：2020-02-07

Applicant: DANFOSS A/S

Inventor： STEFFENSEN, Martin Munkebo ,  NIELSEN, Nicolai Birkemose

IPC: H04W52/02

Abstract: The invention relates to a battery powered device for communicating with an access point device (34) of a communication network (36), the device (10) comprising: a communication unit (12) for communicating with the access point device (34); a processing unit (14) for controlling the communication unit (12); wherein the communication unit (12) comprises an active mode and a low power mode; wherein the communication unit (12) is further configured to provide a lost registration signal (46) indicating that the communication unit (12) is not registered at the access point device (34); wherein the processing unit (14) is configured to receive the lost registration signal (46); wherein, upon reception of the lost registration signal (46), the processing unit (14) is further configured to provide a release signal (48) to the communication unit (12), wherein the release signal (48) forces the communication unit (12) to stop communication or to detach from the access point device (34); wherein, upon reception of the lost registration signal (46), the processing unit (14) is further configured to provide a low power mode signal (50), wherein the low power signal transfers the communication unit (12) into the low power mode, wherein the processing unit (14) is further configured to provide an attach signal to the communication unit (12) after a predefined waiting period (54), wherein the attach signal transfers the communication unit (12) to the active mode and which orders the communication unit (12) to get a registration or to establish a connection to the access point device (34). The access point device (34) will therefore grant the communication unit (12) a higher priority for establishing a connection than if the communication unit (12) was not registered or detached for just a short period. Thus, after the waiting period the communication unit (12) will likely require a smaller number of connection attempts than without the waiting period. Since each connection attempt consumes a certain amount of battery power, the communication unit (12) will consume less battery power than without the waiting period. Over the lifetime of the device (10), this will significantly increase the lifetime of the battery and the device (10).

公开(公告)号：WO2020169220A1

公开(公告)日：2020-08-27

申请号：PCT/EP2019/079824

申请日：2019-10-31

Applicant: DANFOSS A/S

Inventor： AHMED, Shaheer ,  VESTERGAARD, Niels P

IPC: F16K15/02 ,  F16K15/06 ,  F16K17/04 ,  F25D21/00

Abstract: A defrost check valve (2) is described comprising an inlet (3), an outlet (4), a valve seat element (5) forming a valve seat (6) and surrounding a channel (11) connected to the inlet (3), a valve element (7) moveable in a moving direction (16), and a closing spring (8) acting on the valve element (7) in a direction towards the valve seat element (5), wherein the valve element (7) comprises a first pressure area (12) which in a closed condition of the valve is limited by the valve seat (6). Such a defrost check valve (2) should have a higher differential pressure for opening and it must open for almost full flow at a slightly higher pressure difference. To this end a pressure chamber (15) is formed between the valve element (7) and the valve seat element (5) outside the first pressure area (12) and the valve element comprises a second pressure area (20) in the pressure chamber.

公开(公告)号：WO2020109214A1

公开(公告)日：2020-06-04

申请号：PCT/EP2019/082381

申请日：2019-11-25

Applicant: DANFOSS A/S

Inventor： VESTERGAARD, Niels P. ,  VAN BEEK, Johan

IPC: F25B41/06

Abstract: The invention relates to a sensor arrangement for providing a sensor signal S indicative of a vapor quality X of a medium flowing within a conduit (38a). A sensor comprising a heating element and a temperature sensing element is arranged in thermal contact with a wall of a horizontally arranged portion (38a) of the conduit (34). Processing means are disposed to deliver a sensor signal S based on an output of the temperature sensing element (52).The sensor (40) comprises a sensor body (46) made of a metal material. The heating element (48) and the temperature sensing element (52) are arranged in thermal contact with the sensor body (46). The invention further relates to a cooling system (10) including at least one evaporator (32) for evaporating an ammonia refrigerant, at least one compressor (12) arranged to compress the evaporated refrigerant, and at least one condenser (18) for condensing the compressed refrigerant, and at least one evaporator pump (30) for pumping the condensed refrigerant to the evaporator (32). A sensor arrangement (50) is arranged at a conduit (34) conducting the refrigerant from at least a portion of the evaporator (32).

公开(公告)号：WO2020064351A1

公开(公告)日：2020-04-02

申请号：PCT/EP2019/074352

申请日：2019-09-12

Applicant: DANFOSS A/S

Inventor： PRINS, Jans ,  LARSEN, Lars Finn Sloth

IPC: F25B49/02

Abstract: A method for controlling a vapour compression system (1) comprising a compressor unit (2) comprising 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：WO2019243561A1

公开(公告)日：2019-12-26

申请号：PCT/EP2019/066443

申请日：2019-06-21

Applicant: DANFOSS A/S

Inventor： IZADI-ZAMANABADI, Roozbeh ,  THOMSEN, Carsten Mølhede

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 one temperature sensor (305) monitors a temperature T air , of air leaving the evaporator (104). A rate of change of T air is monitored and defrosting is terminated when the rate of change of the temperature, T air , approaches zero.

公开(公告)号：WO2019115555A1

公开(公告)日：2019-06-20

申请号：PCT/EP2018/084415

申请日：2018-12-11

Applicant: DANFOSS A/S

Inventor： VAN BEEK, Johan ,  PETERSEN, Hans Kurt ,  JENSEN, Leo Finn ,  BIRKELUND, Michael

IPC: F16K27/00 ,  F16K31/40 ,  F25B13/00 ,  F16K11/24 ,  F24F1/32

CPC classification number: F16K27/003 ,  F16K11/24 ,  F16K31/408 ,  F24F1/32

Abstract: A valve arrangement (1) for an operation mode selector is described, the valve arrangement comprising at least two valve modules (2), each of the valve modules comprising a housing section (3), a first mode selector valve (9) connecting a discharge conduit (7) and an evaporator conduit (19) and a second mode selector valve (10) connecting a suction conduit (8) and the evaporator conduit, the first mode selector valve and the second mode selector valve being connected by the housing section, and the valve modules being arranged side by side in a direction parallel to the discharge conduit and/or the suction conduit, wherein the evaporator conduit extends from the housing section in an area which is limited by a first plane (34) through the discharge conduit and a second plane (35) through the suction conduit and parallel to the first plane, and wherein the discharge conduit and the suction conduit are common for all of the valve modules. Such a valve arrangement should be made compact. To this end, for each valve module, the housing section is part of a housing, the housing comprising a discharge port (4), a suction port (5), and an evaporator port (6), wherein the discharge port is connected to the discharge conduit, and wherein the suction port is connected to the suction conduit.

公开(公告)号：WO2018192827A1

公开(公告)日：2018-10-25

申请号：PCT/EP2018/059330

申请日：2018-04-11

Applicant: DANFOSS A/S

Inventor： LUCKMANN, Ejnar ,  JENSEN, Lars

IPC: H04L12/28 ,  H04L29/08 ,  G05B19/418

Abstract: A control system (1) for controlling a cooling system comprising two or more cooling entities (2) is disclosed. The control system comprises a central control unit (3), two or more entity controllers (4), each entity controller (4) being associated with one of the cooling entities (2), and each entity controller (4) being provided with a nearfield communication interface (6) allowing communication between the entity controller (4) and a portable device (7), via a nearfield communication channel, and a secured communication network (5) connecting the central control unit (3) with each of the entity controllers (4). The central control unit (3) is configured to generate blocking signals and/or unblocking signals and communicate the blocking signals and/or unblocking signals to each of the entity controllers (4), via the secured communication network (5). Each of the entity controllers (4) is configured to block and/or unblock the nearfield communication interface (6), in accordance with received blocking signals and/or unblocking signals.

公开(公告)号：WO2018095787A1

公开(公告)日：2018-05-31

申请号：PCT/EP2017/079360

申请日：2017-11-15

Applicant: DANFOSS A/S

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

IPC: 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：WO2018095785A1

公开(公告)日：2018-05-31

申请号：PCT/EP2017/079358

申请日：2017-11-15

Applicant: DANFOSS A/S

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

IPC: F25B41/06 ,  F25B49/02

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, 4) 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.