公开(公告)号：WO2021219474A1

公开(公告)日：2021-11-04

申请号：PCT/EP2021/060484

申请日：2021-04-22

Applicant: DANFOSS A/S

Inventor： ROOZBEH, Izadi-Zamanabadi ,  ANDREASEN, Glenn ,  REICHWALD, Peter

IPC: F25B1/10 ,  F25B5/02 ,  F25B49/02 ,  F25B45/00 ,  F25B41/39

Abstract: A method for monitoring a refrigerant charge in a vapour compression system (1) is disclosed, the vapour compression system (1) comprising a compressor unit (2), a heat rejecting heat exchanger (3), a high pressure expansion device (4), a receiver (5), at least one expansion device (9, 10), and at least one evaporator (11, 12) arranged in a refrigerant path. A change in net mass flow into or out of the receiver (5) and/or a change in net enthalpy flow into or out of the receiver (5) is detected, and a pressure inside the receiver (5) is monitored as a function of time, following the detected change in net mass flow and/or in net enthalpy flow. A time constant being representative for dynamics of the receiver (5) is derived, based on the monitored pressure as a function of time, and information regarding a refrigerant charge in the vapour compression system (1) is derived, based on the derived time constant.

公开(公告)号：WO2022194489A1

公开(公告)日：2022-09-22

申请号：PCT/EP2022/054095

申请日：2022-02-18

Applicant: DANFOSS A/S

Inventor： REICHWALD, Peter ,  PRINS, Jan ,  PISCOPIELLO, Salvatore

IPC: F25B41/39

Abstract: A method for controlling a vapour compression system (1) is disclosed. The vapour compression system (1) comprises a compressor unit (2) comprising at least one main compressor (3) and at least one receiver compressor (4), a heat rejecting heat exchanger (5), a receiver (7), an expansion device (8) and an evaporator (9) being arranged in a refrigerant path. The vapour compression system (1) further comprises a bypass valve (12) fluidly interconnecting the gaseous outlet (10) of the receiver (7) and the main compressor(s) (3). A pressure difference across the bypass valve (12) is measured or derived, and a mass flow rate of refrigerant through the bypass valve (12) is derived, based at least on the pressure difference across the bypass valve (12), and using a fluid model. A minimum mass flow rate of refrigerant required to operate the receiver compressor (4) is derived, based on a minimum displacement volume of the receiver compressor (4) and using a fluid model taking prevailing operating conditions into account. In the case that the derived mass flow rate of refrigerant through the bypass valve (12) exceeds the derived minimum mass flow rate of refrigerant required to operate the receiver compressor (4), the receiver compressor (4) is started and the bypass valve (12) is closed.

公开(公告)号：WO2022194488A1

公开(公告)日：2022-09-22

申请号：PCT/EP2022/054094

申请日：2022-02-18

Applicant: DANFOSS A/S

Inventor： PRINS, Jan ,  REICHWALD, Peter ,  PISCOPIELLO, Salvatore

IPC: F25B41/39 ,  F25B49/02

Abstract: A method for controlling a vapour compression system (1) is disclosed. The vapour compression system (1) comprises a compressor unit (2) comprising at least one main compressor (3) and at least one receiver compressor (4), a heat rejecting heat exchanger (5), a receiver (7), an expansion device (8) and an evaporator (9) being arranged in a refrigerant path. The vapour compression system (1) further comprises a bypass valve (12) fluidly interconnecting the gaseous outlet (10) of the receiver (7) and the main compressor(s) (3). A first pressure setpoint for a pressure prevailing in the receiver (7) and a second pressure setpoint for the pressure prevailing in the receiver (7) are defined, the second pressure setpoint being higher than the first pressure setpoint. An opening degree of the bypass valve (12) is controlled in order to regulate the pressure prevailing in the receiver (7) in accordance with the first pressure setpoint, and in order to reach the first pressure setpoint, in the case that a load demand of the vapour compression system (1) exceeds a maximum capacity of the receiver compressor(s) (4). The opening degree of the bypass valve (12) is controlled in order to regulate the pressure prevailing in the receiver (7) in accordance with the second pressure setpoint, and in order to reach the second pressure setpoint, in the case that the receiver compressor(s) (4) is/are operating and the load demand of the vapour compression system (1) is below the maximum capacity of the receiver compressor(s) (4).

公开(公告)号：EP4143489A1

公开(公告)日：2023-03-08

申请号：EP21720470.0

申请日：2021-04-22

Applicant: Danfoss A/S

Inventor： ROOZBEH, Izadi-Zamanabadi ,  ANDREASEN, Glenn ,  REICHWALD, Peter

IPC: F25B1/10 ,  F25B5/02 ,  F25B49/02 ,  F25B45/00 ,  F25B41/39

公开(公告)号：EP4016207A1

公开(公告)日：2022-06-22

申请号：EP20215574.3

申请日：2020-12-18

Applicant: Danfoss A/S

Inventor： PRINS, Jan ,  REICHWALD, Peter ,  PISCOPIELLO, Salvatore

IPC: G05B19/042 ,  F25B49/02

Abstract: A method for configuring a plurality of operating setpoints for a vapour compression system (1) is disclosed. The plurality of operating setpoints are divided into a first group (12) of operating setpoints to be generated manually and a second group (13) of operating setpoints to be generated automatically, and the operating setpoints are operated in accordance therewith. The manually generated operating setpoints (12) and the automatically generated operating setpoints (13) are provided to a setpoint manager (11), and the setpoint manager (11) checks if the provided operating setpoints (12, 13) are in compliance with a set of rules. In the case that at least some of the provided operating setpoints (12, 13) are not in compliance with the set of rules, the setpoint manager (11) adjusts at least some of the provided operating setpoints (12, 13) in accordance with the set of rules, thereby obtaining an adjusted set of operating setpoints. The vapour compression system (1) is subsequently controlled in accordance with the adjusted set of operating setpoints.