公开(公告)号：US12281826B2

公开(公告)日：2025-04-22

申请号：US17920947

申请日：2021-04-22

Applicant: Danfoss A/S

Inventor： Roozbeh Izadi-Zamanabadi ,  Glenn Andreasen ,  Peter Reichwald

IPC: F25B45/00 ,  F25B49/02

Abstract: A method for monitoring a refrigerant charge in a vapour compression system (1) is disclosed, the vapour compression system (1) including 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.