Danfoss A/s

Peter Reichwald

Jan Prins

Salvatore Piscopiello

Roozbeh Izadi-Zamanabadi

Glenn Andreasen

The vapour compression system includes a compressor unit having at least one main compressor and at least one receiver compressor, a heat rejecting heat exchanger, a receiver, an expansion device and an evaporator being arranged in a refrigerant path. The vapour compression system further includes a bypass valve fluidly interconnecting the gaseous outlet of the receiver and the main compressor(s). An opening degree of the bypass valve is controlled to regulate the pressure prevailing in the receiver in accordance with a first pressure setpoint when a load demand of the vapour compression system exceeds a maximum capacity of the receiver compressor(s). The opening degree of the bypass valve is controlled to regulate the pressure prevailing in the receiver in accordance with a second pressure setpoint when the receiver compressor(s) is/are operating and the load demand of the vapour compression system is below the maximum capacity of the receiver compressor(s).

Method for controlling a vapour compression system with a bypass valve

A method for monitoring a refrigerant charge in a vapour compression system () is disclosed, the vapour compression system () including a compressor unit (), a heat rejecting heat exchanger (), a high pressure expansion device (), a receiver (), at least one expansion device (), and at least one evaporator () arranged in a refrigerant path. A change in net mass flow into or out of the receiver () and/or a change in net enthalpy flow into or out of the receiver () is detected, and a pressure inside the receiver () 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 () is derived, based on the monitored pressure as a function of time, and information regarding a refrigerant charge in the vapour compression system () is derived, based on the derived time constant.

Method for monitoring a refrigerant charge in a vapour compression system

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

Growing community of inventors

Nordborg, Denmark

Peter Reichwald