Method for controlling a vapour compression system at a reduced suction pressure
AssigneeDanfoss A/S
InventorsJan Prins, Lars Finn Sloth Larsen
Life of this patent
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Abstract
A method for controlling a vapour compression system (1) including a compressor unit (2) including 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).
Claims18
A method for controlling a vapour compression system comprising a compressor unit comprising one or more compressors, a heat rejecting heat exchanger, a receiver, an expansion device and an evaporator arranged in a refrigerant path, the expansion device being arranged to control a supply of refrigerant to the evaporator, the method comprising the steps of:
- obtaining a pressure value indicating a pressure prevailing inside the receiver,
- comparing the obtained pressure value to a first threshold pressure value, and
- in the case that the obtained pressure value is below the first threshold pressure value, controlling the compressor(s) of the compressor unit in order to reduce a suction pressure of the vapour compression system;
- wherein the step of controlling the compressor(s) of the compressor unit comprises adjusting a compressor capacity of the compressor unit;
- and
- wherein the step of adjusting a compressor capacity of the compressor unit comprises switching one or more compressors on or off.
A method for controlling a vapour compression system comprising a compressor unit comprising one or more compressors, a heat rejecting heat exchanger, a receiver, an expansion device and an evaporator arranged in a refrigerant path, the expansion device being arranged to control a supply of refrigerant to the evaporator, the method comprising the steps of:
- obtaining a pressure value indicating a pressure prevailing inside the receiver,
- comparing the obtained pressure value to a first threshold pressure value, and
- in the case that the obtained pressure value is below the first threshold pressure value, controlling the compressor(s) of the compressor unit in order to reduce a suction pressure of the vapour compression system;
- wherein the step of controlling the compressor(s) of the compressor unit comprises the steps of:
- reducing a suction pressure setpoint value from an initial suction pressure setpoint value, P0,set, to a reduced suction pressure setpoint value, P0,red, and
- controlling the compressor(s) of the compressor unit based on the reduced suction pressure setpoint value, P0,red.
A method for controlling a vapour compression system comprising a compressor unit comprising one or more compressors, a heat rejecting heat exchanger, a receiver, an expansion device and an evaporator arranged in a refrigerant path, the expansion device being arranged to control a supply of refrigerant to the evaporator, the method comprising the steps of:
- obtaining a pressure value indicating a pressure prevailing inside the receiver,
- comparing the obtained pressure value to a first threshold pressure value, and
- in the case that the obtained pressure value is below the first threshold pressure value, controlling the compressor(s) of the compressor unit in order to reduce a suction pressure of the vapour compression system;
- wherein the compressor unit comprises at least one main compressor being fluidly connected to an outlet of the evaporator and at least one receiver compressor being fluidly connected to a gaseous outlet of the receiver, and wherein the method further comprises the step of controlling the at least one receiver compressor based on the obtained pressure value.
Dependencies are inferred from the claim text.