Abstract: An ejector refrigeration circuit, which is configured for circulating a refrigerant, includes at least two controllable ejectors, which are connected in parallel and respectively comprise a primary high pressure input port, a secondary low pressure input port and an output port; and a control unit, which is configured for operating the ejector refrigeration circuit employing a method which includes a) operating a first ejector by controlling the opening of its high pressure port until the maximum efficiency of said first ejector has been reached or the actual refrigeration demands are met; b) operating at least one additional ejector by opening its primary high pressure input port for increasing the refrigeration capacity of the ejector refrigeration circuit in case the actual refrigeration demands are not met by operating the first ejector alone.

Abstract: An ejector refrigeration circuit (1), which is configured for circulating a refrigerant, in particular carbon dioxide, comprises at least two controllable ejectors (6, 7), which are connected in parallel and respectively comprise a primary high pressure input port (6a, 7a), a secondary low pressure input port (6b, 7b) and an output port (6c, 7c); and a control unit (28), which is configured for operating the ejector refrigeration circuit (1) employing a method which comprises the steps of: a) operating a first ejector (6) of the at least two controllable ejectors (6, 7) by controlling the opening of its high pressure port (6a) until the maximum efficiency of said first ejector (6) has been reached or the actual refrigeration demands are met; b) operating at least one additional ejector (7) of the at least two controllable ejectors (6, 7) by opening its primary high pressure input port (7a) for increasing the refrigeration capacity of the ejector refrigeration circuit (1) in case the actual refrigeration deman

Abstract: The invention relates to a refrigeration circuit with at least two compressors, each compressor comprising at least one lubrication point and at least one oil pump having an outlet for providing oil to said lubrication point; wherein the outlet of the oil pump of at least one of the compressors is fluidly connected to the lubrication point of at least one different compressor.