Ejector refrigeration circuit

A method of operating an ejector refrigeration circuit with:

• a high pressure ejector circuit comprising in the direction of flow of a circulating refrigerant:
• a heat rejecting heat exchanger having an inlet side and an outlet side;
• at least two variable ejectors with different capacities and connected in parallel, each of the at least two variable ejectors comprising a controllable motive nozzle, a primary high pressure input port, a secondary low pressure input port, and an output port;
• wherein the primary high pressure input ports of the at least two variable ejectors are fluidly connected to the outlet side of the heat rejecting heat exchanger;
• a receiver, having an inlet, a liquid outlet, and a gas outlet, wherein the inlet is fluidly connected to the output ports of the at least two variable ejectors;
• at least one compressor having an inlet side and an outlet side, the inlet side of the at least one compressor being fluidly connected to gas outlet of the receiver, and the outlet side of the at least one compressor being fluidly connected to the inlet side of the heat rejecting heat exchanger;
• and
• a refrigerating evaporator flowpath comprising in the direction of flow of the circulating refrigerant:
• at least one expansion valve having an inlet side fluidly connected to the liquid outlet of the receiver, and an outlet side;
• at least one refrigeration evaporator fluidly connected between the outlet side of the at least one expansion valve and the secondary low pressure input ports of the at least two variable ejectors;
• wherein the method includes selectively operating and/or controlling the motive nozzle of at least one of the at least two variable ejectors.

An ejector refrigeration circuit with:

• a high pressure ejector circuit comprising in a direction of flow of a circulating refrigerant:
• a heat rejecting heat exchanger having an inlet side and an outlet side;
• at least two variable ejectors with different capacities connected in parallel, each of the at least two variable ejectors comprising a controllable motive nozzle, a primary high pressure input port, a secondary low pressure input port and an output port;
• wherein the primary high pressure input ports of the at least two variable ejectors are fluidly connected to the outlet side of the heat rejecting heat exchanger;
• a receiver, having an inlet, a liquid outlet, and a gas outlet, wherein the inlet is fluidly connected to the output ports of the at least two variable ejectors;
• at least one compressor having an inlet side and an outlet side, the inlet side of the at least one compressor being fluidly connected to the gas outlet of the receiver, and the outlet side of the at least one compressor being fluidly connected to the inlet side of the heat rejecting heat exchanger;
• a refrigerating evaporator flowpath comprising in the direction of flow of the circulating refrigerant:
• a first expansion valve having an inlet side, fluidly connected to the liquid outlet of the receiver, and an outlet side;
• a first refrigeration evaporator fluidly connected between the outlet side of the at least one expansion valve and the secondary low pressure input ports of the at least two variable ejectors;
• and
• at least one low temperature circuit which is connected between the liquid outlet of the receiver and the inlet side of the at least one compressor and comprises in the direction of flow of the circulating refrigerant:
• a second expansion valve different than the first expansion valve;
• at least one low temperature evaporator different than the first refrigeration evaporator;
• and
• at least one low temperature compressor different than the at least one compressor.