Refrigeration system and heat exchanger thereof

A refrigeration system, comprising a compressor, a micro-channel condenser, a micro-channel evaporator and at least one throttling device which are connected by pipelines, each of the micro-channel condenser and the micro-channel evaporator comprising an inlet manifold and an outlet manifold, a first plurality of flat tubes being connected between the inlet manifold and the outlet manifold of the micro-channel condenser and in communication with the inlet manifold and the outlet manifold of the micro-channel condenser, and a second plurality of flat tubes being connected between the inlet manifold and the outlet manifold of the micro-channel evaporator and in communication with the inlet manifold and the outlet manifold of the micro-channel evaporator;

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• the throttling device is arranged at the pipeline between the micro-channel condenser and the micro-channel evaporator, the inlet manifold of the micro-channel evaporator is provided with at least one first baffle, the number of the at least one first baffle is n and n is greater than or equal to one, and the inlet manifold of the micro-channel evaporator is divided by the n baffle into at least two manifold sections arranged in order, the number of the manifold sections of the micro-channel evaporator is (n+1), and the adjacent manifold sections of the inlet manifold of the micro-channel evaporator are isolated from each other by the at least one first baffle;
• each of the manifold sections of the inlet manifold of the micro-channel evaporator is in communication with a specific number of the at least one first flat tubes and is provided with at least one connecting port configured to be in communication with the respective pipeline, and each of the manifold sections of the inlet manifold of the micro-channel evaporator is not provided with a distribution pipe configured to distribute flow rate into the flat tubes in communication with the manifold sections of the inlet manifold of the micro-channel evaporator,
• a ratio of a length L1 of the manifold section of the micro-channel condenser in communication with the manifold section in the middle portion of the inlet manifold of the micro-channel evaporator by the branch pipeline, to the number n1 of the flat tubes in communication with the manifold section in the middle portion of the micro-channel evaporator is L1/n1, a ratio of a length L2 of the manifold section of the micro-channel condenser in communication with the manifold section deviating from the middle portion of the inlet manifold of the micro-channel evaporator, to the number n2 of the flat tubes in communication with the manifold section deviating from the middle portion of the inlet manifold of the micro-channel evaporator, is L2/n2, and the ratio of L1/n1 is greater than or equal to the ratio L2/n2.