Heat exchanger

A heat exchanger comprising:

• a plurality of fluid passages that are stacked in layers in a stacking direction that is predetermined, wherein the plurality of fluid passages are configured to conduct a fluid that has a gas phase and a liquid phase;
• and
• a tank that extends in the stacking direction of the plurality of fluid passages and is connected to the plurality of fluid passages, wherein:
• the tank has:
• a distribution space that is configured to distribute the fluid to the plurality of fluid passages;
• and
• a flow inlet that is configured to introduce the fluid into the distribution space;
• a fluid distributor, which is configured to control flow of the fluid to the plurality of fluid passages, is disposed at a location adjacent to the flow inlet of the distribution space of the tank;
• the fluid distributor has:
• a primary through-hole that is configured to guide the fluid to one or more of the plurality of fluid passages, which are connected to a downstream portion of the distribution space located on a downstream side in a flow direction of the fluid flowing in the distribution space;
• and
• a secondary through-hole that is configured to guide the fluid to another one or more of the plurality of fluid passages, which are connected to an upstream portion of the distribution space located on an upstream side in the flow direction of the fluid flowing in the distribution space;
• the primary through-hole is disposed in a center portion of the fluid distributor, wherein the center portion is formed in a predetermined range centered on a center point in a cross-section of the distribution space;
• the secondary through-hole is disposed in a peripheral portion of the fluid distributor, wherein the peripheral portion is formed in a range between an inner wall surface of the distribution space and the center portion;
• the distribution space of the tank is formed by a plurality of plate members which are respectively formed in a plate shape and are joined together in a state where the plurality of plate members are stacked in layers in the stacking direction;
• each of the plurality of fluid passages is formed between corresponding adjacent two of the plurality of plate members;
• a plurality of openings, each of which is formed by a corresponding one of the plurality of plate members at a predetermined location of the corresponding one of the plurality of plate members, are used to extend the distribution space of the tank in the stacking direction;
• and
• each of a plurality of communication portions, each of which communicates the distribution space of the tank with a corresponding one of the plurality of fluid passages, is formed over an entire circumferential extent of the tank.