A refrigeration system in which refrigerant compressed by a compressor is condensed by a condenser into a condensed refrigerant, then said condensed refrigerant is passed through a decompressing device into a decompressed refrigerant, and thereafter said decompressed refrigerant is evaporated by an evaporator and then returns to said compressor, an evaporator, comprising:
- a core including an upstream-side heat exchanging tube group and a downstream-side heat exchanging tube group arranged front and rear, each of said heat exchanging tube groups including a plurality of heat exchanging tubes disposed parallel with each other at certain intervals;
- an inlet-and-outlet-side header member disposed along one end side of both said heat exchanging tube groups;
- and
- a refrigerant-turn-side header member disposed along the other end side of both said heat exchanging tube groups,
- wherein an inside of said inlet-and-outlet-side header member is divided front and rear by a partition into a front-side portion and a rear-side portion, wherein said front-side portion constitutes an inlet-side tank and said rear-side portion constitutes an outlet-side tank,
- wherein one end of each of said heat exchanging tubes constituting said upstream-side heat exchanging tube group is connected to said inlet-side tank of said inlet-and-outlet-side header member, while the other end thereof is connected to said refrigerant-turn-side header member, and
- wherein one end of each of said heat exchanging tubes constituting said downstream-side heat exchanging tube group is connected to said outlet-side tank of said inlet-and-outlet-side header member, while the other end thereof is connected to said refrigerant-turn-side header member,
- whereby refrigerant flowed into said inlet-side tank is introduced into said outlet-side tank via said upstream-side heat exchanging tube group, said refrigerant-turn-side member and said downstream-side heat exchanging tube group, while said refrigerant passing through both said heat exchanging tube groups evaporates by exchanging heat with ambient air, and
- wherein said inlet-side tank is provided with refrigerant distributing resistance means configured to distribute said refrigerant evenly into said heat exchanging tubes constituting said downstream-side heat exchanging tube group.