Heat exchanger and refrigeration cycle apparatus

A heat exchanger comprising:

• a plurality of flat heat-transfer tubes each formed in a flat shape in cross-section, provided with a plurality of flow passages formed by through holes, disposed to stand in an up-down direction, and placed side by side and spaced from one another in a direction orthogonal to a direction of flow of air;
• and
• a corrugated fin placed between the plurality of flat heat-transfer tubes,
• the corrugated fin being formed such that fin sections that are plate-shaped are joined together one after another in a wave shape in a tube axial direction of the plurality of flat heat-transfer tubes,
• the fin sections each having
• a drain slit formed such that the drain slit extends in a tube side-by-side placement direction that is a direction in which the plurality of flat heat-transfer tubes are placed side by side and through which water on an upper surface of the fin section falls for drainage, and
• a plurality of louvers each having a louver slit extending in the tube side-by-side placement direction and a plate portion inclined to a flat-plate portion that is tabular-shaped in the fin section,
• the plurality of louvers being divided into a first louver group formed further upstream in the direction of flow of air than the drain slit and a second louver group formed further downstream in the direction of flow of air than the drain slit,
• the plate portions of the first louver group and the plate portions of the second louver group being inclined to the flat-plate portion and inclined in respective directions that are opposite to each other,
• the drain slit comprising a plurality of drain slits formed between the first louver group and the second louver group at an interval in the direction of flow of air,
• the plurality of flat heat-transfer tubes are placed in a plurality of rows and are spaced from one another in the direction of flow of air,
• the corrugated fin is provided commonly for the plurality of rows,
• the corrugated fin has the plurality of louvers and the plurality of drain slits formed in correspondence with each adjacent two of the plurality of rows,
• a plurality of interrow drain slits are formed in a position corresponding to a space between adjacent two of the plurality of rows in the direction of flow of air, and
• wherein when AA is an opening area of one of the plurality of drain slits formed in a middle of the first louver group in the direction of flow of air, AB is an opening area of one of the plurality of drain slits formed in a middle of the second louver group in the direction of flow of air, and Ac is an opening area of the interrow drain slit, AC>AA+AB is satisfied.

A heat exchanger comprising:

• a plurality of flat heat-transfer tubes each formed in a flat shape in cross-section, provided with a plurality of flow passages formed by through holes, disposed to stand in an up-down direction, and placed side by side and spaced from one another in a direction orthogonal to a direction of flow of air;
• and
• a corrugated fin placed between the plurality of flat heat-transfer tubes,
• the corrugated fin being formed such that fin sections that are plate-shaped are joined together one after another in a wave shape in a tube axial direction of the plurality of flat heat-transfer tubes,
• the fin sections each having
• a drain slit formed such that the drain slit extends in a tube side-by-side placement direction that is a direction in which the plurality of flat heat-transfer tubes are placed side by side and through which water on an upper surface of the fin section falls for drainage, and
• a plurality of louvers each having a louver slit extending in the tube side-by-side placement direction and a plate portion inclined to a flat-plate portion that is tabular-shaped in the fin section,
• the plurality of louvers being divided into a first louver group formed further upstream in the direction of flow of air than the drain slit and a second louver group formed further downstream in the direction of flow of air than the drain slit,
• the plate portions of the first louver group and the plate portions of the second louver group being inclined to the flat-plate portion and inclined in respective directions that are opposite to each other,
• the drain slit comprising a plurality of drain slits formed between the first louver group and the second louver group at an interval in the direction of flow of air,
• the plurality of flat heat-transfer tubes are placed in a plurality of rows and are spaced from one another in the direction of flow of air,
• the corrugated fin is provided commonly for the plurality of rows,
• the corrugated fin has the plurality of louvers and the plurality of drain slits formed in correspondence with each adjacent two of the plurality of rows,
• a plurality of interrow drain slits are formed in a position corresponding to a space between adjacent two of the plurality of rows in the direction of flow of air, and
• wherein
• the plurality of drain slits comprises one drain slit formed in a middle of the first louver group in the direction of flow of air and one drain slit formed in a middle of the second louver group in the direction of flow of air, and
• the interrow drain slit comprises a plurality of interrow drain slits.