Heat exchanger and refrigeration cycle apparatus

A heat exchanger comprising:

• a fin extending in a widthwise direction along an air flow direction and extending in a longitudinal direction crossing the air flow direction;
• and
• a heat transfer tube passing through the fin,
• the fin having a through hole,
• the heat transfer tube being inserted into the through hole,
• the fin comprising
• a planar portion, and
• a first protruding portion and a second protruding portion protruding from the planar portion,
• the first protruding portion being curved along the longitudinal direction,
• the second protruding portion having an extending portion extending in the longitudinal direction,
• the extending portion being located to overlap a center of the through hole in the widthwise direction, and
• the second protruding portion being located between the first protruding portion and the through hole and surrounding the through hole.

A heat exchanger comprising:

• a fin extending in a widthwise direction along an air flow direction and extending in a longitudinal direction crossing the air flow direction;
• and
• a heat transfer tube passing through the fin,
• the fin having a through hole,
• the heat transfer tube being inserted into the through hole,
• the fin comprising
• a planar portion, and
• a first protruding portion and a second protruding portion protruding from the planar portion,
• the first protruding portion being curved along the longitudinal direction,
• the second protruding portion having an extending portion extending in the longitudinal direction,
• the extending portion being located to overlap a center of the through hole in the widthwise direction,
• the second protruding portion extending linearly in the longitudinal direction, and
• the second protruding portion being located to be displaced from the first protruding portion in the widthwise direction.

A heat exchanger comprising:

• a fin extending in a widthwise direction along an air flow direction and extending in a longitudinal direction crossing the air flow direction;
• and
• a heat transfer tube passing through the fin,
• the fin having a through hole,
• the heat transfer tube being inserted into the through hole,
• the fin comprising
• a planar portion, and
• a first protruding portion and a second protruding portion protruding from the planar portion,
• the first protruding portion being curved along the longitudinal direction,
• the second protruding portion having an extending portion extending in the longitudinal direction,
• the extending portion being located to overlap a center of the through hole in the widthwise direction,
• the fin comprising
• a first region without the through hole in the widthwise direction, and
• a second region with the through hole in the widthwise direction,
• in the first region, a first area of the first protruding portion and the second protruding portion extending in the widthwise direction being larger than a second area of the first protruding portion and the second protruding portion extending in the longitudinal direction, and
• in the second region, the first area being smaller than the second area.