PURPOSE: To obtain a heat exchanger prominent in heat transfer performance, by a method wherein slit pieces 5, cut and raised so that the leading edges thereof are opposed substantially to air stream and the cut-and-raised surfaces thereof become parallel substantially to the air stream, are provided on the surface of a fin while the slit pieces are provided with bent pieces, formed by bending the vicinity of the trailing edges of the cut-and-raised surfaces.
CONSTITUTION: Heat exchange is effected between airflow B, flowing between fins 4, and heat medium, flowing through the inside of a flat tube 1. In this case, the fins 4 are divided into small pieces in the direction of the airflow B by slit pieces 5, therefore, the growth of the temperature boundary layer (d) of the airflow B, which is generated on the surface of the fins 4, is restricted. Further, bent pieces 6 are provided near the trailing edges of cut-and-raised pieces 5" of respective slit pieces 5, therefore, the airflow B, passing the surfaces of the cut-and-raised surfaces 5" while forming the temperature boundary layers (d), collides against the bent pieces 6 whereby the airflow B is separated from the bent pieces 6 in the rear stream thereof and eddies are generated, therefore, the temperature boundary layer (d) of the airflow B is divided into small pieces perfectly and simultaneously. Furthermore, the airflow B, separated by the bent pieces 6, adheres again to the slit pieces 5 in the downstream, therefore, a very high heat transfer rate may be obtained.
| JP2014005975 | OUTDOOR EQUIPMENT FOR AIR CONDITIONER |
| JPS58130997 | HEAT EXCHANGER |
| JPS63131993 | HEAT EXCHANGER |
FUJIMOTO SHINJI
TANNO SATOSHI
IDE SHINICHI
