PURPOSE: To reduce a dead water area, generated in the rear flow of a heat transfer tube and improve the heat exchanging efficiency of the title heat exchanger by a method wherein the heat transfer tubes are penetrated orthogonally to plate type fins through which the airflow flows while dammy rods are provided in parallel at the downstream side of the rear parts.
CONSTITUTION: Refrigerant flows through the inside of a heat transfer tube 31 and the heat of the refrigerant is transferred from a fin collar 12, contacted closely and fixed to the heat transfer tube 13. When gas flows to pass the fin 11 from a direction shown by an arrow sign 15 in a diagram, the give-and- take of heat is effected due to a temperature difference among the gas, the fin 11 and the heat transfer tube 13 and thus heat exchange between the refrigerant and the gas is effected continuously. In this case, the gas collides against dammy rods 16 whereby the gas can be turned about the heat transfer tube 13 into the rear stream of the same and, as a result, a dead water area 14, generated in the rear stream of the heat transfer tube 13, may be reduced remarkably than the same generated so far. The dammy rod 16 is preferable to be constituted of a material having very small heat transfer coefficient.
KOMA HACHIRO
KATO KAORU
