T.rad Co., Ltd.

Kazuo Maegawa

Atsushi Okubo

Taiji Sakai

Takuya Bungo

Hirohito Sugimoto

Hirotaka Ueki

Masahito Sekiya

A corrugated fin heat exchanger is provided in which the direction in which louvers are cut and raised is inclined in one direction only, and in which heat transfer performance is improved above that of conventional fins. To accomplish this, the relationship H&#x3e;Qup/(Qup&#x2212;1)&#xd7;&#x394;H is satisfied. H represents the core height of the heat exchanger, Qup represents the ratio of the amount of heat exchanged per corrugation between one-directional louver fins and multi-directional louver fins in an airflow part, and &#x394;H represents the amount of increase in a heat transfer reduction region of a heat exchanger core as a result of changing from multi-directional louver fins to one-directional louver fins.

Heat exchanger core

A flat tube for a header-plateless heat exchanger has an inner plate and an outer plate that are each press-molded from a metal plate and are curved/folded into a groove shape comprising a groove bottom section and two side wall sections. Both plates are such that the outer plate is fitted to the outside of the inner plate in a manner such that the groove bottom sections oppose each other, and an expanded opening in the thickness direction is formed at both ends of the plates.

Flat tube for header-plateless heat exchanger

Growing community of inventors

Tokyo, Japan

Kazuo Maegawa