Heat Transfer Augmentation of Mechanically Assembled Heat Exchanger by Internally Finned Tubes

Mechanically Assembled Heat Exchangers (MAHE) find wide applications in Automotive field, specially for Air Conditioning and Engine Cooling Systems. To improve the performance of MAHE with round tubes, new types of tubes with straight internal fins have been designed and realized, along with a new expansion tooling which allows to expand these types of tubes without destroying the internal fins.

The purpose of this paper is to present a MAHE, developed for automotive use, with aluminum round tube internally finned, the technique of assembling tube-fin, the effects of the finned tube on the performances and its possible applications.