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To improve the performance of the air conditioning evaporator, we have Introduced unique refrigerant circuit. This circuit has refrigerant paths for both upstream and downstream air, and these paths are overlapped to provide uniform temperature distribution at the cooling air side. In addition, the fin pitch has also been minimized by establishing a drainage improvement technology. These technologies have made a great contribution to minimizing the core depth of evaporators.

A highly corrosion resistant drawn cup type evaporator was developed. During the development of this evaporator, the corrosion characteristics of evaporators in the field were examined in detail. Profound understanding of the corrosion mechanism led to the development of a new, unique, corrosion test method which simulates the actual evaporator field service environment. The main factors involved in increasing the corrosion resistance of the brazing sheet are (1) reduction of iron and silicon content in the core alloy and, (2) addition of titanium to the core alloy. In the present alloy, titanium content varies lamellarly through the thickness of the core alloy. Regions of high titanium content have a more cathodic potential, thus causing corrosion to proceed along the low titanium content lamellae. Consequently, the reduced iron and silicon contents, and the titanium addition, have the net effect of reducing the pitting corrosion rate.