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Among aluminum heat exchangers used for automotive air conditioning, the evaporator is located in the instrument panel. We have developed a new evaporator by: 1) improving the heat transfer performance through use of thinner tubes and fins; 2) establishing technologies for improving corrosion resistance and enabling reduction in wall thickness (development of highly corrosion-resistant material and control of Zn diffusion by shortening brazing time); and 3) improving refrigerant distribution in the tanks. The new evaporator is equivalent to our conventional MS Evaporator (of Multi-Tank Super-Slim Structure)(1) in cooling performance and corrosion resistance, while being significantly thinner (35% reduction) and lighter in weight (40% reduction).

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.