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Ninagawa, Toshihide
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Development of a Compact and High-Performance Radiator for Thermal Management of Environmentally-Friendly Cars

DENSO Corporation-Shota Akagi, Toshihide Ninagawa
Published 2018-04-03 by SAE International in United States
To comply with increasing fuel efficiency regulations, a low temperature radiator (LT radiator) is required to cool the charge-air system of a turbocharged engine. These engines are important to use for environmentally-friendly cars. Since heavy-duty and high-performance cars demand high cooling performance, the main radiator alone is typically insufficient in meeting the vehicle’s cooling requirements. An additional radiator installed in the front of the wheel-well is required to meet the extra cooling demand. In order to install this radiator in the front of the wheel-well, guaranteed performance in the limited packaging space and impact resistance of the leading tube edge are required. We developed the Supplementary Inner-Fin Radiator (SIR) which achieves the compact, high-performance, and durability requirements by use of an inner-fin tube (I/F tube). The purpose of this paper is to report our design approach and product specifications of the SIR. In particular, the impact resistance requirement is set from understanding the vehicle usage environment. This is an important consideration due to coolant leaks caused by damaged radiator tubes. First, we estimated the impact…
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Development of High Performance Radiators by Fin Optimization

DENSO Corp.-Osamu Hakamata
DENSO International America Inc.-Toshihide Ninagawa, Sergio Pujols
Published 2014-04-01 by SAE International in United States
Requirements for fuel economy improvement and reduction in the vehicles engine compartment have increased significantly in the pass years. Performances in radiators have driven changes in terms of compactness and weight reductions. By focusing on the air flow we have optimized the radiator fin and developed a high performance radiator. A similar performance was achieved using an 11mm core depth which has 30% weight reduction compared to a 16mm core depth. The purpose of this paper is to present a technical outline about fin optimization.
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