Development of Antifogging Window Technology to Reduce Air Conditioning Energy Consumption for Battery Electric Vehicles

Daiji Katsura･Tetsuya Maeda･Hiroaki Masuoka･Hiroto Matsui･Hiroya Ochiai･Tetsuya Sugimoto (Mazda)

Antifogging windows coated with water-absorbent resin can improve the cruising range and relative humidity in the cabin during winter without compromising space efficiency. In this study, we developed an antifogging window that combines water absorbency and durability, and a calculation model to derive the effect of the window on cruising range improvement. By using the model, we evaluated the effect of the improvement in cruising range in various regions of the world.

Development of Glass Heat Sensation Index Considering Short and Long Wave Radiation Wavelength Characteristics

Yoshiichi Ozeki･Miyoko Oiwake･Reika Miura･Shinya Tanaka (AGC)･Akihisa Nomoto (University of California)･Yuyuko Watanabe･Hikari Ryuuzaki･Shin-Ichi Tanabe (Waseda University)

A new index 'heat sensation index' indicating the heat sensitivity from the glass is proposed. The heat sensation index is calculated by taking into account both the spectral transmission and emission characteristics of the glass and the spectral transmission and absorption characteristics of the skin in relation to the solar radiation reaching the outer surface of the glass. In a climate laboratory conducting on an actual vehicle equipped with various types of glass, the heat sensation index showed a higher correlation more than the total solar radiation transmission Tts to the thermal sensation vote.

Refrigerant Permeability Evaluation of Low GWP Refrigerant R-474A

Shohei Ajioka･Yasutaka Negishi･Tsubasa Nakaue･Kentaro Shibata･Daisuke Karube (Daikin Industries)

As vehicles become more electrically powered, HP systems are being adopted, and refrigerants with low GWP are being considered to address global warming.
Daikin has newly developed R-474A, a mixed refrigerant with a GWP of less than 1, to solve both problems. R-474A contains the new substance R-1132(E), which raises concerns about refrigerant permeation. Therefore, the refrigerant permeability from the refrigerant hose of R-474A was examined, and the examination result is reported.

Development of Fuel Economy Prediction Method of Vehicle Installed with Turbo Charger Based on Public Specification
-Cruising Simulation with Searching of Balance Points of Gas Flowrate and Power-

Hideaki Nagano･Shota Morisaki･Itsuhei Kohri (Tokyo City University)･Yoshiichi Ozeki･Miyoko Oiwake (AGC)･Suguru Shiratori･Kenjiro Shimano (Tokyo City University)

This paper proposes a zero-dimensional model that can quantitatively analyze the effects of turbocharger recovery for predicting fuel consumption and cruising range of engine vehicles. Based on the performance of both the compressor and turbine estimated from the published specifications through similarity law of turbomachinery, the gas state in each process is estimated, and each balance point of mass flow and power is searched and determined through iterative calculation. The results clarified the operating point and the fuel consumption along with the driving status.