Application of Numerical Boiling Heat Transfer Model to Pin-Fin Heat-Exchanger

Yoshiki Tanaka･Takaya Sato･Takeshi Ooyama (DENSO TECHNO)･Yukinori Hamaji･Masayuki Tokitani (National Institute of Fusion Science)･Yoshiyuki Tsuji (Nagoya University)

As the expectation for boiling cooling increases in response to high heat generation density of devices, there are few examples of numerical analysis and experimental verification of boiling heat transfer in mass-produced finned heat exchangers. This study aims to validate the accuracy of numerical analysis using existing boiling heat transfer models by comparing results with convective boiling experiments conducted in a pin-fin channel, a representative example of finned heat exchangers.

Utilization of the 1D Vehicle Model for the Development of the Thermal Management System for Battery Electric Vehicles

Motomasa Iizuka (SOKEN)･Tetsuma Takeda･Takayoshi Kojima (DENSO)

As part of our efforts to address the challenges of extending the range and reducing the charging time of Battery Electric Vehicles (BEVs), we have developed an environment where the performance of vehicles in the development stage can be estimated using a 1D vehicle model. This report presents a case study of its application to winter heating scenarios.

Self-decomposition evaluation of R-1132(E) mixed refrigerants

Takashi Usui･Tomoyuki Goto･Yasufu Yamada･Tomohito Inoue･Aoi Yamaguchi･Yasutaka Negishi (Daikin Industries, LTD.)

We have developed HFO refrigerant R-1132(E), which is low GWP and efficiency, and proposed blend refrigerants R-474A and R-479A. R-1132(E) has a characteristic of self-decomposition in the presence of an energy source, so we reported the boundary of self-decomposition and results of arc discharge energy inside a compressor at 2024 JSAE congress(autumn). In this paper, the effects of temperature, pressure, ratio, and energy source for the occurrence of self-decomposition, are examined in detail.

Modeling of short circuits and arc discharge energy prediction in automotive electric compressors

Kengo Nagai･Yota Omizu (Nagoya University)･Yasutaka Negishi･Tomoyuki Goto･Takashi Usui (Daikin Industries, LTD.)･Koichi Shigematsu･Jun Imaoka･Masayoshi Yamamoto (Nagoya University)

The HFO refrigerant R-1132(E) has low GWP and high performance, but self-decomposition occurs when external energy is input.In this paper, we used measured compressor parameters to simulate the arc discharge energy during a short circuit that induces self-decomposition.We also compared the amount of energy with actual measurements to verify its validity.