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Evaluation of Equivalent Temperature in a Vehicle Cabin with a Numerical Thermal Manikin (Part 2): Evaluation of Thermal Environment and Equivalent Temperature in a Vehicle Cabin

AGC Inc.-Yoshiichi Ozeki, Seiko Suzuki
Nissan Motor Co., Ltd.-Hajime Oi, Yasushi Ichikawa, Akira Matsumoto
Published 2019-04-02 by SAE International in United States
In the previous paper (Part 1), measurements of equivalent temperature (teq) using a clothed thermal manikin and modeling of the clothed thermal manikin for teq simulation were discussed. In this paper (Part 2), the outline of the proposed mesh-free simulation method is described and comparisons between teq in the calculations and measurements under summer cooling with solar radiation and winter heating without solar radiation conditions in a vehicle cabin are discussed. The key factors for evaluating teq on each body segment of the clothed thermal manikin under cooling and heating conditions are also discussed. In the mesh-free simulation, even if there is a hole or an unnecessary shape on the CAD model, only a group of points whose density is controlled in the simulation area is generated without modifying the CAD model. Therefore, the fluid mesh required by conventional CFD code is not required, and the analysis load is significantly reduced. The most advantageous point is that this mesh-free simulation method satisfies the conservation laws of mass, momentum, and energy. The cabin thermal environment and…
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Simple Prediction for Fuel Consumption and Cruising Distance of Internal Combustion Engine Vehicles with RFD Method

AGC Inc.-Miyoko Oiwake, Yoshiichi Ozeki
Tokyo City University-Hideaki Nagano, Memori Ikeda, Itsuhei Kohri
Published 2019-04-02 by SAE International in United States
In order to develop various parts and components of vehicles, understanding the effects of their structures and thermal performance on the fuel consumption and cruising distance is important. However, because of the limited information available to parts suppliers, it is not always easy to predict and study vehicle fuel efficiency and cruising range performance under arbitrary driving conditions. In this study, the authors have developed an RFD (Regression Fuel-consumption Diagram) method to predict the cruising performance of internal-combustion engine vehicles (ICEV) based only on the published information given to suppliers by using standard reference vehicles, which had been regressed and identified for control characteristics and fuel consumption diagrams. As an example of the application of the RFD method to realistic situation, the effects of the driving mode and air-conditioning on the fuel consumption of ICEV are studied. Accordingly, it was found that the influence of the air-conditioning load on the fuel consumption differs depending on the driving modes. In addition, for the validation of the standard reference models introduced in the RFD method, the influence…
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Evaluation of Equivalent Temperature in a Vehicle Cabin with a Numerical Thermal Manikin (Part 1): Measurement of Equivalent Temperature in a Vehicle Cabin and Development of a Numerical Thermal Manikin

AGC Inc.-Yoshiichi Ozeki, Seiko Suzuki
Nissan Motor Co., Ltd.-Hajime Oi, Yasushi Ichikawa, Akira Matsumoto, Fusaaki Takeo
Published 2019-04-02 by SAE International in United States
The present paper is Part 1 of two consecutive studies. Part 1 describes three subjects: definition of the equivalent temperature (teq), measurements of teq using a clothed thermal manikin in a vehicle cabin, and modeling of the clothed thermal manikin for teq simulation. After defining teq, a method for measuring teq with a clothed thermal manikin was examined. Two techniques were proposed in this study: the definition of “the total heat transfer coefficient between the skin surface and the environment in a standard environment (hcal)” based on the thermal insulation of clothing (Icl), and a method of measuring Icl in consideration of the area factor (fcl), which indicates the ratio of the clothing surface to the manikin surface area. Then, teq was measured in an actual vehicle cabin by the proposed method under two conditions: a summer cooling condition with solar radiation and a winter heating condition without solar radiation. The results showed that teq, including the effects of the air temperature, air velocity and thermal radiation, was measured properly. Subsequently, a numerical thermal manikin…
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