This content is not included in your SAE MOBILUS subscription, or you are not logged in.
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
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 02, 2019 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
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 the teq of the clothed thermal manikin, based on the 3D-laser scanned clothing surface, are calculated under cooling condition with solar radiation and under heating condition without solar radiation. The calculated results are compared with measurements, indicating that they reproduce the measurements on the whole. Particularly, the calculated teq on each body segment of the clothed thermal manikin is consistent with measurements within 3oC, which indicates that this method can evaluate the thermal sensation within an accuracy of 1 point on the ASHRAE 7-point scale. To evaluate the teq on each body segment accurately, the accuracy of the convective heat transfer on the upper segment of the clothed thermal manikin is significant for the cooling condition, whereas the accuracy of the radiant heat transfer on the upper segment is significant for the heating condition.
CitationOzeki, Y., Oi, H., Ichikawa, Y., Matsumoto, A. et al., "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," SAE Technical Paper 2019-01-0698, 2019, https://doi.org/10.4271/2019-01-0698.
Data Sets - Support Documents
|Unnamed Dataset 1|
|Unnamed Dataset 2|
- ISO14505-2 2006
- Nilsson , H.O. 2004
- Stancato , F. , Conceicao , S. , Papa , R. , and Santos , L. CFD Thermal Comfort in Aircraft Cabin, a Comparative Study SAE Technical Paper 2015-01-2561 2015 10.4271/2015-01-2561
- Kaushik , S. , Han , T. , and Chen , K.H. Development of a Virtual Thermal Manikin to Predict Thermal Sensation in Automobiles SAE Technical Paper 2012-01-0315 2012 10.42781/2012-01-0315
- Nagano , H. , Kobayashi , Y. , Kawanago , T. , Kohri , I. et al. Prediction of Convective Heat Transfer Coefficient for Ruck and Asperity of Clothing Surface Proceedings of Ambience14 & 10i3m 2014
- Hepokoski , M. , Curran , A. , and Schwenn , T. A Comparison of Physiology-Based Metrics to Environment-Based Metrics for Evaluating Thermal Comfort SAE Technical Paper 2013-01-0844 2013 10.4271/2013-01-0844
- Chen , K.H. , Kaushik , S. , Han , T. , Ghosh , D. et al. Thermal Comfort Prediction and Validation in a Realistic Vehicle Thermal Environment SAE Technical Paper 2012-01-0645 2012 10.4271/2012-01-0645
- Ghosh , D. , Wang , M. , Chen , K.H. , Kaushik , S. et al. Energy Efficient HVAC System with Spot Cooling in an Automobile - Design and CFD Analysis SAE Int. J. Passeng. Cars - Mech. Syst. 5 2 885 903 2012 10.4271/2012-01-0641
- Sato , H. et al.
- Inoue , M. et al.
- Oi , H. , Yonetsu , H. , and Ozeki , Y. Analysis of Equivalent Temperature Inside Vehicles Using Mesh-Free Simulation (1st Report-3rd Report) Japan Society of Automotive Engineers Annual Congress 2018
- Saito , T. et al.
- Yanagihara , K. et al.
- Yanagihara , K. et al.
- Ozeki , Y. , Takabayashi , T. , and Tanabe , S. SAE Technical Paper 2003-01-1074 2003 10.4271/2003-01-1074