Browse Publications Technical Papers 2019-01-0698
2019-04-02

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 2019-01-0698

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.

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