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The transmissive and reflective performance of the glass according to the radiation sources are discussed for the accurate evaluation of the solar radiation through the glass window. They are quite different in radiation sources such as solar radiation from the sun or infrared solar lamps in the experiments because of the spectral properties of both glass and radiation sources. It is also discussed how differences of transmissive and reflective performance of the glass affect thermal comfort of car occupants. A numerical simulation method based on the comprehensive combined analysis with thermoregulation model within a human body, radiation models including thermal radiation and solar radiation, and CFD (Computational Fluid Dynamics) is conducted for this purpose.