“…The non-transparent materials, however, mainly include the door panels on both sides and the roof, which block direct solar radiation from entering the passenger compartment. 32,33 For transparent materials, we can ignore the internal thermal conductivity of the glass. For the solar radiation energy, on the transparent glass material, part of the energy q trans transferred directly through the glass into the passenger compartment is absorbed by the compartment material, as shown in eqn (11).…”