Proposal of Glass Heat Sensation Index Considering Short and Long Wave Radiation Wavelength Characteristics

Abstract

A new index 'Heat Sensation Index (HSI)' is proposed to more accurately reflect the human thermal sensitivity to glass. This index is calculated by taking into account both the spectral transmission and emission characteristics of the glass as well as the spectral transmission and absorption characteristics of the human skin, in relation to the solar radiation reaching the outer surface of the glass. To validate the HSI, we conducted an experiment on a real vehicle with various types of glass in a climate laboratory. The results showed that the HSI correlates more closely with the thermal sensation of the participants than the total solar transmittance Tts, which is the conventional index to assess thermal performance of glass.