As a countermeasure against the stroller heatstroke, it is necessary to clarify the thermal environment of infants. Infants have a low capacity to thermally adapt to their environment and so sufficient consideration must be given to their thermal environment. The purpose of this study is clarified the values of human factors such as the forced convective heat transfer coefficient for the posture of an infant in a stroller. The convective heat transfer coefficients were measured by using an infant thermal manikin. The experimental thermal environment conditions were set the air and wall surface temperatures were equalized, creating a homogeneous thermal environment. The air velocities were set the nine cases at the range of from 0.29 to 3.48 m/s. The surface temperature of each part of the infant thermal manikin was controlled to a steady 34 ℃. The heat transfer coefficient during forced convection for the posture of an infant in a stroller (hc [W/(m2·K)]) was proposed the empirical formula hc = 12.22V0.711, 0.29<V<3.48 m/s. It was clarified that infants were more susceptible to wind than adults in outdoor environments with wind speeds exceeding 1.5 m/s.
