| 摘要 |
PURPOSE:To improve the warming-up efficiency of the Kotatu by a method wherein the emitting surface of the underside of a face heater is formed with specified emissive substance so as to have large emissivity. CONSTITUTION:The emitting surface of the underside of the face heater 13 is formed by emissive substance comprising silica or silicate compound as main component added with no less than 10wt% of no less than one kind of substance, such as metal oxide or the like, having high spectral emissivity in the spectral emissive wave length ranges of 2.5-5 micrometers and of 8-12 micrometers so as to ensure no less than about 80% of the emissivity of said emitting surface in said spectral emissive wave length ranges and as well as to obtain the distribution of the spectral emission energy from said emitting surface no less than about 90% within the spectral emissive wave length range of no less than 2.5 micrometers. Consequently, because the emissivity of the emitting surface can be made large within the wave length range of no less than 2.5 micrometers or the range, which is easily absorbed in human body and its clothing, the emission energy from the emitting surface becomes large and yet, because its emission spectrum coincides with the absorption spectrum of human body and its clothing, the improvement of the warming-up efficiency of the Kotatu is resulted. |
