仕上材の感触に関する研究 : その 1 温冷感触

Abstract

This paper describes about the method to determine the quantity of the surface sensation of warmth and cool caused by touching the building materials. A few experiments were performed to define the relationship between the psychological quantity of warmth and cool and the physical quantity as the functions of metal feeling. The psychological quantity of warmth and cool was appraised by means of sematic differential with using fifteen materials in the room at the following temperature (10, 20, 36, 40 and 50℃) by twenty subjects. The physical quantity was evaluated as the temperature changes on the palm of a hand caused by touching the building materials in the room (10, 20 and 40℃). Results and Discussion In the room at 10℃ or 20℃, the greater the thermal diffusivity of the materials was, the cooler they felt. On the contrary, in the room at 40℃ or 50℃, the greater their thermal diffusivity was, the warmer they felt. In the room at 36℃, they felt a little warm by touching any of them, because the temperature of the hand was equal to one of the material and the radiation of body heat was prevented by the material. The rate (θ_<hv>) of change in temperature of the hand caused by touching the material was in proportion to the difference in temperature of the hand (θ_h) and the temperature of the non-touched material (θ_m), although a certain difference came out among individuals. The empirical equation is as follows. θ_<hv>=α・θ only for -15℃≦θ≦+4℃ …(1) where θ_hv : The rate of change in temperature of hard (℃/sec) θ=θ_m-θ_h (℃) θ_m : Temperature of the non-touched material (℃) θ_h : Temperature of hand befor touching (℃) α : Constant factor α is constant which depende on the materials. Many materials are α>0, but the materials of very small thermal diffusivity are α<0. θ_<hv> felt very cool was more than -0.11℃/sec at 10℃ room temperature, and was more than -0.08℃/sec in the room at 20℃. θ_<hv> neither felt warm nor cool was -0.04〜-0.09℃/sec in the room at 20℃. From the above discussion, we could conclud that the surface sensivility of warmth and cool be showed by equation (1).