Abstract
This paper describes the method of determining the surface sensation of warmth and cool caused by touching the building materials. A test apparatus was developed in order to obtain the physical quantity which correspond to the psychological quantity of sensation. The rate of change in temperature (θ_V) of copper cylinder (16mm in diameter, 25mm in high) that is the physical quantity was measured by this apparatus with many kinds of material. The sensation of warmth and cool that is changed by temperature condition in the room, kinds of material, thickness of material and crvering in paint or cloth can approximately represent by θ_V as follows. The sensation is discriminated warmth and cool at θ_V=-0.025℃/s. In the sensation of warmth, it feels a little warm at θ_V=0℃/s, pretty warm at θ_V=0.075℃/s and the sensation of warmth is saturated at more than θ_V=0.1℃/s. In the sensation of cool, it feels a little cool at θ_V=-0.054℃/s, pretty cool at θ_V=-0.135℃/s and the sensation of cool is saturated at more less θ_V=-0.2℃/s.
