短波長放射のある室内における空気温度測定方法に関する実験的研究

Abstract

There are two ways conceived to measure indoor air temperatures under shortwave radiant environments ; one is the positive measurement and the other is passive measurement. Possibilities and limitations of the two methods under the wind velocity range between doldrums and less than 1.0 meter per second were sought for, by varying shortwave radiant intensity. The positive measurement method used a 100-microne in-diameter thermocouple made of copper and constantan wires as sensor device, which was contained in a transparent vinyl tube of 3.8 milimeters in outer circumference. A double aluminum radiant shielding pipe (outer circumference 4.0 milimeters, thickness 0.1 milimeter) is installed on the top of the tube, where the sensor is located. This method is designed to forcefully absorb air around the sensor through the tube. Other devices were applied in order to reduce air volume to be absorbed at the time of measurement. The passive measurement method, on the other hand, used thermo-couples of 25, 50, 100 and 200 microns in diameter, where surface coating which was believed to have least radiant absorptivity was applied. This method heavily depends on excellence of the convective heat exchange due to slight air currents existing indoors.