温度差・温度式バイメタル乾湿計
1976 年 45 巻 3 号 p. 207-213
詳細
1976 年 45 巻 3 号 p. 207-213
A bimetallic psychrometer of temperature-difference and temperature type is composed of a compound bimetallic differential thermometer and a bimetallic thermometer. The compound bimetallic differential thermometer is constructed from two helical coils of bimetal connected in series, of which the senses of thermal deflection are mutually opposite and the angular def-lections for the same temperature change are equal. The helical coils of the bimetal used are 4 mm in diameter and 40mm long, and are connected to the ends of a plastic rod 50mm long.
A suitably adjusted compound bimetallic differential thermometer gives accurate temperature differences.
One of the helical coils of the bimetal serves as the wet thermometer and the other serves as the dry thermometer.
It is found experimentally that the necessary minimum air velocity for the bimetallic psychrometer is about 0.7m/s.
Experimental data show that the Sprung's psychrometric formula holds well for the bimetallic psychrometer.
