Abstract
The Kata thermometer was invented as a man-thermal model by L. Hill in 1916. Nowadays, the thermometer is said to be available for measuring low air movement such as we find in an ordinary room in everyday life.
In the present study, the formula for calculating air movement is discussed and the experiments on the heat transfer coefficient of the Kata are made. As a result of the investigations and the experiments, it is proved that the existing Kata calcuating formula of air movement can not be applied to an ordinary thermal environment where the ambient air temperature is not equal to the radiant and that the value of Kata's convective heat transfer coefficient is considerably larger than that obtained from the present laboratory work in a controlled test-chamber. Further, an approach for a rational measurement of air movement by using the dry and the wet Kata thermometers at the same time is proposed. It is possible to obtain the correct value of air movement by the present method, regardless of whether the air temperature is equal to the radiant or not.
