Abstract
A Study of the measuring method and error of coefficient of heat transfer by convection for the interior walls have been studied using the appratus for measuring the air temperature near the surface of a wall. Quantity of heat flow by covection are assessed from multipling the air temperature gradient at the surface by thermal conductivity of air. The apparatus is therefore designed so that the air temperature of the thermal boundary layer is measured by a 0.05 mm diameter, CA thermocouple mounted, to move near or away from the surface and holding it at any predetermined distance. The following can be deduced from experimental results ; 1. It has been made known that ; 1) wall surface proximity air temperature is relatively stable within 1 mm the wall surface, and 2) air temperature distribution becomes linear up to 2.5 mm from the wall surface. 2. Taking care of the difference between a surface to be measured and a thermocouple, this method can be well used to the measurement of surface tmperature in the measurement of heat transfer coefficient. 3. This method enables the measurement of heat transfer coefficient in a short time (approx. in 8 min.) in order to induce the surface temperature from the wall surface-proximity air temperature substantially without disturbing the surface condition.
