| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1987: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1986: ¥1,600,000 (Direct Cost: ¥1,600,000)
|
|---|
| Research 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 convection are assessed from multipling the air temperature gradient at the surfce by thermal conductivity of air.Values of the coefficient of heat transfer by convection for a wall are obtained by dividing the convection heat leaving the wall surface per square meter per hour by the temperature difference between the surface and the air 10cm away from the surface. The apparatus is therefore designed so that the air temperature of the thermal boundary layer is measured by a 0.05mm diameter,CA thermocouple mounted,to move near or away from the surface and holding it at any predetermined distance.(e.g.0.25,0.5,1,2,3,4mm from surface) The following can be deduced from experimental results;
1.Comparing with the other methods this method takes a shorter time and dose not disturb the surface condition.
2.The maxmum and minimum value of the local heat transfer coefficient by convection for a wall is found at the distances approximately 50cm and 25cm consecutivity from the floor.
3 Comparing the convection heat transfer coefficient along the wall at the center,with heat transfer coefficient at the corner of the wall,the value obtained at the corner is smaller than the value at the center.
|
