市街化空間の熱的環境に関する研究 : その 3. 自然風中における熱拡散実験

概要

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A heat product device as an urban model which was 3m×3m and was controlled by electrical heater from 2 to 5kw/m^2, was placed in natural wind field to investigate the temperature distributions using 76 thermocouples above the model. Wind profiles and eddy diffusivities were also observed. Summary of results obtained may be as follows. 1. H_m which is the quantity of heat in a certain volume of air above the model and indicates the intensity of the temperature distribution, is proportional to the surface temperature on the model when wind velocity is fixed, and inverse proportional to wind velocity. 2. Observed eddy diffusivities in horizontal direction (D_m) and in vertical direction (D_z) are expressed as, D_m∝V_m・z D_z∝V_m・z^n wher z is height from ground surface, V_m is wind velocity and n is a parameter which is 1.0 when V_m is larger than 1.2m/s and decreases with decrease of wind velocity when V_m is smaller than 1.2m/s. 3. Measured temperature was compared with calculated temperature by a numerical method using the relations above as conditions. Calculated results were well in agreement with experiment results in comparisons of these isotherms, where the correlation coefficients between these results were from 0.88 to 0.98.
社団法人日本建築学会の論文
1978-03-30