In Part 1, it was observed by field survey in summer that the surface temperatures of various land uses were very different. In this paper, the first, the calculation method of the heat budget about 10 land uses of architectural scale (We called these land uses "10m LUN" i.e. 10m land use number) is described. "10m LUN" are (0) water surface, (1) naked ground, (2) paddy field, (3) grass, (4) shrub, (5) forest, (6) asphalt pavement, (7) Kawara roof, (8) zinc roof, (9) RC roof. Especially important factors about the heat budget are (1) earth surface albedo; p, (2) convective heat transfer coefficient; α_c, (3) mass transfer coefficient; k_q, (4) evaporative ratio; f, (5) thermal characteristics of materials-specific heat; C_p, specific weight; γ, thermal conductivity; λ. The values of these factors were assumed for annual calculation. The second, the results of the observations at the green area (Nagai Park in Osaka city) and various land uses (Tokyo area) were compared with the result of the calculation. From an analysis of the observation in Nagai Park (1974.8.5-8.8), the values of the calculated surface temperature coincided with the values of the observation, as a result of a combination of α_c and f. It was presumed that α_c : Slatyer and MacIlroy's equation and f=0.7. The result was comparatively rational. In an analysis of the observation in Tokyo area (1973.9.2-9.3), the calculation of the heat budget was done about various land uses. Although the surface temperature of the observation varied widely, but its values coincided comparatively with the values of the calculation. But the calculated surface temperature of natural earth surface (10m LUN (1)-(5)) vary widely with the assumption of the evaporative ratio f. The rational assumption about it remains to be proved.
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