Abstract
To make a positive use of the thermal effect on the wet building surface, the steady-state thermal effect in terms of heat gain decrease was examined by simulating the roof spraying operation. The summary is as follows. 1. To estimate the hourly heat gain decrease, Wet Sol-Air Temperature, an extension of the idea so-called Sol-Air Temperature including the mass transfer mechanism on the wet building surface, is defined and calculated for various materials with the aid of meteorological data for the Tokyo area. (See Figs 2, 3 and 5) 2. Statistically analyzed, the Wet Sol-Air Temperature is highly correlated with the Sol-Air Temperature. Inferring this relation from regression lines, the Sol-Air Temperature decrease in the roof spraying operation is easily estimated and the error examined. (See Figs 4, 11 and 12) 3. Only with the regression lines and Sol-Air Temperature, the monthly heat gain in the roof spraying operation is calculated and compared with the one without the operation to show the thermal effect. (See Figs 7, 8 and 10) 4. The monthly heat gain is analyzed to find Temperature Control Index for the roof spraying operation and necessary roof spraying operation hour is accordingly determined. (See Table 6) Further the value estimated by this method is examined theoretically in comparison with the exact value. (See Figs 8 and 9) The thermal design data indispensable for the roof spraying has been obtained.
