Abstract
According to the unsteady-state calculation method of room temperature and heat extraction in the multi-room building, whose roof surface is wet by roof spraying, which was described in the report Part 1 of this study, simulation has been made in a model house roof sprayed in Tokyo and the thermal effect of roof spraying is examined, compared with the one without roof spraying. As the result of the simulation, with the use of thermal cooling storage of building structure by roof spraying, thermal environment of the room is clearly improved and natural cooling hours are lengthened. Also in the air-conditioned room, related to decrease of transmission heat gain from the roof, rate of heat extraction is lowered and cooling operation hours shortened. Further effectiveness of the simplified calculation method, which includes approximate linearization of heat transfer related to mass transfer phenomenon from the roof surface in roof spraying operation, is proved by analyzing accuracy of the result and CPU time required in the calculation of room temperature and heat extraction. Estimating the result obtained from the simplified calculation method based on calculation time interval of 1 hour in Tokyo, which approximates the curve of enthalpy of saturated air by fold line, it is clear that the fold line by every 5 degree C enables to maintain accuracy required in the calculation of room temperature and heat extraction.
