AN EXPERIMENTAL STUDY ON THE FEASIBILITY OF "SAIREI" -A WAY OF RADIATIVE COOLING- IN NATURALLY VENTILATED ROOM SPACE

This paper describes the possibility of radiative cooling with natural ventilation. We investigated the thermal encironments of two experimental small wooden buildings from the viewpoint of "exergy" together with subjective responses. One of the experimental buildings has a radiative cooling system on the ceiling and the other has a convective cooling system. In the room with radiative cooling, we set three patterns of cooling and ventilation. The ceiling surface temperature of the radiative cooling was set up to be much higher than the conventional radiative coolign panels, aiming at the realization of low-exergy cooling systems. We found that the cool radiant exergy emitted from the interior wall surfaces reached 413mW/m^2 and the maximum wet exergy contained by room air 62J/m^3 in the type of radiative cooling without natural ventilation, while on the other hand, those were in the type of radiative cooling with natural ventilation 10〜90mW/m^2 and 8 J/m^3 respectively. The number of the subjective votes for "comfort" in the type of radiative cooling with natural ventilation was larger than that in the type of radiative cooling without natural ventilation. It suggests that high-temperature radiative cooling systems can be realized provided that the indoor moisture is extracted by natural ventilation.