Study on Dropping Cold Water Type Air Conditioning of Large Space

ABSTRACT It has been developing many technologies to store the cold heat in winter as snowy latent heat till summer and to utilize them as a lot of cold resources during the summer. Under such a background, the authors proposed a dropping cold water type air conditioning system to cool large space such as atrium. In this system, cold water was dropped from the upper part of this large space, and the space can be cooled by the direct heat exchange between cold dropping water and surrounding hot air and the flow of the cold air accompanied to the dropping cold water, and the possibility of this system was discussed and clarified by the previous paper. In this paper, the authors discussed the temperature of inner air of an experimental tower of the dropping cold water. That is, the temperature of inner air is regarded as an equilibrium temperature, and we measured and arranged some thermal characteristics values of this system, and made a heat balance model with consideration of heat transfer through walls under the steady state to presume the inner air temperature and humidity. As the variation of temperatures and the flow rates of the dropping cold water affects the heat transfer characteristic of this model, the authors selected them as the parameters of the experiment in this paper, which was performed under the comparatively lower heat load.