The Spot Air-Conditioning System Using Fine Fog

Abstract

Spot air-conditioning system has been frequency adapted as a countermeasure for protecting workers from severe operations in a machinery factory during hot summer. However, the conventional system is not effective because it supplies the cold air surrounded by the hot air induced by the discharge of cooled air through a supply air opening. In this article, we proposed a new spot air-conditioning system with a nozzle, which supplies fine fog to obtain the sufficient cooling performance. The effectiveness in lowering the room temperature and the degree of comfort for workers by the introduction of new system were evaluated through the experiments with a model room. It was found that the system was effective in protecting workers from operations in the severe hot environments. In addition, CFD simulation results of spatial distribution of air flow velocity, temperature and humidity in the model room were qualitatively in good agreement with the experimental data, implying that CFD is an effective tool for predicting the cooling performance of a new spot air-conditioning system and obtaining various parameters necessary for designing the system.