Abstract
Recently, power plant's cooling towers equipped with instruments for preventing plume to visualize, which is a mechanical-draft cooling tower, tend to be planned and be constructed in Japan. Traditional ways of environmental assessment for a cooling tower has adopted a visible plume prediction model based on a natural-draft cooling tower. The requirement of developing new visible plume model having capability of prediction of visible plume, temperature, moisture and droplet from a mechanical-draft cooling tower is rising up. A field campaign to obtain data from a power plant with a mechanical-draft cooling tower for evaluation and validation of a new visible plume model and some conventional models is conducted. Measurements of surface temperature and humidity distribution around the plant does not show a clear effect of visible plume. Over 100 pairs of visible plume height and length are obtained by using video cameras and thermographyies Furthermore, droplet from the cooling tower shows very few amounts at a ground because of adopting to it a eliminator for preventing droplet scattering.
