充填塔による冷水操作
1950 年 14 巻 4 号 p. 143-147
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1950 年 14 巻 4 号 p. 143-147
Water-cooling, tests were made using a column, 254mm i.d. and packed with 25-mm ceramic Raschig rings to a depth of 320mm. The results showed that the water-film offerred considerable resistance to enthalpy transfer between water and air. The water-film coefficient hLa [kcal/m3·hr·°C] was computed With the use of the empirical equation (5) for the gasfilm coefficient k'Ga [Kcal/m3·hr·Δi] obtained by the authors from the data on the adiabatic humidification runs in the same apparatus. The correlations were
in which G and L were the mass velocities of gas and water respectively in kg per hour per square meter of gross cross section of the column.
The over-all coefficient K'Ga and (H.T.U.)OG Were also computed. The value of K'Ga ranged from 40 to 70% of that of k'Ga. It is to be noted that (H.T.U.)OG was far smaller than those For conventional grid towers.
Methods of seperating the over-all coefficient or (H.T.U.) into individual ones were suggested.
