閉鎖系室内におけるオゾンの生成・分解装置の性能評価に関する研究-単一機種の試験-

The efficiency of commercially available equipments for ozonization by ultraviolet rays in the rooms was measured and assessed. The volume of the room was enlarged to 4.5m3 and to 54m3, and then, the tests were held using three types of ozonization equipments. By considering the data including the results of the tests in the small room, the formulas and the line graphs on the relationships between the room volume and the ozone concentration of the steady state, and those between the ozone concentration of the steady state and the input current of a lamp were obtained. As the result of this experiment, a new phenomenon was found out, that is, the apparent velocity of ozone photo-decomposition by an ultraviolet ray lamp having a constant initial current was slower than that of the spontaneous decompositions, when the room volume was enlarged beyond a certain degree. This phenomenon was named an inversion volume. The overall assessments of these three kinds of equipments were as follows : 1) In the case of the ozone formation those equipments are useful, because they are efficient enough to obtain the ozone concentration of the steady state within an hour, though the time consumed to achieve it varies according to its room volume. 2) In the case of the ozone decomposition in the ordinary laboratory, as far as the decomposition velocity is concerned, setting up one ultraviolet ray lamp and one ozone lamp can be less effective than those of the spontaneous decomposition. Therefore, to increase the decomposition velocity, it is necessary to increase the input current of one ultraviolet ray lamp, or to set up the lamps in parallel. 3) In the extremely clean room, such as a bioclean room, the ozone decomposition by ultraviolet ray (using 140W big type of double wall) is thought to be useful. Lastly, the efficiency assessments and the comparisons of all the equipments (including the following system) measured in the past was conducted, and therefore, the one in which the greatest improvement could be made was found.