By Zhonglin Xu
Fundamentals of Air cleansing expertise and Its software in Cleanrooms units up the theoretical framework for cleanrooms. New rules and techniques are awarded, which come with the attribute index of cleanrooms, uniform and non-uniform distribution features, the minimal sampling quantity, a brand new idea of outside air-con and the basics of leakage-preventing layers. Written via an writer who can glance again on significant clinical achievements and 50 years of expertise during this box, this booklet deals a concise and obtainable advent to the basics of air cleansing expertise and its program. The paintings is meant for researchers, university lecturers, graduates, designers, technicians and company R&D group of workers within the box of HVAC and air cleansing technology.
Zhonglin Xu is a senior learn fellow at China Academy of creating Research.
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The more the linear proportionality on the lognormal probability graph is, the less difference between them it becomes. 3 Relationship Between Particle Size Distributions The abovementioned particle size distribution represents the particle number distribution corresponding to the particle size. 6 Statistic Parameter of Particle Number 43 size, it represents the percentage of particle mass corresponding to certain particle size in the whole mass. For particle area distribution on particle size, it represents the percentage of particle area corresponding to certain particle size in the whole area.
When the frequency density is used, which is the proportionality of 16 Fig. 7 Frequency distribution histogram Fig. 3 Statistical Distribution of Particle Size 17 Fig. 027 0 particle number per unit size range, we could obtain the histogram as shown in Fig. 11. It is obvious that it is difficult to get any smooth curve for the former case. Even if the dashed line was drawn, it is quite different from the dashed line in the latter. 10) 18 1 Particle and Size Distribution Fig. 10 Frequency diagram Fig.
Atmospheric dust can also be divided according to the special and the generalized meanings. , the real dust, which is the special meaning of the atmospheric dust. Later someone such as Junge from Germany put forward the concept that the atmospheric dust is the aerosol with coarse diameter . But this concept is not complete , because aerosol with high degree of dispersion can be generated using artificial method or natural method occurred in atmosphere. Therefore, the modern concept of atmospheric dust refers to not only the solid dust, but also the polydisperse aerosol containing both solid and liquid particles, which is the generalized concept of atmospheric dust.