﻿ Calculation of Puff dispersion equation

# Calculation of Puff dispersion equation

 1 Downwind distance：x direction m - 2 Downwind distance：y direction m - 3 Downwind distance：z direction(Height) m - 4 Volume of emit gas：Q N・m^3/s - 5 Coefficient α：m/s,γ：m/s See below Remarks 6 Effective chimney height：He m - 7 Graph x-axis：x(m),y-axis：C(x,y,z) x-axis：z(m),y-axis：C(x,y,z) Plot Input Data： YesNo , Figure： OnOff
:Export Graph Image.

## Keyword

Puff dispersion equation,calm condition,Downwind distance,Volume of emit gas,Wind speed,Effective chimney height,Stability categories

## Reference

[1]：公害研究対策センター：『窒素酸化物総量規制マニュアル』,pp.152
[2]：社団法人土木学会：『環境工学公式・モデル・数値集』,pp.253

## Remarks

・Concentration of emissions：C(x,y,z)
・Downwind distance(m)：x,y,z
・Applicable under calm condition(the wind speed is less than 0.4m/s).
・Coefficient
 Stability α γ Pasquill Shir A -3 0.948 1.569 A～B -3～-2 0.859 0.862 B -2 0.781 0.474 B～C -2～-1 0.702 0.314 C -1 0.635 0.208 C～D -1～0 0.542 0.153 D 0 0.470 0.113 E 1 0.439 0.067 F 2 0.439 0.048 G 3 0.439 0.029