scholarly journals An Analytical Simple Formula for the Ground Level Concentration from a Point Source

Atmosphere ◽  
2011 ◽  
Vol 2 (2) ◽  
pp. 21-35 ◽  
Author(s):  
Tiziano Tirabassi ◽  
Alessandro Tiesi ◽  
Marco T. Vilhena ◽  
Bardo E.J. Bodmann ◽  
Daniela Buske
Keyword(s):  
Point Source ◽  
Simple Formula ◽  
Ground Level ◽  
Ground Level Concentration

scholarly journals A simple formula for the evaluation of value and position of ground level concentration from a point source

2018 ◽  
Vol 40 ◽  
pp. 69
Author(s):  
Tiziano Tirabassi ◽  
Daniela Buske
Keyword(s):  
Analytical Solution ◽  
Diffusion Equation ◽  
Point Source ◽  
Simple Formula ◽  
Ground Level ◽  
Approximate Expression ◽  
Simple Expression ◽  
Advection Diffusion Equation ◽  
Advection Diffusion ◽  
Ground Level Concentration

After setting realistic scenarios of the wind and diffusivity parameterizations the Ground Level Concentration is worked out by an analytical solution of the advection-diffusion equation, then an explicit approximate expression is provided for it allowing a simple expression for the position and value of the maximum.

In the special case shown here, the Gaussian plume model does not predict the location of the maximum concentration in agreement with the experiment, but it is appropriate to determine the concentration decay in downwind direction. That what happens between the point source location and the maximum location is of accademic interest only. A question for practical purpose is how we can get information about the maximum location, where from the model is realistic. From equation (3.13) we can deduct a rough approximation of the location where maximum ground-level concentration occurs. It is argued that the turbulent diffusion acts more and more on the emitted substances, when the distance from the point source increases: therefore the downwind distance dependency of the diffusion coefficients is done afterwards. If we drop this dependency, equation (3.13) leads to Xmax = 34,4 m for AK = I (curve a) and xmax = 87,7 m for AK = V (curve b), what is demonstrated in fig. 11. The interpolated ranges of measured values are lined in. Curve a overestimates the nondimensional concentration maximum, but its location seems to be correct. In the case of curve b the situation is inverted. C urve c is calculated with the data of AK = II. The decay of the nondimen­ sional concentration is predicted well behind the maximum. Curve d is produced with F - 12,1, f = 0,069, G = 0,04 and g = 1,088. The ascent of concentration is acceptable, but that is all, because there is no explana­ tion of plausibility how to alter the diffusivity parameters. Therefore it must be our aim to find a suitable correction in connection with the meteorological input data. o 0

1986 ◽  
pp. 124-124
Keyword(s):  
Point Source ◽  
Diffusion Coefficients ◽  
Input Data ◽  
Ground Level ◽  
Ground Level Concentration ◽  
Concentration Maximum ◽  
Rough Approximation ◽  
Gaussian Plume ◽  
Meteorological Input ◽  
Special Case

scholarly journals Status of Air Pollution Regulations Affecting Gas Turbines in 80 Nations

1974 ◽  
Author(s):  
R. J. Ketterer ◽  
N. R. Dibelius
Keyword(s):  
Air Pollution ◽  
Carbon Monoxide ◽  
Sulfur Dioxide ◽  
Gas Turbines ◽  
Ground Level ◽  
Oxides Of Nitrogen ◽  
Ground Level Concentration ◽  
Pollution Emissions ◽  
Air Pollution Emissions

This paper summarizes regulations from 80 countries covering air pollution emissions from gas turbines. The paper includes emission and ground level concentration standards for particulates, sulfur dioxide, oxides of nitrogen, visible emissions, and carbon monoxide.

Calculated Ground Level Concentration of Pollutants From Gas Turbine Using an Air Quality Display Model Computer Program

1974 ◽  
Author(s):  
N. R. Dibelius ◽  
George Touchton ◽  
Thomas Kane
Keyword(s):  
Air Quality ◽  
Computer Program ◽  
Gas Turbine ◽  
Meteorological Data ◽  
Ground Level ◽  
The United States ◽  
Combined Cycle ◽  
Ground Level Concentration ◽  
Model Computer ◽  
Two Machines

This paper contains the calculated ground level concentrations of air pollutants from 11 gas turbine models. These calculations were made using Charlotte, N.C. meteorological data. Four of these are simple cycle machines covering a range of size from 5050 hp to 65 MW and four are regenerative machines. Another three are combined cycle (STAG) machines, two machines having unfired and one having a fired heat recovery steam generator. The calculations were made using a slightly modified version of the United States Environmental Protection Agencies Air Quality Display Model Computer Program.

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