An industrial source in a rural location has the following c

An industrial source in a rural location has the following characteristics: Emission rate is 20 g/s of fine particulate matter at an exit velocity of 18 m/s and an exit temperature of 318 OK The surface roughness around the plant is 0.4 m. The atmospheric stability is D and the wind speed at 10 m is 3.5 m/s. The ambient temperature is recorded at290°K. The maximum ground level concentration and the distance to the maximum concentration using SCREEN model are 2250m, 53.59g/m3 3 3250m, 63.59g/m 4250m, 73.59ug/m3 1250m, 43.59g/m2

Solution

****** AERSCREEN 16216******

ENTER TITLE FOR THIS RUN (UP TO 79 CHARACTERS):
RIDDLE

ENTER SOURCE TYPE: P FOR POINT
F FOR FLARE
A FOR AREA
V FOR VOLUME
P
ENTER EMISSION RATE (G/S):
25
ENTER STACK HEIGHT (M):
25
ENTER STACK INSIDE DIAMETER (M):
2.6
ENTER STACK GAS EXIT VELOCITY OR FLOW RATE:
OPTION 1 : EXIT VELOCITY (M/S):
DEFAULT - ENTER NUMBER ONLY
OPTION 2 : VOLUME FLOW RATE (M**3/S):
EXAMPLE \"VM=20.00\"
OPTION 3 : VOLUME FLOW RATE (ACFM):
EXAMPLE \"VF=1000.00\"
20
ENTER STACK GAS EXIT TEMPERATURE (K):
318
ENTER AMBIENT AIR TEMPERATURE (USE 293 FOR DEFAULT) (K):
290
ENTER RECEPTOR HEIGHT ABOVE GROUND (FOR FLAGPOLE RECEPTOR) (M):
000
ENTER URBAN/RURAL OPTION (U=URBAN, R=RURAL):
R
CONSIDER BUILDING DOWNWASH IN CALCS? ENTER Y OR N:
N
USE COMPLEX TERRAIN SCREEN FOR TERRAIN ABOVE STACK HEIGHT?
ENTER Y OR N:
N
USE SIMPLE TERRAIN SCREEN WITH TERRAIN ABOVE STACK BASE?
ENTER Y OR N:
Y
ENTER CHOICE OF METEOROLOGY;
1 - FULL METEOROLOGY (ALL STABILITIES & WIND SPEEDS)
2 - INPUT SINGLE STABILITY CLASS
3 - INPUT SINGLE STABILITY CLASS AND WIND SPEED
3
ENTER STABILITY CLASS, 1(=A) TO 6(=F):
4
ENTER 10-METER WIND SPEED (M/S):
3
USE AUTOMATED DISTANCE ARRAY? ENTER Y OR N:
Y
ENTER TERRAIN HEIGHT ABOVE STACK BASE (M):
000
ENTER MIN AND MAX DISTANCES TO USE (M):
100 20000

**********************************
*** SCREEN AUTOMATED DISTANCES ***
**********************************

*** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES ***

DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA
(M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH
------- ---------- ---- ----- ----- ------ ------ ------ ------ -----
100. .3554E-11 4 3.0 3.4 960.0 103.16 13.92 12.18 NO
200. .1588E-04 4 3.0 3.4 960.0 103.16 20.92 16.36 NO
300. .5817E-01 4 3.0 3.4 960.0 103.16 29.10 21.96 NO
400. 1.526 4 3.0 3.4 960.0 103.16 36.88 26.94 NO
500. 3.182 4 3.0 3.4 960.0 103.16 42.49 28.87 NO
600. 5.706 4 3.0 3.4 960.0 103.16 48.20 30.80 NO
700. 9.302 4 3.0 3.4 960.0 103.16 54.02 32.81 NO
800. 13.92 4 3.0 3.4 960.0 103.16 59.89 34.87 NO
900. 19.38 4 3.0 3.4 960.0 103.16 65.79 36.97 NO
1000. 25.39 4 3.0 3.4 960.0 103.16 71.69 39.10 NO
1100. 29.81 4 3.0 3.4 960.0 103.16 77.59 40.78 NO
1200. 34.02 4 3.0 3.4 960.0 103.16 83.48 42.44 NO
1300. 37.95 4 3.0 3.4 960.0 103.16 89.35 44.08 NO
1400. 41.54 4 3.0 3.4 960.0 103.16 95.21 45.69 NO
1500. 44.77 4 3.0 3.4 960.0 103.16 101.04 47.28 NO
1600. 47.61 4 3.0 3.4 960.0 103.16 106.85 48.84 NO
1700. 50.09 4 3.0 3.4 960.0 103.16 112.64 50.39 NO
1800. 52.22 4 3.0 3.4 960.0 103.16 118.41 51.91 NO
1900. 54.00 4 3.0 3.4 960.0 103.16 124.15 53.41 NO
2000. 55.48 4 3.0 3.4 960.0 103.16 129.88 54.90 NO
2100. 56.68 4 3.0 3.4 960.0 103.16 135.58 56.36 NO
2200. 57.62 4 3.0 3.4 960.0 103.16 141.26 57.81 NO
2300. 58.33 4 3.0 3.4 960.0 103.16 146.92 59.24 NO
2400. 58.84 4 3.0 3.4 960.0 103.16 152.56 60.66 NO
2500. 59.16 4 3.0 3.4 960.0 103.16 158.18 62.06 NO
2600. 59.33 4 3.0 3.4 960.0 103.16 163.77 63.44 NO
2700. 59.35 4 3.0 3.4 960.0 103.16 169.35 64.81 NO
2800. 59.25 4 3.0 3.4 960.0 103.16 174.92 66.17 NO
2900. 59.05 4 3.0 3.4 960.0 103.16 180.46 67.51 NO
3000. 58.75 4 3.0 3.4 960.0 103.16 185.98 68.84 NO
3500. 56.03 4 3.0 3.4 960.0 103.16 213.36 74.89 NO
4000. 52.63 4 3.0 3.4 960.0 103.16 240.35 80.65 NO
4500. 49.08 4 3.0 3.4 960.0 103.16 266.99 86.16 NO
5000. 45.62 4 3.0 3.4 960.0 103.16 293.32 91.46 NO
5500. 42.37 4 3.0 3.4 960.0 103.16 319.37 96.57 NO
6000. 39.37 4 3.0 3.4 960.0 103.16 345.16 101.52 NO
6500. 36.64 4 3.0 3.4 960.0 103.16 370.71 106.31 NO
7000. 34.15 4 3.0 3.4 960.0 103.16 396.04 110.98 NO
7500. 31.89 4 3.0 3.4 960.0 103.16 421.16 115.52 NO
8000. 29.85 4 3.0 3.4 960.0 103.16 446.09 119.95 NO
8500. 28.00 4 3.0 3.4 960.0 103.16 470.83 124.28 NO
9000. 26.31 4 3.0 3.4 960.0 103.16 495.41 128.51 NO
9500. 24.78 4 3.0 3.4 960.0 103.16 519.82 132.66 NO
10000. 23.38 4 3.0 3.4 960.0 103.16 544.07 136.72 NO
15000. 14.45 4 3.0 3.4 960.0 103.16 779.54 171.14 NO
20000. 10.04 4 3.0 3.4 960.0 103.16 1004.99 200.92 NO
ITERATING TO FIND MAXIMUM CONCENTRATION . . .

MAXIMUM 1-HR CONCENTRATION AT OR BEYOND 100. M:
2668. 59.36 4 3.0 3.4 960.0 103.16 167.51 64.36 NO

CONTINUE SIMPLE TERRAIN AUTOMATED CALCS WITH NEW TERRAIN HEIGHT?
ENTER Y OR N:

This is solution for

An industrial source is in a rural location. The surface roughness is 0.4 m around the plant. It has a 25 m stack with the top inside diameter of 2.6 m. Under normal operating capacity it emits 25 g/s of fine particulate matter at an exit velocity of 20 m/s and at an exit temperature of 318 ^oK. Calculate centerline ground level concentration for downwind distances of 100 to 500m. Calculate the maximum concentration and the distance to the maximum concentration using SCREEN model. The atmospheric stability is D and the wind speed at 10 m is 3 m/s. The ambient temperature is recorded at 290^oK.

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