demonstration, see fig. 7. Gas is released at the emission point x = 30 m, y = 15 m and z = 2 m at a volume rate of 400 m3/h; this volume rate is required in summertime per unit of livestock (in German: GroBvieheinheit, 1 GV = 500 kg live weight) for ventilation of pighouses; Tt is an average measure. Fig. 7 shows the isopleths of the dimensionsless concentration ratio C/C at the immission level z = 3 m. The mean wind speed U is 2,6m/s. The arrows give the range of the altering wind direction; the mean wind direction is 161 degree. At the source we have C/C0 = 10\ A maximum of nondimensional concentration is found in the downwind distance of about 30 m from the point source. 60 ^ 30 15 0 15 30 £5 m 60
1986 ◽
pp. 122-122
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The Mean
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2016 ◽
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