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E10 Group Assignment4

# E10 Group Assignment4 - For the commercially available UV...

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For the commercially available UV lamp (Philips 4W, diameter 5/8’’, length 6’’, emitted UV output 0.8 W), the light intensity of the lamp is = = . ( × . × )×( × . )= . I0 P2πr0L 0 82π 58 2 54 12 6 2 54 10 52mWcm2 . We choose Poliovirus I in this analysis because Poliovirus is one of the most well- characterized viruses, whose 4-log UV dose is about 60 mWcm2 . According to the equation / =- lnN N0 ΛIt , the lethality coefficient = Λ 4/60 = 0.153. The radius of the lamp is × . × = . 58 2 54 12 0 79375cm , we test the radii of the outer case from 1cm to 25cm. Here we test such a wide range because if the radius is too small, the time that water flow through the disinfection will be too short and will not achieve 4- log disinfection. According to = - - Ir I0r0re αr r0 , we calculate the light intensity at each radius of the outer case and plot it against the radius. Using Trapezoid Rule, we estimate the average light intensity Iave for each radius. We calculated the volume of water in the disinfection unit, using the equation = - V πr2 r02L

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