ME405_Lecture_24

# ME405_Lecture_24 - ME 405 Fall 2006 Professor John M...

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ME 405 Fall 2006 Professor John M. Cimbala Lecture 24 11/01/2006 Today, we will : Continue our discussion of tunnel ventilation in Section 5.14 Do an example problem – tunnel ventilation If time, begin to discuss local ventilation in Section 6.1 Recall, from last time, our analysis of an automobile tunnel: U (0) U ( x ) x make-up air exhaust air dx Q m Q e tunnel element L emission source v c e dx Q L () dc cx dx dx + dU Ux d x dx + m dx Q L dx A c U ( x ) c ( x ) c ( x ) c ( x ) c m dx S L ws dx kAc L We derived an equation for conservation of mass of the contaminant (for the control volume shown): 2 cm m c c c c w s e dx dx dU dc dU dc dx dx UcA S Q c UcA c dxA U dxA dx A k A c Q c L Ld x d x d x d x L L ++ = + + + + +

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Example Given : An engineering firm is designing a balanced transverse ventilation automobile tunnel. The design criteria are provided below: (EF) c = emission factor for carbon monoxide = (5600 mg)/(auto km) U (0) = inlet air speed into tunnel = 80. m/min c m = mass concentration of make-up air = 1.0 mg/m 3 k w = wall adsorption coefficient = 0.013 cm/s

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ME405_Lecture_24 - ME 405 Fall 2006 Professor John M...

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