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  1. gsnitz

    Exhaust Back Pressure Calculations

    There's no EGR loop to consider. Mass transport must be constant due to conservation of mass, so the mass exiting the engine must be the mass exiting the tail pipe, although they exact conditions at any point between them may be different. The point I'm not clear on: is the mass flow rate of...
  2. gsnitz

    Exhaust Back Pressure Calculations

    DOC: Diesel Oxidation Catalyst - non-selective catalytic reduction of CO, HC, and other minor emissions species DPF: Diesel Particulate Filter - traps and oxidizes soot and other particulate matter SCR: Selective Catalyst Reduction - targeted catalytic reduction of NOx In a typical exhaust...
  3. gsnitz

    Exhaust Back Pressure Calculations

    I should have prefaced all of this with the fact that we are in the business of designing and selling after-treatment systems. We have done exhaustive testing on the DPF system by itself and we often generate non-linear curves of back-pressure vs. engine load to ensure that the DPF will not...
  4. gsnitz

    Exhaust Back Pressure Calculations

    In this application we are only dealing with 20-25"WC of back pressure for the entire system. The DPF, in a clean state, will typically consume 16"WC, and as it soot loads, increases back pressure to 22-23"WC. My concern is that if all of the other equipment's pressure losses are actually...
  5. gsnitz

    Exhaust Back Pressure Calculations

    Hello Everyone! I've been reading these forums a lot lately and they have been extremely helpful! I can already think of a few individuals who might know this topic in depth. I keep hearing at work that the back pressure in an aftertreatment system is not additive. In this particular example...

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