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  1. #1
    Join Date
    Aug 2008
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    Moscow, Russia
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    Does anyone know

    Does anyone know the value of relative humidity of car exhaust gas? Just approximately. I need that for a dew point temperature calculation. I'm trying to find out the insulation thickness for a duct which goes outside of the building.
    Outdoor temperature for my district is -28 degrees Celsius (-18.4 Fahrenheit).

  2. #2
    Join Date
    Jan 2009
    Location
    Keokuk, IA
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    5,520
    Quote Originally Posted by Sweetnighter View Post
    Does anyone know the value of relative humidity of car exhaust gas? Just approximately. I need that for a dew point temperature calculation. I'm trying to find out the insulation thickness for a duct which goes outside of the building.
    Outdoor temperature for my district is -28 degrees Celsius (-18.4 Fahrenheit).
    According to a Google search, around 140F dewpoint for a typical lean burn modern engine. It will be higher for richer mixtures. If my math is right, a 2.5L naturally aspriated engine at a 900RPM idle speed is pushing around 20CFM and around 150CFM near redline.

  3. #3
    Join Date
    Aug 2008
    Location
    Moscow, Russia
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    17
    Quote Originally Posted by motoguy128 View Post
    According to a Google search, around 140F dewpoint for a typical lean burn modern engine. It will be higher for richer mixtures. If my math is right, a 2.5L naturally aspriated engine at a 900RPM idle speed is pushing around 20CFM and around 150CFM near redline.
    Better late than never. I'll rephrase my question. Does anyone know the temperature of a car exhaust gas? I quess it will be different depending on engine work duration.

  4. #4
    Join Date
    Jan 2004
    Location
    PA
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    68,766
    Made this its own thread. You are not permitted to post in other peoples threads in the AOP forums.
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  5. #5
    Join Date
    Jul 2006
    Location
    Virginia
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    4,877
    Quote Originally Posted by Sweetnighter View Post
    Better late than never. I'll rephrase my question. Does anyone know the temperature of a car exhaust gas? I quess it will be different depending on engine work duration.
    Put a thermometer in the exaust pipe and bingo you will know

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