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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. Originally Posted by Sweetnighter
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.

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Originally Posted by motoguy128
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. Made this its own thread. You are not permitted to post in other peoples threads in the AOP forums.

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Originally Posted by Sweetnighter
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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