Condensation rate of the air inside an exhaust FRP duct

[mory2005]

Hi,


I have to find the condensation rate that occurs
in some Exhaust ducts. these are odor ducts that carry odorous air from some basins (sewer basins) and take it
to scrubber complexes. The assumptions are as follows:

point1
Inlet condition:

Tdb= 80 F
RH= 80%

point2:
outlet condition: (located at low points)
tdb = 65 F (it is assumed that T(DB) of air equals to
the ground temperature)
outlet duct is underground pipe.

RH= %100

amount of air to be exhausted = 5000 CFM

My approach is using a psychrometric chart to
calculate amount of water from point 1 to point 2.
I am going to develop an excel sheet to
calculate amount of water per month
considering temerature profile for month July.


Has anybody can help me with their suggestions?
Is there any other way that you might suggest?

Thank You


Mory2005

 

[quark]

Your procedure is correct. However, considering fluid temperature equal to that of soil temperature may be an overkill. ASHRAE 2003 Handbook contains formulae to predict heat transfer rates for undergroung piping.

Regards,