Temperatre drop in pipeline!

[uzellac]

Dearest people i have problem probably quite easy but i can not find any information about that!Well:

i have:

-1000m carbon steel gas pipeline,
-at the inlet temperature is 47 celsious,
-the preasure is 73 bar,
-the pipeline is below graund,
-temperature of ground is 4 celsiouse,

I NEED INFORMATION WHAT IS THE TEMPERATURE ON THE END OF PIPELINE!
I can not to find that equal for the calculation!

The biggest problem is becouse pipeline is encirclement by ground and logicly the temperature around pipeline,is not constant!

THANK TO THE EVERYBODY!

MARKO

 

[PersonalProfile]

As a start:

http://en.wikipedia.org/wiki/Heat_transfer

Select a mechanism (if it varies with length, consider subdividing the length) and calculate.

Additional coefficients are available online.

Regards,
Lyle

 

[RaRo]

What I would recommend for a quick and dirty estimate:
You can propably forget external convection and radiation. Consider as a first approach an infinitely conductive pipe, an homegenous ground/soil with a constant conduction factor (between 1 and 6 W/m/K depending on type/geology).
Check what is the flow regime (turbulent, laminar...) in your pipe, and compute the heat loss/gain accordingly.

 

[uzellac]

THNK S AT ALL!