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[EnergyPlus_Support] Simulation of a water pipe



Hello, I am trying to calculate the thermal loss of an external pipe installed in an aquatic amusement park.  
The pipe is not totally filled with water: just a small amount of water flows in it. The rest of the pipe's section is occupied by air: the water is heated and has a fixed temperature. There is no control on the air temperature in the pipe.
I need to calculate the thermal loss in order to size the heating plant and to evaluate the option of installing some sort of thermal insulation on the pipe.
Is it correct to simulate the pipe with a pipe:outdoor ? Is it possible to simulate just the small waterflow or pipes can only be totally filled with just one fluid?

Thank you!

Stefano



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