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Old Nov 10th 2016, 10:40 PM   #1
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Resulting temperature of outdoor pipe with water flow

Hi,

I am new to the topic of Thermodynamics. Currently developing a agriculture watering system where a PVC pipe of 20 feet and 4 inch diameter will be carrying water of 26 degree Celsius. The peak temperature of pipe gets at 44 degrees Celsius (is exposed to Sun).

The water is flowing continuously in the pipe at an angle of 3 degrees and water flow rate of 10 litres per hour and at steady temperature of 26 degree Celsius. Please consider the water flow is very little and forms a 10 mm line in the center of the pipe when flowing.

Can someone help me in calculating the resulting temperature of the pipe, considering it is exposed to Sun (Ambient temperature at ~40 degrees)?

Appreciate your help.
Carlen

Last edited by Carlen; Nov 10th 2016 at 10:43 PM.
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Old Nov 11th 2016, 05:38 AM   #2
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The only way to answer this is to do a computer model of the heat transfer due to ambient air temp plus solar load to PVC to water. PVC plastic is a pretty good thermal insulator, so I would expect that the pipe will not be at a single temperature but instead will have a temperature distribution that varies throughout its cross-section and along its length. The water will keep the inside portion of the pipe that is exposed to the water at close to the water temp. The rest of the pipe will be close to ambient air temperature, except for the portion that is exposed to the sun - that portion will get much warmer. You are assuming that the water is constant temp, but I bet it would actually warm up a bit as it flows. But again, this is not a simple system to model so would recommend trying a computer simulation.
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Old Nov 14th 2016, 10:43 PM   #3
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Thank you

Thank you for your kind attention and guidance. Will try a simulation model to simulate my system. Please suggest if you know of any simulation which might be available for free for my kind of system simulation.
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