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## Main Question or Discussion Point

I need some help with a heat transfer issue.

I am trying to calculate if a exposed non flowing water filled pipe will freeze based on a varying temperature profile that varies from 26 deg to 45 deg in 24 hrs. This will depend on the size of the pipe but that is a variable that can be changed to determine the minimum size pipe to use.

For example if I have an ambient temp profile over 24 hrs in 1 hr increments what method would one use?

Would you need to just calculate the heat loss to get the pipe & water to 32Deg and then the heat loss to turn the water to ice? Is is just a convection problem, is there enough radiation involved to even inlcude that with the low temperature deltas?

I was thinking I would set up a spread sheet and calculate the heat loss for a finite number of steps to match the ambient temperature profile and see if the heat losses and gains result in the pipe freezing over a certain time.

Any ideas would be most helpful.

Thanks in advance,

Kris

I am trying to calculate if a exposed non flowing water filled pipe will freeze based on a varying temperature profile that varies from 26 deg to 45 deg in 24 hrs. This will depend on the size of the pipe but that is a variable that can be changed to determine the minimum size pipe to use.

For example if I have an ambient temp profile over 24 hrs in 1 hr increments what method would one use?

Would you need to just calculate the heat loss to get the pipe & water to 32Deg and then the heat loss to turn the water to ice? Is is just a convection problem, is there enough radiation involved to even inlcude that with the low temperature deltas?

I was thinking I would set up a spread sheet and calculate the heat loss for a finite number of steps to match the ambient temperature profile and see if the heat losses and gains result in the pipe freezing over a certain time.

Any ideas would be most helpful.

Thanks in advance,

Kris