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davejc

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- TL;DR Summary
- Trying to calculate cooling time for a load of steel tubes from 1100ºF using ambient temperature Nitrogen Gas.

I am working on a new application and am trying to figure out how I can calculate the cooling rate of Steel.

I have a load of Steel Tubes. 1200lb total mass. Tubes have some variance on size depending on what is being run on a given day, but nominally, we are looking at 1" OD x .1875" Wall x 17" Long Steel Tube.

Max Temp of the Load is 1100ºF.

What I am trying to come up with a calculation for is how long it will take for that load to cool to <500ºF while flowing 150 SCFH of ambient temperature nitrogen gas. I cannot just open the door and blow ambient air as it will cause the parts to oxidize.I'm certain this is not as easy as just calculating heat loss based on radiation and I'm also certain that I haven't given enough information. We typically only deal with the heatup portion of these projects, but working with a new customer who wants to calculate cooling time.

Thank you

- Dave

I have a load of Steel Tubes. 1200lb total mass. Tubes have some variance on size depending on what is being run on a given day, but nominally, we are looking at 1" OD x .1875" Wall x 17" Long Steel Tube.

Max Temp of the Load is 1100ºF.

What I am trying to come up with a calculation for is how long it will take for that load to cool to <500ºF while flowing 150 SCFH of ambient temperature nitrogen gas. I cannot just open the door and blow ambient air as it will cause the parts to oxidize.I'm certain this is not as easy as just calculating heat loss based on radiation and I'm also certain that I haven't given enough information. We typically only deal with the heatup portion of these projects, but working with a new customer who wants to calculate cooling time.

Thank you

- Dave