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time to steam up

Posted by dullfig 
time to steam up
February 04, 2015 11:49AM
Hello all:

Ok, I know this is a back of the envelope, naive calculation, but on the other hand, I think it's a useful excercise. So here goes.

The SES boiler weighed something like 110lbs of steel. If we asume a firing rate of 750,000 lbs/hr, and a specific heat for steel of .11btu/lb/deg, that means you can heat the coils from ambient to 100 deg in 2 seconds, right?

So my question is, in a practical boiler, where is the rest of the time to first steam going? Should we be firing up on a dry coil? Would the coils melt? Could they not take the heat Flux unless full of water? I think a modern steam car would have to fire up pretty quick to be accepted.

It's kind of a "mental excercise" type of question.

Dan

P.S.: did I get my numbers right?
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