2 replies to this topic

[seagal6]

Hello everyone,

 

I'm trying to calculate the following:

 

a- Saturated steam flow required to heat a liquid inside a reactor (steam flows through half pipe)

b- Time required to heat up the liquid to a certain temperature

 

For a) I'm using the example provided by Spirax Sarco (https://www.spiraxsa...ets#article-top)

 

 

As for b, I'm using an equation from the following page (https://www.thermope...de/content/547/)

 

 

Let's assume I know U and A,

 

My question is the following. How are steam flow and time required related? I don't immediately see how raising or lowering the steam flow would affect the time it takes to heat up the vessel. My only guess is that changing the flow affects the velocity which in turns affect U and every other term related to that,

 

Thanks in advance,

[latexman]

Do you have Kern’s Process Heat Transfer? His book shows the derivation of several equations for the solution of unsteady-state heat transfer differential equations. IIRC, your problem is documented.

[breizh]

Hi,

I was ready to answer your question the way Latexman did. Another reference is Perry's chemical engineers' handbook.

The last option I'm aware is the search engine in this forum.

Breizh

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