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Should I Place A Heater Or Compressor First?

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#1 goggles3000


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Posted 12 October 2017 - 08:27 AM

If I plan to increase the pressure as well as temperature. Is there any difference if I put one before the other? I'm also looking for a book which goes into detail regarding the selection and placement of equipment in a plant.

#2 Art Montemayor

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Posted 12 October 2017 - 09:02 AM

I don’t know what level of engineering studies you are presently in - if you are indeed a student.  I suspect that you are in the first year - or perhaps not even there yet.  The reason I bring this point up is to try to point you in the general direction of what engineering - particularly Chemical Engineering involves and what it deals with - not only in your university studies, but also in the real practice of engineering.


It is important to accept the fact that engineering studies are taught step-wise and not at random.  The reason for this is that you “can’t start running before you learn to walk”.  Your specific question has a lot to do with what is called Unit Operations - physical changes in a process.  As you progress in your step-wise studies you go through heat transfer, fluid mechanics, thermodynamics and other related studies.  These basic studies are important for making process decisions such as equipment selection.


You don’t express yourself or write in specific and clear terms.  You should work on that ability because you fail to identify the basic characteristics of your proposed process (or processes).  For example, you don’t state that you are describing a temperature and pressure increase in a GASEOUS fluid - as opposed to a LIQUID fluid.  This is important because if you have a gas that you want to heat and compress, then the process answer is one where you apply a thermodynamic process - such as a process compressor - where the gas is mutually compressed and heated at the same time.  If you haven’t taken thermodynamics yet, this is difficult to understand for now.


In process engineering, if we need to increase gas pressure, we apply a gas compressor.  Compressing a gas normally increases its discharge temperature, so in your case that would be the selected process that resolves your needs.  Trying to understand this without the employment of thermodynamics is very difficult, so my advice is to first conquer the basic engineering courses before trying to make process decisions.  First put on your socks before your shoes; otherwise, you get blisters when you try to run with your shoes on bare feet.

#3 ElSid


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Posted 11 January 2018 - 07:27 AM

Not just chem e...
I'm an ME and many engineering disciplines overlap.
A QUICK example can be found on New York Blower EL-04 ... One of the newsletters. It shows/explains how placement of a heater impacts a fan. Adapt from there.

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