5 replies to this topic

[sajju]

hello every one

 

here i am going to design the indirect water bath heater (10kpsi, 4MMBtu/hr). just please have a look on attached document where i did some calculations for calculating no.of tubes in a coil.

 

thank you

Attached Files

•  IWBH.xlsx   15KB   2229 downloads

[Art Montemayor]

Ashrath:

 

Is your design meant for general interest, academic assignment, or for industrial fabrication and use?  Please respond and be specific as to its purpose.

 

Attached please find Rev2 of your workbook with my comments on your calculations and some industrial information on Water Bath Indirect Heaters.  Note how the Overall "U" is obtained and the specifications and dimensions of some fabricated sizes of heaters.  This information is taken from a recognized fabrication source that was very successful in pioneering and establishing the design of these type of heaters in the oil and gas fields of the USA, where a lot of the basic design information was formulated and established in the last century.

 

I hope this information helps you and other Forum members.

 

 IWBH Rev2.xlsx   1.44MB   2503 downloads

[sajju]

 

 

Dear sir

 

than you for your valuable reply. here i am attaching Rev-3 document with answers for all your question

 

Hope you can understand my difficulty.

 

thank you once again

Attached Files

•  IWBH Rev3.xlsx   1.49MB   2027 downloads

[Art Montemayor]

Ashrath:

 

Please be kind enough to answer questions.  Questions are asked for the sake of helping you and without having any response, you create a situation where you cannot be helped.

 

I specifically asked: “Where does the equation for the Heat Transfer coefficient come from?  Reference and whether it is Inside or Outside coefficient.

Why do you make it accurate down to the 4^th decimal place???  Do you really believe your calculations are THAT accurate???”

 

You state: “Because I have no information about the crude properties (process fluid).  How to get the process fluid properties when no information is available?”

 

An engineer HAS TO KNOW WHAT HE/SHE IS DESIGNING.  You must know the properties of the fluid you are dealing with.  Otherwise, you can design nothing for the fluid.  A professional engineer knows this and also knows that where the design is for a general case, then a general fluid has to be identified. or assumed  That is the way to solve the problem where you “don’t have information about the subject fluid”.

 

Are you really only a student and working on an academic assignment?  If so, I can understand why you take questions from a professional engineer as an obstacle to what you want.  Please cooperate, and if you are a student, then you should be following the guidelines in our Forums and posting your threads in the Student Forum.

 

You have already been given more than enough empirical information that few professional engineers have in their possession.  You cannot have every specific data you desire for your problem.  15,000 psig is a pressure that I have never seen in a water bath heater.  It can be done, but it will take an experienced and professional engineer to do it.

 

 

[sachin sharma]

Good evening sir

 

i am sachin sharma. i want know how you have calculated specific heat (Cp) for a gas composition at particular temp and pressure. If it is calculated through simulation software then its fine if not then how we can calculate Cp????

[thorium90]

Use the following website to find the component you need. Look under heat capacity, you should find the polynomial you require.

http://webbook.nist.gov/chemistry/