5 replies to this topic

[Shamsey]

Hello, I am being assigned to design a spiral baffled jacketed heat exchanger for a agitator equipped storage tank (dimensions attached). The agitator rotates at 890 rpm during preparation of a chemical solution and for the rest of the time it rotates at 534 rpm. Its motor is of 7.5 kilowatts. I want to provide my jacket with chilled water which is available at 7 Celsius, 2.5 kgf/sq.cm and I am allowed to only heat it up so that it returns at 15 Celsius. I have done the preliminary heat balance calculations, the required flow-rate to extract the heat of the process fluid amounts to 2.3 cubic meter/hour. I have also calculated the pressure drop through the chilled water supply line using API-14E. I am now stuck at sizing the jacket, the number of baffles that shall be required and the pressure drop through the jacket. Also the jacket is to cover the bottom cone and 1400mm cylinder height (refer to the drawing attached). I need guidance. Thank you. Best Regards.

[Art Montemayor]

Shamsey:

 

Our members can't "guide" you through what you have done and what you should do if you don't furnish your work and calculations.

 

They don't know what you have done or are doing without seeing your work and checking it - as is done in all world-wide engineering projects and calculations.  That is standard engineering practice.

 

If you attach your calculations and procedures in a typical engineering electronic spreadsheet you can allow our members to check your method and calculations, as well as add their suggestions and recommendations.  This is all to your advantage and profit.  If you furnish your spreadsheets, don't lock them with a password; this makes it difficult for our members to check, review, and correct any mistakes or omissions.

[Shamsey]

Art Montemayor:

 

Thank you for your response and the guidelines. I am attaching my working sheets for the ease of members.

 

For clarification, I am in the preliminary phase of calculations. I need guidelines regarding how to size jacketed heat exchanger and what are the criteria for baffle size selection. Plus the pressure drop the jacket imparts.

 

 

Thank you and Best Regards.

Attached Thumbnails

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Attached Files

•  Chilled Water Line Sizing.xlsx   20.01KB   431 downloads
•  Jacketed HEX calculation.xlsx   19.16KB   439 downloads

[nmp08]

HELLO! I am designing a jacket with spiral baffles for a screw compressor. Can anyone help me to find empirical correlations for this case as the shape is non circular.
Thank you!

[graphicsone]

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[srfish]

Shamsey,

 

Here are several literature sources on jacket vessels with agitation:

    Process Heat Transfer by Kern

    Process Heat Transfer by Hewitt, Shires and Bott.

        This has a chapter on Heat Transfer in Agitated Vessels