5 replies to this topic

[Malav]

Hello everyone,

 

I have a simple heat exchanger model in Unisim where I am heating propylene with super heated steam.

Now I want to simulate what will happen if the flow rate of both fluids are same and the steam temperature is higher. I assume that it should be possible by having the 'UA' specification same as the previous design but in this case, I am getting the steam outlet temperature lower than the previous case. How is it possible?

 

[T_bag]

Please share a result Screenshot for both cases.

[Malav]

Hi, please find attached the screenshot you asked...

 

Attached Thumbnails

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Edited by Malav, 27 September 2023 - 04:14 AM.

[breizh]

Hi,

Consider this link:

https://www.linkedin...rated-mukherjee

Note: I don't know how this is taking into account in your simulator, you may ask Unisim support (helpdesk).

You may have someone able to simulate this with another simulator (Aspen for example).

Better to use saturated steam, more efficient.

my 2 cents

Breizh

[T_bag]

why your total duty is changing when your tube side material is having having same flowrate and delta T. The MCPDT should give the same result in both cases. For same duty you should be getting a higher temperature in 2nd case.

[Pilesar]

Two mixed phase pure component streams with the same temperature and pressure can have different enthalpies. Examine the phases and enthalpies of your propylene streams. Also the heat transfer characteristics of superheated and saturated steam are different so the assumption of constant UA is invalid.