CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

heat exchanger model

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   July 23, 2008, 04:43
Default heat exchanger model
  #1
jack
Guest
 
Posts: n/a
What does exactly means the following error: NTU value not converged after 50 iterations. I am getting these message after I tried to apply the heat exchanger model data for my heat exchanger. I am using NTU model with fixed heat rejection. Thnak u for the help
  Reply With Quote

Old   July 23, 2008, 13:59
Default Re: heat exchanger model
  #2
umesh javiya
Guest
 
Posts: n/a
Internally fluent solve iteratively non-linear relation for NTU for only 50 iterations using initial guess of inlet temperature which is given in heat exchanger panel and it is not converging within this 50 iterations... you can try diferent thing like 1) guess different value of inlet temperature (increase or decrease by 50C) ... 2) ignore this error and continue ur simulations... when flow is converging then this problem may disappear, provided that you have given all data and boundary condition physically right. 3) If none of this work then give zero coolant flow rate data column. means give data for when coolant flow rate is zero. At zero coolant flow rate heat transfer rate will be zero for all value of primary flow rate. like as follow...this will definetly works... This is not a good idea cause the in simulation calculated temperature is out of the range of data input in heat exchanger panel. so try to provide as much as data possible.

coolant flow (kg/s): 0 kg/s

primary flow(kg/s): 0 0.1 0.2 0.3 0.4 0.5 (as per your data) heat transfer(w): 0 0 0 0 0 0

  Reply With Quote

Old   July 24, 2008, 08:26
Default Re: heat exchanger model
  #3
J.SURESHKUMAR
Guest
 
Posts: n/a
Respected sir,

since i am doing my final year poject in heat exchanger model using fluent software..i need some tutorials so please help for the same
  Reply With Quote

Old   July 25, 2008, 04:26
Default Re: heat exchanger model
  #4
jack
Guest
 
Posts: n/a
Hi umesh javiya. Thank you for ur answer. After trying ur advice , I actually figured out a big mistake. I forgot to divided by 2 my value of heat rejection cuz I am using a symetry. Sorry for that but thanks for tips
  Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
any question about heat exchanger model egry FLUENT 0 October 25, 2008 20:14
about the heat exchanger model egry FLUENT 0 October 12, 2008 10:31
How to model a heat exchanger? Vasilis Main CFD Forum 10 August 27, 2008 14:32
How to use Heat Exchanger model? Johnny FLUENT 0 August 9, 2004 07:44
Heat exchanger model Dotti Massimo FLUENT 0 October 19, 2000 10:20


All times are GMT -4. The time now is 05:53.