Changeset 408 for trunk


Ignore:
Timestamp:
Nov 19, 2007, 2:45:03 PM (15 years ago)
Author:
gerson bicca
Message:

a better formulation on effectiveness equation to solve convergence problems

File:
1 edited

Legend:

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  • trunk/eml/heat_exchangers/DoublePipe.mso

    r404 r408  
    14351435        case "counter":
    14361436
    1437 if Method.Cr equal 1
     1437if Method.Eft >= 1
    14381438       
    14391439        then
    14401440       
    14411441"Effectiveness in Counter Flow"
    1442         Method.Eft = Method.NTU/(1+Method.NTU);
     1442        Method.Eft = 1;
    14431443       
    14441444        else
    14451445       
    14461446"Effectiveness in Counter Flow"
    1447         Method.Eft = (1-exp(-Method.NTU*(1-Method.Cr)))/(1-Method.Cr*exp(-Method.NTU*(1-Method.Cr)));
    1448        
     1447        Method.NTU*(Method.Cr-1.00001) = ln(abs((Method.Eft-1.00001))) - ln(abs((Method.Cr*Method.Eft-1.00001)));
    14491448end
    14501449
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