<efk36@humboldt.edu> wrote in message news:0e05fa1d-ec2a-4d88-be5a-6415ba8b919a@googlegroups.com...
I am simulating the heat transfer for an underground warehouse using 3 different target temperatures. I am using the HETVAL subroutine to account
for the internal heat generation for each target temperature. It works just fine for temperatures above 0 degrees Celsius. However, for negative temperatures I receive a convergence error. The error is: "FIXED TIME
INCREMENT IS TOO LARGE", "NOTE: THE SOLUTION APPEARS TO BE DIVERGING. CONVERGENCE IS JUDGED UNLIKELY".

I would like to simulate the heat flux for a target temperature of -25
degrees Celsius; however HETVAL does not seem to work for the cooling down
of the warehouse.

Any suggestions on how to overcome this problem? Any ideas would be greatly appreciated.

Thanks!
///

From Google:

"User subroutine HETVAL allows you to define a heat flux due to internal
heat generation for heat transfer, ... " I didn't even bother to expand.
HETVAL is for internal heat generation not cooling. To solve the problem
you need another subroutine or another program. When in doubt, read the
manual.



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