[TRNSYS-users] What is the TOLERANCE meaning?

David Bradley bradley at tess-inc.com
Mon Feb 28 07:15:20 PST 2005


   The TOLERANCES statement is a control statement used to specify the 
error tolerances to be used during a TRNSYS simulation. The statement has 
the form:



eD      is a relative (and zD is an absolute) error tolerance controlling 
the integration error.
eA      is a relative (and zA is an absolute) error tolerance controlling 
the convergence of input and output variables.

Example:        The error tolerances eD and eA are both to be set to 
one-tenth of one percent.  The TOLERANCES statement is then

TOLERANCES  .001  .001

The tolerances for the new equation solver (SOLVER=1) are considered 
differently.  The mean standard deviation for all of the equations is 
calculated and must be less than the specified tolerances to reach convergence.

At 09:37 PM 2/27/2005, Logan Wong wrote:
>Dear All,
>I would like to know the definition of the "Tolerance Convergence" in 
>Global Infos. Because I loss the TRNSYS manual (Volume I). Is it a 
>percentage no?
>When I changed this value from 0.001(define) to 0.4, my data output has a 
>lot of difference.
>²á¤Ñ«Ç¡B¦¬­µ¾÷¡BGames µ¥¦h¶µ¥\¯à
>¥þ·s Yahoo! Messenger
>TRNSYS-users mailing list
>TRNSYS-users at engr.wisc.edu

Thermal Energy System Specialists (TESS), LLC
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