Re: [TRNSYS-users] HOW TO AVOID DIVISION BY ZERO?

["Matt Duffy" <duffy@tess-inc.com>]

Dear Ricardo,

Yes, you do indeed have to get creative with the denominator in the
equation. I sometimes use the following to prevent that.

fraction=max(m_dot_OfficeCoil,0)/max(m_toCoilsNow,0.00001)

This example supplies the fraction to a diverter outlet.




Best regards,

Matt Duffy
Technical Support Team
Thermal Energy System Specialists
22 N Carroll, Suite 300
Madison, WI  53703
608.274.2577
duffy@tess-inc.com

----- Original Message -----
From: "Ricardo Gallegos" <ricardogallegoso@gmail.com>
Sent: Fri, March 6, 2009 13:04
Subject:[TRNSYS-users] HOW TO AVOID DIVISION BY ZERO?

Hi you all,

I know this is a very simple question, but I amm stuck on it , pleqase help.

I try to calculate the efficiency of a collector field simply by dividing
useful gain by the total irradiance on the collector's plane, but obviously
this should be made only when the denominator i snot zero. I tried some
logical operations in an equation but cannot get it.

Any help will be more tha welcome

Ricardo Gallegos

Universidad Autonoma de Baja California


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----- End of original message -----