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Re: [TRNSYS-users] Error: division by zero

Hsein Moussawi -

The problem with your formulation is that the entire equation is still calculated even if m_H2 = 0, so you are still getting the divide by zero.  To prevent the divide by zero the formulation would be:

Eff_energy = (P_load+Q_heating+Q_DHW+Q_cooling)/(MAX(0.000001,m_H2)*LHV)

Regards,

Tim

 

---
Timothy P. McDowell
Executive Vice President
Thermal Energy System Specialists, LLC
22 N Carroll St, Suite 370
Madison, WI 53703
608-274-2577

On 2016-05-04 06:42, Hsein Moussawi wrote:

Hello there,

I am trying to compute certain equation, but I am constantly getting the following error:

 

 

[ TRNSYS Message 5 : The TRNSYS Program attempted to evaluate an EQUATION that has a division by zero. Please check the EQUATION formulation and re-run    the simulation
   Reported information  : EFF_ENERGY ]
 
I made sure to calculate the equation only when the denominator is positive as follows:
 
[ Eff_energy = GT(m_H2,0)*(P_load+Q_heating+Q_DHW+Q_cooling)/(m_H2*LHV) ]
 
Any help would be appreciated...
Regards.

 


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