[TRNSYS-users] using conditionals sentences in "insert new equation"

[leen peeters]

Tiago,

you can easily do it. But you need to avoid the 'then' by formulating it 
differently. Introduce a flag; flowratezero which is zero if the flow rate 
is zero and one else.
Then the calculation of Tout. Suppose that is given by an equation a*b-c, 
then the new line for that becomes:
flowratezero*(a*b-c). If the aim is to avoid the result being zero, you can 
use:
flowratezero*(a*b-c)+(1-flowratezero)*Tsafe
where Tsafe is a safety value, which for example equals Tin

Hope this helps,

Leen

----- Original Message ----- 
From: <em04143 at fe.up.pt>
To: <trnsys-users at cae.wisc.edu>
Sent: Monday, May 25, 2009 4:00 PM
Subject: [TRNSYS-users] using conditionals sentences in "insert new 
equation"



Dear Trnsys Users,

Does anyone knows if it's possible to use conditionals sentences
(ig-then-else) in the insert new equation functionality? For example,
i'm using an equation that describes the Tout of a collector, but i
don't want to calculate the Tout, if the flow rate is equal to zero.
Does anyone knows if it´s possible to do this?

Kind regards, Tiago Teixeira


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