[Equest-users] Parametric runs and user expressions

[David Reddy]

Hi Julien,

I am pretty sure you can't use an expression to set a global parameter; 
they are limited to being numeric or string (symbol) values.

Unless I am mistaken on what you are after, you can change the values of 
global parameters in parametric runs; see below for an example.



To my knowledge, no, you can't reset or restore defaults using 
parametric runs, but I can't say I've ever investigated this.  You can 
use expressions that are dependent on a global parameters to set a 
keyword value to unused or no_default. For example:

{if(#pa("901 HVAC Flag") ==1)
then 45
else unused
endif}

-David


On 2/24/2015 6:48 AM, Julien Marrec wrote:
> Hi,
>
> Is there a way to implement the following::
>
> - Use a user expression to set a global parameter's value?
> ex: define a parameter which refers to another one: 
> {#PA("GPM_DHW")*500*65/1000000}
>
> - Use a user expression in a parametric run component?
> Ex: I would like to set one keyword to refer to a global parameter
>
>
> - In parametric runs, reset values to be default values? Or at least 
> specify the "unused" keyword?
>
> Thanks,
> Julien
>
> Side note: this is pretty weird, but if you have a UVT with HEAT 
> SOURCE being electricity, it stills include some furnace losses, 
> exactly 800 BTU/H (on your fuel meter) which is the DOE default.
> I found this because I've got one example where I have a UVT which 
> Heat source is a furnace in my baseline, and it's actually electric in 
> my proposed model.
> In my baseline, I have defined a user default for the FURNACE-AUX to 
> be 0 BTU/H (no pilot light consumption). This 0 BTU/H value stays once 
> I change heat source to electricity, and gives me a lower gas 
> consumption that I would get if I manually restore FURNACE-AUX to be 
> DOE default (which displays "n/a")).
>
>
>
>
> --
> Julien Marrec, EBCP, BPI MFBA
> Energy&Sustainability Engineer
> T: +33 6 95 14 42 13
>
> LinkedIn (en) : www.linkedin.com/in/julienmarrec 
> <http://www.linkedin.com/in/julienmarrec>
> LinkedIn (fr) : www.linkedin.com/in/julienmarrec/fr 
> <http://www.linkedin.com/in/julienmarrec/fr>
>
>
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