Re: [TRNSYS-users] Control of on active layer

["Cramer Silkworth" <silkworth@transsolar.com>]

Arnaud,

All you need is an equation:

Tinflow = gt(Tzone,20) * Toutside_amb + not(gt(Tzone,20)) * 35

the GT and LT functions return either 0 or 1, so this contruction gives 
you, in effect, an in-else statement.

-Cramer 


-----Original Message-----
From: A.Thome-08@student.lboro.ac.uk 
[mailto:A.Thome-08@student.lboro.ac.uk] 
Sent: Sunday, July 12, 2009 8:34 AM
To: Cramer Silkworth
Subject: RE: [TRNSYS-users] Control of on active layer


Good afternoon,

I would like to pre-heat the inflow of the ventilation during the 
heating period to see the impact that this would have on the heating 
bill.

To do so I would like find a controller to model:
if Tzone>20°C then Tinflow=Toutside_amb
if Tzozne<20°C then Tinflow=35°C

Do you know wich controller should I use?

Thank you very much!




Quoting Cramer Silkworth <silkworth@transsolar.com>:

> Arnaud,
>
> Type 2 is a basic deadband controller with hysteresis ('memory'), set 
> a deadband of around 2K, so the heat comes on when the temp drops 
> below 20, and goes off when the space hits 22, for example. Use its 
> output to control the massflow of the active layer.
>
> There's probably an example of how to use this type in one of the 
> example files, it can be a bit confusing at first to figure out all 
> the inputs - so check out the examples and documentation.
>
> -Cramer
>
>
> -----Original Message-----
> From: A.Thome-08@student.lboro.ac.uk
> [mailto:A.Thome-08@student.lboro.ac.uk]
> Sent: Thursday, July 09, 2009 12:59 PM
> To: trnsys-users@cae.wisc.edu
> Subject: [TRNSYS-users] Control of on active layer
>
>
>
> Good afternoon,
>
> Within type 56, I created an embedded heating floor using an active 
> layer.
> But I don't manage to control it.
>
> I would like the heating floor to operate only when the temperature of 

> the room is below 20°C.
>
> Which component should I use and how should I connect it.
>
> Thank you very much.
>
> Best regards,
>
> Arnaud T.
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