[TRNSYS-users] Equation and Type 20

[David BRADLEY]

Tobias,
   The maximum heating rate is a parameter in Type60. Parameters, by 
definition, are read once at the beginning of the simulation and then 
are not updated. They are time independent. If you need a tank model in 
which the input heating rate is variable, I would recommend using 
Type534 in the TESS Storage Tank library.

   The Type20 data files are described (although not very completely) in 
the 05-MathematicalReference manual. I assume that you are using 
Trnsys16; please be aware that Type20 was removed from Trnsys17 because 
it models a very specific (rather unusual) kind of heat pump that can 
use either water or air on its source side, because it can only operate 
in heating mode, and because it has some built-in control algorithms 
that cannot be modified. A preferable heat pump model may be found in 
the TESS HVAC library.
Best,
  David


On 6/17/2013 03:53, Tobias Tag wrote:
> Dear TRNSYS-User,
>
> i have two problems with TRNSYS 17.
>
> 1. I´m trying to make the maximum heating rate of an element (of Type 
> 60c)  depending on the power produced by PV in three steps. Shold look 
> like that:
>
>
>     If 1.5kW < PV-Power < 3kW  then heating rate = 1.5 kW
>
>     else if 3kW < PV-Power < 4.5kW then heating rate = 3kW
>
>     else if PV-Power > 4.5kW then heating rate = 4.5kW
>
>
> I´ve set the heating rate as a String variable which shold get the 
> value from a equation. but i don´t know how to update the equation in 
> every time step of the simulation.
>
> 2. Does anybody know what the external files of type 20 (dual source 
> heat pump) are? Unfortunatly ther is no example in the TRNSYS-Examples 
> folder.
>
>
> Kind regards
>
> Tobias
>
>
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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