Re: [TRNSYS-users] heating control in type 56

[David Bradley <bradley@tess-inc.com>]

Dear Jörn,
  You are correct in your understanding that the Type56 internal
heating and cooling mechanisms are ideal and that there should be no
demand when the zone temperature is between the heating and cooling set
point, regardless of the time step. If you are seeing such behavior, you
should address the problem to your distributor.
Kind regards,
  David 

At 01:22 AM 5/27/2005, Jörn von Grabe wrote:
> dear
> all,
>  
> the following situation occurred during a fairly simple simulation with
> only one room, an irregular ventilation rate and an ambient temperature:
> even though the room temperature was above the set temperature for the
> heating the heating was turned on (sensible energy demand negative). at
> first sight i thought this would happen because trnsys wants to avoid the
> room temperature to drop below the set temperature during the time step.
> but first of all it happens no matter how small my time steps are and
> secondly it also happens even though the temperature increases due to the
> heating (say 20° is my set temperature, 20,5° is my room temperature at
> time step i and due to further heating it increases to 21° at time step
> i+1). my question therefore is: can anyone explain to me the
> trnsys-internal controlling mechanisms for heating? isn't it supposed to
> be an ideal controller?
>  
> thanks in advance,
> jörn
>  
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> TRNSYS-users@engr.wisc.edu
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