Re: [TRNSYS-users] initial iterations for the first hour on simulation ?

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

Ayman,
  All TRNSYS types have initial values. The initial values are set by the user and as the driving forces of the system begin to change (ambient temperature, solar radiation, occupancy, etc) start to change then TRNSYS beings to iterate. In high-mass models (such as buildings and thermal storage tanks) the initial values have an important impact on their behavior as the simulation starts going. Iterating more in the first hour isn't going to change anything; the models still start out with those initial values and none of the driving forces have changed yet. If you are concerned about the impact of initial values then the best approach may be to run your simulation for two simulation years and only take the results from the second year.
Best,
 David


On 8/3/2011 13:02, Ayman Sarwa wrote:

Hi All

I am simulating a Zone with Trnsys & TrnBuild to get the Floating Temperature (i.e there is no  heating or cooling ) , I note that the initial value of temperature entered into TrnBuild for this zone has big influences on the first few hours of simulation. I use Trnsys 17.

my question is that, Is there method to make Trnsys simulates or makes initial iterations for the first hour on simulation and then complete the dynamic simulation?   

thanks in advance 

-- 
Regards
Ayman Mohamed

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