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Re: [TRNSYS-users] [Bldg-sim] simulation trend opposite to reality (validation)



Karol,
  The behavior that you describe is certainly contrary to gut sense. However, there are any number of reasons why the simulation might be showing you these results, ranging from user error to the equipment operating at a much less efficient operating point under lower load conditions. I would recommend that you check energy balances in your simulation and make sure that it is operating the way that you intend for it to.
Regards,
 David


On 11/12/2012 11:22, Karol Bandurski wrote:

Dear All,

 

I simulate the dwelling in TRNSYS. Last time a try to validate my model and I compare simulation results with measurements.

Heat consumption has been measured in dwelling every week (the same day of week and the same hour).

Trnsys simulation generate results for dwelling’s model with ideal heating assumptions (set temperature 20/21) –NTYPE2 (sensible energy demand).

 

Total heat consumption (measurements) of dwelling and energy demand (simulation) of simulated model are quite similar (36 weeks from September to June), but if we look on weekly results there are bigger difference with interesting regularity:

 

if heat consumption decreases from one week to the next, then energy demand increase, and vice versa (I enclose graph).

 

Could you tell me what can cause this lack of coincidence?

I will be grateful for any hints!

Regards,

Karol

 

------------------------------------------------

Karol Bandurski MSc.

Institute of Environmental Engineering

Poznan University of Technology

www.ee.put.poznan.pl

www.put.poznan.pl

 



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