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

[David BRADLEY]

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 <http://www.ee.put.poznan.pl/>
>
> Poznan University of Technology
>
> www.ee.put.poznan.pl <http://www.ee.put.poznan.pl/>
>
> www.put.poznan.pl <http://www.put.poznan.pl/>
>
>
>
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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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