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Re: [TRNSYS-users] convergence problems because of high ventilation heat flux



Dear Karol

As you said, you have to change the time step to smaller values and see if the problem is resolved or not as the first option.

Arian 

Sent from Yahoo Mail for iPhone

On Tuesday, August 16, 2022, 5:51 PM, karol.bandurski--- via TRNSYS-users <trnsys-users@lists.onebuilding.org> wrote:

Dear Experts.

 

We get convergence problem in Type 56. According to our investigation source of error is sudden increase of ventilation flow in our schedule and ventilation air temperature about 3 K lower then room air temperature.

We would like to keep this control schedule and the same time avoid convergence problem.

 

So far we have increase indoor air heat capacity in zones (five times), it help a bit.

 

Do you  have any other ideas what we could do?

Should we change something in Control Cards?

 

Best,

Karol

 

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

Karol BANDURSKI Ph.D, Assistant Professor   

Faculty of Environmental and Energy Engineering

Division of Heating, Air Conditioning and Air Protection

Poznan University of Technology

https://www.researchgate.net/profile/Karol_Bandurski

***

dr inż. Karol BANDURSKI, Adiunkt

Wydział Inżynierii Środowiska i Energetyki

Zakład Ogrzewnictwa, Klimatyzacji i Ochrony Powietrza

Politechnika Poznańska

 

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