[TRNSYS-users] energy balance of air in zone

[Marion Hiller]

Dear Karol,

I assume there is a misunderstanding of NTYPE 8 (DQAIR) (see 05-MultizoneBuilding.pdf)
NType 8 is the sensible change in internal energy of air in airnode since the beginning of the simulation.

Therefore, instead of using NType8(at time = current timestep) you need to use the following term:
   NType8(at time = current timestep) - NType8(at time = previous timestep).

If you look at your xls SUM is always "equal" to - (dtC_dtau ) of the previous line.

Best,

Marion

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Von: TRNSYS-users <trnsys-users-bounces at lists.onebuilding.org> Im Auftrag von karol.bandurski--- via TRNSYS-users
Gesendet: Montag, 30. Mai 2022 10:09
An: trnsys-users at lists.onebuilding.org
Cc: karol.bandurski at put.poznan.pl
Betreff: [TRNSYS-users] energy balance of air in zone

Dear All,
I have generated thermal balance of air in zone, I use for it:

  *   QCSURF, NTYPE3 (convection from surfaces),
  *   QGCONV, NTYPE 7 (convection internal heat gains),
  *   QINF, NTYPE 4 (infiltration),
  *   QVENT+QCOUP, NTYPE5+ NTYPE6 (ventilation form system and other rooms),
  *   -QSENS-QRHEAT, - NTYPE2- NTYPE 78 or QHEAT-QCOOL-QRHEAT, NTYPE30- NTYPE31- NTYPE78 (heating and cooling system without radiation part),
  *   DQAIR, NTYPE 8 (change of air internal energy).

But the balance is not equal zero (enclosed).

I would be grateful for any tips.

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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