Re: [TRNSYS-users] energy balance of air in zone

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Subject: Re: [TRNSYS-users] energy balance of air in zone

From: Marion Hiller <Hiller@Transsolar.com>

Date: Mon, 30 May 2022 10:54:58 +0000

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Thread-topic: [TRNSYS-users] energy balance of air in zone

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

Transsolar Software Team

hotline@transsolar.com

Transsolar

Stuttgart | Munich | Paris | New York

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Von: TRNSYS-users <trnsys-users-bounces@lists.onebuilding.org> Im Auftrag von karol.bandurski--- via TRNSYS-users
Gesendet: Montag, 30. Mai 2022 10:09
An: trnsys-users@lists.onebuilding.org
Cc: karol.bandurski@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