Dear All
My question refer to IES VE.
Do you know some description how couple Atrium MacroFlow calculation, based
on temperature stratification with flow forced by fans defined in
ApacheHVAC?
We prepare some model with students. Atrium is divided on three air zones
and MacroFlow calculate flows caused by temperature differences, but we
would like to add there also flow caused by mechanical system, e.g. inlet in
the lowest part and outlets in windows in the highest part of Atrium.
Kind regards,
Karol
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Karol BANDURSKI M. Sc.
Faculty of Civil and Environemntal Engeneering
Division of Heating, Air Conditioning and Air Protection
Poznan University of Technology
https://www.researchgate.net/profile/Karol_Bandurski
www.put.poznan.pl/~karol.bandurski
Hi Karol
You could try one of the "RoomAirSettings" models in E+.
There should be an example file in the E+ installation directory that can
be run "out of the box". You could mess with this. Rather than coupling
network airflow and hvac network these models are typically based on 1d
finite elements or fixed (known) temperature gradients and don't require
the zone to be split horizontally.
Best
Chris
On Fri, May 24, 2019 at 11:27 AM Karol Bandurski via Bldg-sim <
Hi Chris,
Thank you for your advice!
For now the issue is that we would like to do it as good as possible using IES VE.
Kind regards,
Karol
Hi Karol,
The trick to getting ApacheHVAC and Macroflo to work together in IES VE is the use of a flow controller set to zero at an appropriate point in the HVAC network. For your example, the HVAC network would contain a single zone where you want to add mechanical supply. The upstream side of this zone would have a flow controller set to provide the required flowrate and the downstream side would have a flow controller set to zero volume flow, on continuously. With Macroflo and HVAC both active in ApacheSim, the mechanical supply will be introduced, as defined in the HVAC network, and Macroflo will calculate what subsequently happens to that air (provided there are sufficient Macroflo openings to prevent the run crashing due to overpressurisation). Hope this helps.
Regards,
Neil
[Leeds 30-E-footer-regional.png]
Just adding to Neil's comment regards crashing due to over pressurisation.
You should do some runs with various timesteps. Usually, the shorter the
time step the more stable.
On 24 May 2019 16:04, "Neil Shankland"
wrote:
Dear Chris and Neil
Thank you for your tips!
I hope it lead us to the operating model.
If you know also some reports/guidebook/webinar in this topic I would be grateful for information.
Kind regards,
Karol