Re: [EnergyPlus_Support] Help with combination of AFN-EMS-Ideal Loads-Hybrid Ventilation

Dear Neves,

I forget to mention that if you go ahead with "AvailabilityManager:HybridVentilation" object then you might need to change your modeling approach. So there are two approach (which i am aware of) to model mixed mode cooling/heating and ventilation strategies:

EMS control - prior toÂ AvailabilityManager:HybridVentilation object introduced in E+ (released with v7., if i remember correctly), the EMS was one of the ways to override simulation controls. Sometimes it is challenging too!
AvailabilityManager:HybridVentilation: relatively simple and easy to implement. Â It serves two purposes:Â

1) prevents simultaneous natural ventilation and HVAC system operation,
2) allows users to examine various ventilation strategies to maximize natural ventilationÂ in order to reduce heating/cooling loads.

It seems like you are trying to avoid running Natural ventilation OR mechanical cooling/Heating simultaneously. Based on option/schedule chosen under "Ventilation Control Mode Schedule Name" different control strategies (0-7 based on control parameter like ASHRAE 55, CO2 etc.) Â could be implemented to control hybrid ventilation.

Hope this helps!!

On Thu, Jul 27, 2017 at 1:15 AM, Leticia Neves leneves@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

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Hi, Javed.
Thank you for your answer. I'd already looked, but the problem seems to be on the EMS. Couldn't find a way to fix it.
If you have any specific recommendations, please send it to me.

Regards,
Leticia Neves

On Wed, Jul 26, 2017 at 4:07 PM, Javed Iqbal eee.javed@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@yahoogroups.com> wrote:

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You should look intoÂ AvailabilityManager:HybridVentilation object under I/O reference guide. This could answer most of your concerns.

On Jul 26, 2017 9:00 PM, "Leticia Neves leneves@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@yahoogroups.com> wrote:

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Dear all,

I'm dealing with EMS and hybrid ventilation and I'm having some trouble. I wonder if someone could help me.
I was successful on using EMS to override the modulation of
window opening area in order to have a binary control (on/off). But I settled the EMS to control openings through indoor air temperature and occupancy, so when I added the ideal loads system the HVAC started working together with opened windows. I couldn't find a way to override this. Could someone help me? Attached is my EP model.
Another question that I have: I tried to use EMS + Hybrid ventilation using a regular split system (instead of ideal loads) but the EMS stops working and the windows start the modulation again. Did someone try this option?

I'd appreciate any help anyone could give me.

Best regards,

Assistant Professor Leticia Neves

Dept. of Architecture and Construction

School of Civil Engineering, Architecture and Urban Design

University of Campinas (UNICAMP) - Brazil

Phone. +55 19 3521-2384

Javed Iqbal, LEED AP, CEA

Sr. Energy AnalystÂ