Re: [EnergyPlus_Support] Re: Mimicking occupant behaviour

No. My wish is not to use EMS at all. This excersize is aimed at simulating buildings with user operated windows

1) Zone level CO2 DCV for windows from, but including modulation of opening factor of all zone windows by zone ACH.

This control must include for

aa) override limits based on indoor (radiant average seems more appropriate) and outdoor temperatures (I coupled these somewhat to zone heating setpoints) as well as

bb) sensing occupation

which can turn ventilation either on or off...

Have a look at my logic (which can surely be improved.

My initial results show that the windows are now used (only during occupation) to

a) control room air quality via CO2

b) cooling

Currently EMS can achieve this baring the zonelevel opening factor control, but it is not the final user friendly solution...and dynamic opening factor modulation will yield better, more robust solutions. Modulation may have to be step-wise to reflect that windows typically have only one or two open positions, or step through the zone's windows one by one, to reflect that not all windows are opened at once.

I hope this makes sense.

Jean

Sent from my iPhone (excuse the brevity)

Mit freundlichen GrÃ¼Ã?en

i. A.

Jean Marais

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Building Energy Modeling with DesignBuilder and EnergyPlus

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On 15.05.2013, at 16:04, Lixing Gu <gu@xxxxxxxxxxxx> wrote:

Jean:

Thanks for your updates. Let me summarize your wish list:

1 Zone level EMS control
2 Zone ACH modulation with given min and max limits

It should be pointed out that both features can not co-exist in the code. When EMS is launched, it takes over everything.

Best regards,

Lixing

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Jean Marais
Sent: Wednesday, May 15, 2013 8:28 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx; gu@xxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Re: Mimicking occupant behaviour - Window opening

Since I can't modulate the openings, I have found a good compromise for big windows is setting the opening factors for all openable windows at 10%. This reduces the ACHs from 40 to 4 or 6 depending on winter or summer conditions. Attached is a somewhat improved model.
I'm going to implement this on a big model soon using macros to set up the EMS per zone. If you'd like it let me know.
Regards,
Jean.

On 15 May 2013 11:32, Jean Marais <jeannieboef@xxxxxxxxx> wrote:
Hi Lixing,
Here is my test file for window opening. The results are good at the current settings, however, as stated before, this would be better if I could modulate the window opening factor at zonelevel based on infiltration velocity or ACH.
The EMS with the logic is at the bottom of the idf section.
Kind regards,
Jean

On 14 May 2013 22:34, Lixing Gu <gu@xxxxxxxxxxxx> wrote:

Jean:

Yes. Your understanding is correct. The modulation is not available for
Constant Control, because the Constant Control does not have any sensor
ranges to be modulated. It is a user control. A possible improvement is to
allow a schedule, so that users have a choice to vary opening values with
time.

Unfortunately, the current EMS override is surface based. It is possible to
allow zone level control using EMS.

Hope this helps.

Lixing

-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Jean marais
Sent: Tuesday, May 14, 2013 8:50 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Mimicking occupant behaviour - Window
opening
I've got some innitial results.
Q1) I would like to modulate the opening fraction at zone level similarly to
AirFlow Network Window/Door Opening,Venting Opening Factor,[Fraction] (at
surface level), but it seems this is only possible with Temperature control
not Constant control. What do you think?

I would like to modulate because at large inside/outside dTs there are huge
ACH taking place. The key here is zonelevel control.

regards,
Jean.
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