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Re: [EnergyPlus_Support] EMS - Exterior lighting control



Chris,

This is almost trivial to implement. I promise that the first time using EMS is confusing, but then it gets much better. This one is very simple.

Declare an EMS sensor to track your output variable for diffuse solar (look at the .rdd file after a run and/or the I/O reference guide)
You need to declare an ems actuator. From memory you have an actuator for “Design Power” for the ExteriorLights object (the exterior fuel equipment and water equipment don’t have it), so that’s easy. Note that Another option is to actuate the schedule value (use a schedule constant for eg and change the value), which would be the way to go for an Exterior:FuelEquipment object for eg.
You’ll need to write an ems program with a simple IF statement, and reference that in a program calling manager.

I’ve answered a pretty similar question on unmethours recently where I added a snippet EMS code to model an exterior water pump, you should be able to find that (on my phone right now, sorry...)


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Julien

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Le 22 déc. 2017 à 23:38, Jean Marais jeannieboef@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> a écrit :

 

I'm quite sure you need to include logic to account for winter summer local time shifts if your country has them. Remind me in Jan, I'll send over a script.

Am 21.12.2017 3:57 vorm. schrieb "'Jones, Christopher' christopher.r.jones@xxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>:
 

Jim,

Thanks for your reply. Astronomical Clock works well. I was wanting to take into account sky conditions, setting the operation based on diffuse solar level. I’ve been using IES VE and I create a formula profile and a time switch profile... If diffuse solar is less than threshold � on, else � offoff..

 

 

 

Christopher R. Jones, P.Eng.

Technical Specialist

Sustainability & Energy

 

T +1 416-644-0252

 

2300 Yonge Street, Suite 2300

Toronto, ON M4P 1E4 Canada

wsp.com

 

 

Please consider the environment before printing...

 

 

From: EnergyPlus_Support@yahoogroups.com [mailto:EnergyPlus_Support@yahoogroups.com]
Sent: Monday, November 27, 2017 8:52 AM
To: EnergyPlus_Support@yahoogroups.com
Subject: Re: [EnergyPlus_Support] EMS - Exterior lighting control

 

 

Dear Chris,

There is probably no need to use EMS. Consider:

  1. You may assign a schedule to the exterior lights in that object (e.g., OFF 0000 - 0600)
  2. You may also define the "Control option" (with or without a schedule) as "Astronomical Clock". This turns on the lights at sunset and off at sunrise - latitude and seasonally adjusted!

<image002.png>

 

On Tue, Nov 21, 2017 at 12:21 PM, 'Jones, Christopher' christopher.r.jones@xxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@yahoogroups.com> wrote:

 

I am completely unfamiliar with EMS but it seems like it would be a valid way to control exterior lighting.

 

A typical control for exterior lighting is using a photocell but disabled between midnight and 6:00 am. The EMS Sensor could be Output:Variable,*,Site Diffuse Solar Radiation Rate per Area,hourly; !- Zone Average [W/m2].

 

But I am not sure of how to combine this with a clock schedule to disable the lights between midnight and 6:00 am?

 

 

 

 

Christopher R. Jones, P.Eng.

Technical Specialist

Sustainability & Energy

 

<image001.png>

T +1 416-644-0252

 

2300 Yonge Street, Suite 2300

Toronto, ON M4P 1E4 Canada

wsp.com

 

 

Please consider the environment before printing...

 

 

 



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Posted by: Julien Marrec <julien.marrec@xxxxxxxxx>


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