Energyplus shading and lighting control for daylight

asked 2020-07-02 10:01:20 -0600

Giacomo90
71 ●2

updated 2020-07-02 10:29:24 -0600

11931 ●203 ●9 https://www.nrel.gov/b...

Hi everyone. I am quite new to the use of EMS, but I would like to model something not so easy (if I succeed in something hard, then easier thing will not be a problem). I would like to set up a EMS to set a blind system (tilt or height) with a control over the lighting level on the working plan, to use the needed amount of external light during occupation. If not enough from daylight, then I want to switch on the lights, the minimum needed, always when occupation is on. I know How to work with occupation, but I am not sure about blind (which schedule can I set through EMS) and how to assign a preference for the system (daylight prior to electric light). Thank you for any help you may provide me with.

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answered 2020-07-03 08:50:28 -0600

1410 ●5 ●8 http://it.linkedin.com...

Can you think to achieve the same final goal with a different shading device (switchable glazing)?

Let me explain :

if you use a switchable glazing rather window blind as window shading active system you can use the built-in control type MeetDaylightIlluminanceSetpoint (please see WindowShadingControl object). Then use the same illuimnance level (lux) to control your artificial lights through Daylighting:Controls object.

In this way you do not have to build a EMS program and you will probably achieve the same goal (setting dark glazing properties as you glazing+blind)

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answered 2020-07-03 09:38:47 -0600

Giacomo90
71 ●2

Thank you so much for your answer. I have to model an existing building with outdoor shading blinds, in this way, If I correctly understood the switchable glazing shading type, it directly works on the glazing transmittance, setting it according to daylight level using meetdaylightilluminance, and with this it would not switch clear/total dark only, but also average position. Am I right? But I would lose the reflection contribution of external blinds in this way, while it should be consider by using blind shading type, right?

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-Yes, you're right

-Yes you're right, again.

My proposal was a straightforward method havig in mind final goal: control daylighting then artificial lighting to keep 500 (or similar) lux on working plane , and using existing energyplus ojects and controls. Approximations you noticed are standing, but how much will they affect results?

Depending on your knowledge and, above all, on your time available for the necessary testing phase, I'm pretty sure you can set an EMS program that do exaclty what you want . But I see this as an issue worthy of an advice rather than a simple suggestion