[Equest-users] Lighting Control

[Joe Fleming]

See pasted excerpt from the equest help manual, below.  Hopefully this
clears up all 4 questions! 

 


"LIGHT-CTRL-TYPE1, LIGHT-CTRL-TYPE2


Takes code-words that specify the type of electric lighting control system
at LIGHT-REF-POINT1 and LIGHT-REF-POINT2, respectively

CONTINUOUS              Specifies a dimming control system in which the
electric light output and power input decrease continuously and linearly as
the daylight illuminance increases. The control action at a daylighting
reference point is illustrated in Figure 19 <JavaScript:TL_11942.HHClick()>
in terms of power input fraction (power input divided by maximum power
input), as the daylight illuminance increases, and light output fraction
(electric light output divided by maximum electric light output).

                                  Figure 19 <JavaScript:TL_11943.HHClick()>
shows that, as the daylight illuminance increases, the fractional light
output decreases from 1.0 (at zero daylight illuminance and maximum input
power) to a value MIN-LIGHT-FRAC at the minimum power fraction,
MIN-POWER-FRAC.

                                  In the example shown in Figure 20
<JavaScript:TL_11944.HHClick()>  the lighting set point (LIGHT-SET-POINT1 or
2) is 45fc, MIN-POWER-FRAC is 0.3, and MIN-LIGHT-FRAC is 0.1. We see that at
zero daylight illuminance the electric lights are on at full power and the
electric illuminance is 50fc. As the daylighting illuminance increases, the
electric power and lighting decrease, reaching a power fraction of 0.3 and
an electric illuminance of 5fc (50 * (MIN-LIGHT-FRAC)) when the daylight
illuminance is 45 fc. Beyond this point, the electric power and illuminance
stay constant as the daylighting illuminance increases.

CONTINUOUS/OFF        Gives a dimming control similar to CONTINUOUS but the
lights turn off completely (i.e., the electric light output and power are
zero) when the total illuminance (electric illuminance plus daylighting
illuminance) exceeds the lighting setpoint. The action is shown in Figure 21
<JavaScript:TL_11945.HHClick()> .

STEPPED                     Specifies the control system shown in Figure 22
<JavaScript:TL_11946.HHClick()> , in which power input and light output vary
in discrete, equally spaced steps. The number of steps (excluding zero) is
given by LIGHT-CTRL-STEPS.

DISCRETE                   Specifies the control system in which power input
and light output vary in discrete, variable spaced steps. The number of
steps is given by DISCRETE-POWER1 and its paired DISCRETE- LIGHT 1 for the
first control point, and DISCRETE-POWER2 and DISCRETE-LIGHT2 for the second
control point."

 

Regards

 

 

Joe Fleming  |  PE, LEED AP BD+C, BEMP

Commissioning Agent / Energy Modeler | The Spinnaker Group

561.602.3132 |  <mailto:joe at thespinnakergroupinc.com>
joe at thespinnakergroupinc.com 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Fakeha
Sehar
Sent: Tuesday, April 15, 2014 2:07 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Lighting Control

 

I wanted to ask about the following

 

a. In eQuest what does dimming 30% light (30% power) lighting control means?

 

b. Other dimming controls like dimming down to 5% light (21% power) has been
explained to provide minimum dimming light 0.05 and require minimum power
0.21 but during day time how does the lighting and power requirements vary
with this type of control for each light source? I mean with this control
minimum lighting can go up to minimum 5% but in what steps will the dimming
be done to eventually reach 5% light (21% power) during day time and then
again increase light level when daylight is reducing? 

 

c. Similar question for other types of dimming controls like down to 10%
light, down to 20% light etc.

 

d. eQuest uses different types of lighting sources like sus. fluorescent
etc, there must be some equations for these sources where can they be found?

 

Regards

 

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