[Equest-users] Lighting Control

[Fakeha Sehar]

Thanks but still I am not satisfied regarding part a and d.
Part a says dimming 30% not down to 30%.
I simulated down to 5% , down to 20% and 30% dimming (DoE 2 default) strategies.
The annual electricity consumption for dimming light down to 5% came the lowest, next 30% dimming  followed by down to 20% dimming.

In part d i am looking for equations used for modeling different types of lamps.
On Tuesday, April 15, 2014 4:45 PM, Joe Fleming <joe at thespinnakergroupinc.com> wrote:
 
Forgot to attach images from the help file.
See below.
 
 
Joe Fleming  |  PE, LEED AP BD+C, BEMP
Commissioning Agent / Energy Modeler | The Spinnaker Group
561.602.3132 |joe at thespinnakergroupinc.com 
 
From:equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Joe Fleming
Sent: Tuesday, April 15, 2014 4:43 PM
To: 'Fakeha Sehar'; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Lighting Control
 
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 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 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 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.
STEPPED                     Specifies the control system shown in Figure 22, 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 |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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