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RE: [EnergyPlus_Support] E+ Lights Object: Fixture spec.
It should not. Unless you name them the same.
Similar for electric equipment objects.
At 06:59 AM 10/29/2014, dru.crawley@xxxxxxxxxxx [EnergyPlus_Support]
wrote:
My apologies. You are
correct ? two Lights objects per zone gives a fatal error. (It
shouldn?t!).
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[
mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Wednesday, October 29, 2014 4:56 AM
To: energyplus_support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] E+ Lights Object: Fixture
spec.
If you input two light objects in the same zone, this will give a fatal
error.
Input just one light object, like jim said.
I think this the way.
To:
EnergyPlus_Support@xxxxxxxxxxxxxxx
From:
EnergyPlus_Support@xxxxxxxxxxxxxxx
Date: Tue, 28 Oct 2014 18:13:59 -0400
Subject: Re: [EnergyPlus_Support] E+ Lights Object: Fixture
spec.
You could have a separate Lights object for each fixture.
But EnergyPlus aggregates all the lighting power (watts times schedule)
at that time step at the zone level. So you can have a single Lights
object that aggregates all your light fixtures. Or you could have
a Lights object for each type of lighting (with different
wattages/schedules).
For example, you could have a single Lights object for all lighting power
in the zone:
- Lights,
-
AllLights,
!- Name
-
Zone1,
!- Zone or ZoneList Name
-
OfficeLights,
!- Schedule Name
-
LightingLevel,
!- Design Level Calculation Method
-
,
!- Lighting Level {W}
-
0.9,
!- Watts per Zone Floor Area {W/m2}
-
,
!- Watts per Person {W/person}
-
,
!- Return Air Fraction
-
,
!- Fraction Radiant
-
,
!- Fraction Visible
-
1,
!- Fraction Replaceable
-
,
!- End-Use Subcategory
-
No;
!- Return Air Fraction Calculated from
-
!- Plenum Temperature
Or you can have two objects for each zone -- one each for desk task
lights and overhead fluorescent troffers:
- Lights,
- Desk Task
Light, !- Name
-
Zone1,
!- Zone or ZoneList Name
-
DeskLights,
!- Schedule Name
-
LightingLevel,
!- Design Level Calculation Method
-
,
!- Lighting Level {W}
-
,
!- Watts per Zone Floor Area {W/m2}
-
45,
!- Watts per Person {W/person}
-
,
!- Return Air Fraction
-
,
!- Fraction Radiant
-
,
!- Fraction Visible
-
1,
!- Fraction Replaceable
-
TableLights,
!- End-Use Subcategory
-
No;
!- Return Air Fraction Calculated from
-
!- Plenum Temperature
-
- Lights,
- FluorescentTroffer,
!- Name
-
Zone1,
!- Zone or ZoneList Name
-
OfficeLights,
!- Schedule Name
-
Watts/Area,
!- Design Level Calculation Method
-
,
!- Lighting Level {W}
-
0.8,
!- Watts per Zone Floor Area {W/m2}
-
,
!- Watts per Person {W/person}
-
,
!- Return Air Fraction
-
,
!- Fraction Radiant
-
,
!- Fraction Visible
-
1,
!- Fraction Replaceable
-
OfficeLights,
!- End-Use Subcategory
-
No;
!- Return Air Fraction Calculated from
-
!- Plenum Temperature
On Tue, Oct 28, 2014 at 4:17 PM, Jim Dirkes
jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support]
<
EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
-
- I am not quite sure what you're trying to do, but E+ doesn't concern
itself with lighting fixtures, just watts and usage.
- For example, if you have a 4 tube 40 watts / tube fluorescent light
fixture, you must use about 4 * 40 * 1.25 watts per fixture so as to
include ballast energy. Other fixtures may not have a ballast,
etc. E+ doesn't know or care.
-
- On Tue, Oct 28, 2014 at 3:23 PM,
'jeannieboef@xxxxxxxxx'
jeannieboef@xxxxxxxxx
[EnergyPlus_Support]
<
EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
-
-
- Not to my knowledge. You could check the Lights object fields
available in your .idd file, to see if any reference an external fixture
object.
- Mit freundlichen Grüßen- Sent from my iPhone (excuse the
brevity)
-
- i. A.
- Jean Marais
- b.i.g. bechtold
- Tel. +49 30 6706662-23
- On 28.10.2014, at 17:12, "Eric Allen Youngson
eric@xxxxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support]"
<
EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
-
- Does anyone know EnergyPlus can specify a lighting fixture object to
be referenced by the Lights object?
- Thx
- --
- Eric Youngson
-
eric@xxxxxxxxxxxxxxxxxxxxxxxx
- 503 468 7021
-
-
www.successionecological.com
- 322 NW 6th Ave. Suite 200 | Portland, Oregon
| 97214
- <image001.png>
-
-
-
-
- --
-
-
- James V Dirkes II, PE, BEMP, LEED AP
- The Building
Performance Team
- 1631 Acacia Drive, Grand Rapids, MI 49504
- (M) 616 450 8653
- The more one does what is good, the freer one becomes. There is no
true freedom except in the service of what is good and just.
-
__._,_.___
Posted by: Linda Lawrie <linda@xxxxxxxxxxxxxx>
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