New (Lighting data)
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Used to create new luminaires for rooms of the
selected type. Each of these lighting sub-components’ characteristics can be
defined independently.
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(New) lighting area — When the New icon
is pressed, a new properties panel opens containing options for defining the
new luminaire.
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Delete icon — Used to delete the room
luminaire.
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Name
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Used to enter a name for the luminaire. Once
entered, the name appears in the property separator bar. Minimize the bar when
you are not manipulating the luminaire characteristics.
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Design level calculation method
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Contains controls used to select the Design level
calculation method to be used for energy simulations.
- Lighting level — A
simplified method to calculate the light level in a room. This method is a
series of calculations that uses horizontal illuminance criteria to establish a
uniform luminaire layout in a space. In its simplest form, the lighting level
method is merely the total number of lumens available in a room divided by the
area of the room.
- Illumination per
area — This factor is used, along with the room area to determine the maximum
lighting level as described in the Lighting level method.
- Illumination per
person — This factor is used, along with the room’s number of occupants
(people) to determine the maximum lighting level as described in the Lighting
level method.
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Lighting level
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Sets the lighting level (Illuminance) for the
lighting sub-component when Lighting level is selected as the Design level
calculation method. Illuminance is the measure of perceived power that comes
from light.
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Watts per Floor Area
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Sets the amount of illumination per area unit of
floor space for the lighting sub-component when Illumination per area is
selected as the Design level calculation method. Illuminance is the measure of
perceived power that comes from light.
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Watts per Person
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Sets the amount of illumination per person for the
lighting sub-component when Illumination per person is selected as the Design
level calculation method. Illuminance is the measure of perceived power that
comes from light.
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Schedule
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Used to select a default lighting schedule for the
lighting component used in the selected room.
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End usage category
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Allows you to specify a user-defined end-use
subcategory, for instance, "Lighting Conditioned", "Lighting Unconditioned",
etc. for the lighting component used in the selected room. A new meter for
reporting is created for each unique subcategory. Subcategories are also
reported in the ABUPS table. If this field is omitted or blank, the lights will
be assigned to the General end-use subcategory.
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Exemption
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Used to select an exemption from lighting power
allowance requirements for the luminaire. Although, most lighting power is
subject to the requirements of the ASHRAE 90.1 standard, some lighting for
specialized commercial and display purposes, such as outdoor manufacturing,
retail display windows, televised sports lighting, theatrical productions, and
lighting integral to medical equipment, is exempt. Also exempt are certain
lighting systems or portions of systems required for emergency use.
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Allowance
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Used to select an Allowance type that defines the
luminaire as qualifying for an additional lighting power allowance. An increase
in the lighting power allowance is permitted in cases where lighting is
installed in addition to the general lighting for the room or is used as
display lighting.
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Area
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Used to enter an area the luminaires which qualify
for additional lighting power allowances are to illuminate. The Area field is
disabled when the Allowance property is set to None.
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Luminaire category
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Contains controls used to define the lights or
luminaires as belonging to a certain category. The available categories are:
- Recessed
fluorescent luminaire without lens
- Recessed
fluorescent luminaire with lens
- Downlight compact
fluorescent luminaire
- Downlight
incandescent luminaire
- Not-in-ceiling
fluorescent luminaire
Luminaires add to gains in three ways; Through
visible light, through heat or thermal radiation and through convection. The
location of the lights relative to the ceiling (recessed, downlights or
suspended) affects lighting gains as well.
Each luminaire category affects the relative
amounts of lighting gain. For instance, the total electric input to typical
incandescent lights is converted to 10% visible radiation, 80% thermal
radiation, and 10% convective gain. In contrast, the electric input to typical
fluorescent lights is converted to 20% visible radiation, 20% thermal
radiation, and 60% convective gain.
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Return air fraction
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For ducted luminaires used in the selected room,
defines the fraction of the heat from lights that is directly convected out of
the room and into the zone return air (normally into a return plenum).
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Fraction radiant
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Defines the fraction of heat from the lighting
component that goes into the room as long-wave (thermal) radiation for
luminaires used in the selected room.
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Fraction visible
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Defines the fraction of heat from the lighting
component that goes into the room as visible (short-wave) radiation for
luminaires used in the selected room.
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Fraction replaceable
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Used to define the maximum fraction of the lighting
power that may be turned off and replaced with natural daylighting for
luminaires used in the selected room.
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Return air fraction calculated from plenum
temperature
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When on, the Return air fraction is calculated for
luminaires used in the selected room by assuming that it is due to conduction
of some of the lighting component heat into the zone’s return air plenum and
that the amount of the conduction depends on the plenum air temperature. This
should only be used for luminaires that are recessed and non-vented.
– When off, the specified Return air fraction is
used.
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Return air fraction function of plenum temperature
coefficient 1 & 2
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Used to set the two Return air fraction function of
plenum temperature coefficients, and are enabled only when the Return air
fraction calculated from plenum temperature option is checked. The return air
fraction is calculated each time step using the following:
(Return Air Fraction)
calculated
= C1 – C2 x T
plenum
– Where Tplenum is the
previous-time-step value of the return plenum air temperature, and C1 and C2
are the values of the coefficients.
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