Properties For: Lighting (Room)
Contains controls used to define luminaires and their lighting data properties for simulation. The values entered here determine the power consumption and heat gains of the selected room.
Opens when the Component: Lighting Project Tree object’s pop-up menu is activated in the AECOsim Energy Simulator Project Tree and the Properties menu item is selected.
Setting | Description |
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New | Used to create new luminaires in the selected room. Each of these lighting sub-components’ characteristics can be defined independently. |
Name | 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. |
Design level calculation method | Contains controls used to select the Design level
calculation method to be used for energy simulations.
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Lighting level | 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. |
Watts per Floor Area | 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. |
Watts per Person | 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. |
Schedule | Used to select a default lighting schedule for the lighting component used in the selected room. |
End usage category | 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. |
Exemption | 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. |
Allowance | 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. |
Area | 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. |
Luminaire category | Contains controls used to define the lights or
luminaires as belonging to a certain category. The available categories are:
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. |
Return air fraction | 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). |
Fraction radiant | 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. |
Fraction visible | 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. |
Fraction replaceable | 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. |
Return air fraction calculated from plenum temperature | 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. |
Return air fraction function of plenum temperature coefficient 1 & 2 | 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. |
Notifications panel | Used to validate project data and resolve issues with project data in real time (as it is being entered in the Properties For: dialogs) via errors, warnings and messages. |