Category
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Displays the surface category. Category is a read
only property.
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Sub type
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Displays the surface sub-type as Window. This
property is disabled, and can not be changed.
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Name
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Used to enter a name for the window. The name
entered here appears appended to the window object on the Energy Simulator Project
Tree dialog box.
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Construction
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Used to view of change the window
material construction
definition.
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Dimensions
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Displays overall dimensions of the selected window.
- Reference point —
Used to establish a point on the window which is to the used as a reference
when manipulating the window width and height. The reference points are:
- Left/Top
- Left/Center
- Left/Bottom
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Center/Top
- Center/Center
- Center/Bottom
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Right/Top
- Right/Center
- Right/Bottom
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- Width — Displays
the width (horizontal distance) of the window shape element when viewed from a
point normal to it.
- Height — Displays
the height (vertical distance) of the window shape element when viewed from a
point normal to it.
- Area — Displays the
total area of the selected window.
- Volume — Disabled
for the window sub-type.
- Orientation —
Displays the orientation of the window relative to the building orientation.
Building orientation is defined in the
Properties
For: Building
dialog.
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Recess shading
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Contains controls used to define recesses around
windows. The recesses defined here represent the distances between the edges of
the window surface to the actual glazing of the window, typically due to the
window framing.
- Top distance — Sets
the distance from the top of the window opening or frame to the start of the
window glazing.
- Top overhang — Sets
the recess distance at the top of the window. The distance is measured from the
top of the window’s surface opening to the window glazing.
- Side recess — Sets
the recess distance on the sides of the window. The distance is measured from
the side of the window’s surface opening to the window glazing.
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Blind shading
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Contains controls used to define how shading from
blinds is controlled.
- Control type:
- Always off –
Controls for the selected window’s blinds are always off. Selecting this
options disables the blind schedule property.
- Always on –
Controls for the selected window’s blinds are always on. Selecting this options
disables the blind schedule property.
- Depending on
schedule – Controls for the selected window’s blinds are always turned on or
off based on the selected schedule. Selecting this options enables the blind
schedule property.
- Schedule — Used to
select a blind shading schedule. All available blind shading schedules are
provided on the Schedule pick list.
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Common
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Displays common construction details for all surface
sub-types. Common construction details are read only properties.
- Category — Displays
the construction category associated with the surface.
- Total thickness —
Displays the surface total thickness which included all the material layers
(solids and air gaps) that make up the construction.
- Decrement factor
(internal) — Displays a Decrement factor associated with the construction’s
inside surface. The Decrement factor is used to calculated the amount a thermal
wave is decreased in intensity during its propagation process from the outside
to the inside of the surface construction.
- Decrement factor
(external) — Displays a Decrement factor associated with the construction’s
exterior surface. The Decrement factor is used to calculated the amount a
thermal wave is decreased in intensity during its propagation process from the
outside to the inside of the surface construction.
- Fixed thermal
properties — Used to display the surface construction setting related to its
thermal properties which are defined in the Materials
Manager dialog box. When on, calculated surface emissivity and absorption
coefficients are overridden, enabling you to define your own thermal properties
(in the Materials Manager dialog box). When off, the
calculated transmission values are used.
- Admittance
(internal) — Displays the amount of heat that passes through a unit area of the
constructions’s inside surface, when its external face is subject to a unit
temperature change.
- Admittance
(external) — Displays the amount of heat that passes through a unit area of the
constructions’s external surface, when its inside face is subject to a unit
temperature change.
- Time lag (internal)
— Displays the time it takes for heat generated by the sun to transfer from the
outside, through the construction, to the inside surface of the construction
into the building envelope, and affect the internal conditions.
- Time lag (external)
— Displays the time it takes for heat lost to transfer from the inside, through
the construction, to the external surface of the construction from the building
envelope.
- Weight (internal) —
Displays the construction inside surface’s weight per unit area.
- Weight (external) —
Displays the construction external surface’s weight per unit area.
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Glazing
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Contains controls used to display solar heat gains,
gains coefficients and transmittance properties for the Window surface type.
Glazing Construction details properties are read only properties. Glazing
Construction details are defined using the controls on Materials Manager dialog
box.
- Glazed amount —
Displays the amount of glazing the window has as a percentage or as a ratio.
- Light transmittance
— Displays the amount of daylight striking the window glazing that passes
through to the inside as a ratio. Glazings with a high light transmittance
appear relatively clear and provide sufficient daylight and unaltered views;
however, they can create glare problems. Glazings with low light transmittance
are best used in highly glare-sensitive conditions, but can create gloomy
interiors under some weather conditions and diminished views.
- Average solar gain
factor air — Used to calculate total heat gain through the window, the Average
solar gain factor air property represents the average solar gain over a 24 hour
period for the air space between the inside surface of the window glass and
internal shading. Solar gain factor refers to an estimate of the heat gain due
to transmitted and absorbed solar energy through a benchmark glazing (1/8 or 3
mm clear glass) at a specific latitude, time and orientation.
- Cyclic solar gain
factor air — Used to calculate total heat gain through the window, the Cyclic
solar gain factor air property represents the hourly swing of the solar gain
over a 24 hour period for the air space between the inside surface of the
window glass and internal shading. Solar gain factor refers to an estimate of
the heat gain due to transmitted and absorbed solar energy through a benchmark
glazing (1/8 or 3 mm clear glass) at a specific latitude, time and
orientation.
- Shading coefficient
— Displays the Shading coefficient value associated with the window. This
dimensionless indicator is the ratio of the solar heat gain of the selected
glazing compared to a benchmark glazing (1/8 or 3 mm clear glass) under
identical conditions.The Shading coefficient along with the Solar heat gain
coefficient indicate the total solar heat gain and are used in cooling load
calculations.
- Solar heat gain
coefficient — Displays the Solar heat gain coefficient value associated with
the window. This dimensionless indicator is the ratio of the total transmitted
solar heat energy to incident solar energy. It typically ranges from 0.9 to 0.1
where lower values indicate lower solar gain.The Solar heat gain coefficient
along with the Shading coefficient indicate the total solar heat gain and are
used in cooling load calculations.
- Average solar gain
factor env. — Used to calculate total heat gain through the window, the Average
solar gain factor env. property represents the average solar gain over a 24
hour period for the air inside the room (inside the internal shading). Solar
gain factor refers to an estimate of the heat gain due to transmitted and
absorbed solar energy through a benchmark glazing (1/8 or 3 mm clear glass) at
a specific latitude, time and orientation.
- Cyclic solar gain
factor env. light — Used to calculate total heat gain through the window, the
Cyclic solar gain factor env. light property represents the hourly swing of the
solar gain over a 24 hour period for the air inside the room (inside the
internal shading) for thermally light rooms. A thermally light room retains the
transmitted solar energy to a lesser degree from a thermally heavy room. Solar
gain factor refers to an estimate of the heat gain due to transmitted and
absorbed solar energy through a benchmark glazing (1/8 or 3 mm clear glass) at
a specific latitude, time and orientation.
- Cyclic solar gain
factor env. heavy — Used to calculate total heat gain through the window, the
Cyclic solar gain factor env. heavy property represents the hourly swing of the
solar gain over a 24 hour period for the air inside the room (inside the
internal shading) for thermally heavy rooms. A thermally heavy room retains the
transmitted solar energy longer from a thermally light room. Solar gain factor
refers to an estimate of the heat gain due to transmitted and absorbed solar
energy through a benchmark glazing (1/8 or 3 mm clear glass) at a specific
latitude, time and orientation.
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Layers
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Contains controls used to display the surface’s
construction material layers in a read only table. The table displays thermal
properties for each layer such as the thickness, density, conductivity,
specific heat and vapor resistivity.
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