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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Used to view or change the surface Sub type from
Ground floor to another floor sub-type. The Sub type drop-down list is filtered
and contains only floor sub types.
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Name
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Used to enter a name for the ground floor. The name
entered here appears appended to the ground floor object on the
project
tree dialog.
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Construction
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Used to view of change the ground floor
material construction
definition.
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Dimensions
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Displays overall dimensions of the selected ground
floor.
- Length — Disabled
for the ground floor sub-type.
- Width — Disabled
for the ground floor sub-type.
- Height — Disabled
for the ground floor sub-type.
- Area — Displays the
total area of the selected ground floor.
- Volume — Disabled
for the ground floor sub-type.
- Orientation —
Displays the orientation of the ground floor relative to the building
orientation. Building orientation is defined in the
Building
Properties dialog.
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Heatflow
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Contains controls used to view and set Heatflow data
for the ground floor. Heatflow refers to the energy transfer occurring through
a surface’s material construction. Heatflow is established automatically as
rooms are created. OpenBuildings Energy Simulator determines if the adjacent space below the room floor is in
contact with another room below. If no adjacent room is found under the floor,
the surface is defined as being of the surface sub-type ground floor.
- Type — Used to
display and modify the nature of the heatflow occurring through the ground
floor.
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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. When on, calculated surface
emissivity and absorption coefficients are overridden, enabling you to define
your own thermal properties (in the Materials Manager dialog).
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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External surface
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Contains controls used to display thermal transfer
properties for external surface types such as the ground floor. External
surface construction details are read only properties. External surface
construction details are defined using the controls on
Materials Manager.
- Surface emissivity
— Displays the construction surface emissivity factor. Surface emissivity is a
measure of the efficiency in which a surface emits thermal energy. It is
defined as the fraction of energy being emitted relative to that emitted by a
thermally black surface (a black body). A black body is a material that is a
perfect emitter of heat energy and has an emissivity value of 1. A material
with an emissivity value of 0 would be considered a perfect thermal mirror.
- Absorption
coefficient — Displays the absorption coefficient for the construction's
external surface. The absorption coefficient is a number between 0 and 1. The
lower a construction's external surface solar absorption coefficient, the less
solar heat it transmits.
- Upward-U-Value —
Displays the calculated outside surface U-value or thermal transmittance of
energy traveling upward through the selected construction.
- Downward-U-Value —
Displays the calculated outside surface U-value or thermal transmittance of
energy traveling downward through the selected construction.
- Horizontal-U-Value
— Displays the calculated outside surface U-value or thermal transmittance of
energy traveling horizontally through the selected construction.
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Ground floor
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Contains controls used to display insulation and
ventilation properties for the Ground floor surface type. Ground floor
Construction details properties are read only properties. Ground floor
Construction details are defined using the controls on
Materials Manager dialog.
- Insulation type —
Displays the insulation type used for the ground floor.
- Insulation
thickness — Displays the insulation thickness used for the ground floor.
- Insulation width —
Displays the total insulation width used for the ground floor.
- Insulation material
— Used to display the insulation material used for the ground floor. By
default, the material drop-down list contains a single insulation material.
This is a filtered display, which is also read only. To change the insulation
material, use the
Defaults Manager dialog to change the
default ground floor construction definition, or the
Room Type Manager dialog to define
ground floor constructions using other insulating materials for different room
types.
- Underfloor space
height — For ground floors with an outside air space below. Displays the height
above the solid ground to the underside of the exposed floor.
- Ventilation opening
area — Displays the total area of ventilation openings in the selected
construction.
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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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