Surface: Heat Transfer
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36 Output data in Excel

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The heat transfer surface is necessary for all calculations. There must be at least one heat transfer surface per zone.

Information from the EnergyPlus Input Output Reference:

Field: User supplied surface name
This is a unique character string associated with each heat transfer surface. It is used in several other places as a reference (e.g. as the base surface name for a Window or Door).

Field: Surface Type
Used primarily for convenience, the surface type can be one of the choices – Wall, Floor, Ceiling, Roof. Azimuth (facing) and Tilt are determined from the vertex coordinates. Note that “normal” floors will be tilted 180° whereas flat roofs/ceilings will be tilted 0°. EnergyPlus uses this field’s designation, along with the calculated tilt of the surface, to issue warning messages when tilts are “out of range”. Calculations in EnergyPlus use the actual calculated tilt values for the actual heat balance calculations. Note, however, that a floor tilted 0° is really facing “into” the zone and is not what you will desire for the calculations even though the coordinate may appear correct in the viewed DXF display. “Normal” tilt for walls is 90° -- here you may use the calculated Azimuth to make sure your walls are facing away from the zone’s interior.

Field: Construction Name of Surface
This is the name of the construction (ref: Construction) used in the surface. Regardless of location in the building, the “full” construction (all layers) is used. For example, for an interior wall separating two zones, zone x would have the outside layer (e.g. drywall) as the material that shows in zone y and then the layers to the inside layer – the material that shows in zone x. For symmetric constructions, the same construction can be used in the surfaces described in both zones.

Field: Inside Face Environment
This is the zone name to which the surface belongs.

Field: Outside Face Environment
This value can be one of several things depending on the actual kind of surface.
1) OtherZoneSurface – if this surface is an internal surface, then this is the choice. The value will either be a surface in the base zone or a surface in another zone. The heat balance between two zones can be accurately simulated by specifying a surface in an adjacent zone. EnergyPlus will simulate a group of zones simultaneously and will include the heat transfer between zones. However, as this increases the complexity of the calculations, it is not necessary to specify the other zone unless the two zones will have a significant temperature difference. If the two zones will not be very different (temperature wise), then the surface should use itself as the outside environment. In either case, the surface name on the “outside” of this surface is placed in the next field.
2) ExteriorEnvironment – if this surface is exposed to outside temperature conditions, then this is the choice. See Sun Exposure and Wind Exposure below for further specifications on this kind of surface.
3) Ground – if this surface is exposed to the ground, then this is the choice. The temperature on the outside of this surface will be the Ground Temperature.
4) OtherSideCoeff – if this surface has a custom, user specified temperature or other parameters (See OtherSideCoefficient specification), then this is the choice. The outside face environment will be the name of the OtherSideCoefficient specification.
5) OtherSideConditionsModel – if this surface has a specially-modeled multi-skin component, such as a transpired collector or vented photovoltaic panel, attached to the outside (See OtherSideConditionsModel specification), then this the choice. The outside face environment will be the name of the OtherSideConditionsModel specification.

Field: Outside Face Environment Object
If neither OtherZoneSurface, OtherSideCoeff, or OtherSideConditionsModel are specified for the Outside Face Environment (previous field), then this field should be left blank. For more information refer the input output reference.

Field: Sun Exposure
If the surface is exposed to the sun, then “SunExposed” should be entered in this field. Otherwise, “NoSun” should be entered. Note, a cantilevered floor could have “ExteriorEnvironment” but “NoSun” exposure.

Field: Wind Exposure
If the surface is exposed to the Wind, then “WindExposed” should be entered in this field. Otherwise, “NoWind” should be entered. Note: When a surface is specified with “NoWind”, this has several implications. Within the heat balance code, this surface will default to using the simple ASHRAE exterior convection
coefficient correlation with a zero wind speed. In addition, since the ASHRAE simple method does not have a separate value for equivalent long wavelength radiation to the sky and ground, using “NoWind” also eliminates long wavelength radiant exchange from the exterior of the surface to both the sky and the ground. Thus, only simple convection takes place at the exterior face of a surface specified with “NoWind”.

Field: View Factor to Ground
The fraction of the ground plane (assumed horizontal) that is visible from a heat-transfer surface. It is used to calculate the diffuse solar radiation from the ground that is incident on the surface. For example, if there are no obstructions, a vertical surface sees half of the ground plane and so View Factor to Ground = 0.5. A horizontal downward-facing surface sees the entire ground plane, so View Factor to Ground = 1.0. A horizontal upward-facing surface (horizontal roof) does not see the ground at all, so View Factor to Ground = 0.0.

Field: Number of Surface Vertice Groups
This field specifies the number of sides in the surface (number of X,Y,Z vertex groups).

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