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Orientation |
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Applicability |
All projects |
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Definition |
The building orientation |
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Units |
0-360 azimuth |
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Input Restrictions |
As designed |
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Baseline Rules |
The baseline building performance shall be generated by simulating the building with its actual orientation and again after rotating the entire building 90, 180, and 270 degrees, then averaging the results. The building shall be modeled so that it does not shade itself. Exceptions: a. If it can be demonstrated to the satisfaction of the rating authority that the building orientation is dictated by site considerations. b. Buildings where the vertical fenestration area on each orientation varies by less than 5%. NOTE: Exception ‘a’ would need a flag on the UI and if checked, it would need to be supported through documentation. |
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Shading of Building Site |
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Applicability |
All projects |
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Definition |
Shading of building fenestration, roofs, or walls by other structures, surrounding terrain, vegetation, and the building itself |
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Units |
Data structure |
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Input Restrictions |
The default is for the site to be unshaded. The user may input the necessary information to model shading of the building site by permanent objects or features likely to significantly reduce incident solar loads on the building site. “Permanent” here means likely to remain for the life of the building or likely to be replaced by objects that will produce similar shading over the life of the building. All shading elements shall be modeled that have a height greater than their distance from the building and width facing the proposed design greater than one third of the building width. Smaller shading elements can be modeled at the discretion of the energy modeler. |
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Baseline Rules |
The proposed and baseline building designs are modeled with identical assumptions regarding shading of the building site. |
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Local Terrain |
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Applicability |
All projects |
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Definition |
An indication of how the local terrain shields the building from the prevailing wind. Estimates of this effect are provided in the ASHRAE Handbook of Fundamentals. |
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Units |
Choose from the following list
Adjustments for local terrain should be made in accordance with the ASHRAE HOF. |
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Input Restrictions |
The default is “Towns and cities”. |
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Baseline Rules |
The baseline building local terrain should be the same as the proposed design. |
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Shading of Building Site |
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Applicability |
All projects |
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Definition |
Shading of building fenestration, roofs, or walls by other structures, surrounding terrain, vegetation, and the building itself |
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Units |
Data structure |
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Input Restrictions |
The default is for the site to be unshaded. The effect that structures and significant vegetation or topographical features have on the amount of solar radiation being received by a structure shall be adequately reflected in the computer analysis. All elements whose effective height is greater than their distance from the proposed building and width facing the proposed building is greater than one-third of the proposed building are required to be accounted for in the analysis. |
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Baseline Building |
The proposed design and baseline building are modeled with identical assumptions regarding shading of the building site. |