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Heating Source |
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Applicability |
All systems that provide heating |
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Definition |
The source of heating for the heating and preheat coils. The choices are:
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Units |
List (see above) |
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Input Restrictions |
As designed |
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Baseline Rules |
Based on the prescribed system type. See Table 3.1.2-3 |
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Heating Source |
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Applicability |
All systems that provide heating |
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Definition |
The source of heating for the heating and preheat coils. The choices are:
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Units |
List (see above) |
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Input Restrictions |
As designed |
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Baseline Building |
Based on the prescribed system type Table 73. Heating Source for Baseline Building
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Total Heating Coil Capacity |
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Applicability |
All systems with heating coils |
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Definition |
The heating capacity of a heating coil at ARI conditions |
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Units |
Btu/h |
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Input Restrictions |
As designed. The capacity would need to be adjusted if the number of UMLH exceeds 300. |
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Baseline Building |
Autosize with a heating oversizing factor of 25%. Sizing calculations shall be based on the heating design day and cooling design day conditions, as defined in Section 3.2.3 of this document. Oversizing would be carried out at zone level where the sizing parameters would be applied to the zone design heating loads, but not the airflow rates. Refer to Section 2.7.2 of this document for more details. |
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Number of Heating Stages |
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Applicability |
Heating systems with multiple stages |
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Definition |
The number of heating stages provided by the system. Multiple stages could be provided via a heat pump or via a multiple-stage gas furnace. |
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Units |
Integer |
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Input Restrictions |
As designed |
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Baseline Building |
Single stage |
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Heating Capacity by Stage |
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Applicability |
Heating systems with multiple stages |
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Definition |
Provides the total heating capacity of each heating stage, at ARI rated conditions. The capacity is expressed as an array, with each entry a fraction of the total rated cooling capacity for the unit. For example, if the stage heating capacity is 48,000 Btu/h and the heating capacity is 96,000 Btu/h, the capacity is expressed as “0.5” for that stage. |
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Units |
Array of fractions |
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Input Restrictions |
As designed |
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Baseline Building |
Not applicable |
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Heating Source |
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Applicability |
All systems that provide heating |
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Definition |
The source of heating for the heating and preheat coils. The choices are:
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Units |
List (see above) |
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Input Restrictions |
As designed |
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Baseline Building |
G3.2 New Construction/Major Alterations Based on the prescribed system type Table 80. Standard 90.1-2022 Section G3.2 Heating Source for Baseline Building
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G3.3 Minor Alterations Same as proposed except if the proposed design includes variable refrigerant flow heat pumps or single-zone systems with electric resistance heat, in these cases air source heat pumps shall be modeled in the baseline design in which case the heating type is electric heat pump. This exception is intended for single zone systems with electric resistance coils and not single zone systems served by central hot water systems. |
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Total Heating Coil Capacity |
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|---|---|
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Applicability |
All systems with heating coils |
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Definition |
The heating capacity of a heating coil at AHRI conditions |
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Units |
Btu/h |
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Input Restrictions |
As designed. The capacity would need to be adjusted if the number of UMLH exceeds 300. |
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Baseline Building |
G3.2 New Construction/Major Alterations Autosize with a heating oversizing factor of 25%. Sizing calculations shall be based on the heating design day and cooling design day conditions, as defined in Section 3.2.3 of this document. Oversizing would be carried out at zone level where the sizing parameters would be applied to the zone design heating loads, but not the airflow rates. Refer to Section 2.7.2 of this document for more details. G3.3 Minor Alterations The total heating coil capacity for the baseline design shall be sized proportionally to the capacities in the proposed design based on sizing runs. |
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Number of Heating Stages |
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|---|---|
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Applicability |
Heating systems with multiple stages |
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Definition |
The number of heating stages provided by the system. Multiple stages could be provided via a heat pump or via a multiple-stage gas furnace. |
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Units |
Integer |
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Input Restrictions |
As designed |
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Baseline Building |
G3.2 New Construction/Major Alterations Single stage G3.3 Minor Alterations Same as proposed design. |
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Heating Capacity by Stage |
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|---|---|
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Applicability |
Heating systems with multiple stages |
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Definition |
Provides the total heating capacity of each heating stage, at AHRI rated conditions. The capacity is expressed as an array, with each entry a fraction of the total rated cooling capacity for the unit. For example, if the stage heating capacity is 48,000 Btu/h and the heating capacity is 96,000 Btu/h, the capacity is expressed as “0.5” for that stage. |
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Units |
Array of fractions |
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Input Restrictions |
As designed |
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Baseline Building |
G3.2 New Construction/Major Alterations Single stage G3.3 Minor Alterations Same as the proposed design. |