// CODE SNIPPET

A5.203.1.1 Tier 1 and Tier 2 Prerequisites

California Green Building Standards Code 2019 > A5 Nonresidential Voluntary Measures > A5.203 Performance Approach > A5.203.1 Energy Efficiency > A5.203.1.1 Tier 1 and Tier 2 Prerequisites

JUMP TO FULL CODE CHAPTER

To comply with Tier 1, ONE of the following efficiency measures is required for all applicable components of the building project. To comply with Tier 2, TWO of the following efficiency measures are required.

A5.203.1.1.1 Outdoor Lighting

Newly installed out door lighting power shall be no greater than 90 percent of the Allowed Outdoor Lighting Power, and general hardscape lighting within the scope of Title 24, Part 6, Section 140.7(b)1 shall have a color temperature no higher than 3000K. The Allowed Outdoor Lighting Power calculation is specified in Title 24, Part 6, Section 140.7, Requirements For Outdoor Lighting.

Exception: The color temperature requirement is not applicable to the applications identified in the exceptions to Section 140.7(a) nor to the applications identified as "specific applications" in Section 140.7(b)2 and Table 140.7.

A5.203.1.1.2 Service Water Heating in Restaurants

Newly constructed restaurants 8,000 square feet or greater and with service water heaters rated 75,000 Btu/h or greater shall install a solar water-heating system with a minimum solar savings fraction of 0.15.

Exceptions:

Buildings with a natural gas service water heater with a minimum of 95-percent thermal efficiency.
Buildings where greater than 75 percent of the total roof area has annual solar access that is less than 70 percent. Solar access is the ratio of solar insolation, including shade, to the solar insolation without shade. Shading from obstructions located on the roof or any other part of the building shall not be included in the determination of annual solar access.

A5.203.1.1.3 Warehouse Dock Seal Doors

Exterior loading dock doors that are adjacent to conditioned or indirectly conditioned spaces shall have dock seals or dock shelters installed at the time of permitting. This requirement shall apply to newly constructed buildings and to loading dock doors added to existing buildings.

A5.203.1.1.4 Daylight Design Power Adjustments Factors (PAFs)

Daylighting devices shall be installed as specified in Title 24, Part 6, Section 140.3(d).

A5.203.1.1.5 Exhaust Air Heat Recovery

Heat recovery requirements based on ASHRAE 90.1, Section 6.5.6.1 are adapted and modified for California climate zones as described below.

Systems with minimum design outdoor air fraction of 80 percent or greater and supply air flow of 200 cfm or greater in climate zones 2, 9, 10, 11, 12, 13, 14, 15 shall have a heat recovery system.
Heat recovery systems required by this section shall result in a net sensible energy recovery ratio of at least 60 percent for both heating and cooling as tested using AHRI 1060-2014 or 1061-2014 and certified by AHRI. A 60 percent sensible energy recovery ratio shall mean a change in the dry-bulb of the outdoor air supply equal to 60 percent of the difference between the outdoor air and exhaust air dry-bulb at design conditions. Provisions shall be made to bypass or control the energy recovery system to permit air economizer operation as required by Title 24, Part 6, Section 140.4(e), Economizers.

Exceptions:

Systems serving spaces that are not cooled and that are heated to less than 60°F.
Where more than 60 percent of the outdoor air heating energy is provided from site-recovered energy.
Where the sum of the airflow rates exhausted and relieved within 20 feet of each other is less than 75 percent of the design outdoor air- flow rate, excluding exhaust air that is:
1. Used for another energy recovery system;
2. Not allowed by ASHRAE Standard 170 for use in energy recovery systems with leakage potential; or
3. Of Class 4 as defined in ASHRAE Standard 62.1.
Systems expected to operate less than 20 hours per week.