Buildings shall comply with at least one of the following:
- More efficient HVAC performance in accordance with Section C406.2.
- Reduced lighting power density system in accordance with Section C406.3.
- Enhanced lighting controls in accordance with Section C406.4.
- On-site supply of renewable energy in accordance with Section C406.5.
- Provision of a dedicated outdoor air system for certain HVAC equipment in accordance with Section C406.6.
- High-efficiency service water heating in accordance with Section C406.7.
Tenant spaces shall comply with Section C406.2, C406.3, C406.4, C406.6 or C406.7. Alternatively, tenant spaces shall comply with Section C406.5 where the entire building is in compliance.
Equipment shall exceed the minimum efficiency requirements listed in Tables C403.2.3(1) through C403.2.3(7) by 10 percent, in addition to the requirements of Section C403. Where multiple performance requirements are provided, the equipment shall exceed all requirements by 10 percent.Variable refrigerant flow systems shall exceed the energy efficiency provisions of ANSI/ASHRAE/IES 90.1 by 10 percent. Equipment not listed in Tables C403.2.3(1) through C403.2.3(7) shall be limited to 10 percent of the total building system capacity.
The total interior lighting power (watts) of the building shall be determined by using 90 percent of the lighting power values specified in Table C405.4.2(1) times the floor area for the building types, or by using 90 percent of the interior lighting power allowance calculated by the Space-by-Space Method in Section C405.4.2.
Interior lighting in the building shall have the following enhanced lighting controls that shall be located, scheduled and operated in accordance with Section C405.2.2.
- Luminaires shall be capable of continuous dimming.
- Luminaires shall be capable of being addressed individually. Where individual addressability is not available for the luminaire class type, a controlled group of not more than four luminaries shall be allowed.
- Not more than eight luminaires shall be controlled together in a daylight zone.
Fixtures shall be controlled through a digital control system that includes the following function:
- 4.1. Control reconfiguration based on digital addressability.
- 4.2. Load shedding.
- 4.3. Individual user control of overhead general illumination in open offices.
- 4.4. Occupancy sensors shall be capable of being reconfigured through the digital control system.
- Construction documents shall include submittal of a Sequence of Operations, including a specification outlining each of the functions in Item 4 of this section.
- Functional testing of lighting controls shall comply with Section C408.
Total minimum ratings of on-site renewable energy systems shall comply with one of the following:
- Provide not less than 0.50 watts per square foot (5.4 W/m2) of conditioned floor area.
- Provide not less than 3 percent of the energy used within the building for building mechanical and service water heating equipment and lighting regulated in Chapter 4.
Buildings covered by Section C403.4 shall be equipped with an independent ventilation system designed to provide not less than the minimum 100-percent outdoor air to each individual occupied space, as specified by theInternational Mechanical Code . The ventilation system shall be capable of total energy recovery. The HVAC system shall include supply-air temperature controls that automatically reset the supply-air temperature in response to representative building loads, or to outdoor air temperatures. The controls shall reset the supply-air temperature at least 25 percent of the difference between the design supply-air temperature and the design room-air temperature.
Buildings shall be of the following types to use this compliance method:
- Group R-1: Boarding houses, hotels or motels.
- Group I-2: Hospitals, psychiatric hospitals and nursing homes.
- Group A-2: Restaurants and banquet halls or buildings containing food preparation areas.
- Group F: Laundries.
- Group R-2: Buildings with residential occupancies.
- Group A-3: Health clubs and spas.
- Buildings showing a service hot water load of 10 percent or more of total building energy loads, as shown with an energy analysis as described in Section C407.
The building service water-heating system shall have one or more of the following that are sized to provide not less than 60 percent of hot water requirements, or sized to provide 100 percent of hot water requirements if the building shall otherwise comply with Section C403.4.7:
- Waste heat recovery from service hot water, heat-recovery chillers, building equipment, process equipment, or a combined heat and power system.
- Solar water-heating systems.