California Energy Commission

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California Energy Commission T-24 Standards
2009 Effective January 1, 2010
Presented by Caecilia Gotama P.E., LEED A.P.,
Principal Gotama Building Engineers, Inc.
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Sustainable development is development which
meets the needs of the present without
compromising the ability of future generations to
meet their own needs. - Gro Harlem
Brundtland, World Commission on Environment and
Development, 1987
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Introduction to the CEC
Introduction to the CEC

• Established in 1978 to reduce Californias
  Energy Consumption.
• The 2008 Standards are the 13th official
  revision since the code inception.
• Has saved 53 billion in electricity and
  natural gas costs since 1978.
• Estimated savings of an additional 23 billion
  by 2013.

Source www.energy.ca.gov/title24/
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Components of T24
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Architectural

• Walls
• Wraps
• Fenestration
• Roofing

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Envelope Highlights
Source 2008 Building Energy Efficiency Standards
- Table 151-B
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Basics to Electrical Title 24

• Three basic methods to calculating lighting
  requirements
• - Complete Building Method
• - Area Category Method
• - Tailored Method
• Added allowances for controls, emergency lighting
  or specific lighting usages.
• Further requirements for day lit areas and
  certain room sizes.

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How Electrical T24 Works!
Total Wattage Installed 59W x 3 fixtures
177 W Total Room Square Footage 130 sq.
ft. Lighting Power Density (LPD) 177W/130sqft
1.36 W/sq. ft. Allowable LPD for office
1.1 W/sq. ft. Allowable LPD for conference
room 1.4 W/sq. ft.
Source 2008 Building Energy Efficiency Standards
- Table 146
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Electrical Indoor Lighting Density

• Offices
• Parking Areas
• Retail
• Track Lighting

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List of Allowed Lighting Changes
Source 2008 Building Energy Efficiency Standards
- Table 146
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Electrical Residential Lighting

• LED Lighting
• Kitchen Lighting
• Permanent Night Light
• Cabinet Lighting

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Lighting Control Highlights

• Astronomical time clock features must maintain
  its time parameters for 7 days after power
  failure.
• Occupancy sensors shall not have override
  switches.
• Dimmers must reduce power consumption by minimum
  65.
• Photo sensor calibration must be remote from
  actual sensor to avoid calibration influence.
• Multi-level occupancy sensors shall be capable of
  turning all lights off by the occupant. First
  stage shall operate 30-70 of the lights.

Source 2008 Building Energy Efficiency Standards
Section 119
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Electrical Residential Lighting Controls

• High and Low Efficacy Lighting
• Exhaust Fan and Lighting
• Outdoor Lighting

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Exterior Lighting Highlights

• Expanded on allowable usage LPDs for specific
  applications.
• Provided tradeoffs between exterior LPDs.
• Calculations will be determined by combined
  total of hardscape areas, specific applications,
  and local ordinances.
• Removed Signage from exceptions list.

Source 2008 Building Energy Efficiency Standards
Section 147
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Mechanical System Highlights

• HVAC system Efficiencies 1/1/10
• Domestic hot water re-circulating loop
• Setback Thermostats
• Demand Control Ventilation
• DDC Controls must have load shedding capabilities

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CO2
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Mechanical

• Residential Thermostat
• Outside Air Supply
• Energy Limitation for Central Air System

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Plumbing Water Heating

• Automatic Air Release Valve
• Check Valve
• Hose Bibb for Bleeding Air from Pump
• Isolation Valve at Each Side of Pump

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Questions and Answers