CALIFORNIA TITLE 24: THE ENERGY CODE & CALGREEN

Linwood Engineering Associates, P.C. August 2012

IMPACT OF CALIFORNIA ENERGY CODE

Established 1978 Reduces building energy use

Lighting, Space Conditioning, Water Heating

Stringent 37.5 Million people = Huge Impact

2010 California Statistics Category Total Rank Population 37.5 Million 1/50 Energy Consumption 2,400TWh 2/50 Energy Consumption Per Cap 6,700KWh 50/50 Energy Intensity: GDP/Energy $2.90/kWh 2/50

Annual Energy Consumption per Capita California vs. United States

960,000,000,000KWh = 550 Oil Tankers = JPN Electric Output

ENERGY CODE: METHODS OF COMPLIANCE

Prescriptive Approach Performance Approach

Building must comply with all applicable requirements Commonly used when only one system is in scope (i.e. lighting)

Allows trade-offs between systems. Building uses no more energy that a standard building

Case Study: Pain Du Monde

Lighting Standard 1.37W/DF

Proposed 1.38 W/SF

Failed: 1.0%

Envelope New storefront glazing

Standard 0.47 U 0.61 SHGC

Proposed 0.93 U 0.90 SHGC

Failed: -11.4%

HVAC Standard 10.6 EER 3.2 COP

Proposed 11.2 EER 3.3 COP

Passed: 5.1%

Using the Performance Method, Building passed by 0.7%

ENERGY CODE: LIGHTING

CONTROLS: MANDATORY MEASURES Multi-level control. For when you just dont need that much light. Daylight control. For when the sun already provides enough light. Automatic shutoff. For when you forget to turn off the light.

COMPLIANCE: WATTAGE DENSITY Whole Building. Watts/sf. Area Category. Watts/sf, for each area. Tailored Method. Watts/sf, plus display credits. Use EnergyPro software.

EXAMPLE: Crystal Cove 7916 Difficult calculation: Retail space with lack of display credits. Lighting: Standard 1.410 W/SF Proposed 1.324 W/SF Passed: 3.6%

ENERGY CODE: TRACK LIGHTING

AS IT LOOKS ON PAPER.

150W.

AS THE ENERGY CODE SEES IT.

500W.

ENERGY CODE: BUILDING ENVELOPE

The Energy Code divides California into 16 different Climate Zones.

Requirements include: Roofs Walls Floors Windows (U-factor and RSHG) Doors Skylights

Solar Heat Gain vs Relative Solar Heat Gain:

ENERGY CODE: BUILDING ENVELOPE

ENERGY CODE: BUILDING ENVELOPE

Useful Information Prescriptive Requirements:

Area of west facing windows shall not exceed 40% of the west facing wall. Skylights shall have an area no greater than 5% of the gross roof area.

Performance Approach: Standard Building maxes out at 40% window area

Case Study: Westcliff Plaza Space 1126A

Using the Performance Method, Building passed by 0.7%

Lighting Standard 1.399 W/SF

Proposed 1.18 W/SF

Passed: 8.8%

Envelope Starphire single pane glass

Added R-19 to roof

Failed: -5.3%

HVAC Standard 11.0 EER 3.3 COP Economizer

Proposed 11.0 EER 3.3 COP No Economizer

Failed: -3.0%

Starphire Glass 1/4" uncoated single pane 0.93 U 0.90 SHGC

(2) 1/4" uncoated double pane 0.58 U 0.81 SHGC (2) 1/4" Low-E double pane 0.27 U 0.40 SHGC Climate Zone 6 (Irvine) Requirement 0.77 U 0.61 SHGC

R-13 in a wood framed wall (U=0.102)

R-13 in a metal framed wall (U=0.217)

ENERGY CODE: HVAC

Minimum Efficiency Air Cooled Air Conditioners:

Minimum Efficiency Air Cooled Heat Pumps:

5 tons and < 11 tons 11.2 EER

11 tons and < 20 tons 11.0 EER

11 tons and < 63 tons 10.0 EER

63 tons 9.7 EER

5 tons and < 11 tons 11.0 EER 3.3 COP

11 tons and < 20 tons 10.6 EER 3.2 COP

20 tons 9.5 EER 3.2 COP

EER (Energy Efficiency Ratio): The ratio of net cooling capacity (in Btu/hr) to total rate of electrical energy input (in watts) SEER (Seasonal Energy Efficiency Ratio): The total cooling output of an air conditioner in BTU during its normal usage period for cooling divided by the total electrical energy input in watt-hours during the same period. COP: The rate of heat output to the rate to total energy input

Other Prescriptive Requirements: R-8 insulation required on ductwork located in unconditioned space. Economizers are required for systems supplying over 2,500 cfm.

ENERGY CODE vs. CALGREEN vs. LEED

CA ENERGY CODE CALGREEN LEED

GOVERNING TITLE 24, PART 6 TITLE 24, PART 11 USGBC

MANDATORY PORTIONS

X

X

VOLUNTARY PORTIONS

X

X

SCOPE

ENERGY EFFICIENCY

SITE DEVELOPMENT WATER EFFICIENCY

MATERIAL CONSERVATION RESOURCE EFFICIENCY

ENVIRONMENTAL QUALITY LEED: ENERGY EFFICIENCY

HOW GREEN? CALGREEN TIERS 1 & 2

Mandatory < Tier 1 < Tier 2

CALGREEN HIGHLIGHTS

SITE 5.106.1 PARKING FOR BICYCLES & CLEAN AIR VEHICLES 5.106.8 LIGHT POLLUTION REDUCTION

WATER USE 5.303.1 SEPARATE SUBMETERS 5.303.2 20% WATER USE REDUCTION

MATERIALS / RESOURCES 5.408.1 WASTE DIVERSION 5.410.2 COMMISSIONING

ENVIRONMENTAL QUALITY 5.504 PAINTS, COATINGS, ADHESIVES, ETC

COMING SOON

NEW CODE CYCLE, JANUARY 2014. BUILDING, ENERGY, MEP, CALGREEN.

ENERGY CODE TIGHTENS. 25% OVERALL REDUCTION

CALGREEN EVOLVES. RULE CHANGES. SCOPE NOW COVERS ALTERATIONS:

5.701 ADDITIONS & ALTERATIONS EFFECTIVE

DATE SQ. FT. OF ADDITION

VALUATION OF ALTERATION

JULY 1, 2012 2,000 $500,000 JAN 1, 2014 1,000 $200,000

THANK YOU!