Title 24 Presentation including CalGreen and LEED
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Transcript of Title 24 Presentation including CalGreen and LEED
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CALIFORNIA TITLE 24: THE ENERGY CODE & CALGREEN
Linwood Engineering Associates, P.C. August 2012
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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
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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%
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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%
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ENERGY CODE: TRACK LIGHTING
AS IT LOOKS ON PAPER.
150W.
AS THE ENERGY CODE SEES IT.
500W.
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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:
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ENERGY CODE: BUILDING ENVELOPE
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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)
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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.
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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
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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
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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
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THANK YOU!