Post on 08-Apr-2018
transcript
,
and the new 2013 Title 24 Energy Standards
Presented by
Dave Intner, AIA and Kavita Rodrigues, CEPE | Southern California Edison | October 1st, 2014
Introduction
California Advanced Homes Program
CAHP is a statewide residential energy efficiency program available to both single family and multifamily projects.
The program encourages best practices in energy efficiency, green building and sustainability through:
• Financial Incentives
• Independent third party verification for quality control
• Energy design assistance
2014 Program Redesign
2014 CAHP Redesign
• Align CAHP with statewide 2020 Zero Net Energy Residential Goal
• Establish CAHP as a vehicle for ZNE market Transformation in California
• Include all energy end uses within a home’s envelope
• Create a program that can adapt to new technologies
Percent better than code includes only 25 – 70% of a home’s energy use
The CAHP Score
Derived from the CA HERS Design Rating
• Includes all energy end uses within the envelope including lighting, appliances & plug loads
• Calculated within the Title-24 energy modeling software
• Uses Time Dependent Valuation – TDV
2014 Program Redesign
2014 CAHP SF
2014 CAHP Incentive Structure
2014 CAHP MF – Low Rise
• $300 for program entry CAHP score of 84
• $100 for each point down to 75
• $200 for each point thereafter
• $150 for program entry CAHP score of 84
• $50 for each point down to 75
• $100 for each point thereafter
Single Family
Multi Family
CAHP points – New incentive bonuses
CAHP points reduce your CAHP score and increase your incentive
• 5 points – Future Code Preparation measures
• 3 points – DOE Zero Energy Ready Home
• 5 points – SF only - Low Energy Use bonus (100,000 kTDV/year)
• 5 points – SF only Ultra Low Energy Use bonus (60,000 kTDV/year
Additional points are under development including
• 100% high efficacy lighting
• EnergyStar Appliances Package standard
• Home Energy Management SystemsNew Technologies
2014 CAHP Incentive Bonuses
Sample 2014 CAHP Incentive Report
CBECC-Res or EnergyPro will generate the CAHP incentive report, which shows your CAHP score, incentive and energy-use data of the home
At the moment the CAHP Score and Incentive Estimate Tool is available at:
cahp-pge.com/process
2014 CAHP Incentive Report
Title 24 2013 Residential
Overview
� New Simulation Engine – CSE
� All prescriptive packages have been condensed to one – Package A
� PV may be used as a compliance option for zones 9-15 with a minimum 2kW system size
� If PV is used to show compliance the project cannot apply for the NSHP rebate
Title 24, 2013- Envelope
Windows – Mandatory• Maximum Fenestration U-factor = 0.58
Windows – Prescriptive• Prescriptive U-factor = 0.32
(all climate zones)• Prescriptive SHGC = 0.25
(except zones 1, 3 &5)• Prescriptive maximum west facing area of 5%
(except zones 1,3,5 &6)
Site built fenestration can use Appendix NA6 “Alternate Default Fenestration Procedure to Calculate Thermal Performance”
Double pane, Metal frame, Low-E
U-factor 0.56-0.70SHGC 0.26-0.4
http://www.efficientwindows.org
Title 24, 2013- Envelope
Insulation – MandatoryCeiling/Roofs
• R-30 (Weighted average U- Factor<0.031)• Exception: Alterations = R19
Walls• Frame wall 2x4 = R13 (Weighted average
U- Factor <0.102)• Frame wall 2x6 = R19 (Weighted average
U- Factor <0.074)Raised Floors
• R19 (Weighted average U- Factor <0.037)
Courtesy of Martyn Dodd @EnergySoft Inc
Title 24, 2013- Envelope
Insulation – PrescriptiveCeiling/Roofs
• R38 (zones 1, 11-16)• R30 in zones 2-10
Walls• U-factor = 0.065
• R-15 in 2x4 wall cavity + R-4 rigid insulation over framing
OR• R-13 in 2x4 wall cavity + R-5 rigid
insulation over framing
Radiant Barriers are now a prescriptive requirement in Climate Zones 2-15
Vapor barriers required on walls in Zones 14 & 16
Vapor barrier required in unvented crawlspaces in all zones
www.builderonline.com
Courtesy of Martyn Dodd @EnergySoft Inc
Title 24, 2013- Envelope
Cool Roofs – Prescriptive• Low-slope ≤2:12 (zones 13, 15)
• Reflectance ≥ 0.63• Emittance ≥ 0.75
OR• SRI ≥ 75
• Steep-slope >2:12 (zones 10-15)• Reflectance ≥ 0.20• Emittance ≥ 0.75
OR• SRI ≥ 16
Coolroofs.org
American Rooftile Coatings
Title 24, 2013- Envelope
Envelope OpportunitiesWindows• Non metal window frames • Thermally improved frames • High performance glazing• Effective placement and sizing of overhangs
and shading devices
Insulation• Advanced assemblies • Non framed assemblies or panelized systems
such as SIPs and ICFs.• HERS verification for insulation installation and
envelope air leakage.
Deltechomes.com
http://www.efficientwindows.org
Title 24, 2013- Envelope
Envelope OpportunitiesRoofs• Roof deck insulation• Raised heel trusses• Specify CRRC rated cool roofs
Buildingscience.com
Title 24, 2013- Solar Zones
Solar Zones - Single family• In subdivisions with 10 or more single residences• Minimum roof area of 250 square feet• 3+ stories and ≤ 2000 sqft, roof area required is
150 sqft
Solar zone:• Roof oriented between 110 degrees and 270 degrees, or flat roof• No roof obstructions• Designed for weight of solar panels• The area might be divided into sections of ≥ 80sqft, with no dimension < 5ft
Solar Zones - Multi family• Minimum 15% of roof area• Located on the roof or overhang of the building or
another structure located within 250 feet of the building or on covered parking installed with the building
2013 Residential Compliance Manual
Courtesy of Martyn Dodd @EnergySoft Inc
Title 24, 2013- Mechanical
HVAC - Mandatory• Duct sealing required in all climate zones
Maximum duct leakage = 6%• Minimum duct insulation = R-6• Return ducts sized per tables
OR • HERS testing for fan power and airflow
HVAC - Prescriptive
New Efficiencies for DX air conditioners will be implemented on Jan 1, 2015Equipment < 65,000 Btuh will require 14 SEEREquipment ≥ 65,000 Btuh <240,000 Btuh = 11.7 EER
• Prescriptive duct insulation = R-8 in climate zones 11, 14-16
• Refrigerant charge test in zones 2, 8-15
Courtesy of Martyn Dodd @EnergySoft Inc
Title 24, 2013- Mechanical
Ventilation - Mandatory• Whole house IAQ fans require HERS testing
and verification• Continuous operation of HVAC fan is not
allowed as IAQ approach
Ventilation - Prescriptive• Prescriptive whole house fan required in zones
8-14• Must be listed in CEC appliance directory• Provides a minimum of 2 cfm/sqft of floor
area
Illustration courtesy of Paul Perreault, BakedMedia
Title 24, 2013- Mechanical
Domestic Hot Water – Mandatory
• Minimum efficiencies & certification• All hot water pipes ≥ ¾” must be insulated• All piping in recirculation loops must be insulated• Gas or Propane water heaters serving individual
units must have• 120V outlet within 3ft• Category III or IV (or B) straight pipe vent• Condensate Drain• Gas supply sized to deliver at least 200,000
Btuh
Courtesy of Martyn Dodd @EnergySoft Inc
Title 24, 2013- Mechanical
Domestic Hot Water – Prescriptive• Demand control on recirculation loops• 8+ dwelling units require a minimum of two
recirculation loops• Systems serving multiple units must have a solar
water heating system with• 20% Net Solar Fraction in zones 1-9• 35% Net Solar Fraction in zones 10-16
• Cannot install electric DHW unless• No natural gas is available
AND• Provide 50% NSF solar system
Title 24, 2013- Envelope
Mechanical OpportunitiesHVAC• Start with a good envelope• Right size your equipment• EER is more important than SEER• Bring ducts out of unconditioned space• Avoid undersized return air paths• Ductless mini-split, heat recovery ventilation,
ground coupled heat pumps, evaporative condensers, combined hydronic systems
Title 24, 2013- Envelope
Mechanical OpportunitiesWater Heating• High efficiency (Condensing) water heaters• Heat Pump water heaters• Combined Hydronic systems• Insulate all pipes• Compact distribution systems• On demand recirculating systems
Title 24, 2013- Lighting
Lighting• All lighting fixture requirements are Mandatory
Measures• Standards only apply to permanently installed
fixtures• A medium screw base is treated as incandescent
Kitchens• 50% of total rated wattage must be high efficacy
Bathrooms• A minimum of one high efficacy luminaire shall be
installed in each bathroomAND
• All other lighting installed shall be high efficacy or controlled by vacancy sensors
Garages, Laundry rooms and Utility rooms• All hard wired lighting must be high efficacy
lightingAND
• Must be controlled by a vacancy sensor
Conservation Law Foundation