Are You Ready for Solar-Ready? And Other Energy Code Updates (Residential)

Transcription

1 Are You Ready for Solar-Ready? And Other Energy Code Updates (Residential) January 18, 2018 Massachusetts Energy Code Technical Support Program 1 Who Is Mass Save? Mass Save is an initiative sponsored by Massachusetts gas and electric utilities and energy efficiency service providers, including -The Berkshire Gas Company -Cape Light Compact -Columbia Gas of Massachusetts -Eversource Energy -Liberty Utilities -National Grid -Unitil The Sponsors of Mass Save work closely with the Massachusetts Department of Energy Resources to provide a wide range of services, incentives, trainings, and information promoting energy efficiency that help residents and businesses manage energy use and related costs. 2 1

2 Presented by: Performance Systems Development Rakesh Koti, Energy Code Specialist 3 PSD Overview Deliver Support Empower Programs RNC/CNC Codes Whole Building Professional Services Training Energy Engineering Rater Providership Software Program Management Field Tools Applications 4 2

3 ACEEE State Energy Efficiency Scorecard Agenda Introduction 9 th Edition Changes Residential Solar-ready provisions Significant changes from IECC 2012 to IECC 2015 with MA amendments Major changes impacting energy efficiency (With reference to 2015 IECC Determination of Energy Savings by PNNL ERI compliance path and alternative energy performance rating methods Changes to 9th Edition Stretch Code Summary Questions 6 3

4 Concurrency Period = Concurrency period IECC 2015 IECC 2012 IECC to July 2014 Jan MA 7 th Edition July to Jan MA 8 th Edition Aug 12 th 2016 Jan 1 st 2017 Oct 20 th 2017 Jan 1 st 2018 MA 9 th Edition July 1 st 2010 Stretch Code New Stretch Code 8 9 th Edition Concurrency & Changes Concurrency end Jan 1 st Solar-ready roof-tops is the only change from 8 th Edition to 9 th Edition with respect to Residential Energy 9 4

5 Appendix U: Solar-Ready Provisions 2015 IECC Appendix RB SOLAR-READY PROVISIONS - DETACHED ONE- AND TWOFAMILY DWELLINGS, MULTIPLE SINGLE-FAMILY DWELLINGS Adopted by MA and replaced by Appendix U in 780 CMR 10 Appendix U: Solar-Ready Provisions General AU General These provisions shall be applicable for new construction, except additions. AU102 GENERAL DEFINITIONS SOLAR-READY ZONE: A section or sections of the roof or building overhang designated and reserved for the future installation of a solar photovoltaic or solar thermal system. 11 5

6 Appendix U: Solar-Ready Provisions Scope AU103.2 General: Applies to new detached one-and two-family dwelling units and townhouses with: Not less than 600 sqft. of roof area Oriented between 110 to 270 degrees of true north 12 Appendix U: Solar-Ready Provisions Scope Roof orientation not within 110 to 270 degrees This roof should be solar-ready North oriented roof South oriented roof should be solarready Both roofs can be used to satisfy the solarready requirement 13 6

7 Appendix U: Solar-Ready Provisions Exceptions Exception 1: Buildings with permanently installed on-site renewable energy systems Exception 2: Solar-ready zone shaded for more than 70% of daylight hours Exception 3: Shown in construction docs to be outside of scope 14 Appendix U: Solar-Ready Provisions AU Construction Documentation Solar panel layout or solar-ready zone indicated on plans Solar panel layout 15 7

8 Appendix U: Solar-Ready Provisions AU Solar-ready zone area The solar-ready zone shall not be less than 300 sqft. Or If the house is A townhouse three stories or less, and Total floor area less than 2000 sq.ft The solar ready zone shall not be less than 150 sqft. These areas are exclusive of mandatory access or set-back areas as required by 527 CMR (fire safety code) 16 Appendix U: Solar-Ready Provisions AU Solar-ready zone area The solar-ready zone areas shall be composed of: Areas not less than 80 square feet At least 5 ft. wide 80 sq.ft. area 17 8

9 Appendix U: Solar-Ready Provisions AU Obstructions The solar-ready zone should not be obstructed, including but not limited to: Vents Chimneys Roof-mounted AU Roof Load Documentation The structural design loads for live and dead loads should be clearly indicated on construction documentation 18 Appendix U: Solar-Ready Provisions AU Interconnection Pathway Construction drawings should indicate: Electrical conduit pathway from the solarready zone to the electrical panel (PV) Or Plumbing pathway from the solar-ready zone to the service hot water system (solar thermal) 19 9

10 Appendix U: Solar-Ready Provisions AU Electrical Service Reserved Space The main electrical service panel shall have a reserved space to allow installation of a dual pole circuit breaker for future solar installation It shall be labeled For Future Solar Electric Space for Dual pole circuit breaker to be located at the opposite end and labeled Input Feeder/Main 20 Reference: Appendix U: Solar-Ready Provisions AU Construction Documentation Certificate A permanent certificate, indicating solar-ready zone and other requirements of this section shall be posted at a conspicuous location (electrical distribution panel, water heater, etc.) by the builder/registered design professional 21 10

11 Poll Question #1 Which of the following are true of Solar-ready zones? 1. Solar-ready zone is required for detached one/two family dwelling units greater than 600 sq.ftand oriented between true north 2. Buildings with permanently installed renewable energy systems are exempt from solar-ready provisions 3. None of the above 4. (a) & (b) 4. (a) & (b) 22 Poll Question #2 Which of the following must be included in construction documentation? 1. Structural design loads (live loads and dead loads) from future solar PV 2. The conduit/connection from the solar panels to the main feeder 3. Orientation and tilt of solar panels with respect to the roof 4. (a) & (b) 4. (a) & (b) 23 11

12 Poll Question #3 In the drawing, which roof should be solar-ready? 1. North-oriented roof 2. South-oriented roof 3. None 1. South-oriented roof North oriented roof South oriented roof 24 Significant changes between 2012 IECC and 2015 IECC MAJOR CHANGES AFFECTING ENERGY EFFICIENCY 25 12

13 Significant changes between 2012 IECC and 2015 IECC Webpage: /sites/default/files/documents /2015_IECC_preliminaryDeter minationanalysis.pdf 26 Ducts R Duct insulation 2012 IECC Location of ducts R-value of duct insulation Supply ducts in attics R 8 All other ducts elsewhere R IECC Location of ducts Supply and Returnducts in attic Supply and Return ducts elsewhere R-value of duct insulation R-8 when 3 inch diameter R-6 when 3 inch diameter R-6 when 3 inch diameter R-4.2 when 3 inch diameter No duct insulation required in conditioned space

14 Ducts R Duct leakage (Amended) Prescriptive leakage rates are unchanged New distinction between Mandatory vs. Prescriptive Leakage testing is mandatoryregardless of compliance path Leakage limits(below) only apply to prescriptive path Location of ducts Rough-in test total duct leakage 2012 IECC & 2015 IECC R-value of duct insulation 4 cfm/100 sf when air handler installed 3 cfm/100 sf when air handler not installed Postconstruction test Total leakage less than or equal to 4 cfm/100 sf N : Testing and verification of ducts to be done by HERS Rater, HERS Field Inspector or BPI Certified Professional 28 Pipe Insulation R Hot water pipe insulation (Prescriptive) IECC 2012 R-3 required for hot water piping larger than ¾ inch nominal diameter R-3 for piping from water heater to kitchen outlets IECC 2015 R-3 required for hot water piping ¾ inch nominal diameter and larger R-3 for piping from water heater to kitchen outlets Decreases energy efficiency Increases energy efficiency ¾ inch is the most common size for long trunk lines in typical residences, this change is likely to improve efficiency as a whole. 29 Reference: 14

15 Mechanical Ventilation R403.6 Mechanical Ventilation (Replaced by MA Code Amendment - Mandatory) Each dwelling unit of a residential building shall be provided with continuously operating exhaust, supply or balanced ventilation that meets the requirements of: Energy Star Homes Version 3.1 ASHRAE ; or Per formula Minimum cfm required Conditioned floor area Number of bedrooms Blower door test result Building height factor Weather & shielding factor N : Testing and verification of mechanical ventilation system to be done by 30 HERS Rater, HERS Field Inspector or BPI Certified Professional Mechanical Ventilation R403.6 Mechanical Ventilation (Replaced by MA Code Amendment - Mandatory) Stories above grade plane Building Height Factor Table S Weather Shield Factor County Barnstable 0.60 Berkshire 0.52 Bristol 0.54 Dukes 0.59 WSF 31 15

16 R Verification(Code Amendment) The performance of the installed mechanical ventilation system shall be tested and verified by HERS Rater, or ( HERS Rating Field Inspector, or BPI Certified Professional R Air moving Equipment Selection and Installation(Code Amendment) Equipment should be tested and verified by AMCA (Air Movement and Control Association or HVI (Home Ventilating institute). 32 Poll Question #4 Duct leakage testing and mechanical ventilation systems testing must be done by (multiple choice): 1. BPI certified professional 2. HERS Rater/HERS Rating Field Inspector 3. Can be done by anyone as long as a valid certificate is issued and posted at a conspicuous location 1. & 2. Testing can be done by BPI certified professional, HERS Rater or HERS Rating Field Inspector 33 16

17 Significant changes between 2012 IECC and 2015 IECC ERI Compliance Path and Alternative Energy Performance Rating Methods 34 Section R401.2 Compliance (Amended) Compliance Paths Prescriptive with MA Amendments Sections N through N1104 Simulated Performance Alternative with Mandatory Provision Sections N1105 & Mandatory provisions Energy Rating Index or Alternate Compliance Paths Sections N

18 Section R401.2 Compliance (Amended) ERI and Alternative Energy Performance Rating Paths Certified RESNET HERS Rating with MA Amendments Certified Energy Star Homes Version 3.1 Certified Passivehaus Performance method 36 Energy Performance Index/HERS Index Table R (N ): Maximum HERS index scores with onsite renewable energy systems Renewable Energy Source New Construction Maximum HERS Index Whole House Renovations; Additions None Solar PV > 2.5 kw, or Renewable primary heating system Solar PV + Solar thermal DHW, or Renewable primary heating + solar thermal DHW Solar PV + Renewable primary heating + solar thermal DHW Section N1106.4: The building should have a HERS score less than the score listed in the table prior to credit for onsite renewable electric generation

19 Energy Performance Index/HERS Index Table R (N ): Maximum HERS index scores with onsite renewable energy systems Renewable Energy Source New Construction Maximum HERS Index Whole House Renovations; Additions None Solar PV > 2.5 kw, or Renewable primary heating system Solar PV + Solar thermal DHW, or Renewable primary heating + solar thermal DHW Solar PV + Renewable primary heating + solar thermal DHW Energy Performance Index/HERS Index Table R (N ): Maximum HERS index scores with onsite renewable energy systems Renewable Energy Source New Construction Maximum HERS Index Whole House Renovations; Additions None HERS score should not exceed 55 for New Construction Section N :Post-construction or rough-in testing and verification shall be done by HERS Rater HERS Rating Field Inspector BPI Certified Professional 39 19

20 Energy Performance Index/HERS Index Table R (N ): Maximum HERS index scores with onsite renewable energy systems Renewable Energy Source New Construction Maximum HERS Index Whole House Renovations; Additions None Solar PV > 2.5 kw, or Renewable primary heating system Solar PV + Solar thermal DHW, or Renewable primary heating + solar thermal DHW Solar PV + Renewable primary heating + solar thermal DHW Energy Performance Index/HERS Index Renewable Primary Heating: 1. Clean Biomass heating System 2. Solar thermal array 3. Ground Source Heat Pump 4. Or a combination of all the above These systems offset 5 HERS points Wood-pellet fired central boilers with a thermal efficiency of at least 80% 41 Reference: 20

21 Energy Performance Index/HERS Index Table R (N ): Maximum HERS index scores with onsite renewable energy systems Renewable Energy Source New Construction Maximum HERS Index Whole House Renovations; Additions None Solar PV > 2.5 kw, or Renewable primary heating system Solar PV + Solar thermal DHW, or Renewable primary heating + solar thermal DHW Solar PV + Renewable primary heating + solar thermal DHW Energy Performance Index/HERS Index Table R (N ): Maximum HERS index scores with onsite renewable energy systems Renewable Energy Source New Construction Maximum HERS Index Whole House Renovations; Additions None Solar PV > 2.5 kw, or Renewable primary heating system (Solar PV + Solar thermal DHW), or (Renewable primary heating + solar thermal DHW) Solar PV + Renewable primary heating + solar thermal DHW

22 Energy Performance Index/HERS Index Two points are offset for Solar thermal array for DHW Clean Biomass Stove Wood or pellet-fired stoves that are EPA certified Reference: Energy Performance Index/HERS Index Table R (N ): Maximum HERS index scores with onsite renewable energy systems Renewable Energy Source New Construction Maximum HERS Index Whole House Renovations; Additions None Solar PV > 2.5 kw, or Renewable primary heating system (Solar PV + Solar thermal DHW) or (Renewable primary heating + solar thermal DHW) Solar PV + Renewable primary heating + solar thermal DHW

23 Energy Performance Index/HERS Index Solar Photovoltaic 2.5 kw Clean Biomass Heating system Ground Source heat Pumps Solar thermal array for Domestic Water Heating Clean Biomass Stove Each can offset 5 HERS points Each can offset 2 HERS points Exception: Clean Biomass stove offset cannot be combined with Clean Biomass primary heating system offset. 46 Energy Performance index/hers Index Table R (N ): Maximum HERS index scores with onsite renewable energy systems Renewable Energy Source New Construction Maximum HERS Index Whole House Renovations; Additions None Solar PV > 2.5 kw, or Renewable primary heating system (Solar PV + Solar thermal DHW), or (Renewable primary heating + solar thermal DHW) (Solar PV + Renewable primary heating + solar thermal DHW)

24 Poll Question #5 A house has 3 kw of PV and a clean biomass stove. What is the maximum HERS score that the house can get? Five points for Solar PV and two points for biomass stove ( ) 48 Poll Question #6 In the previous question, the HERS rating should be achieved 1. Prior to credit for on-site renewable energy 2. After including renewable energy systems in the HERS rating software 1. Prior to credit for on-site renewable energy 49 24

25 9th Edition Stretch Code Appendix AA Stretch Energy Code 50 9th Edition Stretch Code Simplified for 9 th Edition 8 th Edition Stretch Code requirements 9 th Edition Stretch Code for New Construction for New Construction (3 stories or less) (4 stories or less) Dwelling unit size (CFA) Maximum HERS score Units 3000 sq.ft. 65 Maximum HERS Score of 55 for New Construction (can be higher if renewables are installed) Passive House Institute US (PHIUS) Approved Software Units < 3000 sq.ft. 70 ENERGY STAR Homes 3.1 Path Should also comply with Energy Star Thermal Bypass Inspection Checklist Should also comply with Mandatory Air leakage requirements of IECC 2015 and Table R (Air Barrier and Insulation Installation) 51 25

26 Poll Question #7 Which of the following is not a valid compliance path for homes in Stretch Code Communities? 1. Energy Star Homes Version PHIUS or PHI 3. HERS Index / ERI Path 4. Prescriptive requirements of IECC with MA Amendments 4. Prescriptive path is not a valid compliance option for Stretch Code Communities 52 Energy Code Support Questions about the energy code? Energy Code Support Hotline: Energy Code Support energycodesma@psdconsulting.com 53 26

27 Thanks! Massachusetts Energy Code Technical Support Program 54 27