California Advanced Homes Program 2019 Residential Code Changes

Transcription

1 California Advanced Homes Program 2019 Residential Code Changes March 21, 2017

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3 Sponsored by PG&E These programs are funded by California utility customers and administered by PG&E under the auspices of the California Public Utilities Commission. PG&E refers to Pacific Gas and Electric Company, a subsidiary of PG&E Corporation Pacific Gas and Electric Company. All rights reserved. 3

4 Program Overview California Advanced Homes Program (CAHP) Single family new construction in PG&E, So Cal Gas, and SDG&E territory Facilitates energy efficient design and construction through incentives and design assistance Supports builders, energy consultants, and HERS raters to move beyond the current energy code Program is funded under the auspices of the CPUC Incentive levels and program requirements may be revised during the program cycle 4

5 Program Requirements Homes must meet the following requirements: Permit to 2016 Title 24 standards Receive PG&E service Be new construction Be single family or a duplex Meet energy performance requirements Energy consultants must: Hold either a 2013 or a 2016 residential Certified Energy Analysist (CEA) certificate 5

6 Agenda 1. Context for Code Change Energy Code

7 1. Context of code change History of code Issues and Challenges Understand your climate zone Zero Net Energy Goals & Challenges

8 How it All Started Warren-Alquist Act 1975 Established the California Energy Commission (CEC) What was happening in 1975? Watergate (1974) 10% inflation OPEC gas shortages 55 mph imposed to save gas Global recession Vietnam War ended Rosenfeld Curve: Per Capita Electricity Consumption in California and the U.S. 8

9 Between 1975 and Today Impact of building standards on home energy use 9

10 1. Context of code change History of code Issues and Challenges Understand your climate zone Zero Net Energy Goals & Challenges

11 Renewables are NOT the Answer Winter Storm 1/10/17 Lots of rain, wind, clouds 12

12 Renewables are NOT the Answer Spring 3/19/17 Mostly cloudy 13

13 Renewables are NOT the Answer Winter Storm 1/10/17 14

14 Renewables are NOT the Answer Spring 3/19/

15 Load Flattening The Duck Curve Ideal Flat Load The Duck s neck- a sudden increase in required energy. Requires peaking plants, add brownout risk 16

16 Renewable Energy Breakdown 17

17 Changes to TDV Zero Net Energy Policy and other impacts Large scale PV deployment on the grid Resulting from 50% RPS (Renewable Portfolio Standard) Lowers the value of additional electricity around midday, coincident with utility solar production Greener electric grid in the future Rooftop PVs will have diminished carbon reduction benefits 18

18 Changes to TDV 19

19 1. Context of code change History of code Issues and Challenges Understand your climate zone Zero Net Energy Goals & Challenges

20 Understand your Climate Zone 21

21 Understand your Climate Zone Total TDV use by climate zone 2016 code home22

22 1. Context of code change History of code Issues and Challenges Understand your climate zone Zero Net Energy Goals & Challenges

23 ZNE changing definition was big to audience so may want to spend more time focusing on it 24

24 One Zero Net Energy Goal Many Definitions Produce as much energy as the home uses on an annual (net) basis Gas vs. Electric? Site vs. Source? Cost of energy? Peak energy reduction? 0 Net Source Energy 0 Net Energy Costs 0 Net Site 0 Energy Net Energy Emissions 0 0 Net kwh kwh Energy California Code ZNE Definition Net TDV Energy 25

25 2019 ZNe Definition the value of the net amount of energy produced by on-site renewable energy resources is equal to the value of the energy electricity consumed annually by the building, at the level of a single project. using the California Energy Commission s Time Dependent Valuation metric. 26

26 ZNE Goals Lessons Learned Grid is treated as virtual storage Very little capability to store and use over-generated kwhs from PVs Electrification of homes must be coupled with grid harmonization strategies Customer-owned storage still very expensive 27

27 The ZNE Challenge: Grid Harmonization 28

28 Grid Harmonization Efficiency TDV is all about the peak and focuses efficiency at the peak (code addresses TDV peak) Limited effectiveness at this point Storage Battery Distributed Community based Demand Response Temporary solution to a permanent problem Renewable Energy 29

29 Efficiency 30

30 31 Storage

31 32 Storage

32 33 Storage

33 Demand Response 34

34 Demand Response 35

35 2019 Standards ZNE Goals Achieve full ZNE by encouraging: Envelope Efficiency Appropriately sized PVs Grid Harmonization & EV integration strategies to maximize selfutilization of PV output and limit grid exports Competition, innovation and flexibility to foster new solutions 36

36 Energy Code Building standards overview Major changes to 2016 code High Performance Walls (HPW) High Performance Attics (HPA) High Performance Windows (HPF) Target Energy Design Rating (EDR)

37 Building Energy Efficiency Standards Efficiency increases, cycle over cycle ~15% ~14% ~30% ~28% ~15% Requirements for newly constructed buildings, and additions/alterations Energy efficiency Water efficiency Indoor air quality 38

38 Building Energy Efficiency Standards Standards are divided into 3 parts Mandatory requirements Absolute bare minimum Prescriptive packages Recipe or checklist for compliance Performance standards The energy budget for the building is created here using approximately the same building but built prescriptively at the same location 39

39 Energy Code Building standards overview Major changes to 2016 code High Performance Walls (HPW) High Performance Attics (HPA) High Performance Windows (HPF) Target Energy Design Rating (EDR)

40 High Performance Walls Major changes in the 2019 code Residential Prescriptive Standard- Assembly U factor CZ U-Factor R (23.3) U-Factor R (19.6) U-Factor R (15.4) WALLS ATTICS WINDOWS TARGET EDR 41

41 High Performance Walls Wall Assembly U Factor Breakdown Material R Value Inside Air Film Gypsum Board Fiberglass Batt Plywood Rigid Insulation 2.0 Vinyl Sliding 0.61 Outside Air Film 0.17 Cumulative R Value U Factor 1/R 1/15.53 = Btu/hr ft 2 F WALLS ATTICS WINDOWS TARGET EDR 42

42 Continuous Insulation Options WALLS ATTICS WINDOWS TARGET EDR 43

43 Common Wall Framing Options U-FACTOR FRAMING STUD SPACING CAVITY INSULATION EXTERIOR INSULATION x6 16 OC R-21 R x4 16 OC R-13 R x6 24 OC R-19 R-8 CAVITY INSULATION TYPE High density fiberglass batt Low density fiberglass batt Low density fiberglass batt x4 16 OC R-15 R-8 (~2") High density batt x6 16 OC R-21 R-4 (~1") High density batt or BIB Multiple combinations of similar materials will achieve these same U-factors. WALLS ATTICS WINDOWS TARGET EDR 44

44 U-factors of Wood Framed Walls (Table 4.3.1) WALLS ATTICS WINDOWS TARGET EDR 45

45 Alternate Wall Systems STRUCTURALLY INSULATED PANELS (SIPS) INSULATED CONCRETE FORMS (ICFs) Impacts Minimal thermal bridging Factory fabricated Lower labor costs, but high delivery costs Seismic durability WALLS ATTICS WINDOWS TARGET EDR 46

46 Energy Code Building standards overview Major changes to 2016 code High Performance Walls (HPW) High Performance Attics (HPA) High Performance Windows (HPF) Target Energy Design Rating (EDR)

47 High Performance Attics Major changes in the 2019 code 2013 Code Vented, Ceiling Insulated NO Roof Insulation 2016 Code Vented, Ceiling Insulated R-13 Roof Insulation 2019 Code Vented, Ceiling Insulated R-19 Roof Insulation Represents HPA-B (batt) WALLS ATTICS WINDOWS TARGET EDR 48

48 Prescriptive options for HPA High Performance Attics Option A : Ducts & air handler located in the attic with insulation above roof rafters and at the ceiling level Option B : Ducts and air handler located in the attic with insulation below roof deck and at the ceiling level Option C: Ducts and air handler unit located in conditioned space CZ * 12 13* 14 15* 16 Option A R-6 R-6 R-7 R-6 R-7 R-7 R-7 R-7 R-7 R-7 Option B (Box net) Option B (Batt) R-13 R-13 R-16 R-13 R-16 R-16 R-16 R-16 R-16 R-16 R-13 R-13 R-19 R-13 R-19 R-19 R-19 R-19 R-19 R-19 WALLS ATTICS WINDOWS TARGET EDR 49

49 Add slide on box netting 50

50 Energy Code Building standards overview Major changes to 2016 code High Performance Walls (HPW) High Performance Attics (HPA) High Performance Windows (HPF) Target Energy Design Rating (EDR)

51 Major Changes in the 2019 code High Performance Windows Specs U FACTOR SHGC WALLS ATTICS WINDOWS TARGET EDR 52

52 High Performance Windows Major Changes in the 2019 code Percentage of Heat Loss CZ Windows 11 38% 12 43% 13 39% 15 37% 16 19% WALLS ATTICS WINDOWS TARGET EDR 53

53 High Performance Envelope Package Percent savings of regulated loads for 2019 package: High Performance Walls (HPW) 2-4% High Performance Attics (HPA) 1-3% High Performance Windows (HPF) 2-4% Percent Savings of Regulated Loads CZ 2019 HPW 2019 HPA 2019 HPF % 2.3% 3% % 2.8% 3.7% % 2.6% 3.0% % 2.3% 2.7% % 1.7% 1.9% WALLS ATTICS WINDOWS TARGET EDR 54

54 Quality Insulation Installation (QII) Increased percent savings of regulated loads by including QII with 2019 Package (HPW + HPA + HPF) Percent Savings of Regulated Loads CZ 2019 Package without QII 2019 Package with QII % 15.4% % 18.1% % 15.2% % 12.7% % 14.0% WALLS ATTICS WINDOWS TARGET EDR 55

55 PV Compliance Credit Requirements Performance approach Climate zones 1-5 or 8-16 Minimum amount of PV Compliance credit depends upon Climate zone Conditioned Floor Area As much credit as the HPW and HPA PV credit available even if project includes HPW and HPA Not applicable for 2019 Code WALLS ATTICS WINDOWS TARGET EDR 56

56 Energy Code Building standards overview Major changes to 2016 code High Performance Walls (HPW) High Performance Attics (HPA) High Performance Windows (HPF) Target Energy Design Rating (EDR)

57 Energy Design Rating 1. Standard Design EDR: EDR of the building using the prescriptive requirements 2. Proposed Design EDR EDR as designed with performance tradeoffs (without PV) 3. Proposed PV EDR EDR for the solar PV system by itself 4. Final Proposed EDR Final EDR for home as designed, taking solar PV (if installed) into account 5. CAHP EDR: Used for program eligibility/base incentive level WALLS ATTICS WINDOWS TARGET EDR 58

58 Target EDR Code Compliance Requirements: Proposed Design EDR Standard Design EDR AND Final Proposed EDR Target EDR Final Proposed is a combination of EE and Generation (PV typically) TARGET EDR Design EDR PV &/or EE WALLS ATTICS WINDOWS TARGET EDR 59

59 Target EDR Example WALLS ATTICS WINDOWS TARGET EDR 61

60 Climate Zone Efficiency EDR without PV, based on 2019 Efficiency Measures Target EDR Example Target Design Rating Score for Displacing kwh Elect with PV kw PV Size for Displacing kwh Electric Only WALLS ATTICS WINDOWS TARGET EDR 62

61 1. Establishes a performance benchmark 2. Industry appreciates options available Advantages of Target EDR 3. Sends the right signals about EE, PV sizing, demand response and flexibility 4. Allows builder to use more efficiency and less PV 5. Provides credit for demand response and flexibility, storage, EV integration, and grid harmonization strategies to achieve ZNE 6. Works well with varying building sizes static PV size does not WALLS ATTICS WINDOWS TARGET EDR 63

62 Questions 64

63 Energy Code Ace For information on the residential and nonresidential codes visit Energy Code Ace at 65

64 We re here to help builders today for tomorrow s environment. Scott Blunk Associate Director of Building Science sblunk@trcsolutions.com 66