Beyond 70%: Measured Results from the Thousand Home Challenge

Transcription

1 Beyond 70%: Measured Results from the Thousand Home Challenge Eric Coffman Affordable Comfort, Inc.

2 Session Learning Objectives: Session Learning Objectives: 1. List four ways that the Thousand Home Challenge is different from other initiatives 2. Describe how the Thousand Home Challenge can complement a Passive House project 3. Identify, in addition to energy efficiency, the other 3 strategies that a project can incorporate 4. Summarize 3 lessons learned from the Thousand Home Challenge experience to date

3 Background! An initiative of ACI (Affordable Comfort, Inc.) an association of professionals primarily focused on growing the Home Performance industry! 2000 attendees! 150+ sessions! CEUs BPI, AIA, NARI, NATE, ASHI, NAHB, RESNET! Trade Show 100+ exhibitors 3

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5 Background! Thousand Home Challenge (THC) was started by ACI s founder Linda Wigington! Pilot Phase systems being refined! Mostly self-funded by ACI! Covers North America (U.S. & Canada)! California focus supported by PG&E! Looking for funding 5

6 Thousand Home Challenge (THC) PURPOSE: To lay the foundation for transforming North American homes by demonstrating the potential for greater than 70% energy reductions in 1,000 existing homes. 6

7 Key Attributes of THC! Demonstrate what is possible! Through case-studies and webinars of deep energy reduction projects! Examples of performance-based design, deployment, verification! Educate and Inspire! Provide resources for educating homeowners, contractors, designers, etc.! Establish aggressive targets for residential energy performance! Encourage getting on-the-path to deep energy reductions! Build Capacity! Highlight local, regional and national expertise! Stimulate collaboration and innovation 7

8 THC Goal! Deep Energy Reduction in a home s total site energy consumption by greater than 70%! Demonstrate actual total energy use for 1 year! Meet or exceed the THC energy target for your house! Two options (A and B) for setting the energy target! Not prescriptive there are variety of paths to deep energy reductions allow solar PV! Combination of technical (building performance) and behavioral solutions! Complimentary to other initiatives like Passive House 8

9 THC Options Compared Option A: Relative Comparison! Must document two full years of energy use! First year as benchmark! Second year must be 75%+ less than first year! Comparison year must be very recent Option B: Algorithmic Target! THC Calculator generates the Option B target! Calculator developed primarily w/michael Blasnik! Six inputs! Not designed for it but works out to 60 80% reduction to average house (Home Energy Yardstick) 9

10 Option B Details! The THC calculator requires six inputs! ZIP Code: Matches up the closest weather station to get number of Heating Degree Days! Number of Occupants: This can be a fraction if some occupants are gone part of the year! Finished Floor Area: Exterior dimensions! Energy Source for Space Heating: This can be split into percentages if there are multiple types! Building Type: Single-family detached versus attached space (i.e. duplex, four-plex)! Number of Households: Taken into account for baseload electric use 10

11 Option B Details! The THC calculator converts all (site) energy use to kwh and analyzes four categories:! Heating: Electric Space Heat OR Gas/Fossil/Wood OR a Blend of the two (designated by %) utilizing floor area and climate data from weather station! Cooling: Cooling degree/dew point hours, also taken from associated weather station! Hot Water: 10 gal/person/day for first two occupants, 7 gal/person/day additional occupants, 100% efficiency, weather data taken into account! Everything Else: An average amount per person PLUS amount per floor area PLUS standard baseload amount 11

12 THC Energy Targets (kwh/year) by Region, House Size, Occupancy GOAL: Challenging but fair across a range of climates 12

13 Typical THC Process Overview Apply for THC Participate in our Introductory Webinar Fill out application including your commitment to vision, actions & process Establish Energy Use Target Choose Option A or Option B and determine your one-year energy use target submit proof for Option A Plan Your Deep Reduction Project Utilize the many THC resources planning guides, webinars, case studies, and assemble a project team Demonstrate Actual Energy Use for 1 year Required to submit utility bills documenting 1 full year 13

14 THC Application 14

15 Learning Objective 1! List four ways that the Thousand Home Challenge is different from other initiatives: 1. Aggressive Target: Deep Reduction is a defined target but is also customized for every house 2. Actual Energy Use: Must document a full year (or more) 3. Not prescriptive: There are many different approaches and solutions 4. Technology and Behavior: Blends both technology solutions and human behavior solutions 15

16 Current Status of THC! We re still in the Pilot Stage long way from getting to 1,000 homes! ACTIVE Projects Projects OFFICIALLY MEET THC Projects are CANDIDATES Projects meet their target but application / documentation is incomplete 16

17 Let s take a look at some PROJECTS Start with Passive House inspired projects 17

18 Lutz Project! CLIMATE: Ohio 5400 HDD! SIZE: 576 sf 1 occupant! HEATING: Electric Ductless Mini-split Heat Pump! ALLOWANCE: Option B 2043 kwh/year! ACTUAL: Net Energy Use -881 kwh/year! Superinsulated 6 sides, R-40 exterior foam walls! Pretty tight (2.64 ACH50)! ERV! HP Water Heater! ~$25k on remodel! 3.5 kw PV! THC Case Study 18

19 Eagle Bluff Project! CLIMATE: Minnesota 7641 HDD! SIZE: 1522 sf 2 occupants! HEATING: Blend Natural Gas/Electricity! ALLOWANCE: Option A kwh/year (B: 7304 kwh/year)! ACTUAL: Net Energy Use kwh/year (78% reduction)! Exterior rigid foam 6-sided! Sustainability goals! Eco-learning Center! Solar Thermal! 5.6 kw PV 19

20 O Neill Project! CLIMATE: California 3107 HDD! SIZE: 2342 sf 1 occupant! HEATING: Electric! ALLOWANCE: Option B 5056 kwh/year! ACTUAL: Net Energy Use 5765 kwh/year NOT QUITE! MODELED PREDICTION: 3634 kwh/year (no PV)! Official Passive House Retrofit 0.38 ACH50! Hot Water system performance issues! Excessive lighting! 2.15 kw PV! THC Webinar 20

21 O Neill Project! Listen to our Webinar about the O Neill Passive House Retrofit in Sonoma, CA! Graham Irwin (Consultant) and Rick Milburn (Builder)! Don Fugler and Gary Klein (Webinar Commentators) thousandhomechallenge.com/spring-2012-webinar3 21

22 Learning Objective 2! Describe how the Thousand Home Challenge can complement a Passive House project! Engage the occupants to monitor energy usage! Discover and fix system performance issues! Encourage occupant behavior modification! Create awareness for Passive House / connect homeowners with expertise 22

23 Let s take a look at some PROJECTS Other Deep Retrofits 23

24 Scale Project! CLIMATE: Ontario 7371 HDD! SIZE: 3131 sf 1.9 occupants! HEATING: Blend Wood-Propane-Electric! ALLOWANCE: Option B kwh/year! ACTUAL: Net Energy Use kwh/year! Significant thermal enclosure improvements exterior foam, insulated slab! Converted Schoolhouse! Passive Solar! Masonry Heater! HRV! No PV! THC Case Study 24

25 Brownsberger Project! CLIMATE: Massachusetts 5727 HDD! SIZE: 4092 sf 5.25 occupants (two-family)! HEATING: Natural Gas! ALLOWANCE: Option B kwh/year! ACTUAL: Net Energy Use kwh/year! Total gut remodel exterior foam + cellulose in walls! New windows! ERV! E-monitor! Solar Thermal! 5.6? kwh PV! HERS: 197 to 32! THC Case Study 25

26 Ross Project! CLIMATE: Massachusetts 6278 HDD! SIZE: 3245 sf 4 occupants! HEATING: Electric Mini-split Heat Pump (two heads)! ALLOWANCE: Option B 9026 kwh/year! ACTUAL: Net Energy Use kwh/year! Total gut remodel exterior insulation! Heat pump water heater! Multi-head mini-split! HRV! 12.2 kw PV! THC Case Study 26

27 Hall Project! CLIMATE: Massachusetts 5727 HDD! SIZE: 3650 sf 5 occupants! HEATING: Blend Natural Gas/Electricity! ALLOWANCE: Option B 9668 kwh/year! ACTUAL: Net Energy Use 8879 kwh/year! Major remodel exterior rigid foam on walls/roof! Triple-pane windows! Hydronic/combi! HRV! Solar Thermal! 6.25 kw PV! BSC Case Study 27

28 Let s take a look at some PROJECTS Pretty Good Retrofit + Solar PV 28

29 Shea Project! CLIMATE: New York 6542 HDD! SIZE: 3005 sf 3.14 occupants! HEATING: Electric Geothermal Heat Pump! ALLOWANCE: Option B 8063 kwh/year! ACTUAL: Net Energy Use kwh/year! Fuel switch from gas to heat pump! Replaced half the windows! Cellulose in walls! Fiberglass in attic! 10 kw PV 29

30 Glass-Kyes Project! CLIMATE: California 2791 HDD! SIZE: 3131 sf 3 occupants! HEATING: Electric Heat Pump! ALLOWANCE: Option B 6629 kwh/year! ACTUAL: Net Energy Use 5218 kwh/year! Gas to electric conversion! Crawlspace insulation! Attic insulation! New windows! HP water heater! 6 kw PV 30

31 Mackey Project! CLIMATE: Pennsylvania 5343 HDD! SIZE: 2500 sf 2 occupants! HEATING: Electric 2 Ductless Mini-splits! ALLOWANCE: Option B 6488 kwh/year! ACTUAL: Net Energy Use 2696 kwh/year! Hail storm insurance money paid for exterior rigid foam! Loss of large tree in south-facing backyard! More attic insulation! Triple-pane windows! Solar Thermal! 7.4 kw PV! THC Case Study 31

32 Let s take a look at some PROJECTS Occupant Behavior 32

33 Stratton-Lee Project! CLIMATE: California 2726 HDD! SIZE: 667 sf 2 occupants! HEATING: Natural Gas! ALLOWANCE: Option B 3858 kwh/year! ACTUAL: Net Energy Use 3590 kwh/year! Highly motivated simple lifestyle! Renters 1 bedroom! Plastic on windows! No PV! THC Short Case Study 33

34 Beeler Project! CLIMATE: California 2791 HDD! SIZE: 2500 sf 2 occupants! HEATING: Natural Gas! ALLOWANCE: Option B 6231 kwh/year! ACTUAL: Net Energy Use 4675 kwh/year! Cellulose in walls! T-stat setting! Cocoon strategy! Solar Thermal! 2.5 kw PV! THC Webinar 34

35 Learning Objective 3! Four Strategies that a project can incorporate to achieve the Thousand Home Challenge 1. Efficiency: Upgrades to the building and equipment 2. Renewables: Solar can be a game-changer 3. Behavioral Choices: Thermostat setting, clothesline, powerstrips, etc. 4. Community Solutions: Laundromat, shower at the gym, internet at the library 35

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40 Let s take a look at some PROJECTS Newer Homes 40

41 Bergamaschi-Soo Hoo Project! CLIMATE: California 2726 HDD! SIZE: 3153 sf 3 occupants! HEATING: Natural Gas! ALLOWANCE: Option B 7170 kwh/year! ACTUAL: Net Energy Use 4316 kwh/year! Newer home owner wanted to add PV! Electric baseload sleuthing! T-stat setting! Tankless water heater! 3.3 kw PV! THC Webinar 41

42 Weingarten Project! CLIMATE: California 2767 HDD! SIZE: 1800 sf 2 occupants! HEATING: Blended wood, propane! ALLOWANCE: Option B 5276 kwh/year! ACTUAL: Net Energy Use 3207 kwh/year! Newer house built w/sips! Issues w/propane met the THC by replacing propane fridge with electric! Completely off-grid! 0.66 kw PV 42

43 Learning Objective 4! Summarize three lessons learned from the Thousand Home Challenge experience to date 1. Different paths to deep reductions: A wide variety of approaches Deep Energy Retrofit is only one way to get there 2. Measured results: A customized THC energy target motivates and engages homeowners 3. Game changers: Cost of PV, performance of mini-split heat pumps and heat pump water heaters 43

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