1. Heat Pump Water Heaters: Tier 2 – Ducted Interior Installations Provisional UES Proposal Regional Technical Forum February 14 th, 2012

2. Background In October 2011, Provisional UES approved for heat pump water heater (HPWH) for:October 2011 – Northern Climate Specification Tier 1 Buffer space installs Interior (non-ducted installs) – Northern Climate Spec Tier 2 Buffer space installs Northern Climate Spec Tier 2 Interior Installations require exhaust ducting – Left as “TBD” in October – Presented preliminary analysis in December 2011December 2011 2

3. Measure Summary Measure name: Heat Pump Water Heater Measure description – Installation of a heat pump water heater instead of a standard electric tank water heater in single family site built homes in an interior location with exhaust ducts – Installation shall comply with the Northern Climate Heat Pump Specification for Tier 2 units with exhaust ducting Measure spec under development Measure type: UES Today’s Request: Discussion, Review, Decision Change in measure status: Proposed  Provisional Change in measure savings: n/a Change in measure cost effectiveness: n/a 3

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9. Tier 2: Field Installs Current NEEA field study specifies interior installs with exhaust ducting limit airflow to 200 cfm Example from one site (1/27/12): – airflow measurements with 12-point duct traverse 9 Duct Run FittingDiameter (in.)Length (in.) 1Start6"0” 2Straight Duct6"12” 3 6" to 4" Reducer with damper 6"8” 4Straight Duct4"10” 5Exhaust4" 0” Airflow Measurements TraverseDuct SizeCFM A 4” Damper Full Open 234 B A 4” Damper Adjusted 206 B

10. Measured Airflow Variation Effects: ATI NEEA lab testing of ATI at 67.5F ambient – 375 cfm:full flow, capacity and COP – 200 cfm:5% capacity and 10% COP reduction – 150 cfm:11% capacity and 12% COP reduction 10

11. Measured Airflow Variation Effects: Voltex BPA HPWH lab evaluation observed Voltex compressor performance for 3 flow scenarios at 67.5F ambient temperature – Full flow: 475 cfm – ⅓ filter area blocked: 372 cfm – ⅔ filter area blocked: 284 cfm  Similar, small changes in performance as found with ATI but flow down to 200cfm not tested 11

12. Overall Savings Estimates Impact on house heating + cooling system depends on climate, exhaust airflow, and HVAC system type Combining DHW energy savings with heating + cooling impact produces the overall energy savings estimate 5 scenarios in 4 climates considered on next slide: – Interior non-ducted (0 cfm flow to outside) – 4 levels of exhaust ducting to outside 150, 200, 250, and 300 cfm 12

13. Zonal Resistance Heat (kWh/yr)Electric Resistance Furnace (kWh/yr) CFMPNWHZ1HZ2HZ3CFMPNWHZ1HZ2HZ3 300-1283-1252-1514-1764300-1464-1428-1741-2036 250-1029-1003-1222-1431250-1173-1143-1399-1641 200-839-817-1006-1184200-953-927-1146-1349 150-664-646-799-943150-751-730-906-1072 0-1415 -1479-15970-1608-1606-1688-1830 Heat Pump HSPF 8.5 (kWh/yr)Gas Furnace AFUE 90 (therms/yr) CFMPNWHZ1HZ2HZ3CFMPNWHZ1HZ2HZ3 300-790-731-1142-1542300-68-66-83-98 250-617-572-888-1195250-54-53-66-78 200-491-454-701-961200-46-44-56-67 150-379-351-539-741150-35-33-42-51 0-609-590-731-8920-62 -64-68 Heating System Interaction CFM is airflow ducted to outside (“0” corresponds to no ducting) Negative values are a heating system debit 13

14. Cooling System Interaction None for houses without cooling system (Zonal Resistance and Electric Furnace) Cooling savings for ducted installations nearly negligible but not so for nonducted ones CFM is airflow ducted to outside (“0” corresponds to no ducting) Positive values are a cooling system benefit 14 Heat Pump SEER 13 (kWh/yr)Gas Furnace w A/C: SEER 13 (kWh/yr) CFMPNWHZ1HZ2HZ3CFMPNWHZ1HZ2HZ3 30020 30019 25018 25018 20017 20017 15016 15016 0153 0152

15. 15 Analysis Outputs: Savings Estimates DHW Savings Combined with Heat+Cool Interaction

16. Analysis Outputs: Combined Savings Tables 16 Zonal Resistance Heat (kWh/yr)Electric Resistance Furnace (kWh/yr) CFMPNWHZ1HZ2HZ3CFMPNWHZ1HZ2HZ3 300662692428197300484520206-70 250917942722531250776806549327 2009941016825666200884909690506 15011451163100988415010631083907761 05385374743740349350270147 Heat Pump HSPF 8.5 (kWh/yr)Gas Furnace AFUE 90 (kWh/yr) CFMPNWHZ1HZ2HZ3CFMPNWHZ1HZ2HZ3 300109011556982843001829183717781756 250126313149526322501839184717911771 2001267131110147442001726173416751657 1501352138711499351501706171416561640 0140714331248107101970197619301914

17. Measure Cost and Life Exhaust venting adder includes materials, labor, and concealing cost (wall board repair) http://www1.eere.energy.gov/buildings/appliance_standards/residential/pdfs/htgp_finalrul e_app8a.pdf Total Incremental Cost: $1,810 in 2011 $’s ($1,615 in 2006 $’s) Measure Life: 15 years – same as other RTF HPWH and WH measures 17 Tier 2 Items

18. Results with B/C Ratios 18 Annual Energy Saving (kWh/yr)Tier 1 Tier 2 HPWH LocationSpace Heat TypeSmall TankLarge TankAny Size Unheated Buffer LocationAny Heat Type 881 1,811 1,786 Interior Location Gas Heated Home 1,547 2,169 1,726 Interior Location Zonal Electric Heated Home 648 957 994 Interior Location Electric Furnace Heated Home 556 833 884 Interior Location Heat Pump Heated Home 1,189 1,686 1,267 Annual Energy Saving (therms/yr)Tier 1 Tier 2 HPWH LocationSpace Heat TypeSmall TankLarge TankAny Size Unheated Buffer LocationAny Heat Type (4) Interior Location Gas Heated Home (38) (52) (46) TRC B/C Ratio'sTier 1 Tier 2 HPWH LocationSpace Heat TypeSmall TankLarge TankAny Size Unheated Buffer LocationAny Heat Type 1.0 1.4 Interior Location Gas Heated Home 1.5 1.4 1.1 Interior Location Zonal Electric Heated Home 0.7 Interior Location Electric Furnace Heated Home 0.6 Interior Location Heat Pump Heated Home 1.3 0.9 Capital Cost (2011$'s)Tier 1 Tier 2 HPWH LocationSpace Heat TypeSmall TankLarge TankAny Size Unheated Buffer LocationAny Heat Type $ 1,009 $ 1,608 $ 1,535 Interior Location Gas Heated Home $ 1,060 $ 1,659 $ 1,810 Interior Location Zonal Electric Heated Home $ 1,060 $ 1,659 $ 1,810 Interior Location Electric Furnace Heated Home $ 1,060 $ 1,659 $ 1,810 Interior Location Heat Pump Heated Home $ 1,060 $ 1,659 $ 1,810

19. Call for Participants: Regional HPWH Evaluation Advisory Committee Scope 1.RTF sub-committee to study savings, AND 2.regional process and market evaluation Co-chaired by – RTF (Tom Eckman), and – NEEA (Dave Kresta) Kick-off meeting by end of Feb Anticipate bi-weekly meetings for several months, then monthly Contact Dave Kresta (dkresta@neea.org) if interested in participating by Feb 17 thdkresta@neea.org 19

20. Study Design 20 Lab tests of Voltex at 200 cfm to confirm performance estimates Same study design as for other HPWH – here’s the review: Three primary data collection areas – Hot Water Consumption – Space Conditioning Interaction (model inputs) – In-field COP Study Dates – Site/Participant recruitment Program participants through 3/31/2013 Overlap of site selection across data collection areas expected – Study data collection period: 6/1/2013 – 5/31/2014 Installation of monitoring equipment would occur well before 6/1/2013 – Provisional UES Sunset Date: 12/31/2014

21. Study Area: Hot Water Consumption Data Collected – Monthly hot water consumption (gallons) Sample – 200 sites Random/representative sample of program participants 21

22. Study Area: Space Heat Interaction Data Collected – Unheated Buffer Space-to-House UA – Unheated Buffer Space estimate of internal gains (equipment audit) Sample – 50 sites 22

23. Study Area: In-Field COP Data Collected – Hot water consumption (gallons) – Unheated Buffer Space-to-House UA – Unheated Buffer Space estimate of internal gains (equipment audit) – HPWH energy consumption Compressor and Fan Electric resistance – ΔT of water delivered – Ambient temperature – For tier 2 (assumes constant speed fan): Two-time measurement of – airflow – incoming air temperature Sample – 75 sites Site selections weighted by program occurrence of HPWH model, installation location, and heating zone. 23

24. Measure Checklist 24

25. Discussion Installation specification Installations with larger airflows? 25

26. Motion to Adopt “I _________ move that the RTF approve the addition of Tier 2, Ducted Interior Installations to the UES for Heat Pump Water Heaters under provisional status with a sunset date of December 31 st, 2014.” 26