Residential New Construction Montana House: UES Measure Update

Adam HadleyRegional Technical Forum

April 14, 2015

2

Overview

Today, we are seeking RTF approval of:• updated measure specifications• revised measure savings• revised measure costs

3

Measure OverviewMeasure Specification(link to: Proposed Specification)

Construction of and installation of lighting and appliances in single family residences built in Montana in accordance with the Montana House 2 Program Specification.

Measure Developers Flathead Electric, Ravalli Electric, Missoula Electric, RTF

CAT Review Adam Hadley

Tech Sub-Com Review D. Bopp, J. Maunder, D. Rogers, A. Hadley

R&E Sub-Com Review n/a

Notes • June 2011: Measure approved (updated from the first MT House version)

• July 2014: Measure put Under Review, sunset set to October 2014

• October 2014: Sunset date extended to April 2015• MT hadn’t yet adopted a new state code. (Montana

adopted as its code the 2012 IECC with amendments in November 2014. link to summary)

4 Measure Specification Changes/Updates(listed in approximate order of impact on measure)

Link to: Proposed Measure Specification, tracked changes

1. Added a “Flash and Fill” optional prescriptive path– Wall Insulation (less efficient): 2x6 standard framing with 2 inches of spray foam,

then filled with cellulose– Windows (more efficient): U–0.28– Envelope Tightness (more efficient): 3.0 ACH50

2. Added airflow requirement for air source heat pump CC&S– Also, edited section to align with RTF CC&S spec

3. Now require ducts inside4. Removed water heater efficiency requirements

– Previous spec had a minimum EF table for electric resistance tanks, now covered in the baseline under the new federal standards

5. Mechanical ventilation section removed– Now required per code

6. Removed requirement for utility to test envelope tightness on 10% of houses– Reason: Envelope tightness should be covered under delivery verification

7. Skylight area maximum of 2% of floor area

5

Energy Savings Updates(listed in approximate order of impact on savings)

Link to: Proposed Measure Workbook, and SEEM Runs1. Used latest version of SEEM, latest calibration2. Add savings from new ducts inside requirement

– RTF Judgment Required: Baseline set at “PTCS” tightness levels to approximate code duct sealing and testing requirements• Code: “… leakage to the outdoors must be equal to or less than 4 cfm per 100 sq.ft. of conditioned

floor area…”)• SEEM baseline inputs:

3. Now including savings for air source heat pump CC&S– CAT Recommendation: Set ASHP measures to “Planning” category, and use the CC&S

research strategy

4. Baseline updated to match MT code– Windows: U-0.33 U-0.32– Lighting: 50% efficient 75% efficient

5. Add dishwasher savings– Existing measure UES does not include water heater and dishwasher savings (claimed

separately)

2200c 2200s 2688bSuppl y Duct 6% 6% 1%Ret ur n Duct 3% 3% 2%

Leakage Fr act i on

Pr ot ot ype2200c 2200s 2688b

Suppl y Duct Cr awl At t i c I nRet ur n Duct At t i c At t i c At t i c

Duct Locat i on

Pr ot ot ype

Existing ProposedProposed F&F path

(previous)2011 Code

(current)2014 Code

MT House 2:Path A

MT House 2: Path B

Attic InsulationWall Insulation R-21 Int.+ R-5 Flash & FillFloor Insulation

Slab Insulation (unheated)

Slab Insulation (heated)Basement Wall

Sealed Crawlspace Wall

Windows U - 0.33 U - 0.32 U - 0.30 U - 0.28Skylights U - 0.60 U - 0.55Max Glazing AreaExterior Doors U - 0.33 U - 0.32

Ventilation N/AWhole House

and Spot

Envelope Tightness YesVisual or 4.0

ACH50 Tested4.0 ACH50

Tested4.0 ACH50, 10%

tested3.0 ACH50, 10%

testedHeat Pump HSPFHeat Pump CC&S NoAir ConditionerDuct Leakage NoDuct InsulationLighting 50% CFL 75% CFL

Water HeaterOld Fed. Minimum

New Fed. Minimum

Dishwasher No

R-10 perimeter, 4'

Component

R-19 (R-15 Continuous)

R-21 ContinuousR-19 (R-15 Continuous)

N/A (Meet Code)

U - 0.16

NoNoYes

No

Efficient-Case

R-15 perimeter, 4' R-15 perim. 4' + R-10 full + R-5 TB

U - 0.50

R-60 Advanced FramingR-21R-30 R-38

R-49

R-10 full w/ R-5 TB

Baseline

no requirement

Federal Minimum Federal Minimumno requirement

Federal Minimum 8.5

15% of Floor Area (2%skylights)

400 CFM/ton, 35 deg F ODT, 30 deg

R-21

No

Yes

Included in Savings?

YesYesYes

Yes

NoYes

Yes

NoYes

No

YesYes

Yes

Yes

Ducts InsideDucts Inside

N/A (Meet Fed. Minimum)

Federal Minimum ENERGY STAR

R-6 (R-8 attic supply)Sealed and Tested

90% CFL

No

6

Blue Text: Change or addition to the MT House Specification. Red Strikeout Text: Removed from MT House Specification.

7

0

1000

2000

3000

4000

5000

6000

ZonalEl FAFelec ASHtPmp GSHtPmp

Hea

ting

Ener

gy S

avin

gs (k

Wh/

yr)

Heating Zone 3

VCrawl FlashnFill

VCrawl R5exterior

VCrawl existing

UCrawl FlashnFill

UCrawl R5exterior

UCrawl existing

Basemt FlashnFill

Basemt R5exterior

Basemt existing

SlabOG FlashnFill

SlabOG R5exterior

SlabOG existing

Difference between “R-5 Exterior Sheathing” and “Flash and Fill” paths is insignificant. Proposal: Take the average and do not have “prescriptive path” as a measure identifier.

VCrawl = Ventilated CrawlspaceUCrawl = Un-ventilated Crawlspace (i.e. Sealed Crawlspace)

8

Total Savings includes: heating, cooling, lighting, and dishwasher savings

0

1000

2000

3000

4000

5000

6000

ZonalEl FAFelec ASHtPmp GSHtPmp

Tota

l Ele

ctric

Ene

rgy

Savi

ngs

(kW

h/yr

(Heating Zone 3 (Cooling Zone 1) - Total Measure Savings

VCrawl Proposed

VCrawl Existing

UCrawl Proposed

UCrawl Existing

Basemt Proposed

Basemt Existing

SlabOG Proposed

Slab OG Existing

9

$-

$500

$1,000

$1,500

$2,000

$2,500

$3,000

$3,500

$4,000

ZonalEl FAFelec ASHtPmp GSHtPmp

Incr

emen

tal C

apita

l Cos

tHeating Zone 3 (Cooling Zone 1) - Measure Cost

VCrawl Proposed

VCrawl Existing

UCrawl Proposed

UCrawl Existing

Basemt Proposed

Basemt Existing

SlabOG Proposed

Slab OG Existing

Proposed costs are the same as existing costs, except: CFL costs were zeroed out (Baseline cost = Efficient-case cost) and dishwasher costs were added (per ResDishwasher_v2_2.xlsm; only $5).

10

-

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

ZonalEl FAFelec ASHtPmp GSHtPmp

Bene

fit/C

ost R

atio

Heating Zone 3 (Cooling Zone 1) - Regional Cost-Effectivenes Test

VCrawl Proposed

VCrawl Existing

UCrawl Proposed

UCrawl Existing

Basemt Proposed

Basemt Existing

SlabOG Proposed

Slab OG Existing

Not Cost-Effective

11

Proposed Motion

“I _________ move, for the Residential New Construction Montana House 2 UES measure, the RTF:

• Adopt the revised specifications, costs, and savings• Set the sunset date to April 2018• Keep the Status at ActiveFor non-ASHP heating systems:• Keep the Category at ProvenFor ASHP heating systems:• Set the Category to Planning• Adopt the CC&S UES measure’s Research Strategy (link, slide

19)”