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Washington Energy Star and Built Green Homes Measure

UpdateNew Measure Proposal

August 12th, 2014

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Measure background

• Measure Name: Energy Star Homes and WA Built Green

Homes• Measure Type: UES• Measure Category: Proven• Measure Sector: Residential• Sunset Date: August, 2017 • Reason for Update: Change in State Code and

Energy Star Standard

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Staff Highlighted Areas

• Cost of infiltration reduction. Should these differ from infiltration reduction on existing homes?• Assumption $ 250 / 0.1 ACHn

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Specs Development Background• WA 2012 residential code allows a builder to choose one of

many paths• RTF staff worked with WA department of Commerce, NW Energy

Star and Ecotope Consulting to define typical code compliance paths

• RTF Subcommittee formed to help draft Energy Star and Built Green home specs for WA• Built Green 3 or 4 star will use same specs as Energy Star

• These specs provide a Reference Home that may be built to prescriptively or used as an energy use modeling target. Builders to use NW REMRate as a Energy Star compliance tool for RTF approved trade-offs.

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Measure Summary: Gas Heated Homes gfac_3a_2a_5a

(40%)gfac_4_5a (40%) gfac_5b (20%)

Above Grade WallsR 21/ R 21+5 for

hz3R 21/ R 21+5 for

hz3R 21/ R 21+5

for hz3R 21 adv. / R 21+5 for hz3

Above Grade Floors R 30 R 30 R 30 R-38

CeilingsR 49 R 49 R 49

R-49 + 21 heel (R 49 adv.)

Glazing U Value 0.3 0.3 0.3 0.28

Infiltration 4 ACH 50 5 ACH 50 PA 5 ACH 50 PA 3 ACH

Heating System 95% AFUE 80% AFUE78 % AFUE

(Federeal Std)95% AFUE

Ventilation Fan 0.35 W/ CFM0.03942 * CFA + 29.565 (Nbr + 1)

0.03942 * CFA + 29.565 (Nbr +

1)0.35 W/ CFM

Water Heater 0.62 EF 0.62 EF 0.82 EF 0.62 EF

Water Fixtures Low Flow Low Flow NA Low Flow

Duct Location - Ducts Inside - Ducts Inside

Lighting 75% efficient 75% efficient 75% efficient 90% efficient

Code OptionEnergy StarBuilt Green

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Measure Summary: Electric Homes

Above Grade WallsR 21/ R 21+5 for z6

R 21 adv. / R 21+5 for hz3

Above Grade Floors R 30 R-38

Ceilings R 49R-49 + 21 heel (R

49 adv.)

Glazing U Value 0.3 U Value 0.28

Infiltration 5 ACH 50 PA 3 ACH

Heating System 8.5 HSPF 9 HSPF

Ventilation Fan0.03942 * CFA + 29.565 (Nbr + 1)

0.35 W/ CFM, High Efficacy

Water Heater 0.93 EF 0.93 EF

Water Fixtures Low Flow Low Flow

Duct Location - Ducts Inside

Lighting 75% efficient 90% efficient

Code Option: hp85_3b_5a

Energy StarBuilt Green

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Energy Savings Calculations• Simulations conducted in SEEM 96

• RTF approved new construction heating calibration applied

• Staff proposed cooling calibration applied

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Incremental Cost

• Incremental cost derived from the following sources:• Standard Information Workbook• 6th Power Plan Appendix• Existing RTF workbooks• Energy Trust Resource Assessment

• Cost of infiltration reduction. Should these differ from infiltration reduction on existing homes?• Assumption $ 250 / 0.1 ACHn

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Estimated Useful Life

• EUL of new construction measure is set at 45 years

• Measures with EUL < 45 years have recurring cost at EUL

• Source for EUL:• Existing measure workbooks• DEER• EUL consistent with new construction measures in other

states

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Energy Savings Comparison

Note: Existing kWh are an average of all Existing Energy Star New Construction measures. There were three different paths to Energy Star: Envelope, Equipment and Ducts Inside path.

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500

1,000

1,500

2,000

2,500

3,000

3,500

4,000

HZ1

_CZ1

HZ1

_CZ2

HZ1

_CZ3

HZ2

_CZ1

HZ2

_CZ2

HZ2

_CZ3

HZ3

_CZ1

HZ3

_CZ2

HZ3

_CZ3

HZ1

_CZ1

HZ1

_CZ2

HZ1

_CZ3

HZ2

_CZ1

HZ2

_CZ2

HZ2

_CZ3

HZ3

_CZ1

HZ3

_CZ2

HZ3

_CZ3

Gas Furnace With CAC Heat Pump

Proposed kWh Existing kWh

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Incremental Cost Comparison

Note: Existing Cost are an average of all Existing Energy Star New Construction measures. There were three different paths to Energy Star: Envelope, Equipment and Ducts Inside path.

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500

1,000

1,500

2,000

2,500

3,000

3,500

4,000H

Z1_C

Z1

HZ1

_CZ2

HZ1

_CZ3

HZ2

_CZ1

HZ2

_CZ2

HZ2

_CZ3

HZ3

_CZ1

HZ3

_CZ2

HZ3

_CZ3

HZ1

_CZ1

HZ1

_CZ2

HZ1

_CZ3

HZ2

_CZ1

HZ2

_CZ2

HZ2

_CZ3

HZ3

_CZ1

HZ3

_CZ2

HZ3

_CZ3

Gas Furnace With CAC Heat Pump

Proposed Cost ($) Existing Cost ($)

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Cost Effectiveness Comparison

Note: Existing TRC are an average of all Existing Energy Star New Construction measures. There were three different paths to Energy Star: Envelope, Equipment and Ducts Inside path.

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0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

HZ1

_CZ1

HZ1

_CZ2

HZ1

_CZ3

HZ2

_CZ1

HZ2

_CZ2

HZ2

_CZ3

HZ3

_CZ1

HZ3

_CZ2

HZ3

_CZ3

HZ1

_CZ1

HZ1

_CZ2

HZ1

_CZ3

HZ2

_CZ1

HZ2

_CZ2

HZ2

_CZ3

HZ3

_CZ1

HZ3

_CZ2

HZ3

_CZ3

Gas Furnace With CAC Heat Pump

Proposed TRC Existing TRC

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RTF Proposed Motion:

“I _________ move that the RTF:

• Adopt the WA Energy Star and Built Green measures and set the sunset date to August 2017