Idaho and Montana Residential Single Family New Construction Measures Mohit Singh-Chhabra Regional Technical Forum October 20 th, 2015.

Idaho and Montana Residential Single Family New Construction Measures

Mohit Singh-ChhabraRegional Technical Forum

October 20th, 2015

2

Measures Being Discussed Today

• New Construction: Idaho ENERGY STAR Single Family

• New Construction: Montana ENERGY STAR Single Family

• New Construction: Energy Star Homes SF - BOP2 ID/MT

• New Construction: Energy Star Homes SF – DHP TCO ID/MT

These measures are currently active, sunset on 12/2015

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Presentation ObjectiveToday, we are seeking decisions on:1. Deactivate DHP TCO and BOP2 prescriptive

paths for ID and MT2. Decision on ID and MT New Construction

measure– Should it be (a) deactivated OR (b) accept updated

measure analysis?• Note: If approved, measures will be Planning due to

presence of Commissioning Controls and Sizing (CC&S). RTF approved CC&S research strategy exists

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Measure Overview

CAT Team Review Yes• Energy Savings calculated using existing QC’ed SEEM models with

state code updatesTech Sub-Com Review

No official subcommittee• CAT have been working with Northwest ENERGY STAR team on

measure specs and measure uptake• CAT checked in with utilities in MT and ID on measure uptake

Notes The measure is changing from a prescriptive to a performance based measureNew state codes are almost equivalent to current definition of Northwest ENERGY STAR reference home

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Change in ENERGY STAR Program DeliveryRevised measure identifiers to reflect new ENERGY STAR specification– Measure Identifiers (heating and cooling zone identifiers remain

the same):

– Savings now based on the “ NW ENERGY STAR Reference Home”

ExistingENERGY STAR Path:1. Northwest ENERGY STAR home2. DHP TCO3. BOP 2 (HRV, Zonal electric)Heating/Cooling System Type:A. Gas FAF with CACB. Gas FAF without CACC. Air Source Heat PumpD. Zonal electric resistance heat

ProposedENERGY STAR Path:1. Northwest ENERGY STAR Reference Home

Heating/Cooling System Type:A. Gas FAF with CACB. Gas FAF without CACC. Electrically Heated

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Changes in ENERGY STAR Program Delivery (contd.)

• The NW ENERGY STAR reference home is a performance metric

• Homes with modeled consumption less than the ENERGY STAR reference home qualify as ENERGY STAR– Currently modeling is done in REMRate

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RTF Decision - 1

“I, _______, move the RTF to deactivate the following measures as they are not being supported by NW ENERGY STAR: • New Construction: Energy Star Homes SF - BOP2

ID/MT• New Construction: Energy Star Homes SF – DHP

TCO ID/MT”

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Change in Residential Building Code

• Idaho and Montana both adopted IECC 2012 with separate amendments

• Need to split current measure into separate measure applications for ID and MT– Current measures were combined as ID and MT

used similar code for SF NC• Key differences:

Property Idaho Montana

Infiltration 7 ACH50* 4 ACH50

Windows U-0.32 U-0.35*Some jurisdictions have opted to follow IECC standard of 3 ACH50. Population weighted average value is 6

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Idaho and Montana ENERGY STAR Reference Home

ID Code Case MT Code Case NW ENERGY STARR-20 or R-13 +5 ci R-21 or R-13 +5 ci

eff. U - 0.057eff. U - 0.057; 0.054 in IECC zone 6

R-38 (R-49 in IECC climate zone 6)

R-49/38 (Flat/Vaulted)

Floor InsulationWindow U 0.35 U 0.32 U 0.30

Infiltration7 ACH50 (3 ACH in some jurisdictions)

4 ACH50 4 ACH50

Ventilation 2.9 CFM/ Watt

Heating System9 HSPF if Heat Pump (with CC&S); 90% if Gas Furnace

Lighting 50 % effi cient (eq. CFL) 75 % effi cient (eq. CFL) 80% CFLDishwasher ENERGY STARWater Fixtures 1.75 gpm showerheads

Wall Insulation U≤ .051

eff. U = 0.03 / 0.026 for IECC climate zone 6

R30

R-38 (R-49 in climate zone 6) with ≥ R-21 at edge

Current Practice

Current Practice. 8.5 HSPF Heat Pump; 78% eff. Gas Furnace

Current PracticeCurrent Practice

Ceiling Insulation

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Required Changes in Published ENERGY STAR Specification

This is where code has caught up:• Ceiling Insulation: MT code U-value for IECC zone 6

is may be higher than ENERGY STAR requirement for that zone depending on building geometry

• Below Grade Walls: Must meet minimum state code requirements

• Infiltration: Current requirement is 4 ACH50; need to clarify that infiltration must meet IECC 2012 standard 3 ACH50 in jurisdictions that require it

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Required Changes in Published ENERGY STAR Specification (contd.)

These measure related requirements need to be clarified:• Heat Pumps: Require all installation to do CC&S. CC&S is

a significant source of savings (~66% of heating savings); presence of CC&S makes this a planning measure– All measures with CC&S are currently planning; RTF approved

CC&S Research Strategy exists• Appliances: Currently requires all appliances be ENERGY

STAR; in the proposed measure only dishwashers are ENERGY STAR– As per current RTF workbook, no savings associated with

dishwashers

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Measure Specifications (contd.)

• Measure specification for ENERGY STAR has remain unchanged despite federal and state code upgrades– Home envelope efficiency– Appliances federal standards

• Reduced efficiency gap between state code and ENERGY STAR– NW ENERGY STAR team intends to move to a protocol

based savings metric in the near future, keep the ENERGY STAR specification unchanged until then

RTF Direction Required• CAT proposes these measures be deactivated

– No significant building shell improvements over code in Montana– No significant building shell improvements over code in Idaho with the

exception of infiltration in parts of Idaho– Main source of heating savings is CC&S requirement in reference home.

• Note: This CC&S Planning estimate would be eligible for trade off– NEEA intends to develop the Next Step Homes standard protocol measure

for all Single Family New Construction• RTF has been tracking progress on this standard protocol and is helping NEEA

develop this• NW ENERGY STAR does not plan to keep RTF UES measures for new homes past

2016; the RTF will likely deactivate these Planning measure anyway– Individual measure components can be developed as stand alone

measures; DHP for new construction already planned• Note: Staff will follow up on status of WA and OR ENERGY STAR SF

measures w.r.t. code as well and report to the RTF if necessary

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Should the Measure be Deactivated?Contacted the following utilities to inquire if they would be fine with measure deactivation, they were fine.• Flathead Electric• Missoula Electric Coop• Mission Valley Power• Ravalli Electric

NW ENERGY STAR reported the following uptake in the last 2 years for SF homes (mostly pre code update):

Gas No ACGas with

ACHeat

PumpZonal Electric

Idaho 24 282 13 12Montana 50 39 2 0

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If RTF decides to deactivate the measure, go to RTF decision slide for deactivation (next)Else, go through measure analysis

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RTF Decision – 2a

“I, ________, move that the RTF deactivate the following measures:• New Construction: Idaho ENERGY STAR Single

Family• New Construction: Montana ENERGY STAR

Single Family”

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Only go through the next few slides if the RTF decides to not deactivate the measures

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Energy Savings Analysis: What Should the Baseline Heating System Be?

Then:

Now:

Under current ENERGY STAR program, the same savings can be claimed by a home with any heating system type as long as it meets performance of Reference Design Home

Code Heating System ENERGY STAR Heating SystemGas Heating --> Gas Heating?Zonal Heating -->Zonal Heating -->Heat Pump -->

Electric Heat

Code Heating System ENERGY STAR Heating SystemGas Heating --> Gas HeatingZonal Heating --> Zonal HeatingZonal Heating --> Ductless Heat PumpHeat Pump --> Heat Pump

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Energy Savings Analysis: BaselineAssuming that the baseline code home has the same heating system as its energy efficient home may not be appropriate in the world of performance based measures where a builder can test different heating systems among other measures for trade-offs on energy consumption.• CAT recommendation: This measure is Planning; make

the simplifying assumption that base case has the same heating system type as ENERGY STAR performance reference home (Heat Pump)– A more detailed baseline discussion will be had when

developing the New Construction Next Step Homes Standard Protocol

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Energy Savings Analysis: Heating

• Savings calculated using SEEM• Phase 1 and Phase 2 calibration applied• New SEEM workbook developed by updating

previously QC’ed new construction SEEM workbook

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Energy Savings Analysis: Lighting

New Residential Lighting Workbook applied to calculate baseline lighting energy use and energy savings• RBSA data used to determine lamp type data per

average SF home– Total sockets, sockets per lamp type

• Res Lighting workbook applied to RBSA-determined lamp data to calculate baseline energy consumption, savings and incremental cost

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Energy Savings Analysis: Low Flow Showerhead

Basis of savings calculations is latest RTF workbook• Savings per home are calculated by first

multiplying number of showerheads per home (RBSA) by per unit savings from showerheads (Any, Direct Install). The number of showerheads per home estimate from RBSA was adjusted to represent larger size of new construction

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Energy Savings – Idaho

0

1000

2000

3000

4000

5000

6000

CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 HZ1 HZ2 HZ3

HZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ

Gas Furnaces, CAC Electrically Heated/ HP Electrically Heated/ DHP Electrically Heated/ Zonal GasFurnaces,No

CAC

kWh

Existing Proposed

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Energy Savings – Montana

-1000

0

1000

2000

3000

4000

5000

6000

CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 HZ1 HZ2 HZ3

HZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ

Gas Furnaces, CAC Electrically Heated/ HP Electrically Heated/ DHP Electrically Heated/ Zonal GasFurnaces,No

CAC

kWh

Existing Proposed

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Cost AnalysisStandard Information Workbook provided incremental cost data for:• Windows• HP Upgrades• CC&S

Infiltration: Assumed same cost as existing Wx workbook• No change from existing measure workbook

Incremental Cost for Low Flow Showerheads and Lighting taken directly form latest RTF workbook

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Incremental Cost – IdahoCZ

1

CZ2

CZ3

CZ1

CZ2

CZ3

CZ1

CZ2

CZ3

CZ1

CZ2

CZ3

CZ1

CZ2

CZ3

CZ1

CZ2

CZ3

CZ1

CZ2

CZ3

CZ1

CZ2

CZ3

CZ1

CZ2

CZ3

CZ1

CZ2

CZ3

CZ1

CZ2

CZ3

CZ1

CZ2

CZ3

HZ1

HZ2

HZ3

HZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZGas Furnaces, CAC Electrically Heated/ HP Electrically Heated/ DHP Electrically Heated/ Zonal Gas Fur-

naces,No CAC

0500

100015002000250030003500400045005000

Existing Cost Updated Cost

Incr

emen

tal C

ost (

2006

$)

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Incremental Cost – Montana

0

500

1000

1500

2000

2500

3000

CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 HZ1 HZ2 HZ3

HZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ

Gas Furnaces, CAC Electrically Heated/ HP Electrically Heated/ DHP Electrically Heated/ Zonal GasFurnaces,No

CAC

Incr

emen

tal C

ost (

2006

$)

Existing Cost Updated Cost

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0

1

2

3

4

5

CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 HZ1 HZ2 HZ3

HZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ

Gas Furnaces, CAC Electrically Heated/ HP Electrically Heated/ DHP Electrically Heated/ Zonal GasFurnaces,No

CACExisting TRC Updated TRC

TRC Results: Idaho

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0

1

2

3

4

5

CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 CZ1 CZ2 CZ3 HZ1 HZ2 HZ3

HZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ

Gas Furnaces, CAC Electrically Heated/ HP Electrically Heated/ DHP Electrically Heated/ Zonal GasFurnaces,No

CACExisting TRC Updated TRC

TRC Results: Montana

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Sunset Criteria

Proposed sunset date is 12/2016• NW ENERGY STAR does not plan to support a

UES measure beyond 2016

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RTF Decision 2b

“I _________ move that the RTF approve the Idaho and Montana ENERGY STAR New Construction Single Family measure analysis as presented and:

• Set measure status to Active• Set measure category to Planning• Set sunset date to 12/2016”