1 Mission Valley Power Energy Efficient Home Program and GSHP Deemed Savings Analysis September 30,...

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Mission Valley Power Energy Efficient Home Program and GSHP

Deemed Savings Analysis

September 30, 2008

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Background

• Mission Valley Power (MVP) requested that the RTF review its specifications for a new residential construction program to establish a deemed savings value and cost-effectiveness

• MVP also provided an analysis of the potential savings from requiring R-10 full under slab insulation with an R-5 slab edge thermal break for RTF review and potential adoption as a deemed measure

• Lincoln Electric also requested that the RTF review the cost-effectiveness of Geothermal Heat Pumps installed in MVP or Energy Star homes

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MVP Deemed Savings Analysis – R-10 Full Slab w/R-5 Thermal Break

• Used WattSUN • Assumed MT Code as baseline, then modeled full slab

insulation w/ thermal break (UA 549) vs UA 518)– Wall (Above Grade) = R-19– Wall (Below Grade) = R-11 (0.054 base/0.056 w/full slab)– Attic = R-38– Glazing = U- 0.35– Door = U-0.19– On grade slab – R-0 (F-0.73) & R-10 w/R-5 TB (F-0.36)– Below grade slab = R-0 (F-0.56) & R-10 w/R-5 TB (F-0.42)

• MVP Supplied Cost Data - $0.85 sq.ft.

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Results of Review – R10 Full Slab

• WattSun Savings = 1.5 kWh/sq.ft. slab – WattSUN savings are based on (TMY2)– Used Kalispell weather– Zonal electric heating assumed

• SEEM Savings – Based on TMY 3– Used Missoula weather (Zone 3 Reference site)– Analyzed 5 heating system types

Results of Review – R10 Full Slab Savings (2)

Heating System Type Savings (kWh/sq.ft.)

FAF w/CAC 1.2

FAF 1.2

Zonal 1.1

HP - Fed Std HSPF 7.7 0.6

HP - Estar HSPF 8.5 0.6

Results of Review – R10 Full Slab Cost- Effectiveness (3)

Heating System Type TRC Benefit/Cost Ratio

FAF w/CAC 1.5

FAF 1.5

Zonal 1.4

HP - Fed Std HSPF 7.7 0.8

HP - Estar HSPF 8.5 0.8

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MVP Deemed Savings Analysis – Energy Efficient Home

• Used WattSUN model w/Kalispell Weather• Assumed MT Code as baseline, compared

to– EStar Home BOP 2 – MVP Home specifications

• WattSUN Results– EStar Home BOP 2 = 32% savings– MVP Home = 36% savings

Savings Review Input Assumptions – Crawlspace Home

*Assumed value for unconditioned crawl space. Construction not allowed under EStar BOP2.

ComponentMT Code Vented MVP Vented

MT Code Sealed MVP Sealed

Floor R-21 R-38 None None

Crawl Perimeter N/A N/A R-19 R-21

Glazing U-0.35 U-0.32 U-0.35 U-0.32

Doors U-0.19 U-0.16 U-0.19 U-0.16

Wall (Above Grade) R-21 Std R-26 Adv R-21 Std R-26 Adv

Attic R-38 R-49 Adv R-38 R-49 Adv

Infiltration 0.35 ach0.30 w/o HRV 0.35 ach

0.30 w/o HRV

Overall UA 453 367 512 447

Savings Review Input Assumptions – Slab & Heated Basement

*MT Code does not require below grade walls to be insulated until “finished.” EStar & MVP require R-21 insulation at time of construction.

ComponentMT Code Slab MVP Slab BOP2 Slab

MT Code Basement

MVP Basement

BOP2 Basement

Slab on Grade R-13 per. R-10 full R-10 per. N/A N/A N/A

Slab below Grade N/A N/A N/A None R-10 Full R-10 per.

Glazing U-0.35 U-0.32 U-0.30 U-0.35 U-0.32 U-0.30

Doors U-0.19 U-0.16 U-0.19 U-0.19 U-0.16 U-0.19

Wall (Above Grade) R-21 Std R-26 Adv R-21 + 2.5 R-21 Std R-26 Adv R-21 + 2.5

Wall (Below Grade) N/A N/A N/A R-11 R-21 Adv R-19

Attic R-38 R-49 Adv R-38 R-38 R-49 Adv R-38

Infiltration 0.35 ach0.30 w/o HRV 0.20 ach 0.35 ach

0.30 w/o HRV 0.20 ach

Overall UA 494 399 437 488 402 380

Results of Review – MVP Home Zonal Electric Space Heating Savings

Annual Use (kWh)Slab on Grade

Vented Crawl

Sealed Crawl*

Heated Basement

MT Code 19,357 18,514 20,687 16,684EStar BOP2 17,243 15,086 17,442 12,105MVP 15,046 14,610 17,842 13,057

Savings Over MT Code (kWh/yr)EStar BOP2 2,114 3,429 3,245 4,579MVP 4,310 3,904 2,845 3,627

Percent Savings Over MT CodeEstar BOP2 11% 19% 16% 27%MVP 22% 21% 14% 22%

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Not Equivalent To or Better Than EStar BOP2

Results of Review – MVP Home Forced Air Furnace w/o CAC Space Heating Savings


Vented Crawl

Sealed Crawl

Heated Basement




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Results of Review – MVP Home Air Source Heat Pump Space Heating Savings


Vented Crawl Sealed Crawl

Heated Basement


MVP+ 9,957 11,313 10,642 6,471Savings Over MT Code (kWh/yr)EStar BOP1 2,810 4,871 3,523 2,400MVP 3,116 2,970 1,986 2,027MVP+ 4,838 4,646 3,875 3,595Percent Savings Over MT Code

EStar BOP1 19% 31% 24% 24%MVP 21% 19% 14% 20%MVP+ 33% 29% 27% 36%

12MVP+ = Requires PTCS Controls (Outside Thermostat & No First Stage Resistance & ARI Staging

MVP Home Proposed Lighting Specifications Impact on Savings

• MVP Proposal – 25% of sockets @ CFL

• EStar Requirement – 50% of sockets @ CFL

Crawl/Slab Basement Crawl/Slab Basement

W/sf kWh/yr kWh/yr Gains Btuh Gains Btuh

MT Base 1.75 2811 3434 2713 3189

MVP 1.43 2297 2806 2539 2945

EStar 1.1 1767 2158 2364 2700

Results of Review – MVP Home Zonal Electric Space Heating + Lighting Savings


Vented Crawl

Sealed Crawl

Heated Basement




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Results of Review – MVP Home Forced Air Furnace w/o CAC Space Heating Savings


Vented Crawl

Sealed Crawl

Heated Basement




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Results of Review – MVP Home Air Source Heat Pump Space Heating + Lighting Savings


Vented Crawl Sealed Crawl

Heated Basement


MVP+ 12,253 13,609 12,939 8,630Savings Over MT Code (kWh/yr)EStar BOP1 3,854 5,915 4,567 3,676MVP 3,630 3,483 2,500 2,655MVP+ 5,352 5,160 4,389 4,870Percent Savings Over MT Code

EStar BOP1 22% 32% 26% 27%MVP 21% 19% 14% 20%MVP+ 30% 27% 25% 36%

16MVP+ = Requires PTCS Controls (Outside Thermostat & No First Stage Resistance & ARI Staging

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Summary of MVP Home Findings

MVP Home Equivalency with Energy Star BOPsFoundation/System Zonal

ElectricElectric FAF Air Source

HP*

Slab-on-Grade

Vented Crawlspace

Sealed Crawlspace

Heated Basement

*Requires PTCS Controls (Outside Thermostat & No First Stage Resistance Heating & ARI Staging of Backup

Recommendations

• Establish deemed savings for R10 full slab insulation• Establish New Technical Compliance Option (TCO) for

MVP Homes that produce savings equivalent to existing Energy Star Builder Option Packages (BOPs)

• Establish deemed savings for MVP Homes that are not equivalent to Energy Star

• Establish deemed savings for GSHP conversions and upgrades installed MVP Homes

Geothermal Heat Pump Cost-Effectiveness

• Existing GSHP Cost Data from Oregon Trail Coop, supplemented by Ravalli, Flathead and Lincoln Electric– OTEC Average Installed Cost/Ton = $3,363– MT Coop Average Installed Cost/Ton = $3,327

• All GSHP Installations assumed to install de-superheater ($1150) which saves additional 1200 kWh/yr (33% of DHW use)

• SEEM FAF Use adjusted for GSHP COP and SEER– COP = 3.3– SEER = 16

• No PTCS Duct Sealing or Commissioning Assumed

All cost adjusted to 2006$

Cost-Effectiveness Input Assumptions – Space Heating Use

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

MVP Crawlspace MVP Basement Existing FAF Crawlspace Existing FAF Basement

An

nu

al S

pa

ce H

ea

ting

Use

(kW

h)

Elec FAF No Central AC

Heat Pump HSPF 7.7/SEER 13

GSHP HSPF 11.3/SEER 16

Cost-Effectiveness Input Assumptions - Costs

System Type First Cost

Annual O&M

Periodic Replacement

Convert Electric FAF to GSHP

$10,090 $25 $350

Upgrade Air Source HP to GSHP

$6,790 $- $-

Cost-Effectiveness Results – Total Resource Benefit/Cost Ratio

Measure TRC B/C Ratio

Existing Crawlspace Convert Electric FAF to GSHP 1.6

Existing Basement Convert Electric FAF to GSHP 1.3

MVP/EStar Crawlspace Convert Electric FAF to GSHP 1.1

MVP/EStar Basement Convert Electric FAF to GSHP 0.9

MVP/EStar Crawlspace Upgrade Air Source HP to GSHP 0.7

MVP/EStar Basement Upgrade Air Source HP to GSHP 0.6

1 Mission Valley Power Energy Efficient Home Program and GSHP Deemed Savings Analysis September 30,...

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