HEADING TO NET-ZERO BY 2020

Jim ParksEECR&D Manager

Energy Efficiency and Customer Research and Development

Background

• Building America – A Voluntary US Department of Energy Program

• Goals – 60% Reduction in Energy Bill Initially– Target Annual Net-Zero Electricity Use– Use Commercially Available Technologies– Annual Net-Zero Energy Use by 2020

Initial Foray into ZEH• Optional PV combined with EE• Beazer Powerhouse 2000-02

– 5 Subdivisions/18 PV Installs– Entry level – Optional PV– 3,300 Watt ac

• Morrison Homes Lakeside 2003– 12 PV homes out of 90+ homes– Move-up, in-fill project– Spec’d and Optional Upgrade– >30% Title-24, 2 kW ac Solar

A Step Up• PV in all homes + EE• Premier Homes Premier Gardens 2004-05

– 95 units– Entry level, in-fill project– >30% Title-24, 2 kW PV– Standard Feature

• Treasure Homes 2006-07– 32 units– Entry level, in-fill project– >40% Title-24, 2 kW PV– Standard Feature

Features

40% Better Than 2005 Title-24 StandardsMeasure Base ZEH Attic Insulation R-38 R-38Radiant Barrier No YesWall Insulation R-13 R-13 + 1” R-4.2 FoamQuality Installation No YesLow Air Infiltration Yes YesWindows Vinyl, low U,SHGC Vinyl, Low U, SHGCFURN AFUE 0.80 0.95A/C SEER 13 (3.7 ton) 14 w/TXV (3.1 ton)ACCA Design No Yes -- Short RunsDuct Testing No YesWater Heater storage EF .60 Tankless EF .82Distribution Standard Pipe insulationHome Energy Rating No YesFluorescent Lighting Yes Yes (All fixtures)Solar Electric NA 2kW AC Solar System

Real Bill Savings – Hitting the TargetSolar vs Non Solar Avg Monthly Bills 2007

$0.00

$20.00

$40.00

$60.00

$80.00

$100.00

$120.00

Avg. Mo.Bill

Jan, 07 Feb, 07 March, 07 April, 07 May, 07 June, 07 July, 07 Aug, 07 Sept, 07 Oct, 07

Premier Homes

NON ZEH AVG BILL

Treasure Homes

Premier and Treasure Homes Avg monthly electric bills are 58% less than Non-Solar Homes.

Where We’re Headed

• CPUC and NAPEE goal of net-zero energy home by 2020

• Two projects to move toward true net-zero homes:– One Zero Energy Home (80% goal)– Project with PIER/SDG&E/SMUD to build

ZEH subdivisions

Current Energy Performance Goals

• Annual Source Energy: 80% Reduction

• Zero Net Summer Peak Electric Demand: 4 PM to 8 PM

• Demonstrate the features of the home to the public and builders

(2500 ft2 floor area target)

Base Energy Performance Specs• 2x6/R19-R21 cavity/R12 insulating sheathing (R30 wall assembly) • R50 12” low-density foam ceiling assembly

• Tight Envelope, .0002 SLA (4 ACH50), Third Party inspections & testing

• Low e/low SHGC glazing (0.3 U-value, 0.26 SHGC)• 100% CFL/LED Lighting• Evaporative Condenser with 15 EER and night ventilation (home); SEER 18/12.5 EER and

10 HSPF mini-split heat pump (apartment)• Solar assisted hot water and hydronic heating with 97% efficient gas boiler• Tested ducts inside conditioned space • Gas clothes dryer and Energy Star dishwasher, clothes washer, and washing machine• 3.86 kW AC PV with grid connected battery system • Home automation system with energy display, communicating T-stat, lighting controls• LEED Platinum

Estimated cost increase relative to standard home: +$20.00/ft2

Peak Demand: 4kWac West Array

HOF Electric Demand Reduction

-2

-1

0

1

2

3

4

5

1:00 7:00 13:00 19:00 1:00 7:00 13:00 19:00 1:00 7:00 13:00 19:00

July4-July 6 TMY Cooling Peak

Ho

url

y D

em

an

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kW

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T24

HOF

PIER/SDGE&/SMUD Project

• Scope of Work almost complete• Expect to build two subdivisions – one in San

Diego and one in the Sacramento area• Homes will contain—

– High efficiency windows, insulation, lighting, HVAC, water heating and appliances

– Photovoltaic arrays– Demand response enabled– Energy storage (in some cases)– V2G and V2H test

Our Hope

• Results from these projects will:– be replicable– expand our knowledge– set the stage for the next level ZEH– have nationwide impact