Bronwyn Barry, CPHD One Sky Homes

Passive House California North American Passive House Network

GREENBUILD 2016

q  Where are we starting from?

q  How low must we go? q  How’s this being done?

q  Lessons Learned

q  CA homes use 31% less than the U.S. average

q  Expenditure for energy about

the same as U.S. average

q  62M BTU energy use per home = 18,170 kWh

q  Average size = 1,525 SF

q  60% Single Family Homes

Source: www.eia.gov/consumpion/residential

Energy use: 18,170 kWh/yr Ø  Assume: 400 kWh/panel Ø  12 kW PV Array Ø  = 45 panels!

Source: www.eia.gov/consumpion/residential

Min. Required Roof Area = 780 SF (Assuming 17.3 SF/panel)

Cars: 12%

Residential: 5.37%

COTTLE RESIDENCE

q  3,200 SF home (family of 5) q  28 PV Panels (6.2 kW) q  11,100 kWh production

PROJECT STATS

Co#le-CAClimateZone3

HDD/CDD 2335 574Area/TFA 3200SF 2776SFNetAnnualEnergyUse&ProducCon 9356kWh 11,100kWhPV 6.2kW

Gas/ElectricSplit

GasCooking,SolarHotWaterwithbackup

HVACsystems

HeatPump,NightBreezeCooling,SolarThermalHotWater,HRV

ASSEMBLIES (hr.ft2.F/BTU)

ROOF/CLG: R-38

T-24 REQ’D VS. AS-BUILT

R-50

WALLS: R-25 R-26

WINDOWS: U-0.38

FLOOR/SLAB: R-0 R-14

U-0.3

COPYRIGHT ONE SKY HOMES 2016 AFTER

BEFORE

SUNNYVALE

COPYRIGHT ONE SKY HOMES 2013

BEFORE

REVISIONS

1'-1

1"

23'-3 1/2"

9'-9

"

25'-1"

11'-8 1

/2"

6'-7" 33'-1"

10

'-4

"

13

'-4

"

46'-8"

4'-0"

22'-2 1/2"39'-2"

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1/4" = 1'-0"

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PROPOSED ELEVATIONS

Prelim WindowQuote 6.22.12

1/4" = 1'

FRONT - SOUTH EAST

SIDE - SOUTH WEST

SIDE - SOUTH EAST

REAR - SOUTH WEST

REVISIONS

1'-1

1"

23'-3 1/2"

9'-9

"

25'-1"

11'-8 1

/2"

6'-7" 33'-1"

10

'-4

"

13

'-4

"

46'-8"

4'-0"

22'-2 1/2"39'-2"

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Date

Scale

Drawn

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PROPOSED ELEVATIONS

Prelim WindowQuote 6.22.12

1/4" = 1'

FRONT - SOUTH EAST

SIDE - SOUTH WEST

SIDE - SOUTH EAST

REAR - SOUTH WEST

REVISIONS

1'-1

1"

23'-3 1/2"

9'-9

"

25'-1"

11'-8 1

/2"

6'-7" 33'-1"

10

'-4

"

13

'-4

"

46'-8"

4'-0"

22'-2 1/2"39'-2"

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Scale

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PROPOSED ELEVATIONS

Prelim WindowQuote 6.22.12

1/4" = 1'

FRONT - SOUTH EAST

SIDE - SOUTH WEST

SIDE - SOUTH EAST

REAR - SOUTH WEST

REVISIONS

1'-1

1"

23'-3 1/2"

9'-9

"

25'-1"

11'-8 1

/2"

6'-7" 33'-1"

10

'-4

"

13

'-4

"

46'-8"

4'-0"

22'-2 1/2"39'-2"

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Date

Scale

Drawn

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408-4

21-6

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Str

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PROPOSED ELEVATIONS

Prelim WindowQuote 6.22.12

1/4" = 1'

FRONT - SOUTH EAST

SIDE - SOUTH WEST

SIDE - SOUTH EAST

REAR - SOUTH WEST

AFTER COPYRIGHT ONE SKY HOMES 2013

PROJECT STATS

Sunnyvale-CAClimateZone3

HDD/CDD 2643 220Area/TFA 2000SF 1560SFNetAnnualEnergyUse&ProducCon 5,765kWh/yr none

Gas/ElectricSplitGasCooking,

DHW

HVACsystems

1tonFujitsuHP&

PanasonicBathFans,

HRV

ASSEMBLIES (hr.ft2.F/BTU)

ROOF/CLG: R-38

T-24 REQ’D VS. AS-BUILT

R-40

WALLS: R-25 R-26

WINDOWS: U-0.38

FLOOR/SLAB: R-0 R-24

U-0.3

Table 9: Annual Site and Source Energy Savings Normalize to TMY3 Source: http://www.nrel.gov/docs/fy15osti/63085.pdf

MEASURED SAVINGS: §  $499 per year energy cost §  40% Source Energy

ALAMO

PROJECT STATS

Alamo-CAClimateZone12

HDD/CDD 2602 1578Area/TFA 3000SF 2342SFNetAnnualEnergyUse&ProducCon 8,400 kWh13,785 kWhPV 7.5kW Gas/ElectricSplit AllElectric

HVACsystemsHeatPump,

HRV

ASSEMBLIES (hr.ft2.F/BTU) ASSEMBLIES (hr.ft2.F/BTU)

ROOF/CLG: R-38

T-24 REQ’D VS. AS-BUILT

R-46

WALLS: R-19 R-28

WINDOWS: U-0.57

FLOOR/SLAB: R-0 R-14

U-0.3

3200 3000 1560 15250

2000400060008000100001200014000160001800020000

Co,le Alamo Sunnyvale Av.CA

EnergyUse&FloorArea

EnergyUse

FloorArea

2.92 2.803.70

11.91

0.00

2.00

4.00

6.00

8.00

10.00

12.00

14.00

Co.le Alamo Sunnyvale Av.CA

EUI(kWh/sf.yr)

www.passivehousecal.org

0 1000 2000 3000 4000 5000

BERNSTEIN

MIGHTYHOUSE

CLARUMOFFICE

POESTREET

FIELD/CHIARELLO

STANFORDST

OXFORDST

TreatedFloorArea(>2)

Large

Average Size

Tiny

MIXED USE BLDG

SINGLE FAMILY HOME

COMMERCIAL OFFICE BLDG

SINGLE FAMILY HOME

SFH

SFH

0.00 5.00 10.0015.0020.0025.0030.0035.0040.0045.00

BERNSTEIN

MIGHTYHOUSE

CLARUMOFFICE

POESTREET

FIELD/CHIARELLO

STANFORDST

OXFORDST

Floor/Slab(hr.A2.F/BTU)

0.00 5.00 10.0015.0020.0025.0030.0035.0040.0045.00

BERNSTEIN

MIGHTYHOUSE

CLARUMOFFICE

POESTREET

FIELD/CHIARELLO

STANFORDST

OXFORDST

OverallWindow(hr.A2.F/BTU)

0.00 5.00 10.0015.0020.0025.0030.0035.0040.0045.00

BERNSTEIN

MIGHTYHOUSE

CLARUMOFFICE

POESTREET

FIELD/CHIARELLO

STANFORDST

OXFORDST

ExteriorWalls(hr.A2.F/BTU)

0.00 5.00 10.0015.0020.0025.0030.0035.0040.0045.00

BERNSTEIN

MIGHTYHOUSE

CLARUMOFFICE

POESTREET

FIELD/CHIARELLO

STANFORDST

OXFORDST

Roof(hr.A2.F/BTU)

Ø  Assemblies were all very similar, despite large floor area variation

Ø  All used simple forms and roof design Ø  None have an attached garage

Passive House Design-related observations:

Passive House & ASHRAE Std 55 – Thermal Comfort

NONE of our clients have asked us to lower their energy bills. ALL have asked for better comfort or to eliminate mold.

COPYRIGHT ONE SKY HOMES 2013

q  Windows (+ Shading) Matter q  Air sealing gets you half way there q  Roof Design and Form factor are HUGE q  Drive your own energy model!

THANK YOU!

Bronwyn Barry, CPHD One Sky Homes

www.passivehousecal.org www.naphnetwork.org