California (Home) Dreamin': The Passive House Path to NZE
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Bronwyn Barry, CPHD One Sky Homes Passive House California North American Passive House Network GREENBUILD 2016
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Transcript of California (Home) Dreamin': The Passive House Path to NZE
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"
1019 V
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y F
org
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rive
Sunnyv
ale
, C
A 9
4087
04.06.2012
CO
NT
AC
T:
Alle
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illila
nd
408-4
21-6
808
PR
OJE
CT
: N
ew
Hom
e @
Date
Scale
Drawn
Job
Sheet
Sheet D
esc
riptio
nD
esi
gn a
nd C
onstr
uctio
n b
y:
182
0 C
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Ave
nue
, S
an J
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Hig
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ance
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om
es
PR
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A4
CS
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# 8
226
52
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onesk
yhom
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SE
ZE
N S
TR
UC
TU
RA
L E
NG
INE
ER
ING
B. BARRY
1/4" = 1'-0"
408-4
21-6
808
Str
uct
ura
l Engin
eering b
y:
ON
E S
KY
HO
ME
S274 E
. H
am
ilton A
ve., S
te C
, C
am
pbell,
CA
95008
Vo
ice: 408-8
71-7
273 F
ax:
408-8
71-7
274
CO
NT
AC
T: B
rian M
oon, S
r. E
ngin
eer
Seze
nS
truct
ura
om
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"
1019 V
alle
y F
org
e D
rive
Sunnyv
ale
, C
A 9
4087
04.06.2012
CO
NT
AC
T:
Alle
n G
illila
nd
408-4
21-6
808
PR
OJE
CT
: N
ew
Hom
e @
Date
Scale
Drawn
Job
Sheet
Sheet D
esc
riptio
nD
esi
gn a
nd C
onstr
uctio
n b
y:
182
0 C
ottle
Ave
nue
, S
an J
ose
, C
A95125
Hig
h-P
erf
orm
ance
, Z
ero
-Energ
y H
om
es
PR
OP
OS
ED
ELE
VA
TIO
NS
A4
CS
LB
# 8
226
52
alle
n@
onesk
yhom
es.
com
SE
ZE
N S
TR
UC
TU
RA
L E
NG
INE
ER
ING
B. BARRY
1/4" = 1'-0"
408-4
21-6
808
Str
uct
ura
l Engin
eering b
y:
ON
E S
KY
HO
ME
S274 E
. H
am
ilton A
ve., S
te C
, C
am
pbell,
CA
95008
Vo
ice: 408-8
71-7
273 F
ax:
408-8
71-7
274
CO
NT
AC
T: B
rian M
oon, S
r. E
ngin
eer
Seze
nS
truct
ura
om
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"
1019 V
alle
y F
org
e D
rive
Sunnyv
ale
, C
A 9
4087
04.06.2012
CO
NT
AC
T:
Alle
n G
illila
nd
408-4
21-6
808
PR
OJE
CT
: N
ew
Hom
e @
Date
Scale
Drawn
Job
Sheet
Sheet D
esc
riptio
nD
esi
gn a
nd C
onstr
uctio
n b
y:
182
0 C
ottle
Ave
nue
, S
an J
ose
, C
A95125
Hig
h-P
erf
orm
ance
, Z
ero
-Energ
y H
om
es
PR
OP
OS
ED
ELE
VA
TIO
NS
A4
CS
LB
# 8
226
52
alle
n@
onesk
yhom
es.
com
SE
ZE
N S
TR
UC
TU
RA
L E
NG
INE
ER
ING
B. BARRY
1/4" = 1'-0"
408-4
21-6
808
Str
uct
ura
l Engin
eering b
y:
ON
E S
KY
HO
ME
S274 E
. H
am
ilton A
ve., S
te C
, C
am
pbell,
CA
95008
Vo
ice: 408-8
71-7
273 F
ax:
408-8
71-7
274
CO
NT
AC
T: B
rian M
oon, S
r. E
ngin
eer
Seze
nS
truct
ura
om
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"
1019 V
alle
y F
org
e D
rive
Sunnyv
ale
, C
A 9
4087
04.06.2012
CO
NT
AC
T:
Alle
n G
illila
nd
408-4
21-6
808
PR
OJE
CT
: N
ew
Hom
e @
Date
Scale
Drawn
Job
Sheet
Sheet D
esc
riptio
nD
esi
gn a
nd C
onstr
uctio
n b
y:
182
0 C
ottle
Ave
nue
, S
an J
ose
, C
A95125
Hig
h-P
erf
orm
ance
, Z
ero
-Energ
y H
om
es
PR
OP
OS
ED
ELE
VA
TIO
NS
A4
CS
LB
# 8
226
52
alle
n@
onesk
yhom
es.
com
SE
ZE
N S
TR
UC
TU
RA
L E
NG
INE
ER
ING
B. BARRY
1/4" = 1'-0"
408-4
21-6
808
Str
uct
ura
l Engin
eering b
y:
ON
E S
KY
HO
ME
S274 E
. H
am
ilton A
ve., S
te C
, C
am
pbell,
CA
95008
Vo
ice: 408-8
71-7
273 F
ax:
408-8
71-7
274
CO
NT
AC
T: B
rian M
oon, S
r. E
ngin
eer
Seze
nS
truct
ura
om
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
