mini-b passive house · passive house standard 1. heat loss demand = 4.75 kbtu/sf-yr 4. thermal...
TRANSCRIPT
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comfort - fresh air - affordabilitymini-B Passive House
SEATTLE CENTRAL COMMUNITY COLLEGE:
Frank Mestemacher - Carpentry Instructor
Carol Volpe – SCCC Curriculum Developer
Robert Natoli – SCCC BIT Instructor
Joel Bosshardt – SCCC BIT-WCC Liaison
Darlene Moore - SCCC student
VeraEve Giampietro – WCC & Graphics Support
INDUSTRY AND TRADE SPONSORS:
Tom Schneider - BEI Wet-Flash, Prosoco
Kevin Nolan - Vapro-Shield
Pat Nolan - Greenwood-Phinney Electric
Mike Fletcher - Georgia-Pacific DAP
Joe Beedy – Acrylitex Smooth Wall
Don Olsen & Eric Palmer
Painting Decorating & Drywall JATC
Mark Maher – Cement Masons & Plasters
Jim Charest – W. Washington Masonry Trades
Greg Hartman Illustrations
SUPER EFFICIENT SMALL DWELLING
Joseph Giampietro Architect & CPHC
www.miniBPassiveHouse.com
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Outline
1. Design Concept – Why a PH – DADU?
2. Passive House Challenges
3. Construction Process
4. Tested Results / Projected Energy Use
5. Lessons Learned – What works, or not
6. What next?
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1. Design Concept Drawings
COMFORTTemperature -- Radiation – Air Movement
FRESH AIRClean – Filtered – Draft Free
AFFORDABILITYFirst Cost – Life Cycle Cost -- Sustainable
Demonstrating Simple & Affordable Passive House(living in a warmer climate zone)
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Design Intent of Interior
Bed Loft - Kitchenette - ¾ Bath - 12 x 16 Living Area
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Passive House Standard1. Heat Loss Demand = 4.75 kBTU/sf-yr 4. Thermal Bridge Free Construction
(calculate negative & positive bridges)
“HEAT WITH A HAIR DRYER”
2. Primary Energy = 38.00 kBTU/sf-yr 5. Triple-Pane Glazing (recommended)
3. AIR TIGHT 6. HRV/ERV Efficiency = 75%+
Blower Door Test = 0.60 ACH50 (Heat/Energy Recovery Ventilation)
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2. PH Challenges
1. Envelope to Floor Area Ratio of 5.7:1 = High Heat Loss
2. Lots of penetrations relative to Floor Area = More Infiltration
3. Primary Energy Use – all the functions of a larger home
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Maxing Out the Options
1. Windows focused on south elevation – 43% of floor area
2. Thermal mass in concrete topping slab & 5/8 in GWB
3. Summer Shading to limit overheating
4. Evaluate Thermal Bridges of Intersections
5. Solar Hot Water Evacuated Tubes for Domestic Hot Water
6. No dishwasher – No Washer – No Dryer
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Thermal Bridge Inputs
Group # Qty
User
Deter-
mined
Length
[ft]
Subtrac-
tion
User-
Determin
ed
Length
[ft]
Length l
[ft]
Input of
Thermal
Bridge
Heat Loss
Coefficient
Y
[BTU/(hr.
ft.F)]
190deg wall
corner exterior21 4 7.40 29.60
90deg wall corner exterior
-0.050
2Roof Eave at
Wall21 1 38.00 38.00
Roof Eave at Wall-0.011
3Roof at Gable
End21 4 8.00 32.00
Roof at Gable End-0.050
4 Roof at Ridge 21 1 31.00 31.00 Roof at Ridge -0.026
5Perimeter at
Ground22 2 36.00 72.00
Perimeter at Ground-0.033
6
7
8
Therm Results for 2D Assembly Therm Results for Combined 1D Assemblies Resulting Psi
2D model 1D model A 1D model B Psi
U L dT ULdT error U L dT ULdT error U L dT ULdT error PsidT dT Psi
(Btu/h-f2F) (f) (F) (Btu/h-f) (%) (Btu/h-f2F) (f) (F) (Btu/h-f) (%) (Btu/h-f2F) (f) (F) (Btu/h-f) (%) (Btu/h-f) (K) (Btu/h-f-F)
90 degree corner at Mini-B 0.0202 5.75 36 4.1814 3.81 0.0208 4 36 2.9952 0.8 0.0208 4 36 2.9952 0 -1.809 36 -0.05025
Ridge of Roof 0.0232 6.089 36 5.085533 5.34 0.0193 4.348 36 3.0209904 2.04 0.0193 4.348 36 3.02099 2.04 -0.95645 36 -0.02657
Eave at Roof/Wall 0.0222 6.946 36 5.551243 3.31 0.0205 4 36 2.952 0.1 0.0208 4 36 2.9952 0.84 -0.39596 36 -0.011
Perimeter at Ground 0.0168 6.896 36 4.170701 9.9 0.0205 5.896 36 4.351248 0.61 0.0146 3.875 18 1.01835 4.76 -1.1989 36 -0.0333
6 in wall glazing
Light Shelf above Door 0.0481 6.156 36 10.65973 8.15 0.0189 0.5625 36 0.382725 na 0.11 1.519 36 6.01524 na -0.17092 36 -0.00475
and big windows 0.3 0.333 36 3.5964 na 0.023 1.01 36 0.83628 can be ignored
wind frame spacer
Thermal
Bridges
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Floor Portion of Perimeter Condition
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Wall Portion of Perimeter Condition
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Two D Therm Analysis – 0.033 BTU/hr.ft.F
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Temperature Gradient at Perimeter
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Wall Corner – 1 D Therm Result
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Wall Corner – 2 D Result – 0.050 BTU/hr.ft.F
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Wall Corner – Temperature Gradient
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Wall Corner – Energy Flow – 0.050 BTU/hr.ft.F
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Wall/Roof – Energy Flow – 0.011 BTU/hr.ft.F
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Roof Ridge – Energy Flow – 0.026 BTU/hr.ft.F
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Roof Ridge – Temperature Gradient
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Light Shelf – 2D Analysis +0.00475 BTU/hr.sf.F
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Thermal Bridge Inputs
Group # Qty
User
Deter-
mined
Length
[ft]
Subtrac-
tion
User-
Determin
ed
Length
[ft]
Length l
[ft]
Input of
Thermal
Bridge
Heat Loss
Coefficient
Y
[BTU/(hr.
ft.F)]
190deg wall
corner exterior21 4 7.40 29.60
90deg wall corner exterior
-0.050
2Roof Eave at
Wall21 1 38.00 38.00
Roof Eave at Wall-0.011
3Roof at Gable
End21 4 8.00 32.00
Roof at Gable End-0.050
4 Roof at Ridge 21 1 31.00 31.00 Roof at Ridge -0.026
5Perimeter at
Ground22 2 36.00 72.00
Perimeter at Ground-0.033
6
7
8
Therm Results for 2D Assembly Therm Results for Combined 1D Assemblies Resulting Psi
2D model 1D model A 1D model B Psi
U L dT ULdT error U L dT ULdT error U L dT ULdT error PsidT dT Psi
(Btu/h-f2F) (f) (F) (Btu/h-f) (%) (Btu/h-f2F) (f) (F) (Btu/h-f) (%) (Btu/h-f2F) (f) (F) (Btu/h-f) (%) (Btu/h-f) (K) (Btu/h-f-F)
90 degree corner at Mini-B 0.0202 5.75 36 4.1814 3.81 0.0208 4 36 2.9952 0.8 0.0208 4 36 2.9952 0 -1.809 36 -0.05025
Ridge of Roof 0.0232 6.089 36 5.085533 5.34 0.0193 4.348 36 3.0209904 2.04 0.0193 4.348 36 3.02099 2.04 -0.95645 36 -0.02657
Eave at Roof/Wall 0.0222 6.946 36 5.551243 3.31 0.0205 4 36 2.952 0.1 0.0208 4 36 2.9952 0.84 -0.39596 36 -0.011
Perimeter at Ground 0.0168 6.896 36 4.170701 9.9 0.0205 5.896 36 4.351248 0.61 0.0146 3.875 18 1.01835 4.76 -1.1989 36 -0.0333
6 in wall glazing
Light Shelf above Door 0.0481 6.156 36 10.65973 8.15 0.0189 0.5625 36 0.382725 na 0.11 1.519 36 6.01524 na -0.17092 36 -0.00475
and big windows 0.3 0.333 36 3.5964 na 0.023 1.01 36 0.83628 can be ignored
wind frame spacer
Thermal
Bridges
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3. Construction Team
WCC - Seattle Central
Community College
Frank Mestemacher
Carpentry InstructorSouth Seattle Community College
Georgetown Campus
In Association with the SCCC
Business Information Technology
Department – Robert Natoli
Instructor
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BEI Training for R-Guard Installation
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BEI Joint/Seam Filler at window joint
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Cat-5 Wall Treatment at Window
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Cat-5 Wall Treatment at North Wall
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Floor Framing in place
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Walls up – ready for Roof
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BEI - Prosoco - EnvelopeAir Tight Layer – 0.60ACH50Will STUDENTS pass the test?
R-Guard / Wet-Flash Products
Fast Flash – window wrap
Joint/Seam Filler – cracks/joints
Cat-5 - Weather Resistive Barrier
Air Dam – window caulking
1 - VAPOR PERMEABLE
2 - SELF - HEALING
3 - AIR BARRIER
Seals pipe & electrical
penetrations
Exterior sheathed & weather sealed
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Window Install with Air Dam
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EPS continuous exterior insulation
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Closing in the “Beer Cooler”
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Vapro-Shield over EPS Insulation
“Slope Shield” on the Roof
“Wall Shield” on Walls
Sheds Water
Vapor Permeable
Serious 925 Windows
U-11 Glazing
U-18 Assembly
1x4 Cedar Furring Straps(secured with 12 SIPS screws)
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Summer Siding (& Roofing) Crew
Hardie Panel 12-inch Exposure
Over Vented Rain Screen Air Gap
5/4 by 10 Cedar Trim
Champion Standing Seam
Metal Roofing (over 1x4 furring)
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Summer crew enjoying the view
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Insulation & Drywall Finish
Inside GP paperless drywall completes the Insulation Sandwich = R-53
3.5-inches of Blown-in Fiberglass & 9-inches of EPS foam
Continuous Ext. Insulation
equals
No Thermal Bridging
Paperless Drywall by GP
equalsNo Mold Potential (on GWB)
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Plumbing & Electrical in stud walls
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With Blown-in-Blankets
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w/ Wall Board & floor prepped for concrete topping
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Crew ready the Blower Door test
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Is the door well sealed?
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16 cfm = 0.38 ACH50
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4. Design Energy Use / Tested Results
Blower Door Test #1 0.58 ACH50 (at framing stage)
Blower Door Test #2 0.38 ACH50 (finished)
2009 WA Energy Code .Roof R-38Walls R-21Floor R-30Windows U-0.30Airtightness 5.25 ACH50 .Total Heat Demand / Year = 10,320 kBTU
at Seattle City Light rate = $ 240.00
Mini-B Passive House .Roof R-53Walls R-53Floor R-74Windows U-0.18Airtightness 0.60 ACH50 .Total Heat Demand / Year = 1,256 kBTU
at Seattle City Light rate = $ 30.00
COMFORTFRESH AIRLONG TERM AFFORDABILITY
“HEAT WITH A HAIR DRYER”
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PHPP Data Points/ResultsSpecific Heat Demand:
(Monthly) kBTU/(sf.yr)As Pre-approved 4.55Re-Submitted 10/9 4.34With tested ACH50 4.09
Freq. of Overheating 4%Aver. Shading Reduc. 50%Spec. Capacity Factor 18
(range is 11-36)
Window Heat Loss 53%Wall Heat Loss 32%Roof Heat Loss 20%Ground Heat Loss 7%Total Heat Loss 112%Neg Thermal Bridges 12%
Transmission Heat Losses 19.98Ventilation Heat Losses 2.91Total Heat Losses 22.89
Avail. Solar Heat Gain 22.30Internal Heat Gain 3.88Free Heat 26.18
Utilization Factor 71%(Monthly)
Net Monthly Heat Demand 4.34
Spec. Energy Demand 37.1Refrigerator 345 kWhr/yrTotal Electricity 634 kWhr/yr
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5. Lessons Learned
A. mini-B requires full solar exposure
B. Would build one foot smaller in heightto minimize cost of transport
C. Need a smaller (less expensive) ERV
D. Mineral Wool Fiber vs. EPS
E. Therm analysis made an 11% difference
F. It takes a big effort to go mini
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6. Where do we go from here?
Phinney Neighborhood Association – North Seattle!(after 6-months Mini-B will be for sale as a Backyard Cottage)
www.passivehouse.us www.passivehouse.com www.passivehouse-international.orgwww.phnw.org www.minibpassivehouse.com www.passivehouseprojects.wordpress.com
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comfort - fresh air - affordabilitymini-B Passive House
SEATTLE CENTRAL COMMUNITY COLLEGE:
Frank Mestemacher - Carpentry Instructor
Carol Volpe – SCCC Curriculum Developer
Robert Natoli – SCCC BIT Instructor
Joel Bosshardt – SCCC BIT-WCC Liaison
Darlene Moore - SCCC student
VeraEve Giampietro – WCC & Graphics Support
INDUSTRY AND TRADE SPONSORS:
Tom Schneider - BEI Wet-Flash, Prosoco
Kevin Nolan - Vapro-Shield
Pat Nolan - Greenwood-Phinney Electric
Mike Fletcher - Georgia-Pacific DAP
Joe Beedy – Acrylitex Smooth Wall
Don Olsen & Eric Palmer
Painting Decorating & Drywall JATC
Mark Maher – Cement Masons & Plasters
Jim Charest – W. Washington Masonry Trades
Robert
Greg Hartman Illustrations
SUPER EFFICIENT SMALL DWELLING
Joseph Giampietro Architect & CPHC
www.miniBPassiveHouse.com