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PASSIVE HOUSE
Eco Houses of Vermont, LLC
Presented by:
Chris WestCertified Passive House ConsultantPresident, PHAUS VtChair, HBRANV Green CouncilCertified Green Professional
A Quick Path to the Comprehensive Energy Plan’s Goals
Thanks to Margaret Cheney
•Moving the political agenda toward super energy efficient buildings•Pushing for Thermal Energy Taskforce legislation•Supporting RBES Code Compliance with teeth
•We need to all support Margaret and other politicians who are working on this issue!
Comprehensive Energy Plan
•Recommends that 100% of new homes built in 2030 be Net Zero Houses.
•30% of all new homes built to Net Zero by 2020.
Net Zero Goal: Two paths
Big Leaky House 40+ panels to get to Net Zero
Net Zero Goal and PH
+
Reasonable Sized PH A few PV panels
Home Building Energy Triangle
It’s the Recycling Triangle for Home Energy
1st Reduce Load
2nd Use as many as you can renewables
3rd Use fossil fuels sparingly if needed
Passive House: I’ve heard of that.
• One of the most sighted standards in the US
• Steadily gaining traction in the Building Industry as the Gold Standard for energy efficiency• Regularly sited in:• Journal of Light Construction• Green Building Advisor• DoE: Energy Star and Building
America• BBbD presentations
• Even ppl who don’t like it reference it!
PH: What is this mystical beast?
• Uses the apex of Building Science
• Developed in the 1990’s by Wolfgang Feist in Germany
• Imported to the us in 2005
• Spreading across the country and Vermont
• Influencing Building Standards in Vt and the US
How does it relate to other programs?
Energy Efficient Housing Concepts in the US:
Vermont Energy Code (RBES): required for all new construction
Energy Star 3.0: DoE Program (30% more efficient than Code)
Building America: DoE super energy savings Program (15% better than EStar)
Passive House: 90% more efficient than Code 70% more efficient than Energy Star
55% more efficient than Building America
Costs only max. of 15% more to build
Energy Usage Comparison
How does Passive House get there?
Passive House Energy Standard
• Heating Load (Site): 4.75 kBTU/SF/YR
• Cooling Load (Site): 4.75 kBTU/SF/YR
• Total Energy Demand (Source): 38 kBTU/SF/YR
• Air Tightness: .6 ACH @ 50pa
Passive House Concept
Controlling Heat Loss: Insulation
R58 WALLS
R90 CEILING
R60 SLAB
WINDOWS High Performance U value 0.16
High Solar Heat Gain
Passive House Concept
Controlling Heat Loss: Eliminate Thermal Bridging
Passive House Concept
Controlling Heat Loss: Airtight Envelope
0.6 @ ACH50
(Vermont Energy Code = 4 ACH50)
Passive House Concept
Capturing Heat Gains: People
Passive House Concept
Capturing Heat Gains: Solar Heat Gains
Passive House Concept
Controlling Gains Seasonally: Orientation and Windows
Passive House Concept
Providing Fresh Air: High Efficiency Heat Recovery Ventilation
Passive House Concept
Integrating all of these elements into one house
Passive House Concept
• High Efficiency Heat Recovery Ventilation• 0.75 w/cfm or less
• Triple glazed windows with thermally broken frames• R-value of 7.1 or better
• Use materials with low embodied energy• Foams only where you must
• Short runs for DHW• Compact building designs easier to hit PH
Standard
Passive House Results
• 90% reduction in heating and cooling loads when compared to Code
• 70%-80% reduction in total energy demand
• Superior indoor air quality
• Occupant comfort
• Lower annual energy costs
• Smaller carbon footprint
People say PH is expensive
Results from actual houses in Vermont:
Higher construction costs (10% to 15%)
Doesn’t cost more! Monthly savings from Day 1.
Much higher quality construction means more durable and therefore a better value over time.
What are we talking about?
What is the payback on a marble counter top?
Passive House Costs
Costs up to 15% more to build than conventional construction
Saves 90% on Heating and Cooling Bills
Cost Analysis
Leading the change in buildingJust by being there Passive House has:
• Set the bar higher for all building standards
• Taught builders and architects techniques that can be incorporated in “less” than Passive House projects
• Shown that the “too much” argument doesn’t float if monthly out of pocket is same!
• Given legislatures data on applying modern building science in actual homes
Vermont Case Study: HfH Charlotte
1,050 sq. feet interior space
Vermont Case Study: HfH Charlotte
Vermont Case Study: HfH Charlotte
Vermont Case Study: HfH Charlotte
Vermont Case Study: Mechanicals
Vermont Case Study: Sensor Data
Vermont Case Study: HVR Data
Vermont Case Study: Monthly Utility Bills
Includes Heating, Hot Water, Cooking, Lighting and all appliances.
Passive House Second Home
Passive House Second Home Performance
Passive House Performance Comparison to Energy Star
State of PH in Vermont
First PH in Vt finished 2011Current PH in Vt: 14
6 certified3 almost PH’s (failed ACH50)2 in design phase
More in the works!
1 ‘almost’ PH
What Do Passive Houses Look Like?
What Do Passive Houses Look Like?
What Do Passive Houses Look Like?
What Do Passive Houses Look Like?
What Do Passive Houses Look Like?
Conclusion
Passive House• High quality home• Healthier living environment• Slightly more expensive to build• Payback in 3 – 7 years (depending on
price rise)• Monthly cost is the same from day one!• 90% cheaper to live in (heating/cooling
bills)• High resale value expected• Zero energy home easily attainable
with PH
Visit a Passive House
International Passive House Days
http://www.passivehouse-international.org/index.php?group=1&level1_id=75&page_id=299&lang=de