Post on 28-Nov-2014
description
Half-Assive or Fully-Passive Talking chicken about Passivhaus and how it works in California
Bronwyn Barry, Assoc. AIA, CPHC One Sky Homes & Passive House BB PHCA President 2012
A Passivhaus overview How does it stack up?
California Projects A few lessons learned
Details, details, details Why chicken?
What’s on the menu
Super-insulated Airtight
No Thermal Bridges Comfortable
Very efficient
Passivhaus Overview
(This drawing by Dan Johnson)
Efficient compared to what?
Source: Numbers given by Mike Eliason on Bruteforcecollaborative Blog post
And what about Title 24?
0
10
20
30
40
50
60
70
80
Windows Walls Roof Floor Total
Typical T-24 Project R-value (hr.ft2°F/BTU.in)
PH Project R-value (hr.ft2°F/BTU.in)
Source: Values based on PHPP for one project in Albany, CA, 2010, by Bronwyn Barry, CPHC.
Who’s building this in CA? Retrofits:
O’Neil Res, Sonoma
CLAM 1, Point Reyes James Res, Marin
Tahan Res, Berkeley
Other retrofits underway in: Oakland, Portola Valley, Sunnyvale, Santa Rosa, Los Angeles, Santa Cruz and more…
Who’s building this in CA? New Construction:
Zen Center, Muir Beach
Zero Cottage, SF Pomona St, Albany
Lemon St, Menlo Park Cottle Res, San Jose CLAM 2, Point Reyes
Project Green Home, Palo Alto
• ‘Outsulate’ your walls for best forgiveness factor and performance
• Use triple-pane windows (for now) • Foundation insulation is key • Edge of slab insulation is critical • Overheating is our biggest issue • Religion relies on faith, everyone
else bring data! (With thanks to Danny Parker)
A few lessons learned
THERM is wonderful (and free)
The details matter
And flashing is still important
But the basics remain
And the results are in
LBNL Study monitored Ten Deep Energy Retrofits
(Including two PH projects)
Both found to perform
AS PREDICTED
Source: Brennan Less & Jeremy Fischer Lawrence Berkeley National Labs
So can we now talk turkey?
Illustrations by Bronwyn Barry for The Essential Urban Farmer, written by Novella Carpenter and Willow Rosenthal and published by Penguin in Dec. 2011
Where to learn more
www.passivehousecal.org THANK YOU Bronwyn Barry, Assoc. AIA, CPHC One Sky Homes & Passive House BB PHCA President 2012