housing action illinois 2009 convention
TRANSCRIPT
Housing Action Illinois 2009 Greening Rehab
Alex FullerCenter for Neighborhood Technology
Craig MattesonARC Insulation, Inc.
• Energy audits, construction management, low-interest loan through CIC
• Multifamily building owners in private and subsidized markets
• 260 buildings, 9,000 units audited so far
• Measure impact of energy efficiency on affordability and housing preservation
Energy Savers Program
(a)Put up a wind turbine
(b) Install photovoltaic panels
(c) Literally go green
(d)Build your own nuclear power plant
(e) Insulate and air-seal
You want to go green.The first thing you should do is
The Nightmare Scenario:
An inefficient building that you try to run on renewable energy. First make the building burn as little fossil fuel as possible. Then go after renewable/sustainable/green/ clean/eco-friendly technology.
Measuring greenResidential Energy Services Network
(RESNET)
Leadership in Energy and Environmental
Design (LEED) Energy Star
0
30
60
90
120
4/1/07 7/1/07 10/1/07 1/1/08 4/1/08 7/1/08 10/1/08 1/1/09 4/1/09
Av
g k
Wh
/da
y
Electricity
0
40
80
120
160
4/1/07 7/1/07 10/1/07 1/1/08 4/1/08 7/1/08 10/1/08 1/1/09 4/1/09
Avg
the
rms/
da
y Heating load
Base load
Electricity
What’s important?
Electricity
Gas
Simplified House – A box of hot air in cold air
Hot
Cold
Cold
Conduction heat loss
Hot
Cold
Moral of the story:• Worse than you’d think. Low R-values disproportionately
drag down the overall R-value.• Heavily insulating one side is exponentially useless.• In an ideal world, insulate all sides evenly.
Area-weighted R-values
2
AA
1
AA
RR
overalltotal
2
total
1
1R
Convection heat loss
Air leaks in at the bottom
Air leaks out at the top
Somewhere in the middle, no air leakage
From Insulate and Weatherize by Bruce Harley:
Older homes usually had little or no insulation and were quite leaky. They are the basis for that pearl of wisdom “a house has to breathe”…One approach to dealing with this is a head-in-the-sand stance: Let’s not make this house “too efficient” in the hope that it will “breathe” and stay healthy.
Why make a house tight, and then spend money to ventilate it? Doesn’t it make more sense to just leave it a little bit leaky? The short answer is no. A leaky house experiences haphazard ventilation that may or may not be appropriate or adequate. A good ventilation system, on the other hand, allows you to control the introduction of fresh air into a home.
Air-sealing – Tedious but Important
Good books
Insulate and Weatherize by Bruce Harley
Residential Energy by Krigger and Dorsi
Mortgage Industry Nat’l Home Energy Rating Systems Standards
Where does your house fall?20
-29 30 40 50 60 70 80 90 100
110
120
130
140
150
160
170
180-
189
Energy use intensity (kBTU/sq ft/yr)
# bu
ildin
gs