Myths, Obstacles and Opportunities of Energy Efficiency in the Re-Use of Historic Buildings Sean...
-
Upload
adele-mason -
Category
Documents
-
view
214 -
download
0
Transcript of Myths, Obstacles and Opportunities of Energy Efficiency in the Re-Use of Historic Buildings Sean...
Myths, Obstacles and Opportunities of Energy
Efficiency in the Re-Use of Historic Buildings
Sean DennistonNew Buildings Institute
Project Analyst
National non-profit & think-tank working to improve the energy efficiency of commercial buildings.
Intro
The Goal
We don’t have time to give you a comprehensive guide to energy
efficiency in historic preservation, but we can give you a framework and point
you in the right direction.
Intro
Myths
Myth # 1:
All old buildings are inherently inefficient.
Myths
Myths
The Hidden Barn, Vancouver, WAThe Home of NBI
Myths
0
20
40
60
80
100
120
140
160
180
Mea
sure
d E
UI (
kbtu
/sf)
"The Barn" Certified Silver Gold Platinum
• NBI Study of the measured performance of 100 LEED buildings.
Myth # 2:
You have to replace those historic windows if you
want to be energy efficient.
Myths
Myths
Window Description U-Value R-Value
Loose: single glazed, no storm window 0.92 1.09
Double-glazed insulating wood sash, 1 over 1 0.49 2.04Double-glazed insulating vinyl sash & frame, 1 over 1 0.47 2.13
MythsWindow Description U-Value R-Value
Loose: single glazed, no storm window 0.92 1.09
Typical and tight: single-glazed, storm windows 0.51 1.96Single-glazed prime sash with low-e storm window 0.43 2.33
Double-glazed insulating wood sash, 1 over 1 0.49 2.04Double-glazed insulating vinyl sash & frame, 1 over 1 0.47 2.13
Myths
Yearly energy saving (on one 3’ x 5’ window): 625,922 BtuAnnual savings per window ( $0.95/therm): $9.65/ year_____________________________________________________Simple payback ($400 installed / $9.65 ): 41½ years!!
“OLD” WOOD WINDOW/REPLACEMENT WINDOW ENERGY ANALYSIS. -- Keith Haberern
Obstacles
IgnoranceObstacles
Ignorance
Obstacles
Ignorance
Obstacles MinimumBottom 35%Top 35%Maximum
Ignorance
• Mechanical Contractors are trained to minimize comfort complaints, not energy.
Obstacles
Ignorance
• Mechanical Contractors are trained to minimize comfort complaints, not energy.
• Many contractors and mechanical engineers don’t understand the latest techniques and approaches.
Obstacles
Ignorance
• Mechanical Contractors are trained to minimize comfort complaints, not energy.
• Many contractors and mechanical engineers don’t understand the latest techniques and approaches.
• Many consultants and mechanical engineers only understand how we build buildings now.
Obstacles
Obstacles The Code
The Code
• A building that meets code is not an efficient building.
Obstacles
The Code
Obstacles
The Code
• A building that meets code is not an efficient building.
• Code compliance can result in minimally efficient in-efficiency.Obstacles
Opportunities
Passive Strategies
Opportunities
Passive Strategies
1887: The cutting edge of Green Design.
Opportunities
Passive Strategies
1887: The cutting edge of Green Design.
Opportunities
Passive Strategies
• Minimized Glazing Area• Thermal Mass• Daylighting• Natural Ventilation
Opportunities
CommissioningOpportunities
ActualProposed
100%
50%
0%
-50%
-100%
Sav
ings
as
% o
f B
asel
ine
These buildings appear to usemore energy than the code baseline!
Opportunities
Commissioning
Embodied Energy
Opportunities
Opportunities
Embodied Energy
Opportunities
Embodied Energy
Opportunities
Embodied Energy
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Baseline Getting to 50 Getting to 75 Getting to 0
Operational
Embodied
Major Lessons
Major Lessons
• Many historic buildings were designed for energy efficiency, take advantage of it.
Major Lessons
• Many historic buildings were designed for energy efficiency, take advantage of it.
• Commissioning is vital.
Major Lessons
• Many historic buildings were designed for energy efficiency, take advantage of it.
• Commissioning is vital.• Expertise! Expertise! Expertise!
Thank youNew Buildings Institute
Sean [email protected]
www.newbuildings.orgwww.advancedbuildings.net
www.gettingto50.net