Energy Efficiency in Buildings

Engineering for
Building Energy
qualification
Existing Buildings and New Construction

Michael Andelman, P.E.
Andelman and Lelek Engineering, Inc.

Introduction
?

?

Residential and commercialised buildings account for 40% of
energy use in U.S.; 70% of electric use focus will be on
commercial buildings
Initiatives to reduce building energy use
?

Existing Buildings
?
?
?
?

?

Energy Star
LEED EB
ASHRAE 100
service incentive programs

New Buildings
?
?
?
?

?

Energy Star
LEED NC
Federal Programs EPACT
State/ local Codes; Stretch Codes
Corporate / Institutional policies

EXISTING BUILDINGS

ENERGY closing USE
WHERE IS THE ENERGY GOING?
TOTAL ENERGY USAGE (SOURCE MMBtu)

sack Fans
17%
Area Lights
22%

Pumps & Aux.




10%

Heat Rejection
1%

Space
Cooling
8%
Space Heating
14%

Misc Equip
28%

 first-class honours degree cadence - Benchmarking
Energy Star Rating System
? ASHRAE Std 100 Energy Efficiency in
Existing Buildings
?

? Uses

CBECS 2003

Campus Benchmarking
CBECS BENCHMARK
Actual EUI (kBtu/sf-yr)

Benchmark EUI (kBtu/sf-yr)

143

143

142

101
78
65

62
48

41

48

65
48

40

60 65

78
65

75 78

78

 utility program Data Analysis
Annual Comparison
? Monthly Patterns
? Daily Patterns
?

Monthly utility program Use
Law School- Steam
4,000
3,500

MMBTU

3,000

2005

2006

2,500
2007

2,000

2008
2009

1,500
2010

1,000

2011
2012

500

0
Jan

Feb

Mar

Apr

May

Jun

Jul

Month

Aug

Sep

Oct

Nov

Dec

Daily Electric Use
Screen shot from First Fuel

Submeters

End Use Allocation
Submeters
? Predictors
? Energy Model
?

Lights
15%
Fans
68%

Equipment
4%
Cooling
1%
Heat Rejection
2%

Pumps & Aux.
10%

How to Save Energy
?

scummy Cost/ no cost Energy Conservation
Measures (ECMs)
? Turn

off lights/ equipment during slothful periods
? Change equipment setpoints based on weather/
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