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COMPARISON OF ASHRAE
STANDARD-90.1, 189.1
AND IECC CODES
FOR LARGE OFFICE
BUILDINGS
IN TEXAS
Jaya Mukhopadhyay
Juan-Carlos Baltazar, Ph.D.
Hyojin Kim, Jeff S. Haberl, Ph.D., P.E.,
Cyndi Lewis, Bahman Yazdani, P.E.
Energy Systems Laboratory
Texas A&M University
20th October 2011
New York Energy Systems Laboratory
Texas A&M University System
October 2011
ESL-TR-11-10-10
STRUCTURE
BACKGROUND
METHODOLOGY
CLIMATE ZONE DECRIPTION
BASE CASE DESCRIPTION
RESULTS
SUMMARY
Energy Systems Laboratory 2011 2/30
ESL-TR-11-10-10
BACKGROUND
Codes compared:
ASHRAE 90.1-1989
ASHRAE 90.1-1999
ASHRAE 90.1-2004
ASHRAE 90.1-2007
IECC 2009
ASHRAE 90.1-2010
ASHRAE 189.1-2009
The purpose is to assess the
stringency of each code
ASHRAE 90.1-1989 selected as the
base-case
Energy Systems Laboratory 2011 3/30
ESL-TR-11-10-10
METHODOLOGY
Performance option outlined in the
codes used to design the base case
DOE-2.1e used for simulations
Analysis conducted for
Site energy usage
Source energy usage
Energy Systems Laboratory 2011 4/30
ESL-TR-11-10-10
CLIMATE ZONES
Three counties selected for analysis
Each county represents a climate zone
Harris (Climate Zone 2A)
Tarrant (Climate Zone 3A)
Potter (Climate Zone 4B)
The counties cover the major
population hubs in the state
5/30 Energy Systems Laboratory 2011
POTTER
TARRANT
HARRIS
ESL-TR-11-10-10
BASE-CASE
The input was categorized into the
following categories:
Program
Form
Fabric
Equipment
Energy Systems Laboratory 2011 6/30
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
FR
AC
TIO
N O
F O
CC
UP
AN
CY
HOUR OF DAY
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
FR
AC
TIO
N O
F O
CC
UP
AN
CY
HOUR OF DAY
ESL-TR-11-10-10
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
FR
AC
TIO
N O
F P
OW
ER
HOUR OF DAY
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
FR
AC
TIO
N O
F O
CC
UP
AN
CY
HOUR OF DAY
Operating Schedules
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
FR
AC
. O
F W
AT
ER
US
AG
E
HOUR OF DAY
BASE-CASE: Program
Schedules include:
Occupancy
Infiltration
Service hot water demand
Lighting
Equipment
HVAC system & fan
ASHRAE 90.1-1989 used as reference
Assumed same for all codes, except
ASHRAE 90.1-2010 equipment schedules
modified to reflect 50% of receptacle
outlets switched off when not in use
Energy Systems Laboratory 2011 7/30
OCCUPANCY
LIGHTING & EQUIPMENT
SHW USAGE
ESL-TR-11-10-10
BASE-CASE: Program
Space Temperatures 70°F for space heating
75°F for space cooling
Thermostat setback of 5°F
Energy Code Ver. of ASHRAE 62.1 cfm/per. cfm/sqft Resultant OA cfm
ASHRAE 90.1-1989 1981 5 - 1625
ASHRAE 90.1-1999 1989 20 - 6500
ASHRAE 90.1-2004 1999 20 - 6500
ASHRAE 90.1-2007 2004 5 0.06 6983
ASHRAE 90.1-2010 2007 5 0.06 6983
IECC 2009 2007 5 0.06 6983
ASHRAE 189.1-2009 2007 5 0.06 6983
+
Energy Systems Laboratory 2011 8/30
Ventilation Requirements Peak occupancy: 275 sq.ft. / person
ASHRAE 62.1 used to calculate the
ventilation requirements
ESL-TR-11-10-10
BASE-CASE: Form
Six story office building:
Footprint area: 14,884 sq.ft.
Total floor area: 89,304 sq.ft.
Floor to floor height: 13 ft.
Floor to ceiling height: 9 ft.
Window to wall area ratio: 40%
No shading except ASHRAE 189.1-2009
(PF for South: 0.50)
Aspect ratio:
For ASHRAE 90.1-1989: 2.5:1
For other models: 1.5:1
Four perimeter zones & core zone for each
floor: 15 ft. deep
Energy Systems Laboratory 2011 9/30
ESL-TR-11-10-10
BASE-CASE: Fabric
ASHRAE 90.1-1989 requires 0.038
cfm/sq.ft.
No specifications for whole building
infiltration in ASHRAE 90.1-1999, 2004,
2007 or IECC 2009
Air-barriers mandatory in the ASHRAE
90.1-2010 & ASHRAE 189.1- 2009
Energy Code Operating Hours
ACH
Non-Operating Hours
ACH
ASHRAE 90.1-1989 – 2007 & IECC 2009
Core Zones 0.043 0.170
Perimeter Zones 0.070 0.280
ASHRAE 90.1-2010 & 189.1-2009
Core Zones 0.0095 0.0375
Perimeter Zones 0.0155 0.0618
Infiltration
Energy Systems Laboratory 2011 10/30
Air Change method used
When HVAC system ON, infiltration
reduced by 75%
ESL-TR-11-10-10
BASE-CASE: Fabric
Building Envelope Characteristics Steel frame walls
Roof insulation entirely above metal deck
Slab-on-grade for the floor
Energy Systems Laboratory 2011 11/30
Climate Zone ASHRAE 90.1
1989
ASHRAE 90.1
1999
ASHRAE 90.1
2007
IECC
2009
ASHRAE 90.1
2010
ASHRAE
189.1
2009
Steel Frame Walls
2A R-6.5 R-13 R-13 R-13 R-13 R-13+R-5 c.i
3A R-6.5 R-13 R-13+R3.8 c.i R-13+R3.8 c.i R-13+R3.8 c.i R-13+R-5 c.i
4B R-16.5 R-13 R-13+R7.5c.i R-13+R7.5c.i R-13+R7.5c.i R-13+R10 c.i
Insulation Entirely Above Roof
2A R-13.5 c.i R-15 c.i R-20 c.i R-20 c.i R-20 c.i R-25 c.i
3A R-15.75 c.i R-15 c.i R-20 c.i R-20 c.i R-20 c.i R-25 c.i
4B R-15.5 c.i R-15 c.i R-20 c.i R-20 c.i R-20 c.i R-25 c.i
Metal Frame Window U-Value
2A U-1.15 U-1.22 U-0.75 U-0.75 U-0.75 U-0.75
3A U-1.15 U-1.22 U-0.65 U-0.65 U-0.65 U-0.65
4B U-0.81 U-0.46 U-0.55 U-0.55 U-0.55 U-0.45
Window SHGC
2A 0.61 0.17 0.25 0.25 0.25 0.25
3A 0.61 0.15 0.25 0.25 0.25 0.25
4B 0.61 0.25 0.40 0.40 0.40 0.40
Slab On Grade
2A N.R N.R N.R N.R N.R N.R
3A N.R N.R N.R N.R N.R N.R
4B N.R N.R N.R N.R N.R R-10 at 4ft.
Increase in Stringency
ESL-TR-11-10-10
BASE-CASE: Fabric
Roof & Wall Absorptance
Roof & Wall Emittance
Energy Systems Laboratory 2011 12/30
Energy Code Roof / Wall Absorptance
ASHRAE 90.1-1989
0.7 / 0.7 ASHRAE 90.1-1999
ASHRAE 90.1-2004
ASHRAE 90.1-2007
IECC 2009 0.75 / 0.75
ASHRAE 90.1-2010 CZ 2&3: 0.45 / 0.7
CZ 4 : 0.7 / 0.7
ASHRAE 189.1-2009 0.55 / 0.7
Energy Code Roof / Wall Emittance
ASHRAE 90.1-1989
0.9 / 0.9 ASHRAE 90.1-1999
ASHRAE 90.1-2004
ASHRAE 90.1-2007
IECC 2009 0.75 / 0.75
ASHRAE 90.1-2010 0.9 / 0.9
ASHRAE 189.1-2009
ESL-TR-11-10-10
Plug Loads
BASE-CASE: Equipment
Energy Code Lighting Power Density
(W/sq.ft.)
ASHRAE 90.1-1989 1.57
ASHRAE 90.1-1999 1.3
ASHRAE 90.1-2004 1
ASHRAE 90.1-2007 1
IECC 2009 1
ASHRAE 90.1-2010 0.9
ASHRAE 189.1-2009 0.9
Lighting Systems
0.75 W/ sq.ft. assumed across all the codes
Energy Systems Laboratory 2011 13/30
Daylight diming controls assumed for
ASHRAE 90.1-2010 and 189.1 codes
ESL-TR-11-10-10
BASE-CASE: Equipment
HVAC Systems – ASHRAE 90.1-1989
Office building > 75,000sqft or > 3 floors
SYSTEM 5
Specifications for SYSTEM 5
Built-up VAV w/ reheat
Supply fan static pressure – 4 in. w.c.
Total fan efficiency – 55%
Fan control –Variable speed drive
Cooling – Chiller
Heating – Hot water boiler
Energy Systems Laboratory 2011 14/30
ESL-TR-11-10-10
BASE-CASE: Equipment
HVAC Systems – ASHRAE 90.1-1999, 2004, 2007,
2010 & IECC 2009
Water Fossil Fuel
Energy Systems Laboratory 2011 15/30
Specifications for SYSTEM 2
Built-up VAV w/ reheat
Fan control –Variable speed drive
Cooling – Chiller
Heating – Hot water boiler
System 2
ESL-TR-11-10-10
BASE-CASE: Equipment
HVAC Systems –ASHRAE 189.1-2009
Energy Systems Laboratory 2011 16/30
Specifications for SYSTEM 7
VAV with perimeter reheat
Supply fan control – VAV
Cooling system – Chilled water
Heating system – Hot water fossil
fuel boiler
System 7
Office building > 75,000sqft or > 3
floors
SYSTEM 7
ESL-TR-11-10-10
ASHRAE 90.1 1999 Climate zone2A,3A,4B
To select type of fan Table 11.3.2A Budget System Descriptions, Note 4
Pick SV-A output report
From SVA report pick up: Cooling capacity Fan electricity usage To decide economizer and type of fan
To select economizer Table 6.3.1 Minimum System Size for which an Economizer is Required
Power > 25 HP?
Fan control: Inlet vane
Fan control type: Variable speed drive
No
Yes
Select SHW efficiency according to size. Table 7.2.2 Performance Requirements for Water Heating Equipment
Pick SS-P output report
From SS-P report Pick up size of SHW-heater to decide efficiency of SHW
No
Pick PV-A output report
From PV-A report Pick up size of equipment to decide number of chillers and boilers: - HW-BOILER -HERM-CENT-CHILLER
Calculation of chiller size Btu/hr/12000 = tons
Chiller size >300 tons?
Table 11.4.3B Number of chillers
# of chillers = 1
Chiller size >600 tons?
# of chillers = 2
# of chillers ≥ 2 ≤ 800tons
Select chiller type according to size of each chiller. Table 11.4.3C Water chillers types
Select chiller efficiency according to size of each chiller. Table 6.2.1C Water Chilling Packages - Minimum Efficiency Requirements
No
Yes
Yes
Calculation of boiler size Btu/hr
Boiler size >600 kBtu/hr?
Table 11.4.3A, Budget System Descriptions, Note 6
# of boilers = 1
# of boilers = 2
No
Yes
Select boiler efficiency according to size. Table 6.2.1F Gas and Oil-Fired Boilers, Minimum Efficiency Requirements
Start
RUN 1
Select base-case system
STOP RUN 2
ESL-TR-11-10-10
BASE-CASE: Equipment
Chillers & Boilers
Climate
Zone
ASHRAE 90.1
1989
ASHRAE 90.1
1999
ASHRAE 90.1
2007
IECC
2009
ASHRAE 90.1
2010
ASHRAE
189.1
2009
Chiller Type and Specifications
2A
Number: 1
Recip.
COP 3.8
Number: 1
Screw
COP 4.45
Number: 1
Screw
COP 4.45
Number: 1
Screw
COP 4.54
Number: 1
Screw
COP: 4.54
Number: 1
Screw
COP: 4.54
3A
Number: 1
Recip.
COP 3.8
Number: 1
Screw
COP 4.45
Number: 1
Screw
COP 4.45
Number: 1
Recip.
COP 4.54
Number: 1
Recip.
COP: 4.54
Number: 1
Screw
COP: 4.54
4B
Number: 1
Recip.
COP 3.8
Number: 1
Screw
COP 4.45
Number: 1
Screw
COP 4.45
Number: 1
Recip.
COP 4.54
Number: 1
Recip.
COP: 4.54
Number: 1
Screw
COP: 4.54
Gas Boiler Type and Specifications (Et % )
2A
3A
4B
Number: 1
80 %
Number: 2
80 %
Number: 2
80 %
Number: 2
75 %
Number: 2
80 %
Number: 2
89 %
Energy Systems Laboratory 2011 18/30
Increase in Stringency
ESL-TR-11-10-10
BASE-CASE: Equipment
Requirements for implementing
economizers more stringent with newer
versions of the codes
Trade-offs are provided in some codes by
increasing cooling efficiency
Economizers
Climate
Zone
ASHRAE 90.1
1989
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
2A × × × × ×
Diff. Enthalpy
Trade-off:
17%
×
3A × × × ×
Diff. Enthalpy
Trade-off:
15%
Diff. Enthalpy
Trade-off:
27%
Diff. Enthalpy
Trade-off:
15%
4B
(Note 1)
Diff. Drybulb
Fixed Drybulb
Fixed Drybulb
Diff. Drybulb
Diff. Drybulb
Diff. Drybulb
Diff. Drybulb
Min. Size
of System ≥ 65 kBtu/hr
≥ 65 kBtu/hr
Table 6.3.1
≥ 65 kBtu/hr
Table 6.5.1
≥ 65 kBtu/hr
Table 6.5.1
≥ 54 kBtu/hr
Table
503.3.1(2)
≥ 54 kBtu/hr
Table 6.5.1A
≥ 33 kBtu/hr
Table 7.4.3.4A
Energy Systems Laboratory 2011 19/30
ESL-TR-11-10-10
BASE-CASE: Equipment
Gas fired storage water heater with a hot
water recirculation loop
The gallons/hour per person required was
set at 0.4 gallons/hour
Assumed 100,000 Btu/hr input rating for
106 gallon tank
Standard Specifications Min. Specifications
ASHRAE 90.1 1989
Fuel Type: Gas
Storage Capacity: ≥ 100 gals
Input Rating: ≥75,000 Btu/hr
Et: 77%
SL: 1.3+38/V
All Other Codes
Et: 80%
SL: Q/800 + 110x(V)^0.5
Service Hot Water
Energy Systems Laboratory 2011 20/30
ESL-TR-11-10-10
BASE-CASE: Equipment
ASHRAE
90.1
1989
ASHRAE 90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE 90.1
2010
ASHRAE
189.1
2009
Fan Control
VSD ≥ 25 hp VSD
< 25 hp Inlet vane
≥ 5 hp VSD
Fan Specifications
Supply Total SP: 4 in wc
Eff.: 55%
For VAV fans
≥ 20,000cfm
1.5 hp/1000 cfm
For VAV fans
1.5 hp/1000 cfm
For VAV fans
1.35 hp/1000
cfm
Supply Air Fans & Fan Control
Energy Systems Laboratory 2011 21/30
Requirements more stringent with newer
versions of the codes
ESL-TR-11-10-10
BASE-CASE: Equipment
ASHRAE Standard 189.1-2009 requires
not less than 6 kBtu/sq.ft. of on-site
renewable energy
For the base case building of 89,304 sq.ft.
area: Annual on-site renewable energy
535.8 MMBtu
Several options available to generate this
amount of energy on-site:
Solar thermal systems
Photovoltaic systems
Renewable Energy Systems
Energy Systems Laboratory 2011 22/30
ESL-TR-11-10-10
Energy Systems Laboratory 2011
BUILDING ENERGY PERFORMANCE SUMMARY
(MMBtu)
DIFFERENCE w/ ASHRAE 90.1 1989
(%)
ASHRAE
90.1
1989
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
Climate Zone 2A
ELEC 4652.6 4045.5 3671.6 3570.3 3557.9 2683.8 2655.3 13.0 21.1 23.3 23.5 42.3 42.9
GAS 1262.8 884.9 924.3 607.1 640.0 681.0 485.8 29.9 26.8 51.9 49.3 46.1 61.5
TOTAL 5915.4 4930.3 4595.9 4177.3 4197.9 3364.8 3141.1 16.7 22.3 29.4 29.0 43.1 46.9
Climate Zone 3A
ELEC 4684.2 4034.7 3595.2 3541.7 3416.0 2610.8 2364.3 13.9 23.2 24.4 27.1 44.3 49.5
GAS 1634.5 1230.2 664.1 637.0 670.7 693.8 487.5 24.7 59.4 61.0 59.0 57.6 70.2
TOTAL 6318.6 5264.9 4259.1 4178.6 4086.5 3304.6 2851.8 16.7 32.6 33.9 35.3 47.7 54.9
Climate Zone 4B
ELEC 4385.7 3873.2 3516.3 3508.1 3495.4 2562.1 2349.3 11.7 19.8 20.0 20.3 41.6 46.4
GAS 1906.2 1246.1 1129.3 1015.0 1072.0 1078.3 695.1 34.6 40.8 46.8 43.8 43.4 63.5
TOTAL 6291.9 5119.2 4645.6 4523.1 4567.5 3640.3 3044.4 18.6 26.2 28.1 27.4 42.1 51.6
Energy Systems Laboratory 2011 23/30
RESULTS Site Energy Consumption
23/30
% Above ASHRAE 90.1 1989
Climate Zone 2A
0.0
1000.0
2000.0
3000.0
4000.0
5000.0
6000.0
7000.0
ASHRAE
90.1
1989
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
En
erg
y C
on
sum
pti
on
(M
MB
tu)
ELECTRICITY GAS TOTAL
16.7% 22.3% 29.4% 29.0% 43.1% 46.9%
ESL-TR-11-10-10
Energy Systems Laboratory 2011 24/30 Energy Systems Laboratory @2011
BUILDING ENERGY PERFORMANCE SUMMARY
(MMBtu)
DIFFERENCE w/ ASHRAE 90.1 1989
(%)
ASHRAE
90.1
1989
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
Climate Zone 2A
ELEC 4652.6 4045.5 3671.6 3570.3 3557.9 2683.8 2655.3 13.0 21.1 23.3 23.5 42.3 42.9
GAS 1262.8 884.9 924.3 607.1 640.0 681.0 485.8 29.9 26.8 51.9 49.3 46.1 61.5
TOTAL 5915.4 4930.3 4595.9 4177.3 4197.9 3364.8 3141.1 16.7 22.3 29.4 29.0 43.1 46.9
Climate Zone 3A
ELEC 4684.2 4034.7 3595.2 3541.7 3416.0 2610.8 2364.3 13.9 23.2 24.4 27.1 44.3 49.5
GAS 1634.5 1230.2 664.1 637.0 670.7 693.8 487.5 24.7 59.4 61.0 59.0 57.6 70.2
TOTAL 6318.6 5264.9 4259.1 4178.6 4086.5 3304.6 2851.8 16.7 32.6 33.9 35.3 47.7 54.9
Climate Zone 4B
ELEC 4385.7 3873.2 3516.3 3508.1 3495.4 2562.1 2349.3 11.7 19.8 20.0 20.3 41.6 46.4
GAS 1906.2 1246.1 1129.3 1015.0 1072.0 1078.3 695.1 34.6 40.8 46.8 43.8 43.4 63.5
TOTAL 6291.9 5119.2 4645.6 4523.1 4567.5 3640.3 3044.4 18.6 26.2 28.1 27.4 42.1 51.6
RESULTS Site Energy Consumption
% Above ASHRAE 90.1 1989
Climate Zone 3A
0.0
1000.0
2000.0
3000.0
4000.0
5000.0
6000.0
7000.0
ASHRAE
90.1
1989
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
En
erg
y C
on
sum
pti
on
(M
MB
tu)
ELECTRICITY GAS TOTAL
16.7% 32.6% 33.9% 35.3% 47.7% 54.9%
ESL-TR-11-10-10
Energy Systems Laboratory 2011 25/30 Energy Systems Laboratory @2011
BUILDING ENERGY PERFORMANCE SUMMARY
(MMBtu)
DIFFERENCE w/ ASHRAE 90.1 1989
(%)
ASHRAE
90.1
1989
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
Climate Zone 2A
ELEC 4652.6 4045.5 3671.6 3570.3 3557.9 2683.8 2655.3 13.0 21.1 23.3 23.5 42.3 42.9
GAS 1262.8 884.9 924.3 607.1 640.0 681.0 485.8 29.9 26.8 51.9 49.3 46.1 61.5
TOTAL 5915.4 4930.3 4595.9 4177.3 4197.9 3364.8 3141.1 16.7 22.3 29.4 29.0 43.1 46.9
Climate Zone 3A
ELEC 4684.2 4034.7 3595.2 3541.7 3416.0 2610.8 2364.3 13.9 23.2 24.4 27.1 44.3 49.5
GAS 1634.5 1230.2 664.1 637.0 670.7 693.8 487.5 24.7 59.4 61.0 59.0 57.6 70.2
TOTAL 6318.6 5264.9 4259.1 4178.6 4086.5 3304.6 2851.8 16.7 32.6 33.9 35.3 47.7 54.9
Climate Zone 4B
ELEC 4385.7 3873.2 3516.3 3508.1 3495.4 2562.1 2349.3 11.7 19.8 20.0 20.3 41.6 46.4
GAS 1906.2 1246.1 1129.3 1015.0 1072.0 1078.3 695.1 34.6 40.8 46.8 43.8 43.4 63.5
TOTAL 6291.9 5119.2 4645.6 4523.1 4567.5 3640.3 3044.4 18.6 26.2 28.1 27.4 42.1 51.6
RESULTS Site Energy Consumption
% Above ASHRAE 90.1 1989
Climate Zone 4B
0.0
1000.0
2000.0
3000.0
4000.0
5000.0
6000.0
7000.0
ASHRAE
90.1
1989
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
En
erg
y C
on
sum
pti
on
(M
MB
tu)
ELECTRICITY GAS TOTAL
18.6% 26.2% 28.1% 27.4% 42.1% 51.6%
ESL-TR-11-10-10
Energy Systems Laboratory 2011 26/30
BUILDING ENERGY PERFORMANCE SUMMARY
(MMBtu)
DIFFERENCE w/ ASHRAE 90.1 1989
(%)
ASHRAE
90.1
1989
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
Climate Zone 2A
ELEC 14655.7 12743.3 11565.5 11246.4 11207.4 8454.0 8364.2 13.0 21.1 23.3 23.5 42.3 42.9
GAS 1389.1 973.4 1016.7 667.8 704.0 749.1 534.4 29.9 26.8 51.9 49.3 46.1 61.5
TOTAL 16044.8 13716.7 12582.3 11914.3 11911.4 9203.1 8898.6 14.5 21.6 25.7 25.8 42.6 44.5
Climate Zone 3A
ELEC 14755.2 12709.3 11324.9 11156.4 10760.4 8224.0 7447.5 13.9 23.2 24.4 27.1 44.3 49.5
GAS 1798.0 1353.2 730.5 700.7 737.8 763.2 536.3 24.7 59.4 61.0 59.0 57.6 70.2
TOTAL 16553.2 14062.5 12055.4 11857.1 11498.2 8987.2 7983.8 15.0 27.2 28.4 30.5 45.7 51.8
Climate Zone 4B
ELEC 13815.0 12200.6 1076.3 11050.5 11010.5 8070.6 7400.3 11.7 19.8 20.0 20.3 41.6 46.4
GAS 2096.8 1370.7 1242.2 1116.5 1179.2 1186.1 764.6 34.6 40.8 46.8 43.8 43.4 63.5
TOTAL 15911.8 13571.3 12318.6 12167.0 12189.7 9256.7 8164.9 14.7 22.6 23.5 23.4 41.8 48.7
RESULTS Source Energy Consumption
Conversion from Site to Source Energy:
Electricity : 3.13 x Site Electricity Consumption
Source Natural Gas: 1.1 x Site Natural Gas Consumption
ESL-TR-11-10-10
Energy Systems Laboratory 2011 27/30
BUILDING ENERGY PERFORMANCE SUMMARY
(MMBtu)
DIFFERENCE w/ ASHRAE 90.1 1989
(%)
ASHRAE
90.1
1989
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
Climate Zone 2A
ELEC 14655.7 12743.3 11565.5 11246.4 11207.4 8454.0 8364.2 13.0 21.1 23.3 23.5 42.3 42.9
GAS 1389.1 973.4 1016.7 667.8 704.0 749.1 534.4 29.9 26.8 51.9 49.3 46.1 61.5
TOTAL 16044.8 13716.7 12582.3 11914.3 11911.4 9203.1 8898.6 14.5 21.6 25.7 25.8 42.6 44.5
Climate Zone 3A
ELEC 14755.2 12709.3 11324.9 11156.4 10760.4 8224.0 7447.5 13.9 23.2 24.4 27.1 44.3 49.5
GAS 1798.0 1353.2 730.5 700.7 737.8 763.2 536.3 24.7 59.4 61.0 59.0 57.6 70.2
TOTAL 16553.2 14062.5 12055.4 11857.1 11498.2 8987.2 7983.8 15.0 27.2 28.4 30.5 45.7 51.8
Climate Zone 4B
ELEC 13815.0 12200.6 11076.3 11050.5 11010.5 8070.6 7400.3 11.7 19.8 20.0 20.3 41.6 46.4
GAS 2096.8 1370.7 1242.2 1116.5 1179.2 1186.1 764.6 34.6 40.8 46.8 43.8 43.4 63.5
TOTAL 15911.8 13571.3 12318.6 12167.0 12189.7 9256.7 8164.9 14.7 22.6 23.5 23.4 41.8 48.7
RESULTS Source Energy Consumption
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
18,000
ASHRAE
90.1
1989
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
En
erg
y C
on
sum
pti
on
(M
MB
tu)
ELECTRICITY GAS
% Above ASHRAE 90.1 1989
Climate Zone 2A
14.5% 21.6% 25.7% 25.8% 42.6% 44.5%
ESL-TR-11-10-10
Energy Systems Laboratory 2011 28/30 Energy Systems Laboratory @2011
BUILDING ENERGY PERFORMANCE SUMMARY
(MMBtu)
DIFFERENCE w/ ASHRAE 90.1 1989
(%)
ASHRAE
90.1
1989
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
Climate Zone 2A
ELEC 14655.7 12743.3 11565.5 11246.4 11207.4 8454.0 8364.2 13.0 21.1 23.3 23.5 42.3 42.9
GAS 1389.1 973.4 1016.7 667.8 704.0 749.1 534.4 29.9 26.8 51.9 49.3 46.1 61.5
TOTAL 16044.8 13716.7 12582.3 11914.3 11911.4 9203.1 8898.6 14.5 21.6 25.7 25.8 42.6 44.5
Climate Zone 3A
ELEC 14755.2 12709.3 11324.9 11156.4 10760.4 8224.0 7447.5 13.9 23.2 24.4 27.1 44.3 49.5
GAS 1798.0 1353.2 730.5 700.7 737.8 763.2 536.3 24.7 59.4 61.0 59.0 57.6 70.2
TOTAL 16553.2 14062.5 12055.4 11857.1 11498.2 8987.2 7983.8 15.0 27.2 28.4 30.5 45.7 51.8
Climate Zone 4B
ELEC 13815.0 12200.6 11076.3 11050.5 11010.5 8070.6 7400.3 11.7 19.8 20.0 20.3 41.6 46.4
GAS 2096.8 1370.7 1242.2 1116.5 1179.2 1186.1 764.6 34.6 40.8 46.8 43.8 43.4 63.5
TOTAL 15911.8 13571.3 12318.6 12167.0 12189.7 9256.7 8164.9 14.7 22.6 23.5 23.4 41.8 48.7
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
18,000
ASHRAE
90.1
1989
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
En
erg
y C
on
sum
pti
on
(M
MB
tu)
ELECTRICITY GAS
RESULTS Source Energy Consumption
% Above ASHRAE 90.1 1989
Climate Zone 3A
15.0% 27.2% 28.4% 30.5% 45.7% 51.8%
ESL-TR-11-10-10
Energy Systems Laboratory 2011 29/30 Energy Systems Laboratory @2011
BUILDING ENERGY PERFORMANCE SUMMARY
(MMBtu)
DIFFERENCE w/ ASHRAE 90.1 1989
(%)
ASHRAE
90.1
1989
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
Climate Zone 2A
ELEC 14655.7 12743.3 11565.5 11246.4 11207.4 8454.0 8364.2 13.0 21.1 23.3 23.5 42.3 42.9
GAS 1389.1 973.4 1016.7 667.8 704.0 749.1 534.4 29.9 26.8 51.9 49.3 46.1 61.5
TOTAL 16044.8 13716.7 12582.3 11914.3 11911.4 9203.1 8898.6 14.5 21.6 25.7 25.8 42.6 44.5
Climate Zone 3A
ELEC 14755.2 12709.3 11324.9 11156.4 10760.4 8224.0 7447.5 13.9 23.2 24.4 27.1 44.3 49.5
GAS 1798.0 1353.2 730.5 700.7 737.8 763.2 536.3 24.7 59.4 61.0 59.0 57.6 70.2
TOTAL 16553.2 14062.5 12055.4 11857.1 11498.2 8987.2 7983.8 15.0 27.2 28.4 30.5 45.7 51.8
Climate Zone 4B
ELEC 13815.0 12200.6 11076.3 11050.5 11010.5 8070.6 7400.3 11.7 19.8 20.0 20.3 41.6 46.4
GAS 2096.8 1370.7 1242.2 1116.5 1179.2 1186.1 764.6 34.6 40.8 46.8 43.8 43.4 63.5
TOTAL 15911.8 13571.3 12318.6 12167.0 12189.7 9256.7 8164.9 14.7 22.6 23.5 23.4 41.8 48.7
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
18,000
ASHRAE
90.1
1989
ASHRAE
90.1
1999
ASHRAE
90.1
2004
ASHRAE
90.1
2007
IECC
2009
ASHRAE
90.1
2010
ASHRAE
189.1
2009
En
erg
y C
on
sum
pti
on
(M
MB
tu)
ELECTRICITY GAS
RESULTS Source Energy Consumption
% Above ASHRAE 90.1 1989
Climate Zone 4B
14.7% 22.6% 23.5% 23.4% 41.8% 48.7%
ESL-TR-11-10-10
SUMMARY Site vs. Source Energy Consumption
Energy Systems Laboratory 2011 30/30
Improvement over ASHRAE 90.1 1989:
SITE ENERGY SOURCE ENERGY
ASHRAE 90.1-1999 16.7%-18.6% 14.5%-15.0%
ASHRAE 90.1-2004 22.3%- 32.6% 21.6%-27.2%
ASHRAE 90.1-2007 28.1%-33.9% 23.5%-28.4%
IECC 2009 27.4%-35.3% 23.4%-25.8%
ASHRAE 90.1-2010 42.1%-47.7% 41.8%-45.7%
ASHRAE 189.1-2009 46.9%-54.9% 44.5%-51.8%
ESL-TR-11-10-10
Thank You!
Energy Systems Laboratory
Texas A&M University System
October 2011
ESL-TR-11-10-10
