Cynthia Lewis, Manager, Energy Systems Laboratory, Texas Engineering Experiment Station Presentation

1. ENERGY CODES IN TEXAS
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2011 ESL Presentations
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2. Energy Codes in Texas
• ESL’s role in TBEPS Adoption Process
(SECO- Rulemaking)
• 2009 IECC Analysis for Texas
Jurisdictions
• What about 2012?
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3. Texas Building Energy Codes
SB 12/HB 3693-2007
 Amended Chapter 388:
 Delegated SECO the authority to adopt by rule the latest
published editions of:
 Energy requirements (Chapter 11) International Residential
Code (IRC) for single-family construction.
 International Energy Conservation Code (IECC) for other
residential and commercial construction.
 ESL reviews latest ICC editions to ensure stringency of
the IRC and IECC compared to current adopted statewide
energy codes.
 Provides SECO a written recommendation based on
analysis and public review.
 Cities can continue to adopt local amendments
 Review by the Energy Systems Laboratory (ESL) of the
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Texas A&M University
ESL- 2011 Texas Jurisdictions

4. Texas Building Energy Codes
ICC Published New IECC-IRC
In 2009 ICC published new editions, triggering the SECO
review and energy codes update process:
 January: IECC 2009 edition published
 March: IRC 2009 edition published
 May: Initial 30 days comment period on IECC
 all comments were provided to ESL for a recommendation to
SECO
 July: initial 30 days comment period on IRC
 all comments were provided to ESL for a recommendation to
SECO.
 September: ESL recommended SECO the adoption
Energy
of Chapter 11 of the 2009 IRC and 2009 IECC
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ESL- 2011 Texas Jurisdictions

5. Texas Building Energy Codes
SECO Rulemaking
 January-2010: stakeholder meeting held to gain input
prior to draft rule publication.
 March 2010: draft rule published for 30 days
comment.
 1,057 sets of comments received
 Elected officials, trade associations, builders, architects,
environmental advocates
 June-2010: final rule published
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6. Texas Building Energy Codes
Final Rule: §19.53.Building Energy Efficiency Performance
Standards
(a) Single-family residential construction. Effective
January 1, 2012, the energy efficiency provisions
(Chapter 11) of the International Residential Code as they
existed on May 1, 2009, are adopted as the energy code in
this state for single-family residential construction as it is
defined in Health and Safety Code, §388.002(12).
(b) All other residential, commercial, and industrial
construction. Effective April 1, 2011, the International
Energy Conservation Code as it existed on May 1, 2009, is
adopted as the energy code for use in this state for all
residential, commercial, and industrial construction that is not
single-family residential construction under subsection (a) of
this section.
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7. 2010 Texas Jurisdiction Energy Code Adoption Survey
In February, 2010, The Energy Systems Laboratory at Texas A&M University conducted a Code
Survey of Texas Jurisdictions having populations greater than 25,000. The results for Energy
Code Adoption are as follows: 17 Texas cities had adopted the 2009.
City Code Year Flower Mound 2006 Missouri City 2006
Abilene 2000 Fort Worth 2003 Nacogdoches 2006
Addison 2006 Friendswood 2009 New Braunfels 2006
Allen 2006 Frisco 2006 North Richland Hills 2000
Amarillo 2006 Galveston 2009 Odessa 2006
Angleton None Garland 2003 Paris 2000
Arlington 2003 Georgetown 2000 Pasadena 2006
Austin 2009 Grand Prairie 2003 Pearland 2006
Baytown 2006 Grapevine 2000 Pflugerville 2006
Beaumont 2009 Greenville 2006 Pharr 2003
Bedford 2000 Haltom City 2003 Plano 2006
Big Spring 2006 Harker Heights 2009 Port Arthur 2006
Borger 2000 Harlingen 2006 Richardson 2006
Rockwall 2006
Brownsville 2006 Houston 2006
Rosenberg 2006
Bryan 2003 Huntsville 2003
Round Rock 2006
Burleson 2006 Hurst 2003
Rowlett 2006
Carrollton 2006 Irving 2006
San Angelo 2009
Cedar Hill 2006 Keller 2006
San Antonio 2009
Cedar Park 2009 Killeen 2006
San Benito 2009
Cleburne 2003 Kingsville 2000
San Juan 2006
College Station 2009 Kyle 2000
San Marcos 2003
Conroe 2000 La Porte 2006
Schertz 2006
Coppell 2006 Lake Jackson 2006
Seguin 2006
Copperas Cove 2000 Lancaster 2003
Sherman 2006
Corpus Christi 2003 Laredo 2009
Socorro 2003
Corsicana 2009 League City 2006
Southlake 2006
Dallas 2006 Leander 2009 Sugar Land 2003
Deer Park 2006 Lewisville 2006 Temple 2006
Del Rio 2003 Longview 2003 Texarkana 2004
Denton 2006 Lubbock 2000 Texas City 2006
Desoto 2003 Lufkin None The Colony 2006
Devine 2003 New Braunfels 2006 Tyler 2006
Duncanville 2006 Mansfield 2006 Victoria 2000
Eagle Pass 2009 McAllen 2006 Waco 2009
Edinburg 2006 McKinney 2006 Waxahachie 2006
El Paso 2009 Mesquite 2006 Weatherford 2003
Euless 2003 Midland 2009 Weslaco 2003
Farmers Branch 2006 Mission None Wichita Falls 2006
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8. 2011 Texas Jurisdiction Energy Code Adoption Survey
In February, 2011, The Energy Systems Laboratory at Texas A&M University conducted a Code
Survey of Texas Jurisdictions having populations greater than 25,000. The results for Energy
Code Adoption are as follows: 26 Texas cities had adopted the 2009.
City Code Year
Abilene 2000
Addison 2006
Allen 2006
Amarillo 2006
Angleton None
Arlington 2003
Austin 2009
Baytown 2006
Beaumont 2009
Bedford 2000
Big Spring 2009
Borger 2000
Brownsville 2006
Bryan 2003
Burleson 2006
Carrollton 2009
Cedar Hill 2006
Cedar Park 2009
Cleburne 2003
College Station 2009
Conroe 2000
Coppell 2006
Copperas Cove 2000
Corpus Christi 2003
Corsicana 2009
Dallas 2006
Eagle Pass 2009
Edinburg 2006
El Paso 2009
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9. ESL- Technical Support to Texas Jurisdictions
Typical Amendment Review Request
To: Energy Systems Laboratory
The City of Houston is adopting both the 2007 ASHRAE and 2009 IECC
for use in the jurisdiction and have worked to correlate them in the
amendments. Attached is the amendment package for the ASHRAE
document with the IECC amendments to follow imminently.
Please review and respond at your earliest convenience.
Respectfully,
Sheila W. Blake CBO, MBA, LEED®AP
Assistant Director-City of Houston Code Enforcement
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10. ESL- Technical Support to Texas Jurisdictions
Amendment Review Example
This change is recommended to mandate that cool roofs are required for low-slope roofs.
This language was previously added in the prescriptive method only; but should be required for all
compliance paths.
5.4.3.5 Cool roofs. Low slope roofs up to 2:12 shall be provided with a roof covering where the exterior
surface has:
(a) a minimum total solar reflectance of 0.70 when tested in accordance with one of the solar reflectance test
methods listed below, and
(b) a minimum thermal emittance of 0.75 when tested in accordance with one of the thermal emittance test
methods listed below.
Solar Reflectance Test Methods: ASTM C1549, ASTM E903, ASTM E1175, or ASTM E1918.
Thermal Emittance Test Methods: ASTM C835, ASTM C1371, or ASTM E408.
5.5.3.1.1Cool roofs. Low slope roofs up to 2:12 shall be provided with a roof covering where the exterior
surface has:
(a) a minimum total solar reflectance of 0.70 when tested in accordance with one of the solar reflectance test
methods listed below, and
(b) a minimum thermal emittance of 0.75 when tested in accordance with one of the thermal emittance test
methods listed below.
Solar Reflectance Test Methods: ASTM C1549, ASTM E903, ASTM E1175, or ASTM E1918.
Thermal Emittance Test Methods: ASTM C835, ASTM C1371, or ASTM E408.
ESL Comment (7/22/08): This change adds stringency because it is being moved from the
prescriptive section to the mandatory section, thus requiring this for all options. IECC 2001 does not
appear to give roof reflectance or emittance requirements.
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11. ESL working with Texas cities…….
With each newly adopted code, the ESL provides an analysis and
develops a report which presents detailed information about the
recommendations for achieving 15% above-code energy performance.
The current analysis is:
• based on the 2009 International Energy Conservation Code (IECC)
• performed for each Texas climate zone
• provides simple payback calculations
• provides total source energy savings from
heating, cooling, lighting, equipment, and DHW
• determines associated emissions reductions
This information is useful to homebuilders, utility demand side energy
managers, homeowners and others who wish to construct residential
buildings that exceed the minimum national energy code requirements
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12. Energy SUPPORT TO TEXAS JURISDICTIONS
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13. El Paso - Climate Zone 3
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14. Sample of Texas 2009 IECC Analysis
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15. Energy
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16. Sample of Texas 2009 IECC Analysis
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17. 15% Above-Code Savings in Climate Zone 3
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20. Energy
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Broken down into Heat Pump or Natural Gas
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21. Energy
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Combinations of measures….
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22. Energy
…with % savings and simple payback…
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23. …and emissions reductions calculations…
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24. Simplified combinations of measures to achieve
15% above the 2009 IECC!
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26. What about the 2012 IECC?
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27. Current project for City of Arlington, Texas
Arlington, Texas funded ESL to perform a
customized analysis to help develop local
amendments based on regional and
historical data………
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28. Arlington, Texas Project
This project is based on goal to determine
impact of moving from the 2003 IECC to the
2009 IECC!
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29. Arlington, Texas Project
Reviewed 2 years of permit data to document
most commonly used EE practices
Determined which practices made most impact
through modeling and simulation runs
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30. Arlington, Texas Project
Compared all individual measures against 2003
IECC to determine above-code savings
Combined groups of “best” measures based on
source/site energy savings, marginal/new
system cost, simple payback and emissions
savings
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31. Arlington, Texas Project
Series of stakeholder task force meetings to
review ESL analysis
Combined ESL/Task Force Final Report and
Recommendations brought before City Council
for final adoption decision
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32. Proposed Energy Efficiency Measures (EEMs)
2009 IECC Code-Compliant House with Heat Pump Heating
Description of Individual Measures
Annual Energy Savings Annual
Estim ated Cost ($)
(%) 1 Energy Sim ple Estim ated
Individual Measures
Savings Payback (yrs)
Site Source Marginal Cost 3 New System Cost 4
($/year) 2
A Envelope and Fenestration Measures
1 Radiant Barrier in Attics (w ith Ducts in Attics) 1.8% 1.8% $45 $300 - $880 6.6 - 19.5
2 Sealed (Unvented) Attic 4.0% 4.0% $103 $2,000 - $3,500 19.4 - 33.9
3 Window Shading (None to 2 ft. Eaves on All Sides) 2.1% 2.1% $55 $800 - $1,000 14.6 - 18.2
Window Shading and Redistribution (22.6% Equal Window s on All Sides w ith No
4 2.9% 2.9% $74 $800 - $1,000 10.8 - 13.5
Shading to S=40.7%, N=22.6%, E/W = 13.6% w ith 2ft. Eaves on All Sides)
5 Decreased Window SHGC (from .3 to .2) 2.0% 2.0% $52 $200 - $400 3.9 - 7.8
6 Decreased Window U Value (from .5 to .3) 3.8% 3.8% $97 $600 - $900 6.2 - 9.3
7 Decreased Window SHGC & U Value (from .3 to .2 SHGC & from .5 to .3 U-Value) 5.6% 5.6% $142 $900 - $1,100 6.3 - 7.8
B HVAC System Measures
8 Relocate Mechanical Systems w ithin Conditioned Space 6.3% 6.3% $161 $1,000 - $7,000 6.2 - 43.4
9 Improved Heat Pump Efficiency (from 13 to 15 SEER and from 7.7 to 8.5 HSPF) 6.7% 6.7% $171 $1,200 - $2,500 7.0 - 14.6
C Dom estic Hot Water Measures
13 Solar Domestic Hot Water System (32 sq. ft. collector, 65 gal tank) 7.6% 7.6% $193 $2,200 - $3,000 11.4 - 15.6
14 Solar Domestic Hot Water System (64 sq. ft. collector, 80 gal tank) 9.7% 9.7% $246 $3,200 - $4,000 13.0 - 16.3
D Lighting Measures Arlington, TX in Tarrant County
15 75% Energy Star Permanent CFL or Fluorescent Indoor Lamps 4.3% 4.3% $110 $25 - $110 0.2 - 1.0 IECC 2009 – Climate Zone 2
16 100% Energy Star Permanent CFL or Fluorescent Indoor Lamps 8.8% 8.8% $226 $50 - $215 0.2 - 1.0 IECC 2009 – Climate Zone 3
E Renew able Pow er Measures
17 4 kW Photovoltaic Array 27.1% 27.1% $692 $20,000 - $30,000 28.9 - 43.3 IECC 2009 – Climate Zone 4
Description of Com bined Measures
Annual Energy Savings Com bined Com bined Estim ated Cost NOx Em issions SO2 Em issions CO2 Em issions
(%) 1 Energy ($) Sim ple Estim ated Savings Savings Savings
Com bination of Measures 5
Savings Payback (yrs)
Site Source Marginal Cost 3 New System Cost 4 Annual (lbs/yr) Annual (lbs/yr) Annual (tons 6/yr)
($/year) 2
Com bination 1
16 100% Energy Star Permanent CFL or Fluorescent Indoor Lamps $50 - $215
7 Decreased Window SHGC & U Value (from .3 to .2 SHGC & from .5 to .3 U-Value) 15.8% 15.8% $403 $900 - $1,100 3.1 - 5.4 5.8 3.6 2.4
1 Radiant Barrier in Attics (w ith Ducts in Attics) $300 - $880
Com bination 2
15 75% Energy Star Permanent CFL or Fluorescent Indoor Lamps $25 - $110
7 Decreased Window SHGC & U Value (from .3 to .2 SHGC & from .5 to .3 U-Value) 15.4% 15.4% $393 $900 - $1,100 5.4 - 9.4 5.7 3.6 2.4
9 Improved Heat Pump Efficiency (from 13 to 15 SEER and from 7.7 to 8.5 HSPF) $1,200 - $2,500
Com bination 3
8 Relocate Mechanical Systems w ithin Conditioned Space $1,000 - $7,000
16.0% 16.0% $407 10.3 - 27.0 5.9 3.7 2.5
14 Solar Domestic Hot Water System (64 sq. ft. collector, 80 gal tank) $3,200 - $4,000
Note: [2009 IECC Code-Compliant House Description]
1. Total energy savings from heating, cooling, lighting, equipment and DHW for emissions reductions determination. * Building type: Residential
2. Energy Cost: Electricity = $0.11/kWh * Gross area: 2,325 sq-ft
3. Marginal cost = new system cost - original system cost * Building dimension: 48.2ft x 48.2ft x 8ft (WxLxH)
4. New system cost = new system cost only * Number of floors: 1
5. See individual measures above for specific savings * Floor-to-floor height: 8ft
6. Conversion factor: 1 ton = 2,000 lbs * Window -to-floor ratio: 15% (Window -to-w all ratio: 22.6%)
* Lighting: 50% Energy Star permanent CFL or fluorescent lamps
Energy * HVAC system: SEER 13 AC and 7.7 HSPF heat pump TO TEXAS JURISDICTIONS
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* DHW: 0.90 Building Officials Association of Texas - Mid Year Meeting
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* Duct Location: Unconditioned, vented attic
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* Duct Leakage to Outdoor: 8 cfm/100 sq-ft CFA

33. Energy
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Proposed Energy Efficiency Measures (EEMs)
Laboratory
2009 IECC Code-Compliant House with Heat Pump Heating
Description of Individual Measures
Annual Energy Savings
(%) 1
Individual Measures
Site Source
A Envelope and Fenestration Measures
1 Radiant Barrier in Attics (w ith Ducts in Attics) 1.8% 1.8%
2 Sealed (Unvented) Attic 4.0% 4.0%
3 Window Shading (None to 2 ft. Eaves on All Sides) 2.1% 2.1%
Window Shading and Redistribution (22.6% Equal Window s on All Sides w ith No
4 2.9% 2.9%
Shading to S=40.7%, N=22.6%, E/W = 13.6% w ith 2ft. Eaves on All Sides)
5 Decreased Window SHGC (from .3 to .2) 2.0% 2.0%
6 Decreased Window U Value (from .5 to .3) 3.8% 3.8%
7 Decreased Window SHGC & U Value (from .3 to .2 SHGC & from .5 to .3 U-Value) 5.6% 5.6%
B HVAC System Measures
8 Relocate Mechanical Systems w ithin Conditioned Space 6.3% 6.3%
9 Improved Heat Pump Efficiency (from 13 to 15 SEER and from 7.7 to 8.5 HSPF) 6.7% 6.7%
C Dom estic Hot Water Measures
13 Solar Domestic Hot Water System (32 sq. ft. collector, 65 gal tank) 7.6% 7.6%
14 Solar Domestic Hot Water System (64 sq. ft. collector, 80 gal tank) 9.7% 9.7%
D Lighting Measures
15 75% Energy Star Permanent CFL or Fluorescent Indoor Lamps 4.3% 4.3%
16 100% Energy Star Permanent CFL or Fluorescent Indoor Lamps 8.8% 8.8%
Energy
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17 4 kW Photovoltaic Array 27.1% 27.1%

34. D Lighting Measures
Proposed Energy Efficiency Measures (EEMs)
15 75% Energy Star Permanent CFL or Fluorescent Indoor Lamps
4.3% 4.3%
2009 IECC Code-Compliant House with Heat Pump Heating
16 100% Energy Star Permanent CFL or Fluorescent Indoor Lamps 8.8% 8.8%
E Renew able Pow er Measures
17 4 kW Photovoltaic Array 27.1% 27.1%
Description of Com bined Measures
Annual Energy Savings
(%) 1
Com bination of Measures 5
Site Source
Com bination 1
16 100% Energy Star Permanent CFL or Fluorescent Indoor Lamps
7 Decreased Window SHGC & U Value (from .3 to .2 SHGC & from .5 to .3 U-Value) 15.8% 15.8%
1 Radiant Barrier in Attics (w ith Ducts in Attics)
Com bination 2
15 75% Energy Star Permanent CFL or Fluorescent Indoor Lamps
7 Decreased Window SHGC & U Value (from .3 to .2 SHGC & from .5 to .3 U-Value) 15.4% 15.4%
9 Improved Heat Pump Efficiency (from 13 to 15 SEER and from 7.7 to 8.5 HSPF)
Com bination 3
8 Relocate Mechanical Systems w ithin Conditioned Space
16.0% 16.0%
14 Solar Domestic Hot Water System (64 sq. ft. collector, 80 gal tank)
Note:
1. Total energy savings from heating, cooling, lighting, equipment and DHW for emissions reductions determination.
2. Energy Cost: Electricity = $0.11/kWh
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3. Marginal cost = new system cost - original system cost
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4. New system cost = new system cost only

35. What about the new 2012 IECC?
In 2011 ICC published new editions, triggering the SECO
review and energy codes update process:
 May, 2011: IECC 2012 edition published
 July, 2011: IECC 2012 publication available
 Dec, 2011: ESL will provide written
recommendation to SECO
 SECO: Allow 30 day public comment period on new
code recommendation
 all comments are provided to ESL for a recommendation to
SECO.
 SECO: SECO will provide ruling in Texas Register
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36. Thank You!
Please visit our website at Esl.tamu.edu for reports and information!
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37. Contact Information: Cyndi Lewis
Texas Emission Reduction Plan Manager- ESL
Phone: 979-777-3165 Email: cyndim@tamu.edu
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