Browsing Technical Reports by Subject "2009 IECC"
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Estimates of Energy Cost Savings Achieved from 2009 IECC Code-Compliant, Single Family Residences in TexasKim, H.; Baltazar, J. C.; Haberl, J. (Energy Systems Laboratory (http://esl.tamu.edu), January 2011)[more][less]
Abstract: This report presents estimates of the energy cost savings to be achieved from 2009 International Energy Conservation Code (IECC) code-compliant, single-family residences in Texas compared to the pre-2009 IECC codes, including: the 2001 IECC, the 2006 IECC, and the 2006 IECC w/ Houston amendments (w/ HA). A series of simulations were performed using an ESL simulation model (BDL version 4.01.07 of IC3) based on the DOE-2.1e simulation and the appropriate TMY2 weather files for three counties representing three 2009 IECC Climate Zones across Texas: Harris County for Climate Zone 2, Tarrant County for Climate Zone 3, and Potter County for Climate Zone 4. Two options based on the choice of heating fuel type were considered: (a) an electric/gas house (gas-fired furnace for space heating, and gas water heater for domestic water heating), and (b) a heat pump house (heat pump for space heating, and electric water heater for domestic water heating). The base-case building was assumed to be a 2,325 sq. ft., square-shape, one story, single-family, detached house with a floor-to-ceiling height of 8 feet. The house has an attic with a roof pitched at 23 degrees. The base-case building envelope and system characteristics were determined from the general characteristics and the climate-specific characteristics as specified in the 2001 IECC, the 2006 IECC, the 2006 IECC w/HA, and the 2009 IECC. In addition, to facilitate a better comparison with the 2009 code, several modifications were applied to the pre-2009 IECC codes. As a result, the estimated annual energy cost savings per house associated with the 2009 IECC compared to the 2001 and 2006 IECC are: (a) an electric/gas house: $462/year and $206/year for Harris County, $432/year and $216/year for Tarrant County, and $576/year and $153/year for Potter County and (b) a heat pump house: $490/year and $203/year for Harris County, $487/year and $226/year for Tarrant County, and $680/year and $155/year for Potter County. The corresponding % savings of total energy cost of a 2009 IECC code-compliant house are: (a) an electric/gas house: 22.7% and 10.1% for Harris County, 21.8% and 10.9% for Tarrant County, and 28.9% and 7.7% for Potter County and (b) a heat pump house: 21.6% and 8.9% for Harris County, 20.9% and 9.7% for Tarrant County, and 25.7% and 5.8% for Potter County.
Files in this item: 1ESL-TR-11-01-01.pdf (272.1Kb)
Kim, H.; Liu, Z.; Baltazar, J. C.; Haberl, J.; Culp, C.; Yazdani, B.; Montgomery, C. (Energy Systems Laboratory (http://esl.tamu.edu), November 2010)[more][less]
Abstract: In the 79th Legislature (2005) the Energy Systems Laboratory was required to develop three alternative methods for achieving 15% above-code energy savings in new residential, commercial and industrial construction. The Laboratory continues to work closely with code officials, energy raters, manufacturers, state officials and other stakeholders to develop cost effective energy efficiency measures. This report presents detailed information about the recommendations for achieving 15% above-code energy performance, which are based on the 2009 International Energy Conservation Code (IECC), for single-family residences across the State of Texas. To estimate above-code savings (%) of energy efficiency measures, total source energy savings from heating, cooling, lighting, equipment, and DHW were considered for emissions reductions determination. The recommendations were developed for three 2009 IECC climate zones in Texas along with simple payback calculations. 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. The analysis was performed using an ESL simulation model based on the DOE-2.1e simulation of a 2009 IECC code-compliant, single family residence and the appropriate TMY2 weather files for seventeen counties in Texas for which TMY2 data is available. According to 2009 IECC Climate Zone, seventeen counties were categorized into three climate zones: Climate Zone 2, 3, and 4, and the 2009 IECC code-compliance base-case models were constructed for each climate zone. Two options based on the choice of heating fuel type were considered: (a) natural gas (gas-fired furnace for space heating, and gas water heater for domestic water heating), and (b) electricity (heat pump for space heating, and electric water heater for domestic water heating). A total of eighteen measures based on the energy savings above the base-case house were selected. These measures include building envelope and fenestration, HVAC system, domestic hot water (DHW) system, lighting and renewable options. The implementation costs of each individual measure were also calculated along with simple payback calculations. These measures were then combined to achieve the total source energy savings of the group is 15% above the base-case 2009 code-compliant house. As a result, three example combinations were proposed for each base case ((a) electric/gas house and (b) all-electric house) in each climate zone. Each combination was formed to have a different payback period. Finally, the corresponding emissions savings of each combination were calculated based on the eGrid for Texas.
Files in this item: 1ESL-TR-10-11-01.pdf (2.644Mb)