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ESL HH 10 08 19 Energy Efficiency Renewable Energy EERE Projects in Texas Public Schools Hyojin Kim Graduate Research Assistant Zi Liu Asst Research Engineer Juan Carlos Baltazar Assc Research Engineer Jaya Mukhopadhyay Research Associate Jeff S Haberl Professor Assc Director Sunglok Do Graduate Research Assistant Bahman Yazdani Assc Director Charles Culp Assc Professor Assc Director Energy Systems Laboratory Texas A M University System College Station TX ABSTRACT This paper presents the preliminary results from an analysis of the energy saving potential in new and existing Texas Independent School Districts ISDs The analysis was performed using a K 12 simulation model based on the DOE 2 1e program that uses ASHRAE Standard 90 1 code compliant school buildings for three climate zones in Texas In this analysis government and private data sources from the U S EPA Energy Star the Texas Education Agency and the EnergyPlus Benchmark school models were reviewed to determine the base case K12 school characteristics in Texas Available guidelines and case studies were reviewed to develop energy efficient measures for high performance school buildings As a result four base case school models that are compliant with the ASHRAE Standard 90 1 1989 1999 2004 and 2007 were developed for each climate zone In addition a total of eighteen energy efficient measures were considered These include measures for the building envelope lighting HVAC system DHW system and renewable energy systems The proposed energy efficient measures were then applied to the base case school model to examine the energy saving potential for Texas ISDs INTRODUCTION Schools are one of the building types with a high energy saving potential from the application of high performance strategies The most efficient schools use one third the energy than the least efficient schools EPA 2010 Im and Haberl 2006 reviewed over fifty studies on existing high performance schools From this review the annual energy savings from the application of high performance strategies ranged from 20 to 40 However to maximize the savings from high performance applications it is obvious that different strategies are needed for schools built in different years as well as different climate zones According to the survey of Texas Comptroller of Public Accounts 2006 the average age of Texas elementary middle and high schools is 35 2 32 2 and 32 7 years old respectively In addition the average enrollment of Texas public schools continuously increased over the past 10 year period by 20 1 TEA 2009 This would indicate that there is a huge energy saving potential in both existing and new schools in Texas from the application of high performance retrofit strategies This paper presents the preliminary results from an analysis of the energy saving potential in new and existing Texas Independent School Districts ISDs The analysis was performed using a K 12 simulation model based on the DOE 2 1e program that uses ASHRAE Standard 90 1 code compliant school buildings for three climate zones in Texas according to ASHRAE 90 1 2004 and 2007 climate zone classifications METHODOLOGY Figure 1 shows the detailed procedure for calculating the potential energy savings for existing K 12 schools in Texas In this analysis the existing K 12 schools were classified as three school groups according to the year of construction as Group 1 schools built before 2000 Group 2 schools built between 2000 and 2007 and Group 3 schools built after 2007 To calculate potential energy savings for new high performance K 12 schools in Texas new schools that will be constructed in 2011 were classified as Group 4 and the total floor area sq ft of new schools will be estimated using the population growth rate For the baseline of new schools ASHRAE Standard 90 1 2007 requirements were referenced To estimate the savings of all the schools of Texas simulations for every school in each county should be carried out which would lead to an extraordinary number of simulations To simplify the calculation procedure different counties in Texas were grouped according to ASHRAE 90 1 2004 and ESL HH 10 08 19 Grouped Counties by ASHRAE 90 12004 2007 Climate Zones Texas Education Agency Elementary School No of This Type of School Middle School Avg No of Students This Type of School Energy Star School SECO K 12 Energy Audit Avg Sq ft This Type of School Avg Sq ft Student Population Growth Rate Estimated No of This Type of School Year This Type of School Built High School Group 1 Group 2 Group 3 Group 4 Built Before 2000 Built 2000 2007 Built 20072010 Built After 2010 School Model Assumptions School Model Assumptions School Model Assumptions School Model Assumptions ASHRAE 90 1 1989 Specifications ASHRAE 90 1 1999 Specifications ASHRAE 90 1 2004 Specifications ASHRAE 90 1 2007 Specifications Group 1 Base Case School Model Group 2 Base Case School Model Group 3 Base Case School Model Group 4 Base Case School Model Total sq ft for Each Base case School in Each Climate Zone Weather Zone Assigned Weather Station EPlus Benchmark School Model AEDG School Baseline Model Survey of College Station Bryan ISDs Simulation eGrid School Compliant with ASHRAE AEDG Savings sq ft Individual Energy Efficiency Measures Energy and Cost Savings of each EEM Total Statewide Energy and Emissions Savings Energy Savings in This County Group Calculation Energy Savings for Each Base case School Payback Calculation Cost Effective EEM Figure 1 Flow Chart for Calculating Potential Energy Savings for Existing K 12 Schools 2007 Climate Zones Then a representative county in each climate zone was selected such as Harris County for Climate Zone 2 Dallas County for climate zone 3 and Potter County for Climate Zone 4 Figure 2 For each representative county four base cases of each school group based on the year the school was built that complies with the corresponding requirements of ASHRAE 90 1 1989 1999 2004 and 2007 were simulated Finally the total energy consumption of the existing and new schools in Texas will be calculated using the simulated energy use intensity kBtu sq ft and the surveyed total floor area sq ft of each school group in each climate zone Development of Base Case Model To develop a base case school model the following sources were reviewed the ASHRAE Standard 90 1 1989 1999 2004 and 2007 the U S EPA Energy Star the Texas Education Agency TEA and the EnergyPlus Benchmark school Figure 2 Climate Zones in ASHRAE Standard 90 12004 2007 and


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