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- 1. © Optimal Green Operations OgreenO Benchmarking Energy Efficiency Engagements in K-12 schools May 26, 2010 Working Document
- 2. © Optimal Green Operations OgreenO Why is Benchmarking Existing Energy Efficiency K-12 Projects Important To Tracking Performance for NYC Schools? •Understand metrics that best-in-class school districts use to report performance to their stakeholders. •Initiate identification of variables to be tracked for appropriate energy conservation improvement decisions to be made. Energy usage System variables Operating schedules Others Effective Managing Requires Measuring; Need To Identify Best Practices in Performance and Systems-Level Metrics Tracking
- 3. © Optimal Green Operations OgreenO Energy Efficiency for K-12 Schools: An Overview Process: •20 + Case Studies researched for K-12 Schools •Excluded those cases that were primarily new school/design focused, and those with incomplete implementation information •Focused on School Challenges, Energy Conservation Measures, and Impact •Also looked at best practices on how schools are tracking and reporting on performance Initial Findings: Energy Management Systems implementations, HVAC Performance Dashboards from high performing schools upgrades and high efficiency lighting were the most common are often publicly available (online) and typically include: types of Energy Conservation Measures, reflecting the •Financial Savings (monthly, annual, cumulative) breakdown of energy use in schools: •Environmental Impact (CO2 emissions, equivalent acres of trees saved/barrels of oil) •Energy Consumption Reduction •Energy Star Rating Online Performance Dashboard for School in Council Rock School District, PA (source: Clean Energy Strategies for Local Governments, DOE 2006)
- 4. © Optimal Green Operations Foster-Glocester Regional School, RI OgreenO The Challenge The new high school and middle school consist of north and south buildings totaling 371,000 square feet. The district challenge was to reduce its energy usage, save money, and institute a reliable renewable energy initiative. Implementation Summary Impact Energy Conservation Measures Energy Conservation Measures Renewable Installed two biomass-fueled boilers Energy totaling over 10 million Btus/hour. An automatic auger woodchip delivery and Environmental Benefits storage system was also constructed. 3,621.59 tons of harmful greenhouse gas emissions reduced annually, equivalent to: Lighting Control Installed high efficiency lamps and • Preserving 24.3 acres of forest from deforestation or Enhancements ballasts, luminaires, lighting control • Conserving 6,932 barrels of oil system network and stand-alone lighting controls. Financial Benefits Capital Costs $12,200,000 HVAC Energy recovery ventilation (ERV) system Annual Energy Savings $760,857 Equipment and proposed in all classrooms for optimal Payback ventilation. Controls Electrical All electrical power distribution Enhancements components were evaluated and installed with equipment of the highest level of efficiency. Water Efficiency Installation of low-flow toilets, sinks, showers and urinals. •Installation of automatic shutoff valves Case Study Sources: for most fixtures. EnergyStar California Energy Commission Con Edison Solutions Other Participation in, and support of, district- US Department of Energy wide energy education programs.
- 5. © Optimal Green Operations Columbia Public Schools OgreenO Columbia, MO The Challenge The Columbia Public School District is comprised of 30 school buildings. Many of these schools are older facilities that were constructed without central air conditioning. The district wanted to hold summer school for elementary school students and needed a way to keep the students cool during the hottest days of the year. Implementation Summary Impact Energy Conservation Measures Environmental Benefits Building Controls Energy management system 612 tons of harmful greenhouse gas emissions reduced annually, equivalent to: •Preserving 3.9 acres of forest from deforestation or Building •Roof replacement •Conserving 1,291 barrels of oil Envelope •Window replacement Financial Benefits Renewable Ground-source heat pump Capital Costs $14,109,853 Energy Annual Savings: Electrical Electrical power distribution Energy: $139,709 Enhancements Non-Energy: $10,700 Utility Cost Reduction: 26% Case Study Sources: EnergyStar California Energy Commission Con Edison Solutions US Department of Energy
- 6. © Optimal Green Operations Bluestem Unified School District 205 Leon, KS OgreenO The Challenge Several unique obstacles arose during the course of the project with Bluestem Unified School District 205. One of the elementary schools evaluated, though only eight years old, had never had a properly functioning mechanical and controls system. This particular school was costing the district nearly 30% more annually than the other schools. Another issue at Bluestem was the difficulty operating a new control system. Finally, the high school had a failing roof and old inefficient heating and cooling systems that needed to be replaced in the near future. Implementation Summary Impact Energy Conservation Measures Environmental Benefits High efficiency lighting 979 tons of harmful greenhouse gas emissions reduced annually Lighting Equivalent to: •Preserving 6.2 acres of forest from deforestation or •Conserving 2,065 barrels of oil Controls •New energy management system •Kitchen exhaust hood •Domestic hot water feed pump Financial Benefits •Chilled water pump Capital Costs $2,461,563 HVAC system upgrade Annual Savings Energy: $65,801 Heating and Non-Energy: $14,914 Cooling Utility Cost Reduction: 21% Water Low-flow water fixtures Building Roof replacement Envelope Case Study Sources: EnergyStar California Energy Commission Con Edison Solutions US Department of Energy Other Building retrocommissioning Replace power transformer
- 7. © Optimal Green Operations Harrisonville Cass R-IX School District OgreenO Harrisonville, MO The Challenge The district needed more facility space because of a projected increase in enrollment. The district also had maintenance problems as a result of failing equipment and aging facilities. Unfortunately, with these needs, the district had limitations to funding options. They needed to save on outside contractor fees, reduce work orders, and decrease staff time dedicated to preventative maintenance. Implementation Summary Impact Energy Conservation Measures Lighting High efficiency lighting Environmental Benefits 2,578 tons of harmful greenhouse gas emissions reduced annually Equivalent to: Controls Energy management system Preserving 16.3 acres of forest from deforestation or Conserving 5,438 barrels of oil Financial Benefits Heating and Cooling Variable frequency drives Capital Costs $3,953,985 Chiller Annual Savings: Energy: $240,744 Water Low-flow water fixtures Non-Energy: $16,557 Utility Cost Reduction: 32% Building Envelope Roof repair Windows Case Study Sources: Doors EnergyStar California Energy Commission Con Edison Solutions US Department of Energy Other Upgrades Pipe Insulation
- 8. © Optimal Green Operations Murrieta Valley Unified OgreenO School District, CA The Challenge After the 2001 electricity shortage, Murrieta Valley Unified School District needed to improve the energy efficiency of its school facilities and sought technical assistance from the Energy Commission’s Bright Schools Program. Implementation Summary Impact Energy Conservation Measures Environmental Benefits – Not available Lighting lighting retrofits Financial Benefits Peak Demand Savings: 522 kW Controls Energy management system Energy Savings: 3,145,280 kWh Annual Cost Savings: $420,000 Simple Payback: 4.6 years Heating and Cooling HVAC upgrades Other Motor replacement Cogeneration for swimming pools Case Study Sources: EnergyStar California Energy Commission Con Edison Solutions US Department of Energy
- 9. © Optimal Green Operations Rio Linda Union School District, CA OgreenO The Challenge In 2002, Rio Linda Union School District received a California Energy Commission low interest loan for $684,130 to install energy efficient lighting at 21 elementary schools. Rio Linda Union School District is located in Sacramento County and serves approximately 10,000 students. This district-wide project focused on interior and exterior lights in 238 buildings, totaling nearly 740,000 square feet. Implementation Summary Impact Energy Conservation Measures Lighting Replace T-23 fluorescent lamps with T-8 Environmental Benefits – Not available fluorescent lamps and electronic ballasts Replace inefficient mercury vapor lighting Financial Benefits in cafeterias with T-5 high output fluorescent lamps and electronic ballasts. Total Project Cost: $1,511,130 Estimated Annual Cost Savings: $155,700 Many interior and exterior incandescent Estimated Annual Energy Savings: 1,869,441 kWh bulbs were replaced with compact fluorescent lamps. 11,831 therms Simple Payback: 9.7 years (based on total project cost) Over 7,800 fixtures retrofitted or replaced Case Study Sources: EnergyStar California Energy Commission Con Edison Solutions US Department of Energy
- 10. © Optimal Green Operations Willits Unified School District, CA OgreenO The Challenge Financed by a low interest loan from the Energy Commission, the district installed energy efficient lighting in all district schools. This project will reduce the district’s annual energy bill by about 11 percent. Implementation Summary Impact Energy Conservation Measures Lighting Energy efficient lighting in all schools Environmental Benefits – Not Available Financial Benefits: Controls New Energy Management System Annual Energy Savings 98,700 Improve HVAC controls Annual Cost Savings $14,600 Estimated Simple Payback: 7 years Renewable Installation of 29.5 kW photovoltaic system at Willits High School Case Study Sources: EnergyStar California Energy Commission Con Edison Solutions US Department of Energy