- HPAC Engineering
Walt Disney World Resort in Orlando, Fla., is among the most highly visited places on earth. Its “campus” consists of hundreds of buildings that include world-class hotel and conference centers, exotic ride environments, and precisely controlled spaces for horticulture and animal care.
In addition to a Wall-Street eye on the bottom line, Walt Disney himself encoded the company's DNA with an ethic toward conserving natural resources and the environment that remains to this day as a program called Environmentality. Environmentality is a way of thinking, acting, and doing business in an environmentally conscientious way — from saving energy and water to reducing waste and emissions.
At Disney, energy is paramount. Air-conditioning, refrigeration, compressed-air, and water-moving systems for buildings, rides, and transportation run primarily on electricity and natural gas. To maximize energy conservation and efficiency while minimizing costs and emissions, Walt Disney World has implemented a state-of-the-art energy-management program (EMP) that can serve as a role model to owners and administrators of public and private facilities.
This article will describe the EMP at Walt Disney World Resort in Orlando and discusses its results in terms of energy and cost savings. Perhaps in doing so, it will inspire other facility owners to develop their own EMPs and cultivate the economic, energy, and environmental benefits that Disney has.
THE ENERGY STAR FOUNDATION
The cornerstone of the Disney EMP is its strong partnership with the U.S. Environmental Protection Agency (EPA) through the EPA Energy Star Buildings program, which has five main components:
· Building tune-up (recommissioning).
· Energy-efficient lighting (Green Lights).
· Load reductions.
· Fan-system upgrades.
· Heating- and cooling-system upgrades.
The partnership between Walt Disney World and the Energy Star Buildings program was established in 1996, when Disney implemented the EPA Green Lights program across 17 million sq ft of facilities. This was completed in 1998 and resulted in annual electrical savings of 46 million kwh. Also in 1998, Walt Disney World Co. began the implementation of numerous cost-effective energy-saving projects.
Disney's projects included:
· Optimizing compressed-air-system controls.
· Upgrading hot-water-boiler controls.
· Retrofitting variable-speed drives into air, pumping, and chilled-water systems.
· Retrofitting demand-controlled ventilation into convention-center spaces.
· Upgrading and integrating energy-management systems (EMS), including one EMS vendor's stand-alone EMS to centralized network-based servers.
· Installing utility-submetering systems in the facilities of operating participants (non-Disney companies working on Disney property) for utility-cost recovery.
In aggregate, the efforts Disney has undertaken since 1996 have resulted in a 53-percent internal rate of return (IRR) and metered annual reductions of approximately 100 million kwh of electricity and 1 million therms of natural gas.
THE DISNEY EMP FRAMEWORK
Disney's EMP has three main components: the EMSs that are installed in each building or facility; the energy-information system (EIS), which is a suite of information technologies that works with the EMS to provide data and information to energy managers and other stakeholders; and Disney staff (called “cast members”), who collectively participate in the EMP. It's the combination of technology and people that makes the EMP successful and sustainable.
Each of these main components will be described, followed by an example of how they work together in the building-tune-up (BTU) process.
THE ENERGY-MANAGEMENT SYSTEM
An EMS performs real-time monitoring and control of the HVAC and lighting systems in a building. The parameters of greatest interest are temperature and humidity setpoints and equipment-operating-time schedules, including those for lighting.
Over the years, Disney has installed a variety of EMSs from different vendors, which it continues to operate. One vendor's system controlled more than 80 percent of the installed EMS base. This system recently was upgraded to a centralized server-based system connected to the corporate Ethernet-based intranet. This upgrade was very cost-effective and accomplished entirely with in-house staff.
The EMS upgrade enables operators and managers to have access to equipment, schedulers, data, and information through the corporate intranet (Figure 1), which has the following benefits:
· Reviews of EMS field-panel programming and real-time operation can be made globally through any desktop computer on the corporate network.
· EMS programs and data are stored on network servers that are maintained by the Walt Disney World Information Services group. Backups are made daily.
· A program residing on the network servers automatically resets equipment time clocks and setpoint schedules on a daily basis.
· Data from EMS points and utility meters can be collected and used by the EIS for quick and easy display.
This upgrade also provided a standard and stable hardware and software platform for Disney's EMS. The procurement methodology is described in the sidebar, “Disney's EMS Strategy.”
THE ENERGY-INFORMATION SYSTEM
The philosophy, “If you can measure it, you can manage it,” is critical to a sustainable EMP. Measurement for management is the job of the EIS.
The EIS is a suite of programs and computers that collect data from the EMS and other sources and churn them into actionable information for use by operators and managers. Essentially, the EIS measures energy at the facility level and tracks the results of BTU efforts over time.
Continuous feedback on utility performance pinpoints problems in the EMS that need attention. Such feedback also drives Disney's incentive program, which keeps people actively seeking to reduce consumption and expenses without creating new problems, such as degrading indoor-air quality or comfort.
Disney created their own Web-based EIS that uses an off-the-shelf database-management system to store the vast amount of collected energy data. Custom software, called the Utility Reporting System (URS), resides on a network server. The URS gathers, stores, and processes monthly-utility-bill data and hourly meter data from a variety of data-collection sources. URS reports are created in Web-accessible (HTML) formats and can be reached via the Disney intranet.
One popular feature of the URS is a “report-card” format for publishing utility data and historical information. The report card is distributed via e-mail on a monthly basis, with each message containing high-level (summary) information and hyperlinks allowing “point-and-click” access to greater detail. Some links are to graphs that compare current data to data from up to 12 previous months. Also, data can be filtered to compare one Disney area against others. For example, how is Epcot performing relative to Disney's Animal Kingdom? Such comparisons stoke a healthy spirit of competition among area managers.
The report-card format is intuitive and the drill-down and sorting capabilities are easy to use by everyone — so much so, that a URC program was created for the Orange County School District by the Florida Solar Energy Center, which is highlighted in the accompanying sidebar.
Specialized reports are used to monitor and report utility usage by operating participants in Disney facilities, which helps to keep them aware of their usage rates. By measuring actual energy consumption instead of a square foot allocation, operating participants are motivated to manage their energy usage to keep their utility expenses low. At the same time, Walt Disney World is able to recover utility expenses used by the operating participants in a fair and accurate way.
PEOPLE ARE THE REAL ENERGY STARS
Everyone has a role to play in the Disney EMP. There is a dedicated staff of energy-conservation engineers and technicians who orchestrate the EMP, champion energy-conservation efforts, and keep the program moving forward by refining the EIS, EMS, and other program components.
Executive management supports the EMP by authorizing programs that affect staff and providing a budget sufficient to getting meaningful work done. New projects are considered based on their expected IRR. The higher the IRR, the better the chance of securing funds for implementation.
Disney also recognizes that cast members need to be involved in the EMP to establish a facilitywide sense of ownership and accountability for energy usage. Through employee-awareness programs, Disney cultivates Environmentality instead of dictating it.
Two employee programs work together to make the EMP a success. The first is the Energy Star Team meeting, which provides an avenue for continuous training and involvement. The second is the Energy Star Awards, which provides incentives. The two programs create a positive and productive culture for managing energy.
Energy Star Team meetings
Cast members who participate in the Walt Disney World EMP are part of the Energy Star Team. The Energy Star Team meets on a monthly basis and includes staff from the parks, resorts, and support areas.
The meetings provide a great opportunity to share and discuss best practices and learn of vendors' energy-saving products. If someone wants to try a technology in his or her area, the product will be installed and metered in one of his or herbuildings (some areas have more than one building). If it works, it can be rolled out to the entire property.
The Energy Star Team meetings also provide a good venue for providing on-going training to operators of the EMS and EIS.
Energy Star Awards
The Energy Star Awards program was developed to increase the awareness of energy usage among Disney management and cast members. It works by recognizing and rewarding successful energy-conservation efforts and demonstrates that energy conservation can be simple and fun.
Because utility-meter information is readily available in URS, a report was developed to provide feedback on how well each area is doing relative to prior-year usage. For example, Magic Kingdom, Epcot, and Contemporary Resort are all separately tracked and reported.
A spirit of competition is created by ranking each area based on percent change from the prior year. The areas with the greatest reductions rise to the top of the list. The awards recognize those areas that are at the top and identifies those areas on the bottom as being in need of improvement.
Each year, a report is generated to show the award winners. Details on the award winners' accomplishments are highlighted in Disney's corporate Environmentality report, Enviroport. No one stands to benefit financially from the EMP. Recognition for doing a good job has been the only incentive needed.
PUTTING IT ALL TOGETHER
The BTU or recommissioning step in the Energy Star Buildings program has been very cost-effective for Disney. The BTU process concentrates on optimizing the operation of EMS and generally results in a 5-to 20-percent reduction in utility usage in a very cost-effective manner. Disney's savings attributed to the BTU process have been approximately equal to the savings resulting from its Green Lights program, but at a fraction of the cost (Figure 2).
At the start of a BTU effort, teams are formed from the engineering and operations departments to review the building and EMS control devices, programming, and settings. The BTU process typically results in the following:
· Optimized time schedules and setpoints.
· Improved EMS performance through refinements of programming and documentation.
· A list of corrective actions identified by monitoring HVAC operations.
· Measured utility savings using URS.
The BTU process is simple and can be started at anytime with the organization of a BTU team. BTU teams are facilitated by an energy-management engineer with support from facility-engineering and building operations-and-maintenance departments.
Initially, 1-hr meetings are held once a week. This may not seem like much time, but a slow and steady pace is best for this type of work. Most of the detailed work is spent between the weekly meetings in the review and documention of the EMS control sequences, setoints, and time schedules. Each building and each HVAC system is evaluated one system at a time until all of the systems have been reviewed and everything is working properly.
The key to a successful BTU program is to manage the details. To help with that effort, Disney uses two custom software tools that work together to keep EMS settings intact: Facility Time Schedule (FTS) and Building Tune Up System (BTUS).
The FTS program manages equipment time schedules and temperature setpoints in a central database. Because time schedules and setpoints can be changed from their optimal settings and not set back, the FTS was created to reset them on a daily basis automatically.
BTUS is a Web-based program that allows users to view EMS control settings without accessing the EMS. Critical parameters of EMS operation are stored in a relational database. A Web-accessible program displays the information via a Web browser. The BTUS shows:
· HVAC equipment and the area serviced, providing color-coded floor plans.
· Equipment time schedules and setpoints.
· Action items for each HVAC system.
· Links to EMS trend graphs and historical data.
Disney Saves Water, Too
An audit of water usage throughout Disney's Animal Kingdom revealed new strategies for saving money and enhancing best practices. A temporary metering system installed for restaurants, restrooms, and aquatic environments for animals allowed cast members to monitor water flow in multiple sites without incurring traditional costs associated with permanent devices. Results indicated that in some areas, less water would produce the same effect. Combined efforts to reduce water consumption throughout the park have resulted in savings of 145 million gal of water per year, a reduction of 22 percent.