Best Practices and Benefits of Optimizing Lighting and HVAC Control
By Craig Hall, GE Lighting, and Neil Maldeis, Trane
School building energy and operating costs are taking an increasingly large bite out of the average district’s budget these days, which has caused energy efficiency to move up on most administrators’ to-do lists.
After all, K-12 school districts in the United States collectively spend more than $6 billion a year on energy, which is more than they spend on textbooks and computers combined, according to the U.S. government’s Energy Star program. And the U.S. Department of Energy (DOE) estimates that as much as 30 percent of a typical school’s energy buy is wasted because of inefficient and often aging structures, building systems and operating practices. The Energy Information Administration (EIA) notes that as much as 70 percent of the typical school’s energy use goes for lighting, cooling, space heating and ventilation.
Taking steps to improve energy efficiency can reduce school districts’ energy costs, shrink their environmental footprint, and create a better, more comfortable learning environment for students, teachers and administrative staff. Energy efficiency measures can often be implemented with little upfront capital cost and will provide an excellent return on investment, paying for themselves many times over the decades-long occupied life of a typical school building.
Energy audits uncover efficiency improvement opportunities
Administrators implementing an energy-efficiency strategy can start by conducting an energy audit, which provides vital information about school building performance, uncovers energy conservation opportunities and makes sure heating, ventilation and air conditioning (HVAC), lighting and other building systems are operating effectively and efficiently. Many organizations partner with an energy services company (ESCO) or other qualified third party to conduct building audits.
Well-conducted energy and lighting audits uncover opportunities to reduce energy consumption and improve the classroom environment by upgrading indoor and outdoor lighting technologies. According to Energy Star, a comprehensive lighting retrofit can reduce lighting costs by 30-50 percent in the school environment.
A lighting audit also may identify opportunities to increase daylight harvesting, which has been shown in multiple studies to both reduce energy costs and improve classroom performance. Integrated lighting control systems use sensors, actuators and building automation system (BAS) technologies to maximize the amount of daylight in a particular classroom, supplementing outdoor lighting with artificial lighting to maintain consistent and ideal lighting levels.
HVAC also plays a critical role in creating an ideal learning environment that is safer, healthier and more comfortable. A recent McGraw-Hill study found that 91 percent of K-12 school leaders believe that green schools have improved the health and well-being of their students and 70 percent see a direct correlation with higher test scores.
Heating and cooling also places big demands on a district’s energy budget, so naturally many of the energy efficiency measures identified in an energy audit relate to the HVAC system. HVAC energy efficiency improvement opportunities can range from simple adjustments to the building’s BAS, to installing variable air volume fans, to upgrading or replacing major system elements like the chilled water system, to implementing breakthrough technologies such as thermal storage systems.
Integration of lighting, HVAC raises the bar on energy savings
Today’s advanced BAS technology is taking energy management to the next level by integrating lighting and HVAC controls into a single automated platform. The result is greater comfort for building occupants and reduced energy consumption for the school district.
School buildings are particularly well-suited for implementation of this technology solution. Schools face a variety of unique lighting and operating challenges that are related to wide swings in scheduling and occupancy rates. Use of a single BAS-based platform to control lighting and HVAC can help schools make the most of their energy spend and avoid heating, cooling and lighting unoccupied spaces.
Developed by leading providers of lighting and comfort solutions, the most advanced platforms offer one-system simplicity, which means that facility teams can manage the system from a single user-friendly dashboard, accessible from any computer or mobile device via an Internet connection, rather than making manual adjustments on multiple platforms.
Integrated lighting and HVAC controls work together to create a comfortable learning and teaching environment indoors. For example, they can share the same sensors to determine whether a classroom is occupied and automatically adjust the lighting and temperature to ideal settings.
Settings can be easily customized to meet the specific needs of different types of classrooms or school common areas. The platform can even be programmed to provide teachers with the ability to control lighting and temperature in their classroom, within predetermined parameters.
The good news is that most schools already have the technology backbone in place to accommodate the integration of lighting and HVAC controls with their existing BAS or with an upgraded system. The ESCO can help the school district identify, prioritize and implement energy efficiency measures, many of which pay for themselves in five years or less.
Districts can choose to finance their energy-efficiency initiatives using an energy performance contract, which provides the opportunity to make improvements with little or no upfront cost and pay for them with future energy savings. Various federal, state, local and utility grants and financing programs may also be available for districts making energy efficiency improvements. ESCO representatives can help districts explore financing options.
School districts nationwide continue to look for ways to do more
with less without negatively impacting their primary mission of
creating a secure, comfortable and productive learning environment.
Saving energy by improving lighting and HVAC technologies and
integrating controls provides an excellent opportunity to reduce
costs, improve environmental performance and create a better place for
students to learn and faculty to teach.
Craig Hall is strategic account manager for GE Lighting, which develops energy-efficient solutions that change the way people light their world in commercial, industrial, municipal and residential settings. Hall is responsible for the GE-Trane relationship, which provides lighting and HVAC solutions based on the GE LightSweep™ control solution and the Trane Tracer™ building automation system. Hall has been with GE for 11 years and has nearly 30 years in the automation and control industry.
Neil Maldeis, Professional Engineer and Association of Energy Engineers Certified Energy Manager, is energy solutions engineering leader for Trane, a leading global provider of indoor comfort solutions and services and a brand of Ingersoll Rand. He is responsible for the technical development, support and review of performance-based contracting solutions and activities on a national basis. He has more than 30 years of experience as a mechanical/project engineer in the building construction and energy conservation fields. .