It’s easy to get greener
Display Energy Certificates for buildings are intended to stimulate reductions in their energy consumption. Lisa Wilkinson discusses the role of monitoring an targeting to improve the operational rating of buildings.Buildings are one of the UKs biggest carbon emitters and with increasing pressure from Government and impending legislation due out in 2008 for public buildings (Display Energy Certificates [DECs] in October and Energy Performance Certificates [EPCs] in April) businesses cannot afford to become complacent about their energy ratings. Identifying where, when and how much energy is consumed in a building is often seen as facilities and energy management best practice and a socially responsible initiative. However, with legislation coming into force businesses and local authorities in particular will no longer be able to hide behind the practice of ‘voluntary’ energy management. Facilities and energy managers must act now to proactively monitor, record and reduce the energy used by their buildings to get the best possible energy rating and reduce their carbon footprint. The legislation
The purpose of the EPC is to record how energy efficient a property is based on its asset rating and will score each building on an efficiency scale of A to G (A the most efficient and G the least). Similar to the current grading system for refrigerators based on energy consumed, the EPC details the building’s energy efficiency based on its ‘asset rating’ — how the building ‘should’ be performing based on property, equipment and usage specifics. The DEC, in contrast, is based on the ‘operational rating’, hence the need for metered data. Making the grade with aM&T*
To meet the requirements of this legislation, in particular for DECs, building managers must identify where most of the building’s energy is being consumed, when and how. One of the most important and often overlooked areas of energy management is analysis. The most cost effective, simple to install and user-friendly way of collating and analysing this information is via an automatic monitoring and targeting device (aM&T). However, for business to take the next step, energy management does not start and stop just at the conformance to legislation and hence should not stop at metering the building’s incoming energy supplies. Energy management is also about using the operational rating and the metered data to identify, control and reduce the rating and, ultimately, the energy consumption. Newer and more sophisticated versions of aM&T devices can do this easily. By offering an all-round energy-management package, these devices take traditional aM&T to the next level with the added element of control, which means users can actively control equipment such as heating or lighting according to changing conditions such as weather and coordinate suitable ‘on’ times in response to requirements. They can also remotely turn equipment off if required. These systems therefore not only provide information on operational ratings for buildings as part of the legislation but also provide additional information on equipment conditions and a site’s HVAC&R performance, enabling business to identify inefficiencies in equipment and activities instantly.
Two measures of building performance: on the left is the energy-efficiency rating, which is a measure of overall efficiency; on the right is the environmental-impact rating, which is a measure of carbon-dioxide emissions. Buildings with an environmental-impact rating near the top of these scales have less impact on the environment.
Meeting DEC legislation is the first step in effective energy management. However ,effective energy management is much more than conforming to legislation; it is also about analysing data to identify opportunities for improving energy consumption and producing information to compare before and after — showing a constant improvement in operational rating. That capability is provided, for example by t-mac’s energy analysis and energy showcasing ‘Dashboards’. Specifically designed to answer business-critical questions about energy-management activities for single or multiple sites throughout the world, these Dashboards provide live and online graphical data of a business’s energy performance and activities. The Dashboards display energy consumption and costs, allow for market simulation for billing reviews, showcase energy efficiency or inefficiency, calculate its benchmark and identify areas of waste and excessive use. Liverpool City Council uses the Dashboard to help showcase and identify areas to reduce energy wastage from its public buildings. The Dashboard now displays each building’s energy ratings live and online in the A to G format, providing a real-time energy performance rating based on current Carbon Trust guidelines and calculations. Going green
Accurate measurement is the key in meeting legislation. By monitoring and tracking energy use in real time, aM&T devices can minimise wastage and provide exact and instant reports and data updates easily. The Dashboard provides an ideal interface for public awareness and information, transferring live utility data into meaningful and useful information and, most importantly, enabling users to meet legislation. Monitoring energy consumption to ascertain a building’s operational rating should not be considered as a laborious task, expensive or difficult to implement as, through the application of technology like t-mac, meeting legislation and acquiring and showcasing up-to-date energy information can be carried out easily and efficiently. By employing this type of technology, businesses can comply to DEC now and will be prepared for the impending Carbon Reduction Commitment (CRC) legislation. This technology will enable businesses to accurately manage energy usage within th elimits of the carbon-credits they have purchased, identify areas for improvement to reduce costs, reduce the carbon-credit requirements for the following year and move up the CRC league-table. Lisa Wilkinson is a director with t-mac Technologies Ltd. * automatic monitoring and targeting.