Rating systems for counting buildings environmental performance
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1 754 2nd PALENC Conference and 28th AIVC Conference on Building Low Energy Cooling and Rating systems for counting buildings environmental performance A.M. Papadopoulos, E. Giama Aristotle University Thessaloniki, Greece ABSTRACT The building and construction sector is a key sector for sustainable development. In response to the demand for evaluation and management of buildings environmental performance several tools and methodologies have been developed and implemented to building construction aiming sustainable performance. The paper is focusing on rating systems analysis, comparison and implementation for buildings environmental performance. Criteria for rating systems evaluation are set, while the most representative rating systems such as BREEAM and LEED were implemented to office building in Greece. The building is located in the centre of the city of Thessaloniki. It is a new multiuse construction, in which the ground floor will accommodate a sales shop, the two first floors offices, and the later five residences. Our main goal was to quantify building s performance by implementing simple, low budget measures of sustainability according to LEED and BREEAM rating systems guidelines. 1. INTRODUCTION RATING SYSTEMS FOR SUSTAINABLE CONSTRUCTION Rating systems are environmental and management tools focusing on construction sector and targeting to sustainability as well as to economic and social benefits. Rating systems include influence and knowledge from other environmental methodologies, decision making and management tools. For instance, most of the rating systems have as a base concept Life Cycle Analysis methodology and similarities with Environmental Management Systems (EMS). They also include the energy audit part and extend this philosophy to other environmental issues such as water conservation, indoor air quality, materials selection, waste management, etc. Rating systems are actually scoring systems designed to evaluate new and older buildings based on a selected standard for environmental performance. Sustainable design guidelines are a way to include environmental issues on the design, construction and operation of buildings. 2. COMPARISON OF THE MOST POPULAR RAT- ING SYSTEMS There are several criteria for evaluating and selecting rating systems, some of them based on K.M. Fowler K.M and Rauch E.M. survey (2006), are the following: Measurable: Does the rating system use measurable characteristics to demonstrate the extent of sustainable design incorporated into the building? Applicability: Can the rating system be used on all of the types of buildings? Availability: Is the rating system easily adaptable to other markets? For instance can a European residential house be certified by an American rating system or the opposite? Development: Based on which methodology is the rating system formed? Is it based on standards and legislation demands, on life cycle concept, on ems philosophy, etc.? Usability: Is it practical and easy to be implemented from the user? Has it practical guides with separated implementation information depending on building type? System Maturity: This criteria is relevant to the year of the system s development, final revision, the number of buildings registered and certified. Technical Content: This is also an important parameter for rating systems and deals with the environmental aspects examined during the certification process. Communicability: Which is the reporting style of the certification at the end of the evaluation process? How the certified building will be well-known to outside organisations? Cost: This criterion is very important for the user and concludes data for the buildings cost certification process. Taking into account all these parameters, five (5) most representative rating systems have been chosen and compared. They were selected for being the most mature and well developed, as proven by the fact that other newer systems are based on their structure. Moreover, we tried to evaluate not only European rating systems but also American, Canadian, Korean and Japanese in order to identify differences and similarities between them. The rating systems examined are: GB TOOL: the system s origin is Korea; it is a rating system which uses for the building s performance evaluation measurable characteristics. The system was created on 1996 and was recently revised (2005). Data for registered or certified buildings are not available. Range of detailed and broad histograms are used at GB TOOL for certification s presentation. BREEAM: it is the most popular European rating sys- PALENC Vol 2.indd 754 7/9/2007 1:24:33 µµ
2 2nd PALENC Conference and 28th AIVC Conference on Building Low Energy Cooling and 755 tem, available to any country in and out Europe with measurable evaluation characteristics and practical to be implemented from the user. The system was created on 1990 is the older one and recently revised (2005). The certified buildings are more than 600 while there are not sufficient data for the registered ones. Pass, good, very good and excellent are the evaluation s results. LEED: it was developed in America with measurable evaluation characteristics. It is available to other countries too, and is very practical and user friendly as it is available online,. It is an also mature rating system created on 1998 and revised on The registered buildings are exceeding while the certified ones are more than 400. Certified (40%), silver (50%), gold (60%), platinum (80%) are used at LEED point system. The certified building gains award letter, plaque and certificate. CASBEE: this rating system s origin is from Japan available abroad with measurable evaluation characteristics during the certification process. It was created in 2001 and revised on Data for registered or certified buildings are not available. Spider web diagram, histograms and BEE graph are used for GASBEE certification s presentation to public and website published results for buildings certification. Green Globes US: a Canadian rating system available abroad with measurable evaluation characteristics during the certification process. The system was created on 2004 and revised on 2006 in the meanwhile 63 buildings were registered and 4 were certified. One to four globes (1=35-54%, 2=55-69%, 3=70-84%, 4=85%+) for Green Globes US, Canada and Plaque, Certification report and case study for the buildings certification. Although the systems have structural differences their goal is the same and focusing on environmental evaluation of buildings therefore the environmental issues examined in all systems are the: site potential, energy use, water conservation, materials use, indoor air quality, operational and maintenance and other such as renovation. 2.1 LEED rating system American environmental performance scheme for buildings The Leadership in Energy and Environmental Design (LEED) Green Building Rating System is an environmental performance scheme targeting to provide the building industry with consistent, credible standards for what constitutes a green building. LEED is the nationally accepted benchmark for the design, construction, and operation of high performance green buildings. It gives building owners and operators the tools they need to have an immediate and measurable impact on their buildings performance. LEED promotes a wholebuilding approach to sustainability by recognizing performance in five key areas of human and environmental health: sustainable site development, water savings, energy efficiency, materials selection, and indoor environmental quality. LEED can be implemented to several types of buildings such as: New Commercial Construction and Major Renovation projects, Existing Building Operations and Maintenance, Commercial Interiors projects, Core and Shell Development projects, Homes, Neighborhood Development, Guidelines for Multiple Buildings and On- Campus Building Projects, Schools and Healthcare. The multiuse and commercial buildings constitute the typical type of buildings registering for certification according to LEED evaluation process. Moreover, the interest for certification is more often appeared to nonprofit corporation and local government. The basic environmental aspects included in LEED evaluation process are presented at the figure following. LEED rating system examines the following environmental aspects during the evaluation process: Sustainable sites, the intent is to reduce pollution from construction activities by controlling soil erosion, waterway sedimentation and airborne dust generation (Max 14 credits earned). Water efficiency, the intent is to limit or eliminate the use of potable water, or other natural surface or subsurface water resources available on or near the project site, for landscape irrigation (Max 5 credits earned). Energy and atmosphere, the intent is to verify that the building s energy related systems are installed, calibrated and perform according to the owner s project requirements, basis of design, and construction documents (Max 17 credits earned). Materials and resources, the intent is to facilitate the reduction of waste generated by building occupants that is hauled to and disposed of in landfills (Max 13 credits earned). Indoor air quality, the intent is to establish minimum indoor air quality (IAQ) performance to enhance indoor air quality in buildings, thus contributing to the comfort and well-being of the occupants (Max 15 credits earned). Innovation and design process, the intent is to provide design teams and projects the opportunity to be awarded points for exceptional performance above the requirements set by the LEED (Max 5 credits earned). 2.2 BREEAM rating system UK environmental performance scheme for buildings BREEAM (Building Research Establishment s Environmental Assessment Method, source data: co.uk/envest) was developed in the United Kingdom in 1990 and is one of most popular building environmental assessment method with long track record. BREEAM covers a range of building types including: offices, homes, industrial units, retail units, and schools. When PALENC Vol 2.indd 755 7/9/2007 1:24:33 µµ
3 756 2nd PALENC Conference and 28th AIVC Conference on Building Low Energy Cooling and a building is assessed, points are awarded for each criterion and the points are added for a total score. The overall building performance is awarded a Pass (36 points), Good (48 points), Very Good (60 points) or Excellent (70 points) rating based on the score. BREEAM major categories of criteria for Design and Procurement include the: Management (commissioning, monitoring, waste recycling, pollution, minimization, materials minimization) Health & Wellbeing (adequate ventilation, humidification, lighting, thermal comfort) Energy (sub-metering, efficiency and CO 2 impact of systems) Transport (emissions, alternate transport facilities) Water (consumption reduction, metering, leak detection) Materials (asbestos mitigation, recycling facilities, reuse of structures, facade or materials, use of crushed aggregate and sustainable timber) Land Use (previously used land, use of remediated contaminated land) Ecology (land with low ecological value or minimal change in value, maintaining major ecological systems on the land, minimization of biodiversity). Pollution (leak detection systems, on-site treatment, local or renewable energy sources, light pollution design, avoid use of ozone depleting). The tables 1 and 2 present the checklists of environmental impacts examined when carrying out approximate assessments on new built or refurbishment schemes at the design stage. An important note is that is not possible to carry out a Management and Operation Assessment if the building has not been occupied for a minimum of 12 months. Table 1. BREEAM office buildings evaluation criteria (BREEAM Offices-Pre-Assessment Estimator and BREEAM Offices, 2006) Environmental issue examined Credits before operation Credits after a year of operation M Management Max 15,01 credits Max 15 credits HW Health and Max 15,002 credits Max 15 credits Wellbeing LE Land use Max 15 credits P Pollution Max 15 credits Max 18,21 credits E Energy Max 13,63 credits Max 14,74 credits T Transport Max 11,37 credits Max 10,9 credits M Materials Max 9,97 credits Max 9,99 credits W Water Max 4,99 credits Max 4,29 credits Table 2. BREEAM ecohomes criteria (BREEAM Ecohomes, report April 2006) Environmental issue examined Credits Ene Energy Max 24 credits Tra Public Transportation Max 6 credits Pol Mat Pollution Materials Max 11 credits Max 31 credits Wat Water Max 6 credits Eco Land use and ecology Max 9 credits Hea Health and wellbeing Max 8 credits Man Management Max 10 credits 3. CASE STUDY RATING SYSTEMS IMPLE- MENTATION TO GREEK OFFICE BUILDING For implementing rating systems a significant number of primary data is necessary in order to evaluate comprehensively the studied building. These data will be obtained through visits, interviews with project staff, users in case we evaluate an existing building and documents relevant to building s construction and use. Some important data required are for instance the building drawings, construction documents (e.g. ceiling plan, architectural shell drawings, details relevant to windows, walls, floors and ceilings construction), project manuals such as HVAC systems characteristics and materials lists used for the building s construction, building s operating schedule, water and energy consumption reports, waste management plan, e.t.c. Offices environmental performance were examined not only with rating systems evaluation process but also with LCA methodology. Both analysis defined that use phase of a building involves very high levels of energy consumption due to the office equipment, lighting and air conditioning. Moreover, significant consumption of water and cleaning products due to office cleaning and toilet use is remarked. The list following consists of significant environmental issues resulted from different evaluation processes: Office equipment energy consumption. In an office building the electricity consumed by office equipment can exceed 20% of total energy consumption. Personal computers are the major power user, being responsible for up to 60% of energy consumption Office lighting also consumes a significant amount of energy. Adjusting the intensity and quality of illumination to the needs of building users can save energy and money. Air conditioning is one of the main causes of energy consumption in many offices. Several options exist in order to reduce this energy consumption through adequate maintenance of the heating and air conditioning systems and sustainable office design. Transportation of materials and employees should not be forgotten. Waste management should also be considered and issues such as recycling and reuse for energy and materials conservation. Thermal insulation: Considerable benefits may arise from improved thermal insulation. Depending on local conditions, buildings in which, for instance, the percentage of external wall s insulation comes up to 57% of their total exposed surface, come up with a decrease of nergy consumption at about 10 20%. The tables following present the results from the LEED and BREEAM implementation at the design and construction phase of the offices in a mixed use building in PALENC Vol 2.indd 756 7/9/2007 1:24:33 µµ
4 2nd PALENC Conference and 28th AIVC Conference on Building Low Energy Cooling and 757 the centre of Thessaloniki, Greece. The evaluation process concerns the present situation without any significant changes to the construction. The BREEAM evaluation process evaluated the construction phase with almost 32 credits which means that extra work should be done for offices to be certified (certified credit is 36), so the present situation without any changes is not adequate enough for BREEAM certification. Table 3. BREEAM evaluation results at the design phase for office building in Greece Environmental Aspects Credits 1 Building Management 5,1 credits 2 Health and Wellbeing 6,924 credits 3 Energy 0,76 credits 4 Transport 1,52 credits 5 6 Water Materials 3,32 credits 4,16 credits 7 Land use 9 credits 8 Pollution 2 credits More detailed, the measures implemented for building management based on BREEAM rating system s guidelines are: an appropriate project team member to monitor building management commissioning in line with current Building Regulations and guidelines (1,67 credits), keeping evidence and reports relevant to building management issues (1,76 credits), monitoring and report on water consumption and construction waste management (1,67 credits). Moreover, for health and wellbeing environmental aspect at least 80% of net lettable office floor area is necessary to be adequately daylighted (1,154 credits), evidence should be provided to demonstrate that all desks are within a 7m radius of windows (1,154 credits) and that an occupant controlled glare control system (e.g. internal or external blinds) is fitted (1,154 credits), high frequency ballasts can be installed on all fluorescent and compact fluorescent lamps) (1,154 credits) and evidence provided to demonstrate that the risk of waterborne and airborne contamination has been minimized (1,154 credits). Finally, control of internal noise specified levels should be taken place (1,154 credits). For energy efficiency external luminaries and all light fittings should be controlled by systems which operate by daylight presence (0,76 credits). Good access available to and from public transport networks for commuting and business travel gives to building 1,52 credits while evidence provided to demonstrate that the assessed development is located in a zone with low annual probability of flooding adds 2 extra points. Furthermore, for water consumption: improvement of water fittings based on standards and legislation specifications give points to building, more credits are earned when some of the fittings use less water than the standard fitting (0,83 credits), water meters with a pulsed output could be installed on the main water supplies (0,83 credits), leak detection system installation (0,83 credits) and control to water supply for all unirals and WCs (0,83 credits) are easily implemented measures which give extra points to building evaluation. Rating systems structure, on materials use field, also give the opportunity to constructors and users to implement measures for sustainability such as: carpets and floor finishes selection (0,83 credits), materials selection by taking into consideration the source origin. Especially for timber products third party certification is required (2,5 credits). Moreover, the presence of a central dedicated storage space for recyclable materials either within the building or on site skips with good access for collections is evaluated with 0,83 credits. Finally and for land use impact category, some non cost, sustainable measures, easily implemented are the following: the site has been previously built upon or used for industrial purposes within the last 50 years (1,5 credits), the land used for new development has been defined as contaminated and adequate remedial steps have been taken to decontaminate the site prior to construction (1,5 credits), evidence is provided to demonstrate that the construction zone is defined as land of low ecological value and all existing features of ecological value will be fully protected from damage during site preparation and construction works (1,5 credits), the ecological value of the land used will be improved based on specified requirements (at least four of the requirements suggested from BREEAM checklist should be implemented) (3 credits). Table 3. LEED evaluation results at the design phase for office building in Greece Environmental Aspect Credits 1 Sustainable Sites Max credits 8 2 Water efficiency Max credits 4 3 Energy and atmosphere Max credits 4 4 Material and resources Max credits 4 5 Indoor Environmental Quality Max credits 8 6 Innovation in design Max credits 2 In correspondence to BREEAM, LEED rating system s guidelines for the environmental aspect of sustainable sites suggests: pollution prevention from construction activity, sustainable site selection, community connectivity, public transportation access and use, parking capacity, protection of the ecologic environment, stormwater design system protection and fluid control- and light pollution reduction. Each of the measures implemented give 1 credit. For water efficiency some easy implemented measures are: water efficient landscaping (2 credits), innovative wastewater technologies implementation (1 credit) and water use reduction at 20% (1 PALENC Vol 2.indd 757 7/9/2007 1:24:33 µµ
5 758 2nd PALENC Conference and 28th AIVC Conference on Building Low Energy Cooling and credit). Moreover, measures for energy efficiency suggested are: optimise and calculate energy performance, keeping records data for the energy consumption. Again each of the measures implemented give 1 credit each. For materials use environmental aspect and for 1 credit each is suggested: construction materials management at about 50%, materials reuse at 5%, materials selection with recycled content at 10%. Finally and for indoor environment quality the measures suggested for 1 credit each are: ventilation increase, construction of IAQ Management Plan, low emitting materials use such as paints and coating and carpets and systems controllability for instance, lighting control systems. 4. CONCLUSIONS The rating systems analysis and comparison depicted LEED and BREEAM as the most popular rating systems. Therefore the two rating systems were implemented at the design and construction phase of the offices at the multiuse building in the centre of Thessaloniki in Greece. The evaluation process concerns the present situation without any significant changes to the construction. The BREEAM evaluation process evaluated the construction phase with almost 32 credits which means that extra work should be done for offices to be certified (certified credit is 36), so the present situation without any changes is not adequate enough for BREEAM certification. Moreover and based on LEED environmental criteria for new construction the present situation was reevaluated. The building earned 30 points and according to LEED certification process it could be certified (certified credits 26 up to 32). It is essential to remark that certification process is not an easy task as appropriate evidence and documentation should be provided to the auditors so the entire project for the time being is more of a self control checklist rather than a certification project. LEED, LEED-NC Green Building Rating System New Construction and Major Renovations, Version 2.2, (2005), Oktober, USA Scheuer C.W., Keoleian G.A., (2002), Evaluation of LEED using Life Cycle Assessment Methods, National Institute of Standards and Technology, September, USA United Nations Environment Programme (UNEP), (2006), Sustainable building and construction initiative, USA Fowler K.M., Rauch E.M., (2006), Sustainable building rating systems - Summary, Pacific Northwest National Laboratory, Department of Energy, July, USA Papadopoulos A.M., Giama E., Ioannidis I., Management Tools and Systems for the Labelling of Public Buildings, 2006, Healthy Buildings Conference, Lisboa LEED rating system: U.S. Green Building Council (USGBC) BRE, Centre for Sustainable Construction, OECD, Organisation for Economic Cooperation and Development, ACKNOWLEDGEMENTS To the Hellenic State Scholarship Foundation for funding the second author s PhD studies. REFERENCES Building Research Establishment (BRE) Ltd, (2006), The environmental rating for homes Developer sheets, Issue 1.1, August, UK Building Research Establishment (BRE) Ltd, (2006), BREEAM Offices Pre assessment Estimator, UK Building Research Establishment (BRE) Ltd, (2006), Ecohomes 2006 Summary of changes compared to Ecohomes 2005, UK Xenergy Inc. Portland, Oregon and Sera architects, (2000), Green City Buildings: Applying the LEED Rating system, June, USA PALENC Vol 2.indd 758 7/9/2007 1:24:33 µµ
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