CASBEE: ENERGY RATING SYSTEM SUBMITTED BY:- AAYUSHEE DAS ROLL NO.- 75116001 B.ARCH, 7TH SEMESTER

The Beginning There has been a growing movement towards sustainable construction since the second half of the 1980s, leading to the development of various methods for evaluating the environmental performance of buildings

Introduction Comprehensive Assessment System for Built Environment Efficiency (CASBEE), a system created in 2001. Japanese Green Building Council (JaGBC) has developed a comprehensive family of green building rating tools for many markets and building types. The CASBEE rating systems are designed to analyze building performance at several stages in the building lifecycle. The system comprehensively assesses the quality of a building based on its environmental awareness in using building materials and equipment that have little environmental impact, while also taking into account other criteria such as the level of comfort of an interior or the views

The Beginning CASBEE was developed according to the following policies: 1) The system should be structured to award high assessments to superior buildings, thereby enhancing incentives to designers and others. 2) The assessment system should be as simple as possible. 3) The system should be applicable to buildings in a wide range of building types. 4) The system should take into consideration issues and problems peculiar to Japan and Asia.

Framework of CASBEE Building Lifecycle and Four Assessment Tools Figure 1. The cyclical process of building design

Assessment tool Corresponding to the building lifecycle, CASBEE is composed of four assessment tools, CASBEE for Pre-design, CASBEE for New Construction, CASBEE for Existing Building and CASBEE for Renovation, and to serve at each stage of the design process. CASBEE Family is the collective name for these four basic tools and the tools for specific purposes. Each tool is intended for the specific purpose and target users, and is designed to accommodate a wide range of building types (offices, schools, apartments, etc.).

CASBEE for Specific Purpose Application Name For Detached Houses CASBEE for Detached Houses (for New Construction, for Existing Building) For Temporary Construction CASBEE for Temporary Construction Brief versions CASBEE for New Construction (Brief Version), for Existing Buildings (Brief version), for Renovation (Brief version) CASBEE for Urban Development (Brief version) Local government versions CASBEE-Nagoya, CASBEE-Osaka, CASBEE-Yokohama etc. For Heat Island effect CASBEE for Heat Island For Urban Development CASBEE for Urban Development For Cities CASBEE for Cities For Market Promotion CASBEE for Market Promotion

Assessment system A building is rated on a five-class assessment system: S (excellent) A (extremely good) B+ (good) B- (rather poor) C (poor) A building rated A or above is deemed to be excellent and sustainable (an environmentally friendly building)

Assessment method Two Categories of Assessment: Q and L Under CASBEE there are two spaces, internal and external. Thus we have put forward CASBEE in which the "negative aspects of environmental impact which go beyond the hypothetical enclosed space to the outside (the public property)" and "improving living amenity for the building users" are considered side by side. Division of assessment categories for:- Q : Built Environment Category and L: Built Environment Load Based on the hypothetical boundary

Target Fields and Its Rearrangement Environmental Labeling Using Built Environment Efficiency (BEE)

BEE Representation BEE values are represented on the graph by plotting L on the x axis and Q on the y axis. The BEE value assessment result is expressed as the gradient of the straight line passing through the origin (0,0). The higher the Q value and the lower the L value, the steeper the gradient and the more sustainable the building is. Using this approach, it becomes possible to graphically present the results of built environment assessments using areas bounded by these gradients. The figure shows how the assessment results for buildings can be ranked on a diagram as class C (poor), class B-, class B+, class A, and class S (excellent), in order of increasing BEE value.

YOKOHAMA DIA BUILDING CASESTUDY

YOKOHAMA DIA BUILDING Class S- CASBEE The highest level in an assessment system for evaluating building environmental effeciency (CASBEE Yokohama) First Mistsubishi Logistics building to be rated as “Class S”. In this assessment system, Yokohama City focuses on four main areas: Global warming measures Heat island measures Longevity measures Consideration to the city landscape

Global warming measures The exterior wall facing Yokohama Station boasts Japan's largest building material-integrated photovoltaic panels. The building's heat load is reduced through the application of natural energy as well as auto-control blinds that use a solar homing sensor and lighting controlled by daylight sensors. Photovoltaic panel

Solar power system integrated with building materials Solar panels are installed on the west side of the building. Cell’s density designed at 50% to ensure the view while shielding sunrays. Behind the panels, Fine Floors catwalks and louvers are installed to admit air and treat the exhaust air.

Solar tracking system with automatic control blinds The automatic solar tracking sensors detect the presence of sunrays and adjust the angles of the blinds slats to prevent direct sunlight from entering the building’s interior. When there are no direct rays, the system opens the slats to provide better view while admitting maximum daylight indoors, achieving a reduction in power consumption by illumination.

Heat island measures Lowering the effect of heat with rooftop gardening and other measures, environmental impacts are also reduced by using outdoor air to cool the building when external air temperature is lower than room temperature during the winter and inter-season periods.

Longevity measures Building sway is counterbalanced by vibrating weights with a computer-controlled driving mechanism. In addition, a hybrid vibration damping mechanism that combines active mass damper (AMD), to reduce vibration caused by wind, and vibration damping equipment (vibration damping brace, vibration damping wall) is used to increase the building's durability.

City landscape considerations Improvements to the public arcade that connects Yokohama Station and the Port Side area have contributed greatly to the development of a pedestrian walkway network. A pocket park was also added to provide a bit of space for relaxation. Walkway-like open spaces and pocket parks are provided on the ground level in the external area. Some of the third floor is designed for pedestrian network in the district.

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