CASBEE CERTIFICATION

ENVIRONMENTAL DESIGN

Ann Mary Athulya Geethika Nazla Pournima Shabareesh

Introduction

• CASBEE(Comprehensive Assessment System for Building Environmental Efficiency) , a system created in 2001

• Research and development of CASBEE is a joint industrial/government/academic project established under the support of the Japanese ministry of Land, Infrastructure, Transport and Tourism.

• 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

• 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.

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.

Building Lifecycle and Four Assessment Tools

Assessment tools

Corresponding to the building lifecycle, CASBEE is composed of four assessment tools,

CASBEE for Pre-design,

CASBEE for New Construction,

CASBEE for Existing Building

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 PurposesApplication Name

For Detached HousesCASBEE 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 based 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

• 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 the assessment categories forQ: Built Environment Quality L: Built Environment Load based on the

hypothetical boundary

Target Fields and Its Rearrangement

CASBEE covers the following four assessment fields:

(1) Energy efficiency

(2) Resource efficiency

(3) Local environment

(4) Indoor environment.

The assessment categories were classified as

BEE numerator Q (built environment quality)

BEE denominator L (built environment load).

Target Fields and Its Rearrangement

Q is further divided into three items for assessment:

• Q1 Indoor environment

• Q2 Quality of services

• Q3 Outdoor environment on site.

Similarly, L is divided into

• L1 Energy

• L2 Resources & Materials

• L3 Off-site Environment.

Environmental Labeling Using Built Environment Efficiency (BEE)BEE, using Q and L as the two assessment categories, is the core concept of CASBEE.

Building Environmental Efficiency (BEE) =

Q (Building Environmental Quality and Performance)

L (Building Environmental Loadings)

• The building types targeted for assessment are divided into non-residential and residential categories with specified subtypes under each category.

• The use of BEE has enabled simpler and clearer presentation of building environmental performance assessment results.

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.

• possible to graphically present the results of built environment assessments using areas bounded by these gradients.

From Eco-efficiency to Built Environment Efficiency (BEE)• Eco-Efficiency - "Value of products and services per unit environmental

load.”

• Efficiency - in terms of input and output quantities

• so a new model - expanded definition of Eco-Efficiency - as "(beneficial output) / (input + non-beneficial output)."

• This new model of environment efficiency can be extended to define Built Environment Efficiency (BEE), which CASBEE uses as its assessment indicator.

CASESTUDYYokohama building

Yokohama Dia Building

Class S-CASBEE

• the highest level in an assessment system for evaluating building environmental efficiency (CASBEE Yokohama)

• first Mitsubishi 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.

Initiatives To Preserve The EnvironmentGlobal 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

• with the cell 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 consumptions by illumination.

Initiatives To Preserve The Environment

Exterior of the building

Heat island measures

• lowering the effect of heat with rooftop gardening

• 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.

Initiatives To Preserve The EnvironmentLongevity 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

Initiatives To Preserve The EnvironmentCity 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

CASESTUDYTEDA MSD H2 Low

Carbon Building ,

Tianjin, China

TEDA

Class S-CASBEE

• First international CASBEE certified building

• Located at newly developed TEDA Modern Service District (MSD)

• Densely populated with service industry such as financial and IT companies

• the TEDA MSD H2 Low Carbon Building is demonstrating environmental sustainable urban development.

features the national top level environmental

• photovoltaic generation,

• solar-heat hot water supply system

• geothermal heat pump system

• high-performance and low carbon technologies;

• natural lighting,

• double-skinned facade, .

TEDA

• Implementing management of building energy performance with using BAS (Building Automatic control System) and BEMS (Building Energy Management System -top level energy-saving.

• As a comprehensive green action plan, the project utilizeseco-material and water conservation with reusing water supply system of graywater and designs landscape by planting trees and roof garden.

CASBEE vs. LEEDCASBEE

• its practical application has been limited in Japan.

• fundamentally an ‘architectural’ design tool,.

• most commonly utilized as a ‘checklist for sustainable design, and an official CASBEE certification is rarely pursued

• evaluation items in CASBEE are subjective

LEED

• has been transformed into the “world’s biggest green-building brand name” due to the successful marketing efforts by USGBC.

• comprise or could be dissected into various architectural and engineering elements

• LEED certification is customarily pursued by project owners for marketing and promotional purposes and LEED certified buildings are growing every day

• clearly defined terms

• In Japan, a sustainable building is often defined as one that is designed “to save energy and resources, recycle materials and minimize the emission of toxic substances throughout its life cycle, to harmonize with the local climate, traditions, culture and the surrounding environment, and to be able to sustain and improve the quality of human life while maintaining the capacity of the ecosystem at the local and global levels”

Bibliography

• http://www.ibec.or.jp/CASBEE/documents/CASBEE_news_release(E)140415.pdf

• http://www.ide.titech.ac.jp/~nabe/wp/casbee-vs-leed-how-is-each-

embraced-by-its-building-community/

• http://www.ibec.or.jp/CASBEE/english/backgroundE.htm

THANK YOU