Minato Mirai Center Building

Last Uploaded: April, 2011


Square Office

Special Features

Q-1 Indoor Environment	Sound environment Sound insulation using soundproof sashes (T-2) Use of rock wool acoustic board (for ceilings) and tile carpet (for floors) as sound absorbing materials Indoor thermal environment Adoption of Low-E glass The coefficient of overall heat transmission, U, of exterior walls and windows of 0.88 W/m²-K and 5.17 W/m²-K, respectively, and the shading coefficient, SC, of windows of 0.38 are ensured by the thermal insulation of exterior walls. Air handling units (AHUs) are laid out separately and decentrally (8 sets per standard floor) with respect to each orientation and minimum compartment. Cooling/heating operation is selectable and controllable with respect to each minimum compartment. The use of the atrium in the common area of the office for the pathway of exhaust air to reduce heat load in the corridors, shorten the length of the pathway, and reduce the power required to discharge the exhaust air. Light and visual environments Incorporation of a daylighting system (T-Soleil) that moves in response to the outside environment to let natural light in corridors Daylight control using vertical louvers and horizontal blinds Average illuminance of 750 lux or more (779 lux) in the office Indoor air quality Use of finishing materials rated as F☆☆☆☆ and free of volatile organic compounds (VOCs), such as xylene and toluene Outside air taken into the building from top of the building through an equipment void. A clearance of 6 m or more ensured between the exhaust opening and fresh air inlet
Q-2 Quality of Service	Functionality A floor area of not less than 9 m²/occupant ensured in the office Adoption of free access floor in the office to easily replace wiring Ceiling heights of 2.95 m and 3.8 m ensured in the office on the standard floors and in the retail premises on the 1st to 3rd floors, respectively Layout of smoking room and refreshment space (no smoking) on the standard floors Preparation of interior perspectives and mockups for the study of interior and color plans Durability and reliability High safety with our own structural system that combines seismic isolation and seismic response control systems Adoption of damage control design and seismic isolation structure Adoption of a reliable three-line spot network power reception system for the substation. Installation of emergency power generator Adoption of water-saving toilet bowl and urinal (automatic flushing with motion sensor), automatic water faucet and a function to produce a flushing sound Adaptability and maintainability Story height of 4,150 mm on the standard floors, 6,500 mm on the 1st and 2nd floors and 6,000 mm on the 3rd floor in the low-rise section Floor load of 4,900 N/m² on the safe side on the standard floors Air-conditioning and water supply pipes that can be easily replaced by using the equipment void and air-conditioning machine room on each floor (at 8 locations) Layout of electric pipe shaft (EPS) in consideration of maintainability. Adoption of integrated ceiling and free access floor in corridors and office for easy replacement of cables
Q-3 Outdoor Environment on Site	Conservation and creation of biological environment Creation of rich spaces for creatures to live using large open spaces Formation of networks of greenery connecting to surrounding green zones by introducing endemic species that are seen in potential natural vegetation Layout of trees and consideration of tree types suitable for environmental conditions (including salt tolerance) Setting of indicator species attracting organisms based on the results of bio-assessment around the project site. Provision of spaces to attract birds and butterflies and planting of trees that provide food and ground covers Consideration of townscape and environment Layout plan that considers the buildings constructed before this building in the same block, the landscape having a harmonic unity, and the formation of a skyline that goes up gently at the top of buildings Blue and white exterior appearance forms an impression of Minato Mirai District in Yokohama Exterior design based on vertical lines having a sense of future-oriented rise and a sense of unity with the buildings constructed ahead of this building in the same block Large open space such as a courtyard at the center of the block in coordination with adjacent buildings Increase in the ratio of green coverage with plants of different heights, such as tall trees, bushes, and ground covers, and the create a comfortable landscape with four seasons Consideration of regional characteristics and amenity Pilotis laid out on the periphery of the building at the Keyaki-dori Ave. side to provide urban spaces to take shelter from rain and meet someone, contributing to improving amenity Layout of a variety of open spaces, including recreation spaces such as flower garden, open lawn space, and bustling open spaces such as pergola Construction of access path to Minato Mirai Station that is available even when the building is closed to improve convenience and strengthen the networks of bustle Construction of an inner mall in the building to form an intermediate area between Keyaki Street and courtyard (garden)
LR-1 Energy	Protection of water resources Use of water-saving plumbing fixtures Use of rainwater for watering plants on the roof Use of natural energy Installation of a daylighting system (T-Soleil) Highly efficient equipment and systems Reduction of ERR by 29.8% and CO2 emissions by 32% (calculated from the CASBEE 2008 Edition) Air-conditioning: Adoption of a district heating and cooling system, variable air volume (VAV) and variable water volume (VWV) systems, and total heat exchanger Ventilation: Start/stop control ventilation fan using thermostat and inverter control of ventilation fan in the machine room Lighting: Adoption of highly efficient high-frequency (HF) fluorescent light, and motion sensor control Hot water supply: Individual hot water supply system Elevator: Adoption of a variable voltage variable frequency (VVVF) control system Installation of a daylighting system (T-Soleil) Efficient operation Evaluation of system efficiency using the energy management function of a building energy management system (BEMS) Plan for basic operation and maintenance policies. Promotion of measures to reduce energy consumption based on the plan-do-check-action (PDCA) cycle
LR-2 Resources and Materials	Protection of water resources Use of water-saving plumbing fixtures Use of rainwater for watering plants on the roof Materials that lessen impact on the environment Use of electric furnace steel for beams, and blast furnace concrete for building foundations Use of recycled materials for free access floor and interlocking concrete block pavement for exteriors Building structural frames are prestressed concrete (PC) with paint finish, and windows are unit curtain walls (CWs). They can be taken apart. Recyclable unit members (free access floor and integrated ceiling) Use of thermal insulation materials having zero ozone depletion potential (ODP) and global warming potential (GWP) of less than 50 Use of R410 and R404A having zero ODP for the refrigerant of air-cooled air conditioner and refrigerant
LR-3 Off-site Environment	Air pollution control Introduction of a district heating and cooling system Prevention of noises, vibrations and malodors Outdoor installation of all fans except one exhaust fan. Noise levels below the current standards of the Noise Regulation Act Control of wind damage and sunlight obstruction The ranking of the building by the wind environment assessment is partly higher than the ranking of the site location. Light pollution control Outdoor lighting plan in compliance with the Guidelines for Countermeasures against Light Pollution Adoption of Low-E glass with an opening ratio of less than 50% and low reflectivity Indoor thermal environment Layout of building and planning for open spaces in consideration of the prevailing wind direction in summer. Reduction in artificial exhaust heat by the use of a district heating and cooling system Shaded area accounting for 21.26% of the lot area, a ratio of green coverage of 13.47%, and a ratio of green coverage on the roof of 21.47% Confirmation of the effects of the wind on the building through computer simulation of the wind environment Control of the effects of impact on district infrastructures Planning for the location of an entrance to and exit from the car park and the location of the bicycle park with consideration given to the surroundings Active reduction and recycling of waste

Other Features

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These cases are described based on assessment results obtained using CASBEE.
CASBEE is a method for rating the environmental performance of buildings using Building Environmental Efficiency (BEE) as an indicator, which is based on the results of separate scores obtained for Q-1~Q-3 (Quality) and LR-1~LR-3 (Load Reduction).