NEWS

AWARD

2024.02.01

"SUSTIE" is a prototype office building that is both environmentally friendly and comfortable.

Winner of the Energy Conservation Center Chairman's Award in the Energy Conservation Case Studies category of the 2023 Energy Conservation Awards

Download the release here.

株式会社三菱地所設計（所在地：東京都千代⽥区、代表取締役社⻑：谷澤 淳一）は、2023（令和5）年度省エネ大賞（主催：一般財団法人省エネルギーセンター）の《省エネ事例部門》にて、当社の設計による「三菱電機ZEB関連技術実証棟『SUSTIE』」（竣工：2020年８月）が「省エネルギーセンター会長賞」を受賞したことをお知らせいたします。
本賞は、省エネの推進や優れた省エネ製品の開発を行う事業活動を表彰し、省エネ意識の浸透や関連産業の発展により、省エネルギー型社会の構築に寄与することを目指すものです。

Left: South side. Low-e double glazing and horizontal eaves ensure brightness inside the building while reducing the heating and cooling load.
Right: The "SUSTIE" team was awarded at the Energy Conservation Grand Prize Award Ceremony (Wednesday, January 31, 2024, TOC Ariake, Koto-ku, Tokyo).

A first in Japan! Obtained the highest ranking in three certifications evaluating "environmental friendliness" and "comfort and health"

「SUSTIE」は、徹底した省エネ化を図ることでBELS（建築物省エネルギー性能表示制度）最高評価『ZEB』を取得。また、多数のワーカーが執務にあたるオフィスビルとして高い快適性・健康性ある空間を創出し、CASBEE-スマートウェルネスオフィスで最高評価「Sランク」を取得しました。さらに、建築物の環境性能を評価するWELL認証で最高ランク「プラチナ」を取得し、世界標準の指標により評価されました。「SUSTIE」は、国内で初となる、これら3つの認証を全て最高ランクで取得した建物です。

  1. Joint award winners: Mitsubishi Electric Corporation, Takenaka Corporation, Kodensha Corporation, Mitsubishi Electric Refrigeration and Refrigeration Plant Corporation, and Mitsubishi Electric System Service Co., Ltd.
  2. A building with zero or negative net annual primary energy consumption.
  3. An evaluation by the Institute for Building Environment and Energy Conservation of the specifications, performance, and initiatives of buildings that help maintain and improve the comfort and health of building occupants.
  4. An environmental performance evaluation for buildings developed by the American company Delos. In addition to evaluating ergonomic aspects (such as improved productivity), it is characterized by its emphasis on the wellness (comfort and health) of the people who spend time there. It is internationally recognized as a global indicator.

[Planning and evaluation point 1] Aiming for a "ZEB" office building that can be widely adopted in society

In order to achieve carbon neutrality, there is a demand for the spread of "ZEB" class buildings with high energy-saving performance. However, today's "ZEB" buildings tend to be small buildings with low energy consumption or suburban buildings where solar panels can be installed on a large site, and there are significant site constraints on realizing this goal.
In response to this, "SUSTIE" aimed to create a "ZEB that can be widely adopted," and planned to install solar panels only on the building to demonstrate feasibility in medium-sized buildings (total floor area of 5,000 m2 or more) commonly found in urban areas. We believe that this approach to society was recognized and led to the award.

On the north side (left side of the photo), where the sunlight is milder, large windows facing the indoor atrium are installed to let in light and ensure brightness. On the east and west sides (right side), the outdoor air conditioning units are concentrated to block sunlight and improve insulation.

[Planning and evaluation points ②] Efforts to balance "environmental performance" and "user comfort and health"

In order to spread this technology widely throughout society, it is important that users feel comfortable, but if we increase the amount of ventilation, lighting, and other equipment required for that purpose, this will increase the amount of power consumed by the equipment, which goes against the goal of energy conservation.
Therefore, with "SUSTIE", we first maximised architectural design (passive design) by installing openings that let in natural ventilation and blocking direct sunlight with eaves. After reducing energy consumption in this way, we then introduced highly efficient equipment (active design) and layered it all together in a step-by-step design process. In addition, we used an energy management system to optimise energy production and consumption. By collecting operational data daily, we are continuing to grow the building into one that is even more energy efficient and comfortable.

The atrium faces north. Warm air that gathers at the top is released through the windows, providing natural ventilation throughout the building. This architectural innovation reduces the energy required for air conditioning equipment.
The large staircase, which also serves as a communication space, encourages users to walk between floors and contributes to improving their health.

Technology deployment in "SUSTIE"

We will introduce an example of "SUSTIE" technology and space, which incorporates equipment that leads to improved wellness into a design process that combines architectural ingenuity with highly efficient facilities and equipment.

The "air conditioning and heating panel" is installed facing the south balcony, which takes in outside air. It is made up of multiple steel pipes, and by running hot and cold water through it depending on the season, the outside air is pre-cooled here and supplied to the room, where it flows into the open-ceiling space.
The counter is used as a heating and cooling device (cool warm counter), and hot and cold water panels are installed on the walls around the windows.
Instead of installing lights on the ceiling, indirect lighting was installed on the stairs and counters.
By efficiently controlling air conditioning and lighting "only around people," we have achieved energy savings and improved comfort despite the large space.
Office space. In addition to high-efficiency multi-air conditioners for buildings, we have installed air conditioning systems such as commercially available ceiling-mounted packaged air conditioners and air-type radiant air conditioning systems made of aluminum panels, as well as task and ambient lighting. These measures have achieved both energy savings and comfort.
With "SUSTIE," actual operation began based on equipment operation simulations. Energy consumption, energy creation, and comfort were visualized, and improvements were made based on this, leading to the achievement of a "ZEB."
Schematic cross-section. The south side receives the most solar radiation and heat load, while the north side is relatively calm. The internal functions and spatial layout are optimized to match the orientation.
We utilize natural energy (blue text) and overlay it with highly efficient facilities and equipment (black text).

Architecture

Data

Building Name

Mitsubishi Electric Corporation ZEB-related technology demonstration building "SUSTIE"
location

1-1 Ofuna 5-chome, Kamakura City, Kanagawa Prefecture
Applications

office
Builder

Mitsubishi Electric Corporation
architectural design and construction supervision

Mitsubishi Jisho Design Inc.
Construction

Takenaka Corporation (architectural work), Kodensha Corporation (electrical equipment work), Mitsubishi Electric Refrigeration and Cooling Plant Corporation (air conditioning and sanitary equipment work), Mitsubishi Electric System Service Corporation (photovoltaic power generation equipment work)
Site area

85,131.18 m2
Building area

1,954.52 m²
Total floor area

6,456.32 m²
Floor number

4th floor
Construction type

Steel frame
Completion

August 2020
Certifications

BELS certified Five Star "ZEB",
　

*The information in this release is current as of January 2024 and may be subject to change depending on future operations.
*"SUSTIE" is a registered trademark of Mitsubishi Electric Corporation.

Information on other award-winning projects by our company in the 2023 Energy Conservation Awards

Joint award winners: Takasago Thermal Engineering Co., Ltd., Takenaka Corporation, Kandenko Corporation, Yamato Corporation, Waseda University, and the University of Tokyo.

Contact for inquiries regarding this matter

Mitsubishi Jisho Design Inc. Public Relations Office
TEL 03-3287-5001

Inquiry form
NEWS TOP

Tags

PAGE TOP