Exaquantum Achieves Energy Savings in Building Management System / Mori Building, Japan

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About Mori Building Co., Ltd.

Mori Building Co., Ltd., Japan
Exaquantum Achieves Energy Savings in Building
Management System / Mori Building, Japan

- Roppongi Hills Mori Tower-
Mori Building is one of the leading property developers in Japan, with consolidated annual sales of US$1.4 billion in 2004. Mori Building owns 127 buildings and many of them are located in the center of Tokyo. The Roppongi Hills Mori Tower (Mori Tower) is a well known ultramodern skyscraper that was built in 2003. It has a total floor area of 380,000 square meters on fifty four aboveground levels and six underground levels. The building houses offices, restaurants, shops, and a museum, etc.

The Challenges for Mori Building

Major property developers such as Mori Building are obliged by the Japanese government to reduce energy consumption and report actual results each year. For this reason, Mori Building chose to construct a control system for the Mori Tower which enabled the unified management of data from widely distributed locations throughout the structure. To gather this data, Mori Building selected Exaquantum, Yokogawa's information management system.

Reasons for Selecting Yokogawa's Exaquantum

Mori Building selected Exaquantum for the following reasons:

  1. Ease of viewing data
    Exaquantum has an Excel add-in function that simplifies the task of exporting current and historical process data to an MS-Excel spreadsheet and makes it possible for users to customize their data viewing windows.
  2. Easy data management without the need for professional database design skills
    Exaquantum does not require the design of a detailed database structure: users only need to define tag names. Once Exaquantum is installed, the corresponding data are automatically stored in Exaquantum and the user can collect and manage the data easily.
  3. Support of the OPC standard communication protocol
    Since the Mori Tower had already adopted OPC (OLE for Process Control) for its central monitoring system, Exaquantum was able to connect with existing OPC servers without any special modifications. In other words, there was no need to develop a new interface driver.


With Exaquantum, an optimal building energy management system (BEMS) could be constructed that reduced the Mori Tower's energy consumption. Exaquantum brings the following advantages:

  1. Improved analysis of energy consumption
    In an Exaquantum window, operators can monitor the amount of energy consumed to produce warm and chilled water, which is shown in relation to total energy consumption on a primary energy basis. Data exported to MS-Excel can be displayed in an easily understood pie chart or bar graph, simplifying the analysis of data. Based on the current and historical data, the user can analyze actual performance and establish targets for energy efficiency and cost effectiveness.
  2. Ability to monitor the impact of changes in outside air intake
    The intake volume of outside air can be adjusted seasonally to reduce energy consumption. This is done in the winter by increasing the intake volume to minimize the consumption of chilled water by the air conditioning system, and in the summer by decreasing the intake volume to reduce the load on the air conditioning system and maintain desired carbon dioxide levels. With Exaquantum, the energy savings achieved through these adjustments in the outside air intake volume can be monitored in a window.
  3. Ability to monitor the efficiency of a chilled water transportation system
    The efficiency of the chilled water transportation system is indicated by the Water Transportation Factor (WTF). The WTF is calculated by dividing transported calories by the electric power consumption (KWh) of a chilled water pump. If the WTF is higher than 35, the pump is considered to be operating efficiently. The figure plots WTF data from April 2004 to August 2004. Most dots are below the WTF=35 line, where the WTF value is higher than 35. This chilled water transportation system can be considered to be operating within the WTF standard. The data needed to calculate WTF can be dragged and dropped into an Excel spreadsheet using Exaquantum's Excel add-in function.

Customer's Satisfaction

Mori Building's operators are most satisfied with having unified access to widely distributed data and with the data management system's ease of use. They are also pleased with the ease with which Exaquantum can be connected with existing systems and with its support of OPC.

: Exaquantum

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