Introducing CO2 Reduction Technologies

Introducing CO2 Reduction Technologies at the Hulic Head Office Building

Solar panels are installed on the rooftop, and rainwater is used for flush toilets. LED lighting systems are adopted in the entire building including office rooms. Brightness is adjusted with daylight detecting sensors. To improve heat insulation performance of exterior walls, Low-E pair glasses and wood blinds are used.

Natural Ventilation and Natural Lighting System Developed through Joint Research with the Massachusetts Institute of Technology (MIT)

Natural Ventilation System

If the load from air conditioning can be lessened by making the maximum use of natural energy to curb energy consumption, CO2 emissions can be reduced significantly. To introduce a natural ventilation system, joint research with MIT was conducted, in which the flow of air and other factors were meticulously simulated. The natural ventilation used in the Hulic Head Office Building is not simply an auxiliary system for mechanical air conditioning. It was actually used to successfully cool the entire building during seasonal intervals. A silencer chamber is also used for the intake opening, which worked to realize the use of a natural ventilation system in a dense urban area with high-level noise.

Cross-Sectional View of Natural Ventilation

Natural Lighting System

Our natural lighting system uses specially shaped natural lighting anidolic louvers co-developed with MIT to capture constantly changing sunlight on the ceiling of rooms during changing seasons and times (elevation and orientation) without the use of power. Highly reflective metal panels are used for interior ceilings, which supply a consistent amount of pleasant natural light to the top of office desks. This system has been installed at the Hulic Head Office Building as well as at the Hulic Shinjuku Building and other buildings.

Image of natural lighting

Effects of CO2 Reduction

<Calculations at the Hulic Head Office Building>

CO2 can be effectively reduced by introducing such top-level environmental technologies. In CASBEE (Comprehensive Assessment System for Built Environment Efficiency), BEE scored 3.3, corresponding to rank S.

  • PAL(*)= 225 MJ/year ㎡ … Standard value of office buildings minus 25%
  • ERR(*)= 35% … The highest class in the energy-saving performance standard of Tokyo metropolitan government
  • CO2 emissions reduction= 40% reduction compared to an average office building in the Tokyo Metropolitan Government's energy efficiency performance standards.
    = CO2 emissions throughout the building's entire life cycle were reduced by 30%
  • * PAL=An assessment indicator for the energy efficiency of building plans and envelope (exterior walls and roof, etc.)
  • * ERR= Shows the percentage by which primary energy consumption has been reduced in facilities and systems

Commercialization of environmental technologies

Natural lighting system (patent awarded)

The natural lighting system was developed as a result of a three-year research/development project that Hulic engaged in with the Massachusetts Institute of Technology. With a specially designed natural lighting louver(anidolic louvers), it can take in a certain amount of sunlight to the ceiling surface of a room without using electricity in accordance with different seasons and times of day. The greatest features of this system are that it realizes a comfortable level of illuminance with natural light, which was previously unattainable, and also that it has a simple, maintenance-free structure even though it comes with a fixed type.

【Summary of patent】
Name of invention: Lighting louver unit
Registration No.: 6021103
Registration date: October 14, 2016

Photovoltaic panels (patent awarded)

The special feature of Hulic’s photovoltaic panels co-developed with Taiyo Kogyo Corporation and Gifu Plastic Industry Co., Ltd. is that they are lightweight, freely designable, and easy to install. We realized a lightweight photovoltaic panel with high strength by using aluminum board and plastic-based honeycomb-panel material. Its weight is about half that of a conventional solar panel. The panel can be freely designed through customization and can be made in various shapes. Equipped with a sliding mechanism using a special metal fitting, it can be relatively easily installed. Thus, it can be installed even in a building with strict loading conditions such as in repairing works.

【Summary of patent】
Name of invention: Photovoltaic generation system and assembly method
Registration No.: 6018856
Registration date: October 7, 2016

Photovoltaic panels (patent awarded)

Commercialization of thin-layer wall greening system

As a part of environmental business, Hulic jointly has developed with other companies a wall greening system (thin-layer wall greening system) that can be easily installed in existing buildings. We completed development of the product and obtained a joint patent for it with three companies.

Commercialization of thin-layer wall greening system
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