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Green Technologies

Environmental Activity

Environmental-friendly Design

In addition to examining whether our design products meet the demand of the clients as well as the social requirement, and how we can minimize the cost, the design departments of each divisions group also consider green aspects.
We proactively make proposals to our clients for the purpose of reducing environmental impact, based on our proprietary technologies. The breakdown of our initiatives is shown in the figure below.

In the civil engineering divisions group, 105 green design proposals were made in 24 projects, focusing on "technologies related to the global environment and energy resources," "technologies related to noise and vibration mitigation," "technologies related to air pollution," and "technologies related to landscaping preservation".
In the building construction divisions group, a total of 668 green design proposals were made for 25 projects. The percentages and ratios of "technologies related to the global environment and energy resources" and "technologies related to landscape preservation " remained unchanged from last year, accounting for almost 60% of the total. There were no major changes in the ratios of the other categories.

Environmental-friendly Design Proposals by Category

Green Design and Construction

Zero Energy Buildings (ZEB)

In light of the target to achieve carbon neutrality by 2050, the clients' awareness of energy conservation and the use of renewable energy is continuously rising. In this context, we are proposing the application of Zero Energy Building(ZEB) technologies.
Our target for FY 3/26 is increasing the percentage of ZEB buildings to 50% or higher of all design/consulting projects undertaken by POC.

<ZEB construction in FY 3/23>
[ZEB]: 3 cases
1. POC Muroran Factory
    (Completion in September 2022, Usage:Factory and offices, Structure:S, 2 stories)
2. Kobe Sumiyoshi Refrigerated Warehouse, Japan Port Industry
   (Completion in December 2022, Usage:Warehouse, Structure:S, 4 stories)
3. GLP Hiroshima Ⅱ Project
   (Completion in January 2023, Usage:Warehouse, Structure:S, 5 stories)

[ZEB Ready]: 3 cases
1. Prologis Park Kobe 3
   (Completion in December 2022, Usage:Warehouse, Structure:S, 4 stories)
2. GLP Okinawa Urazoe project
   (Completion in February, 2023, Usage:Warehouse, Structure:S, 4 stories)
3. Uozaki Refrigerated Warehouse, Japan Port Industry
   (Completion in December 2022 Usage:Warehouse, Structure:S, 4 stories)

<Obtained ZEB Planner certification >
The certifier, Sustainable Open Innovation Initiative, registers corporations that provide consultation services and business support for designing ZEB and other energy-efficient buildings. We will continuously make ZEB conversion proposals, subsidy applications, etc. to our clients.
In addition, we introduced a ZEB Planner evaluation system in propotion to annouced orders received during FY 3/23 and report of orders received, to evaluate the achievement with a maximum 5-star rating for each building size (TFA).


Calculation method of ZEB conversion rate
·For middle-scale (between 300m2 and 2,000 m2) & small-scale (up to 300m2) buildings :
ZEB conversion rate = (Number of ZEB projects designed in a single year)/ (Number of all projects designed in a single year)

·For large-scale (2,000 m2 and larger) buildings :
ZEB conversion rate = (TFA of ZEB sections designed in a single year) / (TFA of all buildings designed in a single year)


BELS Certification

BELS is an abbreviation for Building-Housing Energy-efficiency Labeling System, a system in which a third-party organization evaluates and certifies the energy-saving performance of new and existing buildings. The rating is indicated with 5 stars according to the performance of the building.

What is a ZEB?

Zero Energy Building, pronounced "zebu" in Japanese, refers to a building that aims to reduce the annual primary energy consumption the building to zero while achieving a comfortable in-building environment. Energy consumption cannot be completely reduced to zero only through every saving because of human activities inside the building. We strive to achieve zero consumption on a net basis by supplementing the used energy with newly created energy.

Exterior wall specifications: Reinforced roof insulation
Air conditioning equipment: Use of highly-efficient equipment and application of segmented operation control
Ventilation equipment: Use of highly-efficient ventilation fans, CO2 sensor operation control
Elevators: Addition of power re-generation function
Energy creation: Solar power generation

ZEB Conversion of a Factory and Hydrogen Energy Demonstration

We are conducting verifications at our own facilities to promote the use of renewable energy and the creation of highly energy-efficient buildings in order to achieve carbon neutrality.

Currently, we are constructing a new Muroran Factory, which mainly manufactures temporary steel structures for offshore wind farm construction, and plan to convert the entire factory to net zero energy (ZEB), including the attached offices. In addition, we will apply the hydrogen energy both for actual use and verification purposes, as a renewable energy source.

Considering the cold climate of the site, we will improve the energy efficiency of the factory office by adopting plastic sashes for better heat insulation, reduce lighting during daytime by diffusing daylight with special film, and introduce high-efficiency air-conditioning equipment designed for cold climates, as well as sensor control of these apparatus. Energy reduction rate in the office as a result of these energy conservation measures is expected to be 62%.

As for energy creation, we will install photovoltaic power generation (670kW output) and hydrogen fuel cells (30kW output) on the roof of the factory to provide green power for not only the office but also all the electricity and power needs of the factory, thus making the entire plant ZEB.

For the use and demonstration of hydrogen energy, we will make use of (1) hydrogen byproduct and (2) green hydrogen produced from surplus electricity generated by solar power generation. By-product hydrogen will be stored in tanks (storage capacity: 900 Nm3 x 2 units), and electricity generated by fuel cells will be used constantly in a part of the office. Green hydrogen is produced by a water electrolyzer (production volume: 3Nm3/h) using surplus electricity from solar power generation, stored in hydrogen storage alloys (storage volume: 300Nm3), and used to generate electricity by fuel cells for daily use when necessary, or during BCP measures.

Through these efforts, we will accumulate expertise on the ZEB conversion of buildings and factories, as well as the use of hydrogen energy. In order to achieve carbon neutrality, we will take on the challenge of green energy fields, such as the construction of offshore wind power farms and the ZEB conversion of buildings.