Roadmap

To overcome this pressing issue which can no longer be ignored, Daiken Sekkei is making use of the various environmental technologies which we have developed, to maximize the environmental asset value of clients’ buildings.

• Airflow simulation
• Water Flow Simulation
• Equipment commissioning

Our efforts at Daiken Sekkei

Since September 2022, we have been purchasing carbon neutral LNG as the main energy source for the Daiken Sekkei Osaka Building.

What is ZEB?

Without degrading the quality of the internal or external environment, ZEB buildings achieve broad energy savings through load reduction, use of natural energy, increasing facility system efficiency, and others, while introducing sustainable energy to result in a zero or net positive (supply > demand) annual accumulated balance of energy supply and demand during building operation.
*ZEB is an acronym for Zero Energy Building

ZEB Initiatives (ZEB Planner Registration Number ZEB29P-00103-CP)

Daiken Sekkei has a department for environmental technology patents, and believes in contributing to climate change mitigation on a global scale and helping clients reduce energy consumption and emissions of CO2 and other greenhouse gases as a company mission. In order to use our experience with energy consumption reduction design to become involved in a large number of ZEB projects, we are expanding the ZEB retrofitting of buildings using mainly the following approach.

ZEB Effectiveness

• Explain the importance of ZEB to building owners who are unfamiliar with the concept of ZEB.
• Explain the merits of ZEB retrofitting from the perspective of building asset value and environmental improvement value.
• Plan the building based on the given conditions, and explain the investment cost, energy-saving effects, ROI, etc. to the building owner.
• Compile a total overview of the workflow, including detailed site surveys, designs, design cost estimates, and application forms, in preparation to apply for subsidies.

New government building and disaster management base facility in Matsuno Town (Nearly ZEB)

This facility was designed to symbolize Mori no Kuni Matsuno ("Matsuno, the Land of Forests") with a wood structure (a rigid-frame structure of laminated wood + CLT load-bearing walls) using Matsuno cedar and a wood interior using cypress. In addition, the building achieved a primary energy consumption reduction rate of 81% (a BEI value of 0.19) by acquiring a "Nearly ZEB" certification and a 5-star rating under BELS, achieving top-class environmental performance among government buildings. Furthermore, by utilizing the Ministry of the Environment's FY 2020 subsidy for CO2 emission control measures, the total construction cost of the new government building was reduced by approximately 12%, contributing to a reduction in the financial burden on the town.

High-performance outdoor air conditioner unit (EHP multi air conditioning system)

Total heat exchange ventilation fan

LED lighting (lighting control)

Floor air-conditioning, cool (heat) pit

Photovoltaic power generation system (80kW), lithium-ion storage batteries

Low-E double-glazing glass

High insulation (roof, exterior walls, and under the first floor slab), louvers, eaves

Administrative Wing of the Aichi Gakuin University Meijo Koen Campus(ZEB Ready)

In 2018, a successful application was made for a subsidy for promoting energy consumption reduction investments (project for promoting the introduction of innovative energy saving technology in housing and other buildings) (pilot project for Net Zero Energy Buildings)

solar panels

other solar shading, Low-e multi-layer glass

cool tubes, heat tubes

multi air-conditioner for buildings (EHP)

package units

outside air cooling systems

ice thermal storage systems

radiation rectification blowout systems

LED lighting, brightness detection control systems

occupied room detection control systems

time schedule control systems

SANKO Co., Ltd Tokushima Plant (ZEB Oriented)

Double-glazing glass

Roof insulation (GW1100t)

High-efficiency air-cooled heat pump package unit air conditioner

Total heat exchange ventilation fan

Automatic hot water taps

LED lighting

Variable voltage and frequency control system for elevators and escalators

ZEB Feasibility Study (Osaka Prefectural Suita Higashi High School)

Major Energy-Saving Planning Performance Record

Project for Construction, Operation, etc. of Aichi Prefecture's New Gymnasium

2022 "Plan for Securing Energy Consumption Performance of Buildings Pursuant to Article 12, Paragraph 1 of the Act on the Improvement of Energy Consumption Performance of Buildings"

(Maeda Corporation, Kengo Kuma & Associates, Daiken Sekkei Inc.)

< Main energy-saving technologies >

Double-glazing glass

LED lighting

total heat exchangers

motion sensors

high-efficiency air conditioners

CO2 control

VAV/VWV control

micro-cogeneration waste heat recovery

motion sensor and daylight sensor schedule control

100kW solar power generation

Shin-Tsurumaru Building

2019 "Plan for Securing Energy Consumption Performance of Buildings Pursuant to Article 12, Paragraph 1 of the Act on the Improvement of Energy Consumption Performance of Buildings"

< Main energy-saving technologies >

Low-E double-glazing glass

LED lighting, daylight dimming sensors, room presence sensors

air conditioners, radiation air conditioning (concealed package + radiation panel), total heat exchangers, partially desiccant air conditioning

ZEB Consultation Help Desk

Supervising Office: Headquarters Design Center. Representative: Tomiya

※For ZEB-related inquiries, please use thecontact formbelow.

Major Achievements in Wooden Spaces

Upgrading to higher efficiency heat source systems

When conducting point processing to select business operators to upgrade the heat source in large-scale building redevelopment projects, we conduct surveys on age-related deterioration as well as energy conservation evaluations of all facilities including the central heat source, followed by heat source comparison simulations, and implementation planning and supervision.

Airflow simulation

We verify through simulations whether air-conditioning of the occupied area in a large space is feasible, and then proceed to the implementation design.

Water Flow Simulation

Simulations are used to verify in advance whether there can be an even water flow in the tank and to provide feedback for planning the placement of artificial rocks.

Tennoji Zoo Penguin and Sea Lion Pool

Sea lion pool water flow simulation

Paper presented at the 2023 Conference of the Society of Heating, Air-Conditioning and Sanitary Engineers of Japan:
■ Investigation of Flow Efficiency in a Water Tank for Breeding and Exhibiting Animals using CFD Analysis

Simulation videos are used to verify the smooth flow of water and to determine the optimal placement of artificial rocks.

Commissioning (design verification)・Tuning

We verify the effect and performance of our design; emphasizing how the equipment could be operated as efficiently and reliably as possible.

Meijo Koen Campus, Aichi-Gakuin University

Visualizations of energy consumption results allow us to find areas of operation that can be improved and to speed up energy conservation through repeated tuning. In the cool pit, the humidity conditions used are appropriately reviewed to improve energy efficiency.

Verification through testing of air conditioning in occupied areas

After construction, we verify whether the intent of the design has been realized by testing the air conditioning in occupied areas using smoke tests and other means.

Long-Term Repair Plan Proposal

Preparing a long-term maintenance plan during the operating phase of a building to specify the intervals for replacing expendable items and inspecting/servicing equipment will enable proper maintenance at the appropriate timing.Efficient and well-planned investments contribute to the improvement of asset value. We save energy throughout the life cycle of a building through proper maintenance and efficient renewal work to extend its service life.