ZEB Oriented and the WELL Gold Certification
How We Achieved Both  Part 2

Air conditioning-related systems account for approximately 50% of a building’s energy consumption. To improve energy efficiency, it is important to block solar radiation and reduce the air conditioning load.

Recent office buildings have been adopting multiple-pane glazing for insulation and condensation control, but WORK VILLA MITOSHIRO’s windows are single-pane. Since switching to multiple-pane glazing would involve significant construction costs, thermal insulation film was applied to the glass to limit solar radiation. The lighting level, which accounts for 20% of the building’s energy consumption, was also reduced from 500 to 300 lux. Lighting with an illuminance of 300 lux generates less heat, which also minimizes the necessary capacity for air conditioning equipment.

The air conditioning equipment incorporates a system that greatly reduces power consumption and downsizes the equipment’s capacity. It also automatically controls the intake of outside air based on CO₂ levels, which fluctuate depending on the density of occupants. Additionally, the temperature settings of the environment-selective air conditioning system are tailored to each location, enabling individuals to select the work environment that best suits their thermal preferences and enhancing overall wellness.