High Performing Buildings describes measured performance of
practices and technologies to promote better buildings, presenting
case studies that feature integrated building design practices and
improved operations and maintenance techniques.
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Design of the new YKK headquarters started right before the March 2011 earthquake and tsunami in Japan. With the country reassessing its energy supply and its seismic
vulnerability in the disaster's aftermath, the owner and design team had
a chance to reconsider its approach to the new building, choosing an
integrated design process to optimize the whole building as a system.
A CASE STUDY IN THIS ISSUE focuses on their efforts to create one
of the highest performing office buildings in Tokyo. The authors write
that the project was important as a high-performing thermal, visual, and
energy design, and as a resilient design response to a natural disaster.
The building was completed in 2014.
The team agreed on a passive first approach, featuring a “sudare
screen,” or Japanese traditional blind, that was used over the entire
west-facing façade. It blocked and filtered direct solar gain while maintaining daylight and views. Daylighting was maximized by automatic
solar adjustment of the blind slats every 10 minutes.
With solar gain, daylighting, and lighting in place, a high-efficiency
HVAC system could be designed. A custom, radiant ceiling panel heating/cooling system was designed to facilitate integration of hot/cold
water piping with lighting and slight airflow. The airflow concept came
from the memory of a natural breeze under the shade of a tree.
THERMAL LOADS IN THE INTERIOR ZONE, where the temperature does
not significantly change, are met by the radiant ceiling panel system.
The variable thermal load near the exterior windows is met using an
active chilled beam.
Using a detailed three-dimensional building information model and
computational fluid dynamics, comfort verification of the radiant cooling system was confirmed during the design phase. Also, experiments
were conducted in a mock research laboratory to verify comfort in the
areas using the slight airflow. The mock-up research and lab experiment demonstrated compliance with ASHRAE Standard 55-2010.
While the initial investment was greater than that for a similar conventional office building, the authors write that a simple payback analysis shows the additional investment will be paid back in just under 11
years, assuming utility costs do not increase.
However, with a modest productivity gain of 5%, the 11-year payback
period would be less than two years, the authors state. They note that
much higher productivity increases have been documented in other
Enjoy the issue.