ENVIRONMENTAL FACADE

GREEN TECHNOLOGY FOR SUSTAINABILITY

Architectural Practice must embrace design for green buildings, as a vital element in a sustainable society. Many green buildings incorporate curtainwall facades that address the issues of environmental performance and material recycling. Through our experience in Japan’s harsh environmental and climatic conditions, we have pioneered new environmental technologies. While collaborating closely with Architects, we are able to share the knowledge we have gained. We aim to realize their concepts, offering engineered curtainwall solutions that encompass all elements of design, procurement, manufacturing, construction, and maintenance, and at the same time, bring  us closer to a sustainable society.

Categories of environmental facade

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Externalblinds type

  • Blinds are located on the interior side
  • The heat from solar gain is absorbed, reflected by blinds on the interior side and is radiated from the room.
  • Solar shading property is low.
  • Thermal Insulativ

Solar heat gain coefficient

η=0.05~0.10 η=approx.
Thermal transmittance
U=1.5 2.4 W/m2 K U=approx.
*Above values vary with the property of glass and blind

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Low-E glass & internalblinds

  • Blinds are located on the interior side
  • The heat from solar gain is absorbed, reflected by blinds on the interior side and is radiated from the room.
  • Solar shading property is low.
  • Thermal Insulativ

Solar heat gain coefficient

η=0.05~0.10 η=approx.
Thermal transmittance
U=1.5 2.4 W/m2 K U=approx.
*Above values vary with the property of glass and blind

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Mechanicallyventilatedtype

  • Blinds are located on the interior side
  • The heat from solar gain is absorbed, reflected by blinds on the interior side and is radiated from the room.
  • Solar shading property is low.
  • Thermal Insulativ

Solar heat gain coefficient

η=0.05~0.10 η=approx.
Thermal transmittance
U=1.5 2.4 W/m2 K U=approx.
*Above values vary with the property of glass and blind

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Naturally ventilatedtype

  • Blinds are located on the interior side
  • The heat from solar gain is absorbed, reflected by blinds on the interior side and is radiated from the room.
  • Solar shading property is low.
  • Thermal Insulativ

Solar heat gain coefficient

η=0.05~0.10 η=approx.
Thermal transmittance
U=1.5 2.4 W/m2 K U=approx.
*Above values vary with the property of glass and blind

Thermal property of facade & thermal load of perimeter zone

The relation between solar shading/ thermal insulation property of facade and thermal load of perimeter zone can be described as below.

 

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In a warm area such as Tokyo, cooling loads account for the bulk of heating and cooling loads, the superior solar shading property of the facade is effective in reducing thermal loads all year round. It is vital to select the right facade system, with careful consideration of the balance between solar shading property and thermal insulation property, taking the region and orientation into account.

Solar shading property is high = Low cooling load and high heating load[Figure 1-(A)]

Thermal insulative property is high = High cooling load and low heating load[Figure 2-(C)]

Thermal property of facade and interior comfort

For occupants of the building interior, comfort is important, not just energy saving. To secure comfort in the perimeter zone close to the facade, the temperature of the interior surface of the facade must be maintained at an appropriate level.

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*A facade with superior solar shading and thermal insulation property mitigates the impact of the changing exterior environment, reducing changing in the interior surface temperature of the facade to maintain comfort in the interior. Selection of the right facade system is also important for interior comfort as an assessment indicator.

Summer & Intermediate Season

When the solar heat raise the temperature of the interior surface. → Room is maintained at an appropriate level but occupants around window feel hot.

Winter

When nighttime and cloudy weather fall the temperature of the interior surface. → Room is maintained at an appropriate level but occupants around window feel cold.

*A facade with superior solar shading and thermal insulation property mitigates the impact of the changing exterior environment, reducing changing in the interior surface temperature of the facade to maintain comfort in the interior. Selection of the right facade system is also important for interior comfort as an assessment indicator.

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