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Faรงade design strategies that can provide an optimal balance of energy efficiency with occupant comfort and well-being Helen Sanders SAGE Electrochromics, Inc.


The Façade Design Challenge

•  • 

Too hot? Too much glare?

Low Energy Consumption

Occupant Thermal & Visual Comfort

• 

Too much heat gain/loss?

• 

Inadequate solar control?

• 

Daylight not harvested?

Daylight & Views

How do you achieve all three goals simultaneously?


How do we prevent this?

Heat and glare can counteract the positive benefits of daylight and views


And this?


And this?


And not not end up with faรงades like this?


Integrated Dynamic Façades Dimmable ligh%ng  control   Dynamic  glare  control  

Energy efficient  fenestra%on   § Low  u-­‐factor   § Dynamic  solar  control    

Effec%ve dayligh%ng  design    

=> Control systems for fenestration and electric lighting integrated for optimum performance


Impact of lighting controls 7800

Annual Energy Use (Source)

No lighting controls

Expected shape  of     energy  performance   in  a  high  performance   building     Op8mum  window  to  wall   ra8o  (WWR)  depends  on   many  factors:   •  Climate  zone   •  Orienta8on   •  Glass  VT,  SHGC,  u-­‐factor   •  Depth  of  daylight  zone   •  Interior  design   •  Dimming  control  details  

With continuously dimming lighting controls 7600

7400

7200

7000

6800

6600

0

10 20 wall 30 Window to ratio

WWR, %

40

50

Most energy efficient design


Pathway to Net Zero Energy Buildings: Integrated Faรงades Annual Energy Usage Over Current Stock, in Quads: -3

Faรงade Technology:

-2

-1

0

Current Building Stock Average Properties of Windows Sold Low-e Dynamic low-e Triple Pane low-e Highly Insulating Dynamic Windows Integrated Insulating Dynamic Faรงades

Data from Arasteh et al., LBNL report number 60049

Heating Cooling Lighting


Highly Glazed Solutions for Sustainable & Elegant Architecture

Beyond Compliance: Energy Efficient Solutions presentation  
Beyond Compliance: Energy Efficient Solutions presentation  

Beyond Compliance: Energy Efficient Solutions presentation by Dr. Helen Sanders, Sage Glass - Facades+ Chicago 2015 conference