High rise glass buildings

are a symbol of progress and elegance. They are dominant elements of modern commercial and institutional buildings.



Glass facades do generally not meet today’s and tomorrow’s energy consumption and comfort requirements. The requirements on a glass facade are contradicting. Protection against excessive sun radiation and high outside temperatures during hot periods, minimized heat losses and use of the radiation for room heating in cold periods are only few of  them.




  • Reduce energy consumption while improving comfort
  • Create comfortable working space also in the direct vicinity of the window
  • Maximize room height by avoiding heating or cooling systems
  • Regenerate geothermal probes during summertime without using heat pumps
  • Provide an efficient heating with low-hub heat-pumps in winter
  • Only robust and simple technology with long life span, no exotic components 
  • Low maintenance cost

State of the art - today's solutions for glass facades

Sunshiled outside

Highly isolated glass facade with sun shield at the building exterior

The heat from sun radiation is generated at the exterior and does not enter the building


  • Simple and physically correct solution, since the heat is generated outside the building

Not so good

  • Risk of sun shield damage due to wind and hail 
  • Sun shield requires expensive cleaning 
  • External sun shield impacts  massively the architectural design
Sunshield Inside

Highly isolated glass facade with sun shield inside

The heat from sun radiation is generated in the interior and therefore requires strong cooling


  • Simple solution 
  • Sun shield well protected against wind, hail
  • The sun shield does not interfere with the architectural design 

Not so good

  • Sun radiation enters the interior and the heat has to be removed
  • Requires glass with extremely low g-value resulting in dark and opaque facades 
  • Reduced comfort due to strong air conditioning
  • Excessive energy consumption 
Duble Skin

DSF «Double-Skin Facade»

A second outside facade protects the inner facade and the sun shield
The heat-induced airflow between the outer and inner facades provides cooling


  • Efficient cooling through natural convection
  • Improved protection against variations in outside temperature
  • Sun shield protected against wind and hail

Not so good

  • Space needed for the second skin and the walkway reduce the usable building size 
  • Expensive cleaning and maintenance of two additional glass surfaces

CCF «Closed Cavity Facade»

A compact, prefabricated window module offers easy cleaning and  transparency
The sun shield inside the module is protected against dirt, wind and hail
Fully dried air has to be provided for each window to prevent condensation inside the cavity


  • Sun shield well protected
  • Interior protected against sun radiation
  • No impact of the sun shield on architectural design

Not so good

  • Extreme temperature fluctuations in the cavity
  • Heat transfer to the interior
  • Detrimental to the sun shield parts
  • Requires dry air supply to avoid condensation 
  • Expensive repairs

Find out how HyWin solves the shortcomings