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Natural Ventilation for Glass Facades

IQ Radiant Glass® glazing option for operable vents by Jansen VISS or Schüco AWS 102

Schüco AWS 102 vent compatible with IQ Radiant Glass
Open Vent Schüco AWS 102 All-glass façade window

HVAC heating, ventilation and air-conditioning systems in tall office buildings typically account for 33% or more of overall building energy consumption. Of that, more than half of the HVAC energy is due to overcoming the heat gains due to occupants, lighting and miscellaneous computers and electrical power usage. Increased energy efficiency is the path to sustainability. Hybrid HVAC systems should include natural ventilation to reduce the energy burdens of the building systems. In cold climate environments, natural ventilation could be problematic in specific areas. IQ Radiant Glass can help.

Smart buildings and building automation are key components for achieving greater energy efficiency . Specifically, the control and coordination of a building’s heating, ventilation (including natural ventilation), should be integral to the HVAC system, Thermal comfort and fresh air could compliment each other with the use of heating glass vents.

Our basic concept would energize the operable vents, however other fixed openings could also be glazed with heating glass. The reason is basic to human comfort, fresh air and the warmth of radiant heat.

Radiant Heating Glass has the unique ability to provide focused occupant thermal comfort without heating and drying out the air and offers other significant benefits:

  • IQ Radiant Heating Glass produces zonal heat as each piece of glass is individually controlled by the smart building control system and is energized on a demand basis

  • Radiant Heating Glass provides thermal comfort to the occupants and warmth to other surfaces within the discreet zone of the active radiant heating glass

  • Operable vents could be opened in winter to allow for natural ventilation without sacrifice to thermal comfort, relieving the burden on heat pumps and air circulators

  • IQ Radiant Glass mounted in KönigStahl / Jansen Steel VISS Parallel Vent Windows, as well as other similar systems can play a significant role in energy conservation and improvement of thermal comfort

  • Such a system could also be expanded beyond the operable vents.

Historically, heating and air-conditioning design philosophies have focused on obtaining a specific indoor temperature for a given design air temperature. If the design air temperature was achieved in a room, then the occupants were considered thermally comfortable. This approach does not differentiate convective energy from radiant energy exchange.

  1. Therefore, the design air temperature may not accurately represent the occupant’s thermal comfort. One of the most common examples of the air temperature misrepresenting the occupant’s thermal comfort is standing out- side on a cool, calm day. With no radiant heat from the sun, the individual is chilled. All that changes with the sun shining.

  2. Radiant heating glass provides long wave radiation that provide thermal comfort to the occupants in the room, at lower interior air temperatures.

  3. Discomfort caused by thermal asymmetry is eliminated using radiant glass (RG) technology

Obviously every building and every location is different, but the desired result is that such a system can be designed into the HVAC system to facilitate natural ventilation, improve thermal comfort and and gain energy savings


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