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Reversing Heat Losses from Windows

Increasing The R-Value Of The Window To The R-Value Of The Walls


Jansen Janisol HI


Traditionally, we compare our window system performance against another window system. Our approach differs as we consider the entire building envelope and get to the root of the challenge which is to balance the performance of the windows with the higher performance of the walls.


Our goal is to provide thermal comfort when and where it is needed while reducing energy usage, typically a 20- 25% reduction in heating costs



The Basics:

  • Heat gain through windows in summer is a function of the static efficiency of the coated glass IGUs, the window frames and the quality of installation

  • Heat losses through windows in winter is a dynamic disfunction of the relatively low R-values of the windows compared to the much higher R-values of the walls. (even the best performing window frames with traditional glazing cannot compete with the R-value of the walls) Heat losses through the traditional windows defeat the effectiveness of well insulated walls.


Video Credit; Penn State University

The Solution:


The Functions:

  • Conventional windows become cold in the winter because heat travels through the glass to the colder outside

  • IQ Radiant Glass control systems eliminate the temperature differential between window and wall by sensing the surface temperature of the glass and directing the flow of an electric current through the interior surface of the thin invisible metal coating on the glass

  • The electrical resistance warms the glass and reverses the heat flow

  • When the temperature of glass exceeds inside air temp by 3-5°F, the windows become opaque to further heat loss

  • The smart system is capable of selectively controlling each opening, further conserving the unneccesary use of energy

  • The result is the effective R-values of energized windows increase to the R-value of the walls

  • The radiant heat created on the glass surface selectivly, quietly and efficiently is directed into the room, warming the surfaces of things in the room and providing thermal comfort to the occupants

  • Due to the configuration of the IG units and the higher performance of the thermally broken steel frames, heat losses to the exterior are less than 5% of the heat generated

The Benefits:


The high performance steel windows, glazed with IQ Radiant Glass, achieve additional dynamic levels of energy control, improved thermal comfort and tangible important benefits which include :

  • Focused thermal comfort zones

  • Eliminating the need for floor radiators and vents, allowing increased floor space and greater freedom in furniture placement

  • Eliminating condensation, a sources of mold and odors

  • Airborne pathogens and dust are reduced to nil

  • Reduced heating maintenance costs as there are no moving parts to be replaced

  • Reduced noise levels (no hissing disturbance from forced hot air systems or motors pushing hot water)

  • The healthy radiant heat provides comfort to those that suffer from asthma and arthritis

  • Eliminating the heat stratification, promotes superb thermal comfort while simultaneously allowing for lower interior ambient temperatures, reducing heating costs

  • Radiant heating glass can provide multiple controlled heating zones within the same room

  • COMBATTING THE CLIMATE CRISIS THROUGH BUILDING ELECTRIFICATION - Henderson Engineers

Join us and explore the extraordinary benefits that we can bring to your project:


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