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Radiant Heat and Comfort
Power*e™ Glass windows provide comfort at lower room air temperatures by increasing the radiant heat in the room. They work by directly warming you and other objects in the room - not by directly heating the air.
Radiant heat is not new. Water and steam radiators have been used to heat buildings for years. However, Power*e™ Glass windows improve upon other systems because their profile room view “sees” and warms all of you and stops building heat loss through the heated windows. Like the light from a lamp, Power*e™ Glass windows quickly cast a warm heat that is absorbed and re-radiated until all of the occupants and room surfaces become evenly comfortable.
You truly can feel the heat from the Power*e™ Glass. Power*e™ Glass delivers approximately 136 BTU/sq. ft. of glass to the interior side of a window when operated at a glass surface temperature of 115ºF, and the delta T (temperature differential between the interior and exterior) is 60ºF. Additionally, the heated Power*e™ Glass stops all of the heat otherwise lost through the windows from the interior - essentially giving the windows a higher R-value than other windows.
Power*e™ Heat Loss Example
What does this mean to those who design buildings and heating systems? In the simple case of a 60 ft. X 40 ft. building with 8’ walls and 250 sq. ft. of windows:
• Wall R values are 19
• Ceiling R value is 24
• Window R value is 2
• Air changes per hour is .2
• Inside - outside temperature difference is 60ºF
Running this data through a heat load calculator using a delta T of 60ºF yields an hourly building heat loss of 27,983 BTU/hr. Of this total, 26% of the heat loss or 7,500 BTU/hr is lost through the windows.
If all 250 sq. ft. of the windows are Power*e™ Glass operated at 115ºF, the Power*e™ Glass yields 148% of the 27,983 BTU/hr needed to heat the space as follows:
• Power*e™ radiant heat to the interior - 34,000/hr (250 sq. ft. X 136 BTU/hr glass output)
• Stopping all heat loss through the windows - 7,500 BTU/hr
• Power*e™ Glass total heating contribution - 41,500 BTU/hr
Many studies have confirmed that thermal comfort is determined by a combination of radiant heat and air temperature in a room - air temperature alone is not enough. Thus radiant heating systems such as Power*e™ Glass windows can keep you warm and comfortable by increasing the radiant heat in the room even though the room air temperature is kept lower. This savings from lower air temperatures can be significant. For example, a 5ºF to 8ºF reduction in air temperature can mean an additional 8% to 10% energy savings.
Power*e™ Glass windows provide comfort at lower room air temperatures by increasing the radiant heat in the room. They work by directly warming you and other objects in the room - not by directly heating the air.
Radiant heat is not new. Water and steam radiators have been used to heat buildings for years. However, Power*e™ Glass windows improve upon other systems because their profile room view “sees” and warms all of you and stops building heat loss through the heated windows. Like the light from a lamp, Power*e™ Glass windows quickly cast a warm heat that is absorbed and re-radiated until all of the occupants and room surfaces become evenly comfortable.
You truly can feel the heat from the Power*e™ Glass. Power*e™ Glass delivers approximately 136 BTU/sq. ft. of glass to the interior side of a window when operated at a glass surface temperature of 115ºF, and the delta T (temperature differential between the interior and exterior) is 60ºF. Additionally, the heated Power*e™ Glass stops all of the heat otherwise lost through the windows from the interior - essentially giving the windows a higher R-value than other windows.
Power*e™ Heat Loss Example
What does this mean to those who design buildings and heating systems? In the simple case of a 60 ft. X 40 ft. building with 8’ walls and 250 sq. ft. of windows:
• Wall R values are 19
• Ceiling R value is 24
• Window R value is 2
• Air changes per hour is .2
• Inside - outside temperature difference is 60ºF
Running this data through a heat load calculator using a delta T of 60ºF yields an hourly building heat loss of 27,983 BTU/hr. Of this total, 26% of the heat loss or 7,500 BTU/hr is lost through the windows.
If all 250 sq. ft. of the windows are Power*e™ Glass operated at 115ºF, the Power*e™ Glass yields 148% of the 27,983 BTU/hr needed to heat the space as follows:
• Power*e™ radiant heat to the interior - 34,000/hr (250 sq. ft. X 136 BTU/hr glass output)
• Stopping all heat loss through the windows - 7,500 BTU/hr
• Power*e™ Glass total heating contribution - 41,500 BTU/hr
Many studies have confirmed that thermal comfort is determined by a combination of radiant heat and air temperature in a room - air temperature alone is not enough. Thus radiant heating systems such as Power*e™ Glass windows can keep you warm and comfortable by increasing the radiant heat in the room even though the room air temperature is kept lower. This savings from lower air temperatures can be significant. For example, a 5ºF to 8ºF reduction in air temperature can mean an additional 8% to 10% energy savings.