A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Theoretical discussions of perfect window, ideal near infrared solar spectrum regulating window and current thermochromic window
Highlights ► Perfect and ideal window models are defined to set the technical ceilings (limitation) for different window technologies. ► The energy saving potential of regulating long wave thermal radiation property of the window is greater than that of regulating the solar spectrum transmissivity. ► The regulating capacity of the current VO2 glass to solar radiation is limited, and the high solar spectrum absorptivity in the metal state leads to higher energy consumption than in semiconductor state. ► The energy saving effect of the current VO2 single glass in summer is because of low transmittance due to high absorption rather than reflection, and the phase transition process has no contribution to its energy saving effect.
Abstract In order to evaluate the energy saving performance of various windows on a common basis, three conceptual window models are presented, and an energy consumption index is defined as the ratio of the energy consumption of a given window to the corresponding value of the perfect window. A building energy analysis program, “BuildingEnergy”, was used to evaluate the energy consumption value of different window models. The following results are obtained: the energy saving potential of regulating the emissivity of the window is greater than that of regulating the solar transmissivity, the optimized phase transition temperature of the ideal near infrared solar spectrum regulating window is between 16 and 21°C, and due to the high absorptivity in the metal state, the single vanadium dioxide (VO2) glazing discussed here behaves differently than the ideal near infrared solar spectrum regulating window, and it shows no obvious solar control advantage in energy savings over the ordinary window, and the phase transition process has no contribution to the energy saving effect of the single VO2 glazing in the summer.
Theoretical discussions of perfect window, ideal near infrared solar spectrum regulating window and current thermochromic window
Highlights ► Perfect and ideal window models are defined to set the technical ceilings (limitation) for different window technologies. ► The energy saving potential of regulating long wave thermal radiation property of the window is greater than that of regulating the solar spectrum transmissivity. ► The regulating capacity of the current VO2 glass to solar radiation is limited, and the high solar spectrum absorptivity in the metal state leads to higher energy consumption than in semiconductor state. ► The energy saving effect of the current VO2 single glass in summer is because of low transmittance due to high absorption rather than reflection, and the phase transition process has no contribution to its energy saving effect.
Abstract In order to evaluate the energy saving performance of various windows on a common basis, three conceptual window models are presented, and an energy consumption index is defined as the ratio of the energy consumption of a given window to the corresponding value of the perfect window. A building energy analysis program, “BuildingEnergy”, was used to evaluate the energy consumption value of different window models. The following results are obtained: the energy saving potential of regulating the emissivity of the window is greater than that of regulating the solar transmissivity, the optimized phase transition temperature of the ideal near infrared solar spectrum regulating window is between 16 and 21°C, and due to the high absorptivity in the metal state, the single vanadium dioxide (VO2) glazing discussed here behaves differently than the ideal near infrared solar spectrum regulating window, and it shows no obvious solar control advantage in energy savings over the ordinary window, and the phase transition process has no contribution to the energy saving effect of the single VO2 glazing in the summer.
Theoretical discussions of perfect window, ideal near infrared solar spectrum regulating window and current thermochromic window
Ye, Hong (author) / Meng, Xianchun (author) / Xu, Bin (author)
Energy and Buildings ; 49 ; 164-172
2012-02-03
9 pages
Article (Journal)
Electronic Resource
English
THERMOCHROMIC INTELLIGENT WINDOW WITH ADJUSTABLE EMISSIVITY
| European Patent Office | 2021
Thermochromic intelligent window with adjustable emissivity
| European Patent Office | 2023
Window door glass sash windowsill solar window cell window solar cell window
| European Patent Office | 2024