What is the K value of doors and windows?
When talking about doors and windows, we can't help but talk about their "K" value. So what is the K value of doors and windows? What standard is used to define the K value of system doors and windows in our current situation? Today, let's talk about this issue together!
What is the K value of doors and windows?
The K value of doors and windows indicates the amount of heat transferred per unit area per unit time under stable heat transfer conditions, with an air temperature difference of 1K on both sides of the external doors and windows. In simple terms, the faster the "speed at which heat escapes from the outside in winter, or the speed at which heat invades the room in summer", the more electricity your air conditioner consumes. The poor performance of doors and windows and the slower the speed, the opposite is true.
Classification of K values of doors and windows
The K value of doors and windows is divided into ten levels in some literature, from 1 to 10. The lower the K value, the better the thermal insulation effect. The K value of level 10 refers to less than 1.1, and the K value of level 1 refers to greater than 5.0.
System Doors and Windows K Value Standard
Currently, there is no accurate standard for system doors and windows' K value, because of the differences between north and south doors and windows, the materials used are different, among which plastic steel doors and windows have the lowest K value, followed by aluminum-wood doors and windows, and finally aluminum alloy doors and windows. System doors and windows are currently defined by the industry as no higher than 2.5.