LOW-E GLASS AND HOW DOES IT PERFORM IN THE DAYLIGHT from dsfsdf's blog
According to some estimates, between 10 and 50% of a home's energy loss occurs through its windows and doors, with 90% of the energy lost through windows being lost through the glass itself (see Figure 1). A significant amount of energy is being wasted by a small portion of your home's structural integrity, and this is unquestionably a significant amount of energy. It wasn't until 1975 that the first low-emissivity glazing solution was introduced to the market in an attempt to remedy the situation.
In most cases, thermal energy is the primary focus of attention when describing a surface's emissivity, which is defined as the amount of energy emitted at specific wavelengths by a surface at specific temperatures. To distinguish between perfect reflectors and perfect absorbers, a material is assigned a numerical thermal emissivity value ranging from 0 to 1, with the perfect reflector having an emissivity of zero and the perfect absorber having an emissivity of one. Emissionsivity is measured in units of 0 and 1. A perfect reflector has an emissivity of 0 and a perfect absorber has an emissivity of 1.
Metals, such as silver and aluminum, have thermal emissivities of less than 0.05, whereas standard clear glass has an emissivity of approximately 0.9, making it one of the highest emissivity materials available on the market. Instead, standard glass has a thermal emissivity of 0.9, which means that it allows 90% of the thermal energy to pass through it while reflecting the remaining 10% back into space. This has led to the conclusion that window glass requires assistance in reflecting heat back into the house.
When it comes to low e insulated glass, it makes sense to use it. A micron-sized, transparent coating is applied to the surface of clear glass, which is more effective at reflecting heat than the glass itself, resulting in a composition with lower thermal conductivity than regular glass. A low-E coating on glass keeps your home warmer by reflecting a greater proportion of the heat back into your home, and it can also keep you cooler by reflecting solar thermal energy from the outside world back into your home.
The Wall