The difference between single silver, double silver and three silver Low-E glass

First, the concept of Low-E glass

Low-E glass, also known as Low Emissivity Glass, is a film-based product coated with multiple layers of metal or other compounds on the surface of the glass. The main functional layer of the Low-E film is the silver layer. Silver is one of the substances with low emissivity in nature. The nano-level silver layer is plated on the glass surface, which can reduce the radiance of the glass from 0.84 to 0.02~0.12. Thereby the sunlight is filtered into a cold light source. The coating layer has the characteristics of high transmission of visible light and high reflection of medium and far infrared rays, thereby filtering sunlight into a cold light source, which satisfies both natural lighting requirements and comfortable room temperature.

Second, the difference between single, double and triple silver Low-E glass

1. The difference between layers

A typical Low-E glass contains only one layer of pure silver (functional layer), the so-called single silver Low-E glass. The total number of layers of double silver glass is more than 9 layers, including two layers of pure silver; the three silver Low-E glass contains a total of 13 layers or more, including three layers of pure silver (Fig. 1). Compared with single silver Low-E glass, although the processing technology of double and triple silver Low-E glass is higher, its energy saving is much better than single silver Low-E glass.

2. The difference in function

Optical parameters: Under the premise of the same light transmittance, double silver, three silver Low-E has a lower shading coefficient Sc and heat transfer coefficient U (see table below), double silver, three silver Low-E glass than single silver Low-E glass blocks more solar radiant heat and filters sunlight more into a cold source.

Indoor comfort: Low-E glass can greatly reduce the heat exchange between the indoor and outdoor environment through the glass. Therefore, when the air conditioner is cooling or heating, the air conditioner can be in standby for a longer time after the indoor temperature reaches the set temperature. State, which saves power. Not only that, the sunshade characteristics of Low-E glass have greatly reduced the time required to use the curtain shades, thereby improving the indoor light comfort and creating a more transparent and bright indoor environment. To make a simple analogy, in the summer, the construction of ordinary glass originally required air conditioning and cooling for an effective running time of 100 days, and the effective cooling operation time required for single silver Low-E glass was shortened to 35 days, and if double silver was used, Or three-silver Low-E glass, which takes only about 30 days or less, further saves on electricity bills. In the long run, although the use of double and triple silver Low-E glass increases the construction cost of a small amount of projects, it greatly reduces the energy consumption during the life of the building, and the energy consumption in the later period can recover the investment in a short time. The added cost.