Nano-Tungsten Oxide Coating for Smart Sunroom

Smart Home makes our home life more comfortable, safer and more convenient! It is also energy-saving and environmentally friendly, and it also makes our life quite artistic. The smart sunroom is one of which. The basic characteristic of the smart sunroom is to permit abundant sunlight in. Thus a large area of glass wall has been always applied on it. What makes it smart is the temperature adjustment function, which keeps the room from too warm or too cold. What conflicts is that the major source of heat comes from the sunlight through the glass, wherein the ultraviolet (UV) rays and infrared radiation carries the most percent of heat. Therefore it is necessary to find a heat-insulating coating with ultraviolet sunlight & infrared radiation blocking functions for the glass wall. The nanometer tungsten oxide is considered as a suitable material.

Some researchers conducted experiments on the near-infrared rejection rate and ultraviolet radiation blocking rate of glass coated with nano-tungsten oxide, Low-e glass, glass with heat-insulating film, hollow tempered glass and single-sided glass. Here’s what they had found:

1. The glass of the tungsten oxide coating: the infrared blocking ratio of 91%; the UV blocking rate is 91%.

2. Low-e glass: the infrared blocking rate is 62.8%; the UV blocking rate is 56%.

3. The glass with heat-insulating film: the infrared blocking rate of 59%; the UV blocking rate is 99.7%.

4. Hollow tempered glass: the infrared blocking rate is 34.2%; the UV blocking rate is 23.5%.

5. Single-sided glass: the infrared blocking rate is 12.4%; the UV blocking rate is 13.5%.

It can be seen from the above data that the best effect of blocking infrared rays is single-sided glass with nano-tungsten oxide coating; while the effect of blocking UV rays is single-sided glass with heat-insulating film and with nano-tungsten oxide. However, according to industry insiders, because ultraviolet light has a bactericidal function, and normal people need to take photos of the sun, it is not healthy to have a high UV blocking rate. It is well known that solar radiation provides an energy supply for every life activity on Earth. However, although infrared rays and ultraviolet rays in sunlight are good for the human body, everything is about the amount. Generally, the permeability ratio is about 10%, which is the most scientific. Therefore, from the perspective of energy saving and health, the use of nano-tungsten oxide coated insulating glass is the best.

That is to say, nano-tungsten oxide coating has two requirements that need to be achieved urgently for building energy-saving glass:

1. High transparency means high visible light transmittance and meets lighting requirements;

2. High blocking rate in the near-infrared band, which blocks the radiant energy of the sun and meets the requirements for reducing energy consumption.

Moreover, as an environmentally friendly water-based heat-insulating material, the nano-tungsten oxide coating transparent heat-insulating material can be coated with a thickness of a few micrometers to achieve the function of temperature adjustment. In addition, this kind of insulation material has excellent safety (if this kind of glass is broken, it will not drop a lot of glass slag), anti-aging, privacy protection, stain resistance, self-cleaning, anti-glare, anti-radiation and other functions. . Insulation materials of this type are also tungsten bronze, ITO, ATO, FTO and the like. Such transparent insulation materials will inevitably receive more and more attention.

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