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Energy saving and environmental protection New material – Low-E glass


97% of the solar radiant energy is concentrated in the range of 0. 3-2. 5um, this part of the energy comes from the outside; the radiation energy of objects below 100 °C is concentrated in the long band above 2. 5um, this part of the energy mainly comes from indoors.

If we use the room window as the boundary, we hope that the outdoor radiant energy will come in winter or at high latitudes, and the indoor radiant energy should not be leaked. If the wavelength of the radiation is bounded, the boundary point between the indoor and outdoor radiant energy is at the wavelength of 2.5 μm. Therefore, choosing a room window with a certain function becomes the key.

The 3mm thick ordinary transparent glass has a transmittance of 87% for solar radiation, and the radiant energy from the outside during the day can be mostly transmitted; but at night or in the rainy weather, 89% of the heat radiation energy from indoor objects is absorbed by it. The temperature of the glass rises, and then the heat is radiated to the indoor and outdoor radiation and convection, so that the heat in the room cannot be effectively blocked from being discharged to the outside.

Low-E insulating glass has a transmittance of more than 60% for 0. 3-2. 5um solar radiation, and most of the outdoor radiant energy during the day, but at night and rainy weather, the thermal radiation from indoor objects is about More than 50% is reflected back into the room, and less than 15% of the heat radiation is absorbed by it and then lost through re-radiation and convection exchange, so it can effectively prevent indoor heat from escaping to the outside. This feature of Low-E glass allows it to control the unidirectional flow of thermal energy into the chamber.

Short-waves of sunlight pass through the window glass and illuminate the objects in the room. When these items are heated, they will be radiated again in the form of long waves. These long waves are blocked by the „Low-E“ window glass and returned to the room. In fact, the radiation through the window glass is reduced to 85%, which greatly improves the insulation performance of the window glass.

Pure high solar transmission, which can effectively maintain these energy, cannot be considered as an energy-saving material. „Low-E“ coated insulating glass is a better energy-saving lighting material. It has a high solar transmission, a very low „u“ value, and, due to the effect of the coating, the heat reflected by the „Low-E“ glass returns to the room, making the temperature near the window glass higher, and the person is near the window glass. I don’t feel too much discomfort. The building with wholesale low-e glass window glass has a relatively high indoor temperature, so that it can maintain a relatively high indoor temperature in winter without frosting, so that people in the room can feel comfortable. „Low-E“ glass also blocks a large amount of UV transmission, preventing the interior of items from fading.

Permanent link to this article: https://mujbiz.eu/2018/10/15/energy-saving-and-environmental-protection-new-material-low-e-glass/

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