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The Physical Properties of Argon

Argon is a colorless, odorless, and non-toxic gas; it has the characteristics of UV stability and does not affect visible light transmission; the air content is 1%, which is the most economical inert gas; the air density: 1.7836 kg/m3, T=0°C (at the same temperature, the density of air is 1.2928 kg/m3).

The Thermal Performance of Argon

Because the density of argon is higher than that of ordinary air, the insulating glass filled with argon can slow down the heat convection in the insulating glass, thereby reducing the thermal conductivity of the gas. Thereby, the time of non-condensing and frosting of the insulating glass is extended, the glass is drier, and the energy-saving effect is very good.

Argan gas filling 1

Argan gas filling 1

(1) The K value is the best at 16mm (inflection point). From 6-16mm, the K value improves with the increase of the air layer. The heat transfer coefficient does not change beyond this inflection point, only the amount of material used is increased. Therefore, by adjusting the space distance, It can improve energy saving (6-16mm), or save material (>16mm). 

(2) The combined use of gas-filled and low-E glass can improve the energy-saving ratio and has a better effect with gas-filled transparent insulating glass. The former can be as high as 15%, while the latter is only 2-5%.

The relationship between the concentration of argon and the improvement of the heat 

transfer coefficient of insulating glass

Hollow glass is 4+12+4mm, and the three curves respectively represent the air-filled transparent glass hollow  air-filled Low-E hollow glass 1, and the air-filled Low-E hollow glass 2 (the two have different e values), and the gas concentration is 90%.

(1) There is a linear relationship between the concentration of argon and the heat transfer coefficient of insulating glass. The greater the concentration, the lower the K value;

(2) The initial charging concentration should be as high as possible, but it does not mean that the higher the better, such as 100% compared to 90 or 95%, the improvement is not particularly obvious; from the white glass, the 100% concentration is clearer than the air (argon gas) 0%

The improvement is nearly 5%, from 90%-100%, the improvement is less than 1%; the argon concentration is from 70% to 90%, for Low-E glass, the heat transfer coefficient is increased by nearly 12%. <1%; 

(3) In theory, the concentration of 100% inert gas is always better than the concentration of 90%, or even better than 95%, but in time, it is very difficult to reach the concentration of 100%, let alone In terms of time-consuming, from the point of view of the degree of improvement in the heat transfer coefficient it brings, it is very small compared to the increase from 70% to 90%. Therefore, it is not necessary to pursue an initial concentration of 100% in practice, as long as it reaches 90%.

Besides, it should be emphasized that the inflation of insulating glass can only improve the insulation of the insulating glass, that is, the heat transfer coefficient, but has nothing to do with improving the insulating ability of the insulating glass.

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