Temperature of the LED guardrail tube and Countermeasures
Temperature of the LED guardrail tube and Countermeasures
In everyday conditions, LED guardrail tube daily temperature changes experienced in addition to the normal temperature changes, there are sun exposure and the associated heat generated by the greenhouse effect, that effect of temperature on the barrier control how the like? The following equation of state to do with the gas analysis and calculation. A certain amount of state general use of gas volume, temperature, pressure three parameters to describe the relationship between them has the following state equation: pV = nRT
Where n?? Gas molar volume, its three state variables: p?? Pressure (in KPa, kPa), V?? Volume, T?? Gas thermodynamic temperature (Unit K, Kelvin, equivalent to 273.15 + C temperature); R?? gas constant (R and pressure, temperature, gas species is related to conventional applications barrier tube can be considered under a fixed value).
Conventional circumstances when a fence tube well after the closure of the tube sealed good gas molar n is fixed, assuming that the volume V is constant, the temperature T changes, the resulting pressure P follow the changes, this change the relation between the state by the following mathematical formulas to express:
Where p1 is the gas pressure when the tube packaging, are usually standard atmospheric pressure 101.325kPa, T1 is the temperature when the guard rail tube package, with changes in production time, installed in the outdoor air temperature after the temperature with the T2, P2 is the gas pressure with the T2 change , simplified into: P1 = P1 * T2/T1:
If the package, the standard atmospheric pressure, air temperature 25 , then T1 = 273 +25 = 298K, p1 = 101.325KPa, temperature to 45 , T2 = 273 +45 = 318K, substituted into the formula 3 may be:
p2 = 101.325KPa 318K/298K = 108.125KPa
At this point the pressure inside the lamp is increased p2-p1 = 6.8KPa, a typical LED guardrail tube D-section 50 * 50mm, length 1 m within the surface area of about 0.17 square meters, the pressure to the inner wall of the pressure 6.8KPa 0.17 square m = 1156 N, about 118 kilograms force.
When the night temperature dropped to 17 degrees: T2 = 273 +17 = 290, through the same calculation, the gas pressure inside the tube for the 98.6KPa, compared to negative pressure generated by atmospheric pressure as 2.725KPa, produced by the reverse pressure 463.25 Newton, about 47 kg force.
We can see by the above calculation: fence tube every day, large or small force under the influence, destruction of seal structure, if the cooling time, the internal vacuum barrier will be aspirated into the tube inside the lamp, attached to the water shell ended up on the Chengxi (large cooling process is usually accompanied by rain and snow fog).
These are only done on the D50-tube analysis, the actual use of LED lighting night works even the possession of large temperature changes in the actual environment more harsh winter of northern China have -30 low temperature, the South under the outdoor sun exposure temperatures above 60 , 90 to bring the temperature inside and outside the fence tube pressure difference of about 0.3 atmospheres, which can also be understood that some barrier causes the breakdown of the Management Committee.
Until now, LED guardrail tube manufacturers rarely address the climate, without exception, are in sealing technology on innovation, not work to the point. Sin Yuen Photoelectric Technology Co., Ltd., the dynamic waterproof technology, cleverly balanced LED guardrail tube inside and outside air pressure, eliminating temperature factors brought the destruction of barrier pipe to avoid water absorption cooling low pressure, low cost, highly reliable programs, once and for all solve the troubled industry the water problem.
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