What kind of solar collector
The State Administration of Quality Supervision Inspection and quarantine and the National Standardization Management Committee in May 25, 2005 jointly issued a new national standard "all glass vacuum tube solar collector (GB/T 17049-2005)". The new standard has been carried out since November 1, 2005, to replace the old standard issued in 1997, has been implemented for 8 years (GB/T 17049-1997). Therefore, we determine the performance of the vacuum tube, only to the new national standard as the basis. Compared with the old and new standards, the main technical content changes:Improving the performance of vacuum heat collecting tube and its materialThe technical specification of the vacuum heat collecting tube with a diameter of 58mm is introducedThe vacuum quality detection of vacuum collector tubes is increased- increase the mechanical impact test with steel balls
4, currently on the market the best three vacuum tube: high temperature pipe, pipe, tube, alpine. High temperature tube film than ordinary length (from the nozzle is about 1cm), the tube of high temperature resistance, anti damping performance is particularly strong, the film on the 400 DEG C high temperature air drying condition, not aging, do not fall off, do not change color. High efficiency pipe coating from the nozzle is about 2.5cm, the ultra high absorption, less heat loss, fast heating, high thermal efficiency. In both tube and efficient management of high thermal efficiency, fast heating advantages at the same time, less heat loss, in 30 degrees under the conditions as usual out of hot water. Consumers can choose different regions according to different vacuum the heat collecting tube.5, with the naked eye, the vacuum tube inside the tube color is dark red, indicating that it is the bottom of the metal copper, the vacuum tube in the cold conditions can also work, - 30 degrees as usual out of hot waterAll glass vacuum tube solar collector (hereinafter referred to as the vacuum tube) is the current output of China solar thermal field, the most widely used, the core element of solar hot water system the most prominent energy-saving effect. Its performance, is directly related to the hot water heater. At present, the domestic brand manufacturers and many producing vacuum tube. The technical level, uneven, the price level and the poor, the propaganda is very inconsistent. So, how to judge the performance of vacuum tube?
Specific varieties are difficult to explain the identification methodThe appearance of high quality vacuum heat collecting tube:1, vacuum collector surface smooth, clean, no spots, no gas line, no scratch, no film phenomenon (this phenomenon will affect the efficiency and appearance of heat collection)2, vacuum tube film color to blue, black, black. The overall color difference is small but does not indicate that the vacuum tube of good quality, because some manufacturers to cover up the noise, often the film made of pure black. In fact, the vacuum tube in color errors can not be avoided, does not affect the heat collecting efficiency of the vacuum tube.3, vacuum heat collection tube to eliminate the mirror complete, bright and clean, no black, black hair phenomenon
1 solar transmittanceThe provisions of the new national standard in the transmission of glass tube material than tau = 0.89 (AM1.5). This is based on the physical and chemical properties called "borosilicate glass 3.3" a borosilicate glass material.The average heat borosilicate glass 3.3 "expansion coefficient (20 to 300 DEG C) = (3.3 + 0.1) * 10-6K-1. we used to call it" borosilicate glass 3.3 "." borosilicate glass 3.3 "made of glass tube, the solar transmittance tau = 0.89 (AM1.5)." AM1.5 "is the air quality is 1.5.All the production of vacuum tube manufacturers, will say their own raw materials using "borosilicate glass 3.3". However, if the production of glass vacuum tube is not "borosilicate glass 3.3", or it contains too much other elements (such as iron), glass color will be with other colors (such as green). This kind of glass vacuum tube materials produced, solar transmittance will be significantly lower than 0.89 (AM1.5), which have a serious impact on the thermal performance of the collector.
