50*1800mm Evacuated Tubes for Solar Water Heater

Product DescriptionThe evacuated tubes consists of two concentric glass tubes which are sealed in a semi-circular shape on one side and are joined to one another on the other side. The space between the tubes is evacuated and hermetically sealed (evacuated insulation). To use solar energy, the internal glass tube is coated with an environmentally friendly, highly selective layer on the outside, thus turning it into an absorber. The selective coating is protected in the evacuated space. The aluminum nitride sputter coating used is characterized by an extremely low emission and a high absorption rate.Product ProcessProduct ParametersTube StructureAll-glass double deck co-axial structureGlass material Borosilicate 3.3 glassOuter tube diameter and glass thicknessΦ58+/-0.7mm; glass thickness 1.6+/-0.15mmInner tube diameter and glass thickness Φ47+/-0.7mm; glass thickness 1.6+/-0.15mmTube Length1800mmAbsorber coating Coating Material Cu/SS-AIN(H)/SS-AIN(L)Sediment methodThree targets magnetron sputtering platingAbsorptivity0.93~0.96Emittance≤6.0%(80ºC+/-5ºC)Vacuum degreeP ≤5.0X10-3(Pa)Transmittance of glass tube T ≥0.89(AM1.5 ISO9806-1:1994Stagnation parameterY: 240~250 m2ºC/KWAverage heat loss ULT≤0.6 W/(m2*ºC)Hail resistanceΦ25mmPressure endure0.6 MPARemarksCover glass  tubeProtect the whole tube.The space  between  the cover glass tube and the inner glass tube is mechanically evacuated to create a vacuum environmentInner glass tubeFilled with heat transfer fluid (generally water) and directly plugged to the water storage tankSelective  absorbing  coatingAbsorbs solar  radiation and transfers  to the fluid in the inner tube.RetainerKeeps the inner tube fixed.GetterAbsorbs the residual air in the space between the cover glass tube and inner glass tube. Company ProfileSince its establishment in 2002, Shandong Longguang Tianxu Solar Energy Co., Ltd (hereinafter referred to as "Tianxu") has always engaged itself in the R&D, production, sales and service of high borosilicate glass tubes and new energy products including solar water heaters, solar vacuum tubes, solar heat collecting project, air source heat pump, photovoltaic products, etc. Tianxu has 10 sets of electric furnaces, 70 sets of solar vacuum tube production line and 3 sets of solar water heater production lines. The annual output has reached one million tons of high borosilicate glass, over 16 million solar vacuum tubes makes Tianxu the largest manufacturing base of high borosilicate glass tubes and solar vacuum tubes. In 2015, Tianxu established a joint venture company with Beijing Tsinghua Solar Co., Ltd- the solar vacuum tube technology initiator in the world. The newly established company has the world's most advanced solar vacuum tube production lines. Strategic PartnershipPackaging & ShippingOur products have been widely exported to many countries, like Vietnam, India, Mexico, Syria, Korea, Dubai, Etc. we are serving the top brands in solar water heaters for each country. Our yearly export quantity is 600 containers. Certifications     /* March 10, 2023 17:59:20 */!function(){function s(e,r){var a,o={};try{e&&e.split(",").forEach(function(e,t){e&&(a=e.match(/(.*?):(.*)$/))&&1