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Solar energy is quantitatively unlimited,clean and non-polluting resource.It has a great potential for industrial and commercial usages.IEA(International Energy Agency)conducted SHC(Solar Heating & Cooling)33 project in order to use solar thermal energy for industrial processes,and thus,solar thermal collectors for the various temperature zones had been developed.The flat plate solar thermal collector is used primarily for the domestic house,which is currently the most popular with its high durability.Whereas,the evacuated tube-type solar collector is generally used in industrial facility with its high thermal performance,but it has disadvantage in low durability.