Efficient vacuum tube collector, air drying performance Y=267m2 ℃/KW; average heat loss coefficient ULT=0.46W/(m2. ℃ C); 
The radiation level of the sun in the shade is H=3.2MJ/m2 
The inner liner of the box is made of SUS304 food grade stainless steel, and the outer shell is made of SUS304 or 201 stainless steel, aluminum alloy or galvanized iron plate 
The insulation layer adopts 35-80mm high-density polyester foam insulation, 
The straight through is made of 304 pipe fittings; The bracket is made of stainless steel square tube.