The thermal coefficient cannot be calculated in this case.
The heat absorption capacity of the solar system is technically called "heat gain", but it depends on factors such as ambient temperature, daily accumulated solar radiation, lighting area of the system solar and water tank. capacity of the solar system. Of course, the most important thing is the visible light transmission and absorption rate of the vacuum tube. The specific calculation will also vary greatly depending on the structure of the solar system (which is directly related to the heat transfer effect). There are many influencing factors, especially weather, which are unpredictable and direct calculation is particularly difficult. Of course, there are good calculation models established in some books, but they are not only considered as the visible light transmission parameter.
Dan the glass shading coefficient test, what is the formula for calculating the shading coefficient?
The SHGC value is not equal to the shading coefficient of the glass!
The SHGC value does not actually need to be calculated, it can be measured with an instrument, such as the LS182 from Linshang Technology.
The shading coefficient of glass is the SHGC value ÷ the total solar transmittance of standard 3mm thick glass (national standard 0.889, international standard 0.87.
>Shading The coefficient calculation formula is: shading coefficient = solar heat gain coefficient ÷ total solar transmittance of standard white glass.
You can first measure the solar heat gain coefficient (SEGC) of glass before adding solar energy of standard white glass Total transmittance (theoretical value in GB/T2680 is 0.889 and international standard is 0.87) p>
For example, if the SHGC value of this morglass value is 0.225, use 0.225. C÷0.87 (international standard) = 0.258< /p>
0.258 is the shading coefficient of this piece of glass