Need advice on this heating system, thanks guys

[Syryanyang]

I'm an engineer student and I'm trying to build such a solar heating system that it is drum with two layers, inner one is a metal (aluminium alloy I'm thinking) water container and outer layer is made of polymer, with air gap in-between. When suns come out, it radiates through the polymer and on the metal layer, heats up the water inside. The air gap severs as an insulation. Could someone with more experience give me some advice on whether this will work?
If you reckon this will work, then I will be looking for the material of the two layers
The polymer will need to be transparent, low solar radiation resistance, high heat resistance and low conductivity
The metal will have to have a shinny surface that absolves solar energy but a relatively low conductivity.
Anyone that gives me any insight would be much appreciated.

 

[Navin A S]

Yes, it is possible to build a solar heating system with two layers, an inner one made of metal and an outer one made of polymer. The air gap between the two layers serves as insulation, which helps maintain the heat generated from the sun. For the polymer layer, you will need to use a material that is transparent, has low solar radiation resistance, high heat resistance, and low conductivity. Examples of materials for this include polycarbonate, acrylic, or polyethylene terephthalate (PET).For the metal layer, you will need to use a material that has a shinny surface that absorbs solar energy, but also has relatively low conductivity. Examples of materials for this include aluminum, copper, or stainless steel.