... silicon gel6 Heat pipe: copper, thickness 1mm7 Absorptivity93% Emissivity7%8 Absorber: aluminium fin ,thickness 2mm9 Manifold: copper 1mm10 Collector Enclosure: aluminium ... , non pressure solar collector, pressure solar collector, heat pipe solar collector, flat-plate solar collector, solar energy products, solar products Copper pipe pressurized solar collector features:1 ...