Heat/absorber exchanger, polymer film

Figure 3. BNL absorber/heat exchanger incorporating a polymer film and foil laminate.

Polymer film back surface (oriented PET) Laminate Absorber/heat exchanger (FEP) Optical selective coating (treated nickel foil)... 

The major key to low cost Is a solar collector design which has low material Intensity and Is capable of being produced at very high speed to reduce labor Intensity. The low material Intensity results from the use of polymer films and film laminates. The development of an efficient non-pressurlzed thin film absorb-er/heat exchanger also contributes to minimum material requirements. The use of a simple roll-formed sheet metal frame with a cost one third that of a conventional extruded frame further reduces the cost and can be produced as one piece to be bent around the Insulating substrate. The weather seals are Integrated Into the fllm/adheslve attachment for simplicity, reliability and very low additional material requirements. 

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