These thermal panels are designed in the same way as those of the market : an insulator and a glass window holds a solar collector traversed by a heat transfer fluid in between them. In this situation, the solar collector is the grid one can find at the back of a fridge. Insulation is provided by the doors of that same refrigerator. The glass is collected on double glazing windows. You will find many fridges in landfills or recycling areas, the double-glazing windows usually clutter the glassmakers.
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