Build with plans from Les Moteurs Stirling- Rudy Mémin (see model 05).
Commonly the upper and bottom plate of the "box" of an LTD-Stirling are made out of metal (alumininium). The energy (absorption and radiation) is transported through the disks.
The displaced gas (air or helium) transports and distributes the accumulated heat.
Because the topside is made of transparent Perspex (PMMA) sunlight or even light from a light bulb will accumulate in the black displacer and heat up the gas directly above it. ("Greenhouse effect")
The advantages are:
Less loss of heat
The energy is absorbed directly so the engine will run immediately.
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