Summary
Numerical model of a solar heating system in which a solar chimney's buoyancy drives air through stacked sieve beds filled with phase change capsules, treated as porous layers with thermal non-equilibrium and k-ε turbulence. Validated against published experiments, the capsule beds store heat about 7–25% longer than tuff or basalt; porosity, particle size and the flow-channel-to-bed-thickness ratio govern storage performance.
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