A simple solar air collector consists of an absorber material, sometimes having a selective surface, to capture radiation from the sun and transfers this thermal energy to air via conduction heat transfer.
2.
There are many definitions of thermal / heat insulation and it is commonly misinterpreted as Bulk / Mass / Batt Insulation , which is actually used to resist conduction heat transfer with certain R-values.
3.
There are a lot of definitions about Thermal / Heat Insulation and the common misinterpretation of Thermal / Heat Insulation = Bulk / Mass / Batt Insulation which is actually uses to resist Conduction Heat Transfer with certain " R-Value ".
4.
Solids with more than one atom in the smallest unit cell representing the lattice have two types of phonons, i . e ., acoustic and optical . ( Acoustic phonons are in-phase movements of atoms about their equilibrium positions, while optical phonons are out-of-phase movement of adjacent atoms in the lattice . ) Optical phonons have higher energies ( frequencies ), but make smaller contribution to conduction heat transfer, because of their smaller group velocity and occupancy.
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