1. The basics

Clearly, there is no such thing as exclusively solar thermal energy, apart from the evaluation of solar deposits. Any interaction with solar radiation is part of heat transfer, which is analyzed in the classic way, using three modes of heat exchange: conduction, convection and radiation. Before going any further into heat transfer, let's recall what temperature and heat are.

1.1 Temperature definition

All matter, at the microscopic level of atoms and molecules, is in perpetual motion; this permanent, disordered agitation is all the greater the warmer the body. Temperature is a macroscopic, statistical indicator of the degree of molecular agitation, and therefore of the body's internal energy reserves. This reserve is considerable. To put this into perspective,...

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