Heat Transfer 2 deals with radiation, heat exchangers and flat plate solar collectors. It presents the treatment of radiation in semi-transparent media to be taken into account for insulation or recovery of high temperature waste heat (energy saving in industry), as well as in certain solar applications (energy transition). The numerous solved exercises allow the reader to grasp the whole range of applications, whether in the field of building, transport, materials or the environment. The appendices contain all the data needed to solve the exercises and will be a valuable source of information.