ENERGETIC AND EXERGETIC RESEARCH OF HEAT EXCHANGERS LIKE RADIATORS FOR MOTOR VEHICLES

Abstract

The constructive unit pipe-fin, which is found in any radiator for motor vehicles, can be considered the basic unit from the radiator assembly, and different variants can be obtained by different coupling in accordance with the circulation of both heat carriers. We resort to an exergetic analyze of the process, that offers a realistic view on phenomena, creating the possibility to localize the sources of loses. The work attempts to calculate the heat flow rate, the output of heat carriers’ temperatures both, the thermal efficiency and the exergetic efficiency for two variants of radiators composed by “n” units and having different variants of connections: parallel or alternate tube disposition. In the case of the parallel disposition of tubes, on considers a parallel coupling from the water circulation and series coupling from the air circulation, but if pipes are alternate ranged, the coupling is parallel from the water circulation and parallel-series from the air circulation.