The ARETHA Operating Principles

Every year millions of cars are scraped all over the world. Not all the components deserve to go through the separation of base materials. One among these is the radiator.

The radiator is a component used to exchange thermal energy between water and air with a high efficiency, since it is designed to dissipate about double of the energy passed to the wheels. The use of antifreeze liquid dissolved in the water reduces the risk of corrosion and extends the radiator life beyond the whole car life. Moreover, the radiator can be used to exchange heat on reverse mode, from hot air to cold water.

The ARETHA panel is basically a box with well thermal insulated walls except for one, the window, made by a transparent sheet of polycarbonate. The bottom and the inner walls of ARETHA are black painted. The sun rays pass through the transparent window and are absorbed by the bottom of the box, rising the air temperature inside the box. The car radiator is placed in the middle of the box, in such a way that the radiator front side faces the box bottom while its back side, which includes the fan, faces the window. The fan, which is powered by a 12V DC power supply obtained from a scrap PC, makes the air flowing from the front of the radiator air compartment through the radiator pipes. It must be pointed out that quite entirely the electric energy used for the fan is afterwards dissipated into the air compartment, resulting in a very little energy dispersion.

The water circulates from the radiator to a well thermal insulated tank, where it maintains its temperature for all the night. In the tank it is possible to install a second radiator in order to heat water for different uses.