This is an innovation resulting from practical work carried out as part of the "LMD Project" supervised by Professor Haddy MBUYI KATSHIATSHIA MUKOLE. The students were asked to recycle used electrical cables. These first-year students in Engineering Sciences managed to melt and recover the copper from the cables and, using a mold, they gave the collected copper a coil shape. And the coil made it possible to produce refrigerator freshness. These students are Laetitia KATSHUVA Dunia, MUFWAR VAN WEY, EKONDO Exaucé, TUPEMUNU Honoré, VITA Edulic, and MPUTU Franck.