Abstract: A device which is used to cool fermentation tanks and which can be used essentially in beer production, cooling and maturation, includes a vertical heat exchanger, which comprises single- or double-wall concentric cylinders and is positioned internally at the center of a tank. The length and capacity of the cylinders differ depending on the size and shape of the tank. A coolant flows through the cylinders in order to cool and to maintain a suitable temperature range. In addition, the double-wall cylinders which form the heat exchanger are interconnected by means of coolant flow and support tubes. Meanwhile, the exchanger is supported by the cone and the walls of the tank by means of tubes which are used for the passage of the coolant and the passage of signals. Moreover, the outer wall and the cone can be provided with a cooling jacket.