Abstract: The invention relates to a cooling element to be used as a heat sink for an electronic device (1, 11, 21, 31), as a microprocessor, which contains a base member (2, 12, 22, 32) attached in one side to the electronic device (1, 11, 21, 31) and in other side providing separate members for distribution (3, 17, 23, 33) of heat and for supporting a fan (6, 15, 25, 35) installed in a cavity in the middle of members for distribution (3, 17, 23, 33) and creating airflow for heat transfer. According to the invention at least one fin member (4, 18, 28, 38) is installed in space between of two adjacent distribution members (3, 17, 23, 33).

Abstract: A heat exchanger includes at least two ducts for separating a first heat exchange fluid, inside the ducts, from a second heat exchange fluid, outside the ducts, the ducts having longitudinal axes that are substantially parallel to one another. A substantially planar cooling element is formed with apertures through which the ducts extend. The cooling element is inclined at a first predetermined acute angle to the longitudinal axes of the ducts. The cooling element is provided with louvers that are inclined at a second predetermined acute angle to the general plane of the cooling element. The first and second predetermined acute angles are substantially equal in magnitude.

Abstract: The invention relates to a cooling element provided with louvers to be used in a heat exchanger under the influence of passing cooling medium used for cooling another medium flowing inside a circulating element whereto the cooling element is bounded by a contact area on one edge, and the louvers form an angle with the surface of the cooling element. According to the invention the cooling element is positioned so that the cooling element forms a substantially equal angle to the longitudinal direction of the circulating element as the louvers form to the surface of the cooling element.

Abstract: A heat exchanger includes at least two ducts for separating a first heat exchange fluid, inside the ducts, from a second heat exchange fluid, outside the ducts, the ducts having longitudinal axes that are substantially parallel to one another. A substantially planar cooling element is formed with apertures through which the ducts extend. The cooling element is inclined at a first predetermined acute angle to the longitudinal axes of the ducts. The cooling element is provided with louvers that are inclined at a second predetermined acute angle to the general plane of the cooling element. The first and second predetermined acute angles are substantially equal in magnitude.

Abstract: The invention relates to a heat exchanger unit to be used in a gas-fired water heater in which heater a heat exchanger unit contains tubes with fins. According to the invention the heat exchanger unit contains flat oval tubes (1,21,31) having a fin (3,22,32) at least on one flat part (4,24,33). The flat oval tubes (1,21,31) as well as the fins (3,22,32) are made of copper, copper-based alloy, aluminium or aluminium-based alloy.

Abstract: The invention relates to a heat exchanger unit to be used in a gas-fired water heater in which heater a heat exchanger unit contains tubes with fins. According to the invention the heat exchanger unit contains flat oval tubes (1, 21, 31) having a fin (3, 22, 32) at least on one flat part (4, 24, 33). The flat oval tubes (1, 21, 31) as well as the fins (3, 22, 32) are made of copper, copper-based alloy, aluminium or aluminium-based alloy.