CONDENSATION HEAT EXCHANGER WITH A DOUBLE BUNDLE OF TUBES Russian patent published in 2008 - IPC F24H1/43 

FIELD: the invention is assigned for heating liquid and may be used for heating or/and sanitary usage.

SUBSTANCE: the heat exchanger is connected with a cylinder furnace having two parallel heat-exchanging elements. Each of these heat-exchanging elements consists of a tube or a group of tubes forming a spiral bobbin in which the wall of the tube (tubes) is manufactured out of material with good thermal conductivity and has a flattened and oval transversal section with the main axis perpendicular or approximately perpendicular to the axis of the spiral. The width on the interval separating the two adjusting turns is constant and smaller than the thickness of the transversal section. The heat-exchanging elements are firmly installed inside the gas- proof shell. The shell encircles two heat-exchanging elements of tubes, located at a distance from each of them. The heat exchanger is fulfilled so that hot gases producing in the furnace pass radially or approximately radially at first through the heat-exchanging element and than through the secondary heat-exchanging element. The diameter of the furnace is smaller then the diameter of the primary heat-exchanging element, The furnace is installed coaxially inside the primary heat-exchanging element. The length of the secondary heat-exchanging element is less then the length of the primary heat-exchanging element for forming free space opposite the end section of the primary heat-exchanging element in continuation of more short the secondary heat-exchanging element. A chamber connected with the inner space of the secondary heat-exchanging element is located in the space.

EFFECT: increases compactness of the heat-exchanger and reduces its weight.

15 cl, 10 dwg