Abstract: In a heat exchanger with double-walled tubes, an end junction between inner tube and outer tube comprises an end plate in which there is a seat in which an end portion of the inner tube is housed. The corresponding outer tube is peripherally fixed sealingly around the opening of the seat and a deflector extends the inner wall of the outer tube inside the seat so as to define a toroidal cavity between the deflector and a side wall of the seat. The seat is closed by a bottom which is opposite to the opening of the seat and which has a passage connected sealingly to the end of the inner tube in the seat for the transit of the fluid to be cooled. A radial space is present near the said bottom between the toroidal cavity and internal cavity of the double-walled tube, and the end plate has at least one conduit which emerges inside the toroidal cavity for the inflow or outflow of the cooling fluid.

Abstract: In a heat exchanger with double-walled tubes, an end junction between inner tube and outer tube comprises an end plate in which there is a seat in which an end portion of the inner tube is housed. The corresponding outer tube is peripherally fixed sealingly around the opening of the seat and a deflector extends the inner wall of the outer tube inside the seat so as to define a toroidal cavity between the deflector and a side wall of the seat. The seat is closed by a bottom which is opposite to the opening of the seat and which has a passage connected sealingly to the end of the inner tube in the seat for the transit of the fluid to be cooled. A radial space is present near the said bottom between the toroidal cavity and internal cavity of the double-walled tube, and the end plate has at least one conduit which emerges inside the toroidal cavity for the inflow or outflow of the cooling fluid.

Abstract: A heat exchanger includes a pressurized shell and a tube bundle with exchanging tubes between flexible tubesheets. The flexible tubesheets are reciprocally interconnected by tie rods in a central zone of the flexible tubesheets which is devoid of exchanging tubes. The exchanging tubes in the tube bundle are arranged around the tie rods. The heat exchanger may further include conveying diaphragms arranged along the tube bundle. The conveying diaphragms may be shaped, alternately, as discs and rings.

Abstract: A heat exchanger with a pressurised shell and a tube bundle with exchanging tubes between flexible tubesheets has the flexible tubesheets reciprocally interconnected by tie rods in a central zone of the tubesheets which is devoid of exchanging tubes and the exchanging tubes in the tube bundle are arranged around such tie rods. The exchanger may further comprise conveying diaphragms arranged along the bundle shaped, alternately, as discs and rings.

Abstract: Supply assembly for a turbine of a solar thermodynamic system provided with plural multiple parabolic mirrors for heating a first thermal carrier fluid contained in a tank to a first temperature, comprising a column structure provided at the upper part with an exit. The column structure comprises: a lower portion provided with two inlets connected to the tank to be supplied with the first thermal carrier fluid, the lower portion comprising first and second heat exchangers supplied with a second thermal carrier fluid respectively to an overheated temperature and re-overheating temperature; an upper portion fluidically connected with the lower portion, the upper portion comprising a boiler to bring the second fluid from a pre-heating temperature to a boiling temperature, and a cylindrical body arranged on the boiler; a pre-heating and supplying structure for heating the second thermal carrier fluid to the pre-heating temperature and supply it to the column structure.

Abstract: Supply assembly for a turbine of a solar thermodynamic system provided with plural multiple parabolic mirrors for heating a first thermal carrier fluid contained in a tank to a first temperature, comprising a column structure provided at the upper part with an exit. The column structure comprises: a lower portion provided with two inlets connected to the tank to be supplied with the first thermal carrier fluid, the lower portion comprising first and second heat exchangers supplied with a second thermal carrier fluid respectively to an overheated temperature and re-overheating temperature; an upper portion fluidically connected with the lower portion, the upper portion comprising a boiler to bring the second fluid from a pre-heating temperature to a boiling temperature, and a cylindrical body arranged on the boiler; a pre-heating and supplying structure for heating the second thermal carrier fluid to the pre-heating temperature and supply it to the column structure.

Abstract: A union connection between uncooled pipe and cooled double-wall pipe in a heat exchanger comprising a double-wall pipe comprising in turn an internal pipe traveled by a fluid to be cooled and an external pipe defining with the internal pipe an air space traveled by a cooling fluid with one end of the double-wall pipe being connected to an inlet duct of the fluid to be cooled through a connection part also forming a bottom wall of the air space virtually transversal to the double-wall pipe extension and characterized in that the connection part has an annular form with U cross section to define two annular shanks extending longitudinally to the pipe with each shank being welded to one end of one of the two pipes of the double-wall pipe and in that the end of the inlet duct is welded to the connection part at said bottom wall of the air space.

Abstract: A connection between an uncooled pipe and a cooled double-wall pipe with between the walls a hollow space run through by cooling fluid let into the hollow space and taken from the hollow space through side passages connected to cooling fluid inlet and outlet ducts and including a connection zone with longitudinal cross section generally in fork form to have single tubular end connected to the uncooled pipe and an opposite double-wall tubular end to which are connected the corresponding walls of the cooled double-wall pipe so that the fork bottom constitutes a terminal closing of the hollow space and a side passage is made opposite the connection and a portion thereof nearest the uncooled pipe is almost at the height of the fork bottom. A double-pipe heat exchanger includes such a connection.

Abstract: A union connection between uncooled pipe and cooled double-wall pipe in a heat exchanger comprising a double-wall pipe comprising in turn an internal pipe traveled by a fluid to be cooled and an external pipe defining with the internal pipe an air space traveled by a cooling fluid with one end of the double-wall pipe being connected to an inlet duct of the fluid to be cooled through a connection part also forming a bottom wall of the air space virtually transversal to the double-wall pipe extension and characterized in that the connection part has an annular form with U cross section to define two annular shanks extending longitudinally to the pipe with each shank being welded to one end of one of the two pipes of the double-wall pipe and in that the end of the inlet duct is welded to the connection part at said bottom wall of the air space.

Abstract: A connection (10) between an uncooled pipe (11, 111) and a cooled double-wall pipe (12) with between the walls a hollow space (13) run through by cooling fluid let into the hollow space and taken from the hollow space through side passages (14, 114) connected to cooling fluid inlet and outlet ducts and comprising a connection zone with longitudinal cross section generally in fork form to have a single tubular end (16, 116) connected to the uncooled pipe and an opposite double-wall tubular end (117, 118) to which are connected the corresponding walls (19, 20) of the cooled double-wall pipe so that the fork bottom (21, 121) constitutes a terminal closing of the hollow space (13) and characterized in that a side passage (14, 114) is made opposite the connection and a portion thereof nearest the uncooled pipe (11, 111) is almost at the height of the fork bottom (21, 121). A double-pipe heat exchanger includes such a connection.