Provided is a heat exchanger. The heat exchanger may include a plurality first through third heat exchange pipes connected between a first side part and a second side part, each of which comprising a path of moving heat-exchanger fluid inside; first blisters formed on the outer side surfaces of the first side part and the second side part, thereby connecting gaps between each neighboring first heat exchange pipe; second blisters formed on the outer side surface of the first side part, thereby connecting the first heat exchange pipes with the second heat exchange pipes or the second heat exchange pipes with the third second heat exchange pipes; and third blisters formed on the outer side surface of the second side part, thereby connecting neighboring second heat exchange pipes or neighboring third heat exchange pipes. The second heat exchange pipes may be spaced apart from the first heat exchange pipes and formed above the first heat exchange pipes and the third heat exchange pipes may be spaced apart from the second heat exchange pipes and formed above the second heat exchange pipes.

A tube transition fitting includes a body having a scalloped end having a raised portion and a depressed portion connected by a continuously sloping transition portion. The fitting is formed having a first wall thickness and a second wall thickness. A tube seat is formed on a surface connected to the body, the surface being adjacent a transition from the first wall thickness to the second wall thickness. A tube transition assembly includes a header portion, the tube transition fitting, and a heat exchange tube, each being connected using one or more simplified and/or heat-optimized connections.

A heat exchanger includes fins and a plurality of pairs of cut-and-raised parts. Each pair of the cut-and-raised parts are positioned on both left and right sides in a width direction on a downstream side in a heating gas flowing direction around an outer circumference surface of each of upstream pipe body parts and face a downstream part on the outer circumference surface with a first gap therebetween. A width between upstream end parts of each pair of the cut-and-raised parts is larger than an outer diameter of each of the upstream pipe body parts. In addition, each pair of the cut-and-raised parts are inclined such that a width between downstream end parts becomes smaller than the width between the upstream end parts. A heating gas passing part having a width narrower than a dimension therebetween is provided in a region between two adjacent upstream pipe body parts.

The present description discloses a combustion type water heater that heats water by burning fuel. The combustion type water heater includes: a burner that generates combustion gas by burning the fuel; a heat exchanger that exchanges heat between the water passing through on an inside of the heat exchanger and the combustion gas flowing on an outside of the heat exchanger, an exhaust pipe that discharges the combustion gas after the heat exchange in the heat exchanger as exhaust gas; an exhaust gas temperature detector that detects a temperature of the exhaust gas flowing in the exhaust pipe as an exhaust gas temperature; a clog degree detector that detects a degree of clog in the exhaust pipe; and a scale buildup determiner that determines whether or not scale has built up inside the heat exchanger based on the exhaust gas temperature and the degree of clog in the exhaust pipe.

A heat exchanger includes: a partition wall that separates two fluids of different temperature; and multiple plate-shaped fins formed on at least one surface of the partition wall and each having a pair of heat transfer surfaces. The partition wall and the multiple fins are made of a same metal material to constitute an integrally molded product. The multiple fins each have a curved part and are arranged to be spaced from one another in a direction intersecting with the pair of heat transfer surfaces. Each heat transfer surface of the pair of heat transfer surfaces is formed with multiple grooves having a depth of 100 μm to 400 μm in a thickness direction of each fin.

A U-bend pipe type heat exchanger includes: a heat exchanger main body surrounded by a front side plate, a back side plate, a left side plate, and a right side plate, and having open upper and lower portions through which a heat source passes; a plurality of U-bend pipes inserted between the left side plate and the right side plate, each of the plurality of U-bend pipes including two heat exchange pipes arranged in parallel with each other and a U-shaped pipe connecting one end portions of the two heat exchange pipes; and a plurality of water jackets attached to at least one of outward surfaces of the left side plate and the right side plate, and connecting open end portions of two adjacent heat exchange pipes such that a low-temperature water circulates along the plurality of U-bend pipes.

An evaporator with integrated heat recovery incorporates a vapor tube in a combustion chamber surrounded by a water jacket. The water jacket is in fluid communication with an exhaust gas heat exchanger. Coolant circulates in series or parallel first and second coolant flows through the exhaust gas heat exchanger to recover heat from exhaust gasses leaving the combustion chamber and through the water jacket surrounding the combustion chamber to recover heat not delivered to the operating fluid. The evaporator may incorporate a condenser within the housing and in fluid communication with the exhaust gas heat exchanger and/or water jacket. The evaporator may be divided to flow in parallel through the condenser the exhaust gas heat exchanger. The water jacket may be fluidly connected with one or the other of the condenser or the exhaust gas heat exchanger.

The present invention discloses a high-temperature fluid transporting pipeline integrating a heat exchange apparatus, wherein heat contained in a high-temperature fluid can be recovered during the transportation thereof. The heat exchange apparatus comprises a hermetic heat exchange cavity, and a heat-receiving fluid coil installed therein. The method of heat exchange is that the high-temperature fluid heats an auxiliary fluid in the cavity via a heat exchange base plate of the heat exchange cavity in contact therewith, and the heated auxiliary fluid then conducts the heat to a heat-receiving fluid in the heat-receiving fluid coil. As an example, the high-temperature fluid is flue gas generated by combustion, an upper part of a flue gas transporting pipeline is replaced by the heat exchange apparatus of the present invention, the auxiliary fluid is an inert gas such as air, and the air heated indirectly by the high-temperature flue gas conducts heat to fuel and/or oxygen-enriched gas flowing in the heat-receiving fluid coil (as an oxidant/combustion aid).

A process for removing or reducing the accumulation of foulant within furnaces and heat exchangers in industrial systems such as an oil refinery by introducing a periodic steam blast. The steam blast is directed into the fluid stream from which the foulants form on to the heat exchanger surfaces. The steam blast increases the flow rates, creates turbulence and increases the temperature within the heat exchanger to dislodge foulant in both a soft and hardened states from internal surfaces upon which foulants have adhered and accumulated.

A heat exchanger includes a tube expansion portion formed by expanding a heat transfer tube so that an outer peripheral surface of the heat transfer tube is pressed against an inner peripheral surface of a hole provided in a side wall portion of a case. The tube expansion portion includes first and second bulge portions positioned respectively on the inside and the outside of the side wall portion so as to sandwich the side wall portion in an axial length direction of the heat transfer tube and configured such that respective outer peripheral surfaces thereof partially bulge outward in a radial direction of the heat transfer tube, an end portion tip end of the heat transfer tube is positioned apart from the second bulge portion, and the end portion tip end and a part in the vicinity thereof are expanded so as to be included in a part of the tube expansion portion. Thus, effects such as improving the precision with which the side wall portion of the case, the heat transfer tube, and a connecting tube are fitted to each other can be achieved, and as a result, the respective parts can be brazed easily and appropriately.