Tube assembly for tubular heat exchanger, and tubular heat exchanger comprising same

A tube assembly for a tubular heat exchanger, comprising:

• a tube having a flat shape to allow a combustion gas generated in a combustion chamber to flow along an inside thereof and to exchange heat between the combustion gas and a heat transfer medium flowing there outside;
• and
• a turbulator combined with the inside of the tube and configured to induce turbulence to be generated in a flow of the combustion gas,
• wherein the turbulator comprises:
• an upper turbulator combined with an upper inside of the tube adjacent to the combustion chamber to come into surface contact with the tube to increase heat conductivity and induce turbulence to be generated in a flow of the combustion gas;
• and
• a lower turbulator combined with the inside of the tube below the upper turbulator to induce turbulence to be generated in a flow of the combustion gas;
• wherein the upper turbulator comprises a first part comprising a first tube contact surface having a shape corresponding to one side part of the tube and coming into surface contact with an inner surface of the one side part of the tube and comprises a second part comprising a second tube contact surface having a shape corresponding to the other side part of the tube and coming into surface contact with an inner surface of the other side part of the tube;
• wherein the upper turbulator comprises a first pressure support portion formed by bending a part of a first cut portion cut from the first tube contact surface and protruding toward the second tube contact surface and comprises a second pressure support portion formed by bending a part of a second cut portion cut from the second tube contact surface and protruding toward the first tube contact surface, and
• wherein a protruding end of the first pressure support portion comes into contact with the second tube contact surface, and a protruding end of the second pressure support portion passes through the first cut portion and comes into contact with an inner surface of the tube.