Patent Publication Number: US-2017363359-A1

Title: Finless-type dual-pipe heat exchange apparatus

Description:
TECHNICAL FIELD 
     The present invention relates to a finless-type dual-pipe heat exchange apparatus, and more particularly, to a finless-type dual-pipe heat exchange apparatus that performs dual heat exchange in inner and outer pipes as heat exchange pipes, thereby increasing a heat transfer area and achieving a high heat exchange rate. 
     BACKGROUND ART 
     Recently, in line with drastic increase in energy consumption due to rapid economic growth and improved living standards, a high-efficiency heat exchanger has been proposed. For this, it is preferable for a heat exchanger to have an increased heat transfer area in which heat absorption per unit volume is performed so that heat exchange is performed through heat transfer. However, a structure for forming an exhaust gas flow path is configured such that heat exchange is performed on only one surface, i.e., an outer side surface or an inner side surface, of a heat exchange pipe, and thus sufficient heat exchange cannot be performed. 
     That is, heat transfer in contact with a combustion gas in a unit heat exchange pipe is performed only on one surface of outer and inner side surfaces of the unit heat exchange pipe, and thus a sufficient heat transfer area cannot be obtained. 
     DISCLOSURE 
     Technical Problem 
     The present invention has been made in view of the conventional problems, and it is one object of the present invention to provide a finless-type dual-pipe heat exchange apparatus including heat exchange pipes formed as a finless dual pipe, configured such that a fluid as a heat transfer medium flows between outer and inner pipes, and thus flames generated by a burner first heat the inner pipes as heat exchange pipes formed as a finless dual pipe to thereby perform primary heat transfer, and a high-temperature combustion gas is discharged via an exhaust gas flow path formed in the finless dual-pipe-type inner pipes and the discharged exhaust gas flows into a secondary heat exchange space formed in a hot water tank surrounding the heat exchange apparatus to thereby perform secondary heat transfer with the outer pipes of the heat exchange apparatus, thereby increasing a heat transfer area and a heat exchange rate. In addition, to increase a heat exchange rate, the heat exchange apparatus is configured such that an exhaust gas flow path is formed in a chamber first heated by flames generated by the burner, of chambers, opposite side surfaces of which are connected to the inner and outer pipes, to penetrate the chamber, so that an exhaust gas flows into the second heat exchange space formed inside the hot water tank, and thus meets with the exhaust gas introduced via the exhaust gas flow path of the inner pipe, thereby uniformly transferring heat to the secondary heat exchange space formed in the hot water tank and, as a result, heat exchange is performed with high efficiency. 
     Technical Solution 
     In accordance with one aspect of the present invention, provided is a heat exchange apparatus in which a plurality of dual-pipe outer pipes  121  is attached to first and second chambers  123  and  124  having a cylindrical or box shape to penetrate inner side surfaces thereof. 
     In addition, a plurality of dual-pipe inner pipes  122  is attached to penetrate outer side surfaces of the first and second chambers  123  and  124  by penetrating the dual-pipe outer pipes  121 , thereby forming a heat transfer medium flow path  125  between the outer and inner pipes  121  and  122  so that a fluid, which is a heat transfer medium, flows into the first and second chambers  123  and  124 . 
     In addition, inner side surfaces of the inner pipes  122  are formed as an exhaust gas flow path  126 , and thus flames generated by the burner  110  are discharged along the dual-pipe-type inner pipes  122  as heat exchange pipes, thereby performing primary heat exchange. 
     In addition, a high-temperature combustion gas is discharged via the exhaust gas flow path  126  formed in the dual-pipe inner pipes  122  and introduced into a secondary heat exchange space  150  formed inside a hot water tank  130  to heat the outer pipes  121 , thereby performing secondary heat exchange, whereby a heat transfer area may be increased. In addition, to increase a heat exchange rate, of the first and second chambers  123  and  124 , opposite side surfaces of which are connected to the inner and outer pipes  122  and  121 , the first chamber  123  first heated by flames generated by a burner is provided with an exhaust gas conduit  126   a  to penetrate the first chamber  123 , through which an exhaust gas flows into the secondary heat exchange space  150  formed in the heat water tank  130  to meet with the exhaust gas discharged from the inner pipes  122  so as to perform secondary heat exchange by heating the outer pipes  121 , thereby uniformly transferring high heat to the secondary heat exchange space formed in the hot water tank. 
     The heat exchange pipes are formed as a dual pipe such that the inner pipes  122  are positioned to penetrate the outer pipes  121 , thereby forming the heat transfer medium flow path  125  between the outer and inner pipes. 
     At this time, the first and second chambers  123  and  124  having a cylindrical or rectangular box shape are connected to both ends of the pipes. When the chambers and the heat exchange pipes are connected to each other, the dual-pipe-type inner pipes  122  are penetratively connected to inner side surfaces of the chambers, and the dual-pipe-type outer pipes  121  are penetratively installed at opposite side surfaces of end sides of the chambers, thereby forming the heat transfer medium flow path  125  between the outer and inner pipes  121  and  122 , and barriers  129  are formed in the first and second chambers  123  and  124  to allow a fluid as a heat transfer medium to flow between the first and second chambers  123  and  124 . 
     In addition, the exhaust gas flow path  126  is formed in inner side surfaces of the dual-pipe-type inner pipes installed to penetrate the both ends of the chambers  123  and  124  installed on the both ends of the pipes, so that the exhaust gas is discharged through the chambers installed at both sides of the heat exchange pipes. 
     In addition, any one of the first and second chambers  123  and  124  is provided with a supply pipe  127  protruding from an outer side surface thereof to connect pipes for supplying and discharging a heat transfer medium, and a barrier  129  is positioned between the supply pipe  127  and a discharge pipe  128  in the first and second chambers  123  and  124  to divide the internal space thereof into a supply pipe side compartment and a discharge pipe side compartment. 
     In addition, in the finless-type dual-pipe heat exchange apparatus, flames generated by the burner  110  first heat dual-pipe-type inner pipes  122 , as heat exchange pipes, thereby performing primary heat exchange, and a high-temperature combustion gas is discharged via the exhaust gas flow path  126  formed in the dual-pipe-type inner pipes  122  and introduced into the secondary heat exchange space  150  formed in the hot water tank  130  to heat the outer pipes  121 , thereby performing secondary heat exchange, whereby a heat transfer area may be increased. In addition, to increase a heat exchange rate, of the first and second chambers  123  and  124 , opposite side surfaces of which are connected to the inner and outer pipes, the first chamber  123  first heated by flames generated by the burner is provided with an exhaust gas conduit  126   a  penetrating the first chamber  123  to allow the exhaust gas to flow into the secondary heat exchange space  150  formed in the hot water tank  130  to meet with the exhaust gas discharged from the inner pipes  122  so as to perform secondary heat exchange by heating the outer pipes  121 , thereby uniformly transferring high heat to the secondary heat exchange space formed in the hot water tank. 
     Advantageous Effects 
     As is apparent from the fore-going description, the present invention advantageously provides a finless-type dual-pipe heat exchange apparatus including heat exchange pipes formed as a dual pipe, in which dual heat transfer is performed through a fluid, which is a heat transfer medium, thereby increasing a heat transfer area and a heat exchange rate. 
     In addition, the increased heat exchange rate as described above may significantly contribute to energy saving. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a state diagram illustrating heat flow generated by a burner in a state in which a finless-type dual-pipe heat exchange apparatus according to an embodiment of the present invention is installed. 
         FIG. 2  is a state diagram illustrating heat medium (hot water) flow in a state in which a finless-type dual-pipe heat exchange apparatus according to an embodiment of the present invention is installed. 
         FIG. 3  is a front cross-sectional view of the finless-type dual-pipe heat exchange apparatus. 
         FIG. 4  is a front view of the finless-type dual-pipe heat exchange apparatus. 
         FIG. 5  is a front cross-sectional view of a heat water tank. 
         FIG. 6  illustrates a plan view and a cross-sectional view of a structure of the finless-type dual-pipe heat exchange apparatus according to the present invention in which sides of chambers to which supply and discharge pipes are attached and sides to which a dual pipe is attached. 
         FIG. 7  illustrates a plan view and a cross-sectional view of a structure of the finless-type dual-pipe heat exchange apparatus according to the present invention in which a dual pipe is attached to sides of chambers, opposite to the sides of chambers to which supply and discharge pipes are attached. 
     
    
    
     DESCRIPTION OF REFERENCE NUMERALS FOR MAIN ELEMENTS OF THE DRAWINGS 
     
         
         
           
               110 : burner  120 : heat exchange apparatus  121 : outer heat exchange pipe 
               122 : inner heat exchange pipe  123 : chamber to which heat transfer medium supply and discharge pipes are attached 
               124 : chamber  125 : heat transfer medium flow conduit  126 : exhaust gas flow path 
               127 : heat transfer medium supply pipe  128 : heat transfer medium discharge pipe  129 : barrier 
               130 : hot water tank  131 : hot water chamber 
               132 : heat exchange apparatus and hot water tank connection pipe 
               133 : hot water tank discharge connection hole 
               134 : gas duct  140 : chamber heat transfer medium compartment 
               150 : exhaust gas chamber between heat exchanger and hot water tank 
           
         
       
    
     BEST MODE 
     Hereinafter, a finless-type dual-pipe heat exchange apparatus according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings. 
     The finless-type dual-pipe heat exchange apparatus according to the present invention has the following structure including: 
     first and second chambers  123  and  124  positioned on opposite sides; 
     a plurality of outer pipes  121 , opposite sides of each of which are penetratively coupled to an inner surface  123   a  of the first chamber  123  and an inner surface  124   a  of the second chamber  124 , respectively, to connect the first and second chambers  123  and  124  so as to allow a fluid to flow therebetween; 
     a plurality of inner pipes  122  penetrating insides of the outer pipes  121 , opposite sides of each of which are penetratively coupled to an outer surface  123   b  of the first chamber  123  and an outer surface  124   b  of the second chamber  124 , respectively; 
     a hot water tank  130  to accommodate the second chamber  124  and the outer pipes  121 ; 
     supply and discharge pipes  127  and  128  provided in the first chamber  123  to respectively supply and discharge a heat transfer medium; 
     a barrier  129  to separate an internal space of the first chamber  123  into a side of the heat transfer medium supply pipe  127  and a side of the discharge pipe  128 ; and 
     a burner  110  provided at an outer surface side of the first chamber  123  to supply a heat source. 
     The heat source of the burner  110  heats the inner pipes  122  while passing through an exhaust gas flow path  126  of the inner pipes  122 , and then heats the outer pipes  121  while moving towards a gas duct  134  of the hot water tank  130  and passing through outer surfaces of the outer pipes  121 . 
     While the heat transfer medium introduced into the heat transfer medium supply pipe  127  passes through the heat transfer medium flow path  125  connected to the supply pipe side of the first chamber  123 , primary heat exchange is performed, and secondary heat exchange is performed while the heat transfer medium passes through the heat transfer medium flow path  125  connected to the discharge pipe side, through the first chamber  124 . 
     The first chamber  123  is provided with n barriers  129 , and the second chamber  124  is provided with n−1 barriers  129 , and thus secondary heat transfer is performed while the heat transfer medium introduced into the heat transfer medium supply pipe  127  reciprocates between the first chamber  123  and the second chamber  124   n  times. 
     The hot water tank  130  includes a hot water chamber  131  connected to the first chamber  132  via a connection pipe  132  to receive and store the heat transfer medium, and a discharge connection hole  133  to discharge the heat transfer medium to the outside. 
     The first chamber  123  is provided with an exhaust gas conduit  126   a  penetrating inner and outer surfaces thereof, through which the heat source of the burner  110  is introduced into an inner second heat exchange space  150  of the hot water tank  130  to heat the outer pipes  121  while moving towards the gas duct  134  and passing through the outer surfaces of the outer pipes  121 . 
     As illustrated in  FIG. 1 , in a finless-type dual-pipe heat exchange apparatus  120  according to an embodiment of the present invention, heat exchange pipes  121  and  122  are formed as a finless dual-pipe, and thus flames generated by the burner  110  first heat the dual-pipe-type inner pipes  122 , thereby performing primary heat exchange. In addition, a high-temperature combustion gas is discharged via the exhaust gas flow path  126  formed in the inner pipes  122  and introduced into the secondary heat exchange space  150  formed in the hot water tank  130  to heat the outer pipes  121 , thereby performing secondary heat exchange. In addition, of the first and second chambers  123  and  124 , opposite side surfaces of which are connected to the inner pipes and the outer pipes, the first chamber  123  first heated by flames generated by the burner  110  is provided with the exhaust gas flow path  126  penetrating the first chamber  123  to allow the exhaust gas to flow into the secondary heat exchange space  150  formed in the hot water tank  130  and meets with the exhaust gas discharged from the inner pipes  122  so as to perform secondary heat exchange by heating the outer pipes  121 , thereby uniformly transferring high heat to the secondary heat exchange space formed in the hot water tank. 
     In addition, as illustrated in  FIG. 2 , the heat transfer medium flow path  125  is formed between the outer pipes  121  and the inner pipes  122  to allow the heat transfer medium (hot water)  140  to flow into the chambers  123  and  124  from the chambers  123  and  124  and allow the heated heat transfer medium (hot water)  140  to flow into the hot water tank  130 , so that the hot water in the hot water tank  130  is maintained at an appropriate temperature by heat inside the secondary heat exchange space  150  formed between heat exchange apparatuses  120  in a side surface of the hot water tank  130 . 
     That is, in the heat exchange apparatus  120  of the present invention, the heat exchange pipes  121  and  122 , constituting a heat exchange part, are arranged as a finless dual pipe so as to flow the heat transfer medium (hot water)  140  between the outer and inner pipes  121  and  122 , and the first and second chambers  123  and  124  are positioned at both ends of the pipes to supply and discharge the heat transfer medium  140 . 
     At this time, as can be seen from  FIGS. 3, 4, 6, and 7 , the finless-type dual-pipe heat exchange apparatus  120  includes the first and second chambers  123  and  124  constituting a body part of the heat exchange apparatus and attached to opposite side surfaces thereof and a plurality of dual-pipe-type heat exchange pipes  121  and  122  connected to the first and second chambers  123  and  124 . 
     In addition, to flow a fluid as the heat transfer medium  140  between the inner and outer pipes  122  and  121  in the first and second chambers  123  and  124 , the outer pipes  121  are attached to the first and second chambers  123  and  124  to penetrate inner side surfaces thereof in a direction in which the pipes are attached, and the inner pipes  122  are attached to the first and second chambers  123  and  124  to penetrate outer side surfaces thereof in a direction in which the pipes are attached, thereby forming the fluid conduit  125  so as to allow the fluid  140  inside the first and second chambers  123  and  124  to flow between the first chamber  123  and the second chamber  124 . 
     In addition, by forming such configuration, the exhaust gas flow path  126  is formed in inner side surfaces of the inner pipes  122 , and thus the exhaust gas passes through the first and second chambers  123  and  124  installed on opposite sides of the heat exchange pipes  121  and  122  to be discharged therefrom. 
     In addition, to increase a heat exchange rate, of the first and second chambers  123  and  124 , opposite side surfaces of which are connected to the inner and outer pipes  122  and  121 , the first chamber  123  first heated by flames generated by the burner  110  is provided with the exhaust gas conduit  126   a  to penetrate the first chamber  123 , through which the exhaust gas of the burner  110  is directly sent to the secondary heat exchange space  150  formed in the hot water tank  130  and is brought into contact with the exhaust gas introduced via the exhaust gas flow path  126  of the inner pipes  122 , thereby uniformly transferring heat to the secondary heat exchange space  150  formed in the hot water tank  130 . 
     Thus, the finless-type dual-pipe heat exchange apparatus  120  of the present invention performs dual heat exchange using flames and the exhaust gas for high heat generated from the burner  110 , whereby a heat transfer area and a heat exchange rate may be increased. 
     While particular embodiments of the present invention have been described, it will be understood by one of ordinary skill in the art to which the present invention pertains that the spirit and scope of the present invention are not limited by these particular embodiments, and various changes and modifications may be made without departing from the essence of the present invention.