US 11,835,261 B2
Heat exchanger unit
Jun Kyu Park, Seoul (KR); and Duck Sik Park, Seoul (KR)
Assigned to KYUNGDONG NAVIEN CO., LTD., Gyeonggi-do (KR)
Filed by KYUNGDONG NAVIEN CO., LTD., Gyeonggi-do (KR)
Filed on Mar. 31, 2022, as Appl. No. 17/709,444.
Application 17/709,444 is a continuation of application No. 16/973,025, granted, now 11,585,572, previously published as PCT/KR2019/006543, filed on May 30, 2019.
Claims priority of application No. 10-2018-0064666 (KR), filed on Jun. 5, 2018; application No. 10-2018-0064668 (KR), filed on Jun. 5, 2018; application No. 10-2018-0064669 (KR), filed on Jun. 5, 2018; and application No. 10-2018-0156356 (KR), filed on Dec. 6, 2018.
Prior Publication US 2022/0221190 A1, Jul. 14, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. F28F 1/20 (2006.01); F24H 8/00 (2022.01); F24H 9/18 (2022.01); F28D 1/053 (2006.01); F28F 1/32 (2006.01); F28F 9/02 (2006.01); F28D 21/00 (2006.01)
CPC F24H 8/006 (2013.01) [F24H 9/18 (2013.01); F28D 1/053 (2013.01); F28F 1/32 (2013.01); F28F 9/02 (2013.01); F28D 2021/0024 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A heat exchanger unit comprising:
a sensible heat exchanger including a sensible heat exchange pipe disposed in a sensible heat exchange area and configured to receive water and allow the water to flow through the sensible heat exchange pipe, the sensible heat exchange area being configured to receive sensible heat generated by a combustion reaction and heat the water;
a latent heat exchanger including a latent heat exchange pipe disposed in a latent heat exchange area and configured to receive the water and allow the water to flow through the latent heat exchange pipe, wherein the latent heat exchange area is located downstream of the sensible heat exchange area with respect to a reference direction that is a flow direction of combustion gas generated during the combustion reaction, the latent heat exchange area being configured to receive latent heat generated during a phase change of the combustion gas and heat the water; and
a housing configured to surround the heat exchange areas to define the heat exchange areas therein,
wherein when a cross-sectional area of the heat exchange area defined on a plane perpendicular to the reference direction is referred to as a reference cross-sectional area and the most upstream side and the most downstream side of the sensible heat exchanger or the latent heat exchanger with respect to the reference direction are referred to as an inlet end and an outlet end, a section in which the reference cross-sectional area is reduced along the reference direction is formed between an outlet end of the latent heat exchange pipe and an inlet end of the latent heat exchange pipe.