KR20090063438A - Condensing type boiler - Google Patents

Condensing type boiler Download PDF

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Publication number
KR20090063438A
KR20090063438A KR1020070130800A KR20070130800A KR20090063438A KR 20090063438 A KR20090063438 A KR 20090063438A KR 1020070130800 A KR1020070130800 A KR 1020070130800A KR 20070130800 A KR20070130800 A KR 20070130800A KR 20090063438 A KR20090063438 A KR 20090063438A
Authority
KR
South Korea
Prior art keywords
water
tank
boiler
combustion chamber
fluid
Prior art date
Application number
KR1020070130800A
Other languages
Korean (ko)
Inventor
김영모
정병철
Original Assignee
주식회사 경동나비엔
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 경동나비엔 filed Critical 주식회사 경동나비엔
Priority to KR1020070130800A priority Critical patent/KR20090063438A/en
Publication of KR20090063438A publication Critical patent/KR20090063438A/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT GENERATING MEANS, IN GENERAL
    • F24H1/00Water heaters having heat generating means, e.g. boiler, flow- heater, water-storage heater
    • F24H1/48Water heaters for central heating incorporating heaters for domestic water
    • F24H1/52Water heaters for central heating incorporating heaters for domestic water incorporating heat exchangers for domestic water
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT GENERATING MEANS, IN GENERAL
    • F24H1/00Water heaters having heat generating means, e.g. boiler, flow- heater, water-storage heater
    • F24H1/22Water heaters other than continuous-flow or water storage heaters, e.g. water-heaters for central heating
    • F24H1/24Water heaters other than continuous-flow or water storage heaters, e.g. water-heaters for central heating with water mantle surrounding the combustion chamber or chambers
    • F24H1/26Water heaters other than continuous-flow or water storage heaters, e.g. water-heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body
    • F24H1/28Water heaters other than continuous-flow or water storage heaters, e.g. water-heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes
    • F24H1/287Water heaters other than continuous-flow or water storage heaters, e.g. water-heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes with the fire tubes arranged in line with the combustion chamber
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT GENERATING MEANS, IN GENERAL
    • F24H1/00Water heaters having heat generating means, e.g. boiler, flow- heater, water-storage heater
    • F24H1/22Water heaters other than continuous-flow or water storage heaters, e.g. water-heaters for central heating
    • F24H1/34Water heaters other than continuous-flow or water storage heaters, e.g. water-heaters for central heating with water chamber arranged adjacent to the combustion chamber or chambers, e.g. above or at side
    • F24H1/36Water heaters other than continuous-flow or water storage heaters, e.g. water-heaters for central heating with water chamber arranged adjacent to the combustion chamber or chambers, e.g. above or at side the water chamber including one or more fire tubes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT GENERATING MEANS, IN GENERAL
    • F24H8/00Fluid heaters having heat-generating means specially adapted for extracting latent heat from flue gases by means of condensation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT GENERATING MEANS, IN GENERAL
    • F24H9/00Details
    • F24H9/0005Details for water heaters
    • F24H9/001Guiding means
    • F24H9/0015Guiding means in water channels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT GENERATING MEANS, IN GENERAL
    • F24H9/00Details
    • F24H9/02Casings; Cover lids; Ornamental panels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT GENERATING MEANS, IN GENERAL
    • F24H9/00Details
    • F24H9/18Arrangement or mounting of grates, burners, or heating elements
    • F24H9/1809Arrangement or mounting of grates, burners, or heating elements for water heaters
    • F24H9/1836Arrangement or mounting of grates, burners, or heating elements for water heaters fluid combustible heating means
    • Y02B30/102

Abstract

The present invention discloses a boiler for heating and hot water. Boiler according to an embodiment of the present invention is the upper side of the combustion chamber is installed burner is installed, the boiler outer cylinder is formed with a water tank so that the fluid is built into the lower side of the combustion chamber circulating; Associations installed to penetrate the tank so as to heat the fluid circulating in the tank by using the combustion gas heated in the combustion chamber and communicating with the combustion chamber; When the fluid collected in the tank is circulated in the water tank is provided inside the tank so that the turbulence is formed as it is purified, the water-receiving plate penetrates; characterized in that it comprises a. Therefore, since the turbulence is formed by the water hammer when the heating water collected in the water tank of the boiler is circulated, the convection of the heating water becomes smoother, thereby improving the heat exchange efficiency between the heating water and the tube.

Description

Condensing Boiler {Condensing Type Boiler}

The present invention relates to a boiler for heating and hot water, and more particularly to a condensing boiler that can improve the heat exchange of the fluid by reducing turbulence is formed when the heated fluid of the boiler is moved.

In general, boilers used for heating and hot water at home are widely used as raw materials of oil and gas, and recently, liquefied natural gas (LNG) is mainly used, which is less air pollution and easy to use.

Recently, the most commonly used boilers in homes are divided into condensing boilers and non-condensing boilers according to heat exchangers for heating heating water. The condensing boiler includes a sensible heat exchanger that directly heats the heating water using combustion heat by a burner, and a latent heat exchanger that uses latent heat of condensation of exhaust gas passing through the sensible heat exchanger. That is, the condensing boiler is provided with a sensible heat exchanger and a latent heat exchanger at the same time.

A general condensing boiler as described above will be described with reference to FIG. 1.

In the conventional condensing boiler, a combustion chamber 40 and a heat exchanger 50 are installed in a boiler outer cylinder 30 in which a water tank 31 is formed therein, and high temperature combustion heat generated by combustion of fuel in the combustion chamber 40. The heat is transferred to the heating water moving in the water tank 31 through the heat exchanger 50, and the heated heating water is supplied according to a necessary purpose such as heating.

The heat exchange part 50 is composed of first and second heat exchangers 51 and 52 so as to be converted into a main heat exchanger and a latent heat exchanger of the condensing oil boiler, and the boiler outer cylinder 30 is the combustion chamber 40. ), A first grooved groove 51 (not shown) is formed in the upper portion so that the first heat exchanger 51 and the second heat exchanger 52 can be placed. In addition, the boiler outer cylinder 30, the lower portion of the circulation chamber 32 is formed, the upper surface is coupled to the noise cylinder 53 and the flue 60.

Accordingly, the fuel is combusted in the combustion chamber 40 by the downward combustion burner 41 provided above the combustion chamber 40, and the high-temperature exhaust gas generated after combustion is returned to the circulating chamber 32 and the heat exchanger ( 50), it is discharged to the outside via the noise container 53, the year (60). At this time, since the flow chamber 32 is connected to both the first and second heat exchangers 51 and 52 of the heat exchange unit 50, the exhaust gas introduced into the flow chamber 32 is the first and second. Dispersed and moved to the two heat exchangers (51, 52), it is gathered again in the noise chamber (53) and discharged through the flue (60).

In addition, by installing a hot water supply heat exchanger 90 surrounding the inner circumference of the boiler outer cylinder 30 in a coil form, and circulating the hot water supply therein, hot water can be used separately from the heating water.

In the conventional condensing boiler configured as described above, when the burner 41 is ignited in the combustion chamber 40, the combustion gas is generated by the burner 41, and the combustion gas is externally connected to the combustion chamber 40 through the pipe 50. When it is discharged directly to the heating water (fluid) is circulated in the water tank (31) is made to exchange the heating water is heated. By the way, when the heating water is always circulated in the water tank 31, the heated heating water does not smoothly convection in the water tank 31, so that the heat flow efficiency of the heating water is deteriorated.

The present invention has been made in order to solve the above-mentioned conventional problems, the turbulence is formed when the heating water collected in the water tank of the boiler is circulated to make the convection of the heating water more smoothly heat exchange with the combustion chamber and the associated The purpose is to provide a condensing boiler that can improve the efficiency.

Condensing boiler according to the present invention in order to achieve the above object is a combustion chamber in which a burner is installed on the upper side, the boiler is provided with a water tank so that the fluid is built into the lower side of the combustion chamber circulating; Associations installed to penetrate the tank so as to heat the fluid circulating in the tank by using the combustion gas heated in the combustion chamber and communicating with the combustion chamber; When the fluid collected in the tank is circulated in the tank is provided in the tank so that the turbulence is formed as the turbulence is formed;

Here, the association is preferably formed in a rectangle.

In addition, the water hammer is preferably installed so that the outer surface is spaced from 2mm to 4mm from the inner surface of the water tank, and perpendicular to the association.

In addition, it is preferable that the water circulation plate is provided with a fluid circulation pipe through which the fluid flows so that the pressure generated by the water barrier plate decreases when the fluid is circulated in the water tank.

In addition, it is preferable that a plurality of the water hammer plates are provided to have a predetermined interval.

The fluid circulation pipe preferably has a diameter of 10 mm or less.

In addition, it is preferable that one or more of the associations penetrated through the water hammer are installed so that an outer surface thereof has a predetermined distance from the water hammer.

According to the condensing boiler according to the embodiment of the present invention, since the turbulence is formed by the water hammer plate when the heating water collected in the water tank of the boiler is circulated, the convection of the heating water is made more smoothly and the heat exchange with the heating water and the tube There is an effect of improving the efficiency.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are defined in the technical spirit of the present invention on the basis of the principle that the inventor can appropriately define the concept of the term in order to explain his invention in the best way. It must be interpreted to mean meanings and concepts.

Hereinafter, a condensing boiler according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a cross-sectional view showing the structure of the condensing boiler according to an embodiment of the present invention, Figure 3 is a perspective view showing a state where a water hammer plate is installed in the water tank of the condensing boiler according to an embodiment of the present invention, Figure 4 is a present invention A perspective view showing a state in which a fluid circulation pipe is installed in the water hammer plate of the condensing boiler according to the embodiment.

2 to 4, the condensing boiler includes a base end portion 101 installed on the ground, and a boiler outer cylinder 110 installed above the base end portion 101 and having a predetermined space therein.

A combustion chamber 111 is formed above the boiler outer cylinder 110, and a burner 113 capable of burning fuel inside the combustion chamber 111 is provided inside the combustion chamber 111. On the lower side, a water tank 115 through which heating water, which is a heat exchange fluid, is collected and circulated. The inside of the water tank 115 is installed to penetrate the water tank 115 so as to heat the heating water circulated in the water tank 115 by using the combustion gas heated in the combustion chamber 111, and communicates with the combustion chamber 111. Associations 120 are provided. At this time, the association 120 is provided in communication with the combustion chamber 111, the outer surface is in contact with the heating water collected in the tank (115).

Accordingly, when combustion gas is generated in the combustion chamber 111 by the burner 113 of the combustion chamber 111, the heat of the heated combustion gas is moved into the associations 120, thereby increasing the temperature of the associations 120. The heat exchange is made to the process of raising to the heating water in the water tank 115. And the inlet and outlet (110a, 110b) for introducing and discharging the heating water into the water tank 115 in the boiler outer cylinder 110 to circulate while the heating water in the water tank 115 is constantly supplied into the water tank 115. Are installed respectively.

On the other hand, the lower portion of the boiler outer cylinder 110, there is a flow chamber 105 for communicating the flue 103 and the tube 120 to exhaust the combustion gas passed through the tube 120 through the flue (103) Formed. A noise container 107 is provided between the flue 103 and the flow chamber 105 to reduce the noise generated when the burner 113 is operated to the outside through the flue 103. That is, in the condensing boiler according to the present embodiment, the fuel is burned in the combustion chamber 111 by the burner 113, and the high-temperature combustion gas generated after the combustion is associated with the pipe 120, the flow chamber 105, and the noise chamber 53. ) And discharged to the outside while passing through the year (60) in turn.

In addition, the water tank 115 formed outside the combustion chamber 111 is provided with a hot water supply pipe 109 for wrapping the circumference of the combustion chamber 111 in a coil form. That is, the hot water supply pipe 109 is installed outside the combustion chamber 111 in which the temperature rises fastest, so that the hot water is circulated to the hot water supply pipe 109 when it is necessary to use hot water within a short time. Hot water can be used as soon as possible apart from the heating water.

Referring to FIGS. 3 and 4 again, in the inside of the tank 115 in which the pipes 120 are installed, the turbulent water is collected and circulated in the tank 115 so that the turbulence is formed when the water is circulated in the tank 115. Hence, the water hammer plate 130 is installed to increase the heat exchange efficiency of the pipe 120 and the heating water.

The water-receiving plate 130 has an associated through-hole 131 is formed to fit the association 120 is installed in the center of the water tank 115, a certain interval so that more turbulence can be formed when the heating water is circulated It is provided with one or more. At this time, the outer surface of the water hammer plate 130 is spaced apart from the inner surface of the water tank 115 by the heating water circulating inside the water tank 115, the gap between the water hammer plate 130 and the water tank 115 is narrowed the call This is because the heating water generates more turbulence. Then, the convection of the heating water inside the water tank 115 is made more effective, so that the heat exchange efficiency with the pipe 120 is increased.

The distance between the outer surface of the water hammer plate 130 and the inner surface of the water tank 115 according to this embodiment is preferably 2mm ~ 4mm. If the distance between the outer surface of the water hammer plate 130 and the inner surface of the water tank 115 is less than 2mm, not only does not circulate smoothly when the heating water is circulated in the water tank 115, but also the water heating plate and the water tank plate 130 and the water tank When passing between the 115 is generated a lot of pressure on the water hammer plate (130). In addition, when excessive pressure is generated in the water hammer plate 130, the water hammer plate 130 supported by the associations 120 may move.

And when the separation distance between the outer surface of the water hammer plate 130 and the inner surface of the water tank 115 exceeds 4mm, the generation of turbulence is reduced when the heating water passes between the water hammer plate 130 and the water tank 115, the heat exchange efficiency Is lowered.

In the present embodiment, it is shown that three water hammer plates 130 are installed inside the water tank 115, but according to the size of the condensing boiler, the size of the water tank 115, and the amount of heating water, The number of installation can be adjusted freely.

The water hammer plate 130 is provided with a fluid circulation pipe 133 through which the heating water flows so that excessive water pressure is prevented from occurring in the water hammer plate 130 when the heating water passes between the water hammer plate 130 and the water tank 115. have. One end of the fluid circulation pipe 133 is coupled to one of the water receiving plates 130 located at the top of the water tank 115 of the water receiving plates 130, and the other end thereof is the water tank of the water receiving plates 130. It is coupled to the other water hammer plate 130 located at the bottom in the (115). The diameter of the fluid circulation pipe 133 according to this embodiment is preferably 10mm.

On the other hand, the water hammer plate 130 according to the present embodiment is installed in a rectangular shape through the tube 120 is penetrated at regular intervals along the circumferential direction of the water hammer plate 130, in a row at the center of the water hammer plate 130 It is installed. The rectangular shape of the plumb 120 is to increase the number of the plumb 120 coupled to the water hammer plate 130 and to increase the contact area with the heated water to increase the heat exchange efficiency with the heated water.

When the associations 120 are installed through the water hammer plate 130, one or more of the associations 120 may be installed to be spaced apart from the associated through hole 131 of the water hammer plate 130 by a predetermined distance. have. This is to increase the turbulence of the heating water by reducing the water pressure generated in the water hammer plate 130 by allowing the heating water to pass through the various parts of the water hammer plate 130 when passing through the water hammer plate 130.

The operation and operation of the condensing boiler according to the present embodiment configured as described above will now be described in detail.

First, when the burner 113 is ignited to heat the heating water, the combustion gas heated by the burner 113 is moved along the tubes 120 in the combustion chamber 111, and the heat of the heated combustion gas is associated with the associated gas ( After passing through the pipes 120 while raising the temperature of the 120, the exhaust pipe 105 is discharged to the outside of the boiler while passing through the noise chamber 53 and the flue 60 in turn. At this time, the heating water is supplied into the water tank 115 through the inlet 110a of the boiler outer cylinder 110, and the heating water circulates inside the water tank 115 to be in contact with the pipes 120 to exchange heat. The temperature rises. And the heating water whose temperature is raised is discharged to the outside of the water tank 115 through the outlet 110b of the boiler outer cylinder (110).

At this time, the heating water flowing into the water tank 115 through the inlet 110a is more turbulent in the process of circulating inside the water tank 115 by the water hammer plate 130 provided inside the water tank 115. Will occur. Then, the convection of the heating water is promoted so that heat exchange with the associations 120 occurs more quickly, thereby increasing the temperature of the heating water more quickly. That is, when the heating water passes between the water-receiving plates 130 and the water tank 115, more turbulence of the heating water is generated, and convection of the heating water becomes more effective, thereby increasing the heat exchange efficiency with the pipe 120. do.

What has been described above is only one embodiment for carrying out the present invention, and the present invention is not limited to the above-described embodiments, and the present invention is not limited to the scope of the present invention as claimed in the following claims. Anyone with ordinary knowledge in the field of the invention will have the technical spirit of the present invention to the extent that various modifications can be made.

1 is a cross-sectional view showing the structure of a general condensing boiler.

2 is a cross-sectional view showing the structure of a condensing boiler according to an embodiment of the present invention.

Figure 3 is a perspective view showing a state where a water hammer plate is installed in the water tank of the condensing boiler according to an embodiment of the present invention.

Figure 4 is a perspective view showing a state in which a fluid circulation pipe is installed on the water hammer plate of the condensing boiler according to an embodiment of the present invention.

♠ Code description for the main part of the drawing ♠

110: outer boiler 115: water tank

120: association 130: water hammer

131: through hole

Claims (7)

  1. A combustion chamber having a burner installed at an upper side thereof, and a boiler outer cylinder having a water tank formed therein so as to circulate fluid inside the combustion chamber;
    Associations installed to penetrate the tank so as to heat the fluid circulating in the tank by using the combustion gas heated in the combustion chamber and communicating with the combustion chamber;
    A water-receiving plate provided inside the tank so that the fluid collected in the tank is circulated in the tank and is purified as turbulence is formed;
    Condensing boiler comprising a.
  2. The method of claim 1,
    The associating is formed in a rectangular condensing boiler.
  3. The method of claim 2,
    The water hammer plate is condensing boiler, characterized in that the outer surface is spaced apart from the inner surface of the water tank 2mm ~ 4mm, perpendicular to the tube.
  4. The method according to any one of claims 1 to 3,
    And a fluid circulation pipe through which the fluid flows is provided in the water hammer so that the pressure generated by the water hammer is lowered when the fluid is circulated in the water tank.
  5. The method of claim 4, wherein
    Condensing boiler, characterized in that a plurality of water hammer is installed to have a predetermined interval.
  6. The method of claim 4, wherein
    The fluid circulation pipe is a condensing boiler, characterized in that the diameter of 10mm or less.
  7. The method according to any one of claims 1 to 3,
    Condensing boiler, characterized in that the one or more of the associations that are installed through the water hammer plate so that the outer surface has a predetermined distance from the water hammer plate.
KR1020070130800A 2007-12-14 2007-12-14 Condensing type boiler KR20090063438A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070130800A KR20090063438A (en) 2007-12-14 2007-12-14 Condensing type boiler

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020070130800A KR20090063438A (en) 2007-12-14 2007-12-14 Condensing type boiler
PCT/KR2008/006438 WO2009078577A1 (en) 2007-12-14 2008-10-31 Boiler for improving heat exchanging property

Publications (1)

Publication Number Publication Date
KR20090063438A true KR20090063438A (en) 2009-06-18

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Application Number Title Priority Date Filing Date
KR1020070130800A KR20090063438A (en) 2007-12-14 2007-12-14 Condensing type boiler

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KR (1) KR20090063438A (en)
WO (1) WO2009078577A1 (en)

Cited By (4)

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WO2013108977A1 (en) * 2012-01-19 2013-07-25 Choi Sung-Hwan Hot water storage tank-type condensing boiler having multi-stage structure
WO2013172547A1 (en) * 2012-05-15 2013-11-21 Daesung Industrial Co. Ltd. Condensing heat exchanger and boiler/water hearter including the same
WO2014098282A1 (en) * 2012-12-20 2014-06-26 Choi Sung-Hwan Condensing hot water boiler
WO2017171276A1 (en) * 2016-03-28 2017-10-05 주식회사 경동나비엔 Tubular heat exchanger

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PL219104B1 (en) 2011-04-07 2015-03-31 Aic Spółka Akcyjna Heat exchanger
PL2710306T3 (en) 2011-05-17 2017-12-29 Aic S.A. Boiler
PL220726B1 (en) 2011-09-29 2015-12-31 Aic Spółka Akcyjna Heat exchanger for a condensing boiler
PL220570B1 (en) 2012-03-22 2015-11-30 Aic Spółka Akcyjna Fired heat exchanger
PL223959B1 (en) * 2012-03-23 2016-11-30 Aic Spółka Akcyjna Dual heat exchanger
AT513731A1 (en) * 2012-11-26 2014-06-15 Vaillant Group Austria Gmbh boiler
KR101606264B1 (en) * 2014-04-22 2016-03-24 최영환 Heat exchanger having circulating guide
PL229328B1 (en) 2015-12-21 2018-07-31 Aic Spolka Akcyjna Fired heat exchanger
CN109564068A (en) * 2016-09-09 2019-04-02 庆东纳碧安株式会社 Conduit assembly for tube body type heat exchanger and the tube body type heat exchanger including this
EP3692304A2 (en) 2017-10-03 2020-08-12 Enviro Power, Inc. Evaporator with integrated heat recovery
KR20200128321A (en) * 2019-05-03 2020-11-12 주식회사 경동나비엔 Oil boiler
CN110701780A (en) * 2019-10-09 2020-01-17 夏登明 Gas boiler

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KR100447443B1 (en) * 2002-09-03 2004-09-07 최진민 Boiler with dual water chamber
KR100484123B1 (en) * 2003-03-19 2005-04-20 주식회사 경동보일러 Condensing oil boiler
KR100724601B1 (en) * 2006-02-17 2007-06-04 (주)귀뚜라미보일러 Condesing boiler

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Publication number Priority date Publication date Assignee Title
WO2013108977A1 (en) * 2012-01-19 2013-07-25 Choi Sung-Hwan Hot water storage tank-type condensing boiler having multi-stage structure
WO2013172547A1 (en) * 2012-05-15 2013-11-21 Daesung Industrial Co. Ltd. Condensing heat exchanger and boiler/water hearter including the same
KR101388344B1 (en) * 2012-05-15 2014-04-22 대성산업 주식회사 A condensing heat exchanger and a boiler with the condensing heat exchanger
US9557075B2 (en) 2012-05-15 2017-01-31 Daesung Industrial Co. Ltd. Condensing heat exchanger and boiler/water heater including the same
WO2014098282A1 (en) * 2012-12-20 2014-06-26 Choi Sung-Hwan Condensing hot water boiler
WO2017171276A1 (en) * 2016-03-28 2017-10-05 주식회사 경동나비엔 Tubular heat exchanger
CN108885026A (en) * 2016-03-28 2018-11-23 庆东纳碧安株式会社 Tube body type heat exchanger
RU2717176C1 (en) * 2016-03-28 2020-03-18 Киунгдонг Навиен Ко., Лтд. Tubular heat exchanger

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