WO2025110959A1

WO2025110959A1 - New generation condensing ecological heat exchanger

Info

Publication number: WO2025110959A1
Application number: PCT/TR2024/051310
Authority: WO
Inventors: Mehmet Sahin
Original assignee: Salmex Isi Sanayi Ve Ticaret AS
Current assignee: Salmex Isi Sanayi Ve Ticaret AS
Priority date: 2023-11-24
Filing date: 2024-11-08
Publication date: 2025-05-30
Anticipated expiration: 2026-05-24

Abstract

The invention relates to a heat exchanger (1) for use in combi boilers comprising at least one body (10), at least one burner (16) for generating heat within said body (10), and at least one water pipe (30) for heating the water transported therein with the heat received from said burner (16). The novelty of the invention is characterized in that it comprises at least one first heating chamber (11 ) inside the body (10) also accommodating the burner (16), at least one second heating chamber (12) adjacent to said first heating chamber (11) with at least one first separator (21 ) therebetween, and at least one condensing chamber (13) adjacent to the second heating chamber (12) with at least one second separator (22) therebetween, and that it comprises at least one scroll wall (14) inside said condensing chamber (13).

Description

NEW GENERATION CONDENSING ECOLOGICAL HEAT EXCHANGER

TECHNICAL FIELD

The invention relates to a heat exchanger for use in combi boilers comprising at least one body, at least one burner for generating heat within said body, and at least one spiral water pipe for heating the water transported therein with the heat received from said burner.

PRIOR ART

Combi boilers are devices used in hot water production and heating systems. Combi boilers are often used for heating and hot water supply in houses or other buildings and include an integrated heat exchanger for hot water production. This heat exchanger provides the hot water needed by the users by heating the water inside the combi boiler. Combi boiler heat exchangers have the ability to produce instant hot water. When the user turns on the hot water, the combi boiler quickly heats the water, bringing it to the desired temperature and delivering it to the user. This provides users with constant access to hot water and helps them save energy without the need for a separate hot water tank. The heat exchanger is used to ensure the production of hot water, which is one of the main functions of the combi boiler, and is therefore an essential part of the combi boiler operation.

The Application No. US2007209606A1 known in the literature is related to a heat exchanger. The object of the invention is to provide a heat exchanger with a simple structure, high heat recovery rate, and increased efficiency. Said heat exchanger of the invention comprises an area enclosed by a coiled pipe in the axially intermediate part of the housing. It comprises a compartment dividing it into the first and second regions and dividing the coiled pipe into the first and second sections. The combustion gas fed into the first region flows into a combustion gas path by passing through an opening of the first heat exchange section. It then passes through an opening of the second heat exchange section. Application No. 2021/004423 known in the literature provides a heat exchanger for gas condensing boilers fed by a vessel body, in which at least one pipe bundle is placed to limit a combustion chamber. At least one pipe bundle is created with a spiral of pipes wound around a central axis. A first end of the pipe serves as an inlet for the heat transfer fluid to be heated. A second end of the pipe serves as an outlet for said heat transfer fluid. The pipe bundle is made as a single component, defined by a single continuous element. The pipe bundle has an elliptical cross section with said ends with a circular cross section protruding from said vessel body, thus ensuring the accessibility of the ends from the outside to facilitate the processes of connecting them to the pipes of the water system. A method for producing the pipe bundle comprises shaping an elliptical section of a pipe by mechanical processes for plastic deformation in order to achieve a cross-sectional change from elliptical to circular.

The main problem encountered in heat exchanger technology is the heating problem. When the combusted hot gas taken from the burner cannot be brought into contact with the water pipe in the desired amount, the combusted gas is discharged before the water can be heated by the desired amount. In this case, energy waste occurs and reduces preferability.

As a result, all the above-mentioned problems have made it imperative to make an innovation in the relevant technical field.

SUMMARY OF THE INVENTION

The present invention relates to a combi boiler heat exchanger for eliminating the above-mentioned disadvantages and bringing new advantages to the relevant technical field.

An object of the invention is to introduce a combi boiler heat exchanger with improved thermal efficiency.

To achieve all the objects mentioned above and that will emerge from the following detailed description, the present invention is a heat exchanger for use in combi boilers comprising at least one body, at least one burner for generating heat within the body, and at least one water pipe for heating the water transported therein with the heat received from said burner. Accordingly, its novelty is that it comprises at least one first heating chamber inside the body also accommodating the burner, at least one second heating chamber adjacent to said first heating chamber with at least one first separator therebetween, and at least one condensing chamber adjacent to the second heating chamber with at least one second separator therebetween, and that it comprises at least one scroll wall inside said condensing chamber. Thus, a multi-compartment heat exchanger structure with increased thermal efficiency is obtained.

A possible embodiment of the invention is characterized in that the water pipe is essentially of a spiral structure, and the water inlet is located in the vicinity of the condensing chamber and the water outlet is located in the vicinity of the first heating chamber. Thus, the hot water production process is optimized and the efficient use of energy is ensured.

Another possible embodiment of the invention is characterized in that it comprises at least one transition section for the transport of combusted gas between the first heating chamber, the second heating chamber, and the condensing chamber. This ensures effective transport of combusted gas and heat transfer.

Another possible embodiment of the invention is characterized in that it comprises at least one condensate water drain operating with siphon technique for the drainage of condensate formed in the transition sections and in the condensing chamber. This ensures effective drainage of condensate water and efficient operation of the heat exchanger.

Another possible embodiment of the invention is that the first separator is in closed form with the width of a spiral water pipe. This ensures effective separation of combusted gas and water.

Another possible embodiment of the invention is characterized in that the second separator has a hole in the center. This ensures that the combusted gas passes through the second separator and is directed to the condensing chamber. Another possible embodiment of the invention is characterized in that the spiral water pipe comprises at least one sealing element at the inlet and outlet. This ensures sealing to prevent water leakage and energy loss.

BRIEF DESCRIPTION OF THE DRAWING

Fig. 1 shows a representative perspective view of the heat exchanger of the invention.

Fig. 2 shows a representative cross-sectional view of the heat exchanger of the invention.

Fig. 3 shows a representative exploded view of the heat exchanger of the invention.

DETAILED DESCRIPTION OF THE INVENTION

In this detailed description, the subject of the invention is explained by way of example only for a better understanding of the subject, which shall not create any limiting effect.

Fig. 1 shows a representative perspective view of the heat exchanger (1 ) of the invention. Accordingly, a heat exchanger (1) is a device used in the production of hot water. By heating the water, it provides users with the desired hot water. It is often used for heating and hot water supply in houses or other buildings. The heat exchanger (1) allows the water to be heated by the combination of various components. The burner (16) comprises at least one body (10). Said body (10) serves as a closed chamber for heat transfer to the water. The body (10) is configured such that it can be obtained from the combination of two or more parts or can be manufactured in one piece. Various insulation materials are located on the body (10) which prevent the transfer of heat to the external environment. At least one burner (16) is located in the body (10). Said burner (16) essentially allows the combustion gas to be ignited and converted into heat. Many homogeneously distributed holes are located on the burner (16) allowing the heat to be evenly distributed in the coiled water pipe (30).

Fig. 2 shows a representative cross-sectional view of the heat exchanger (1 ) of the invention. Accordingly, there is at least one water pipe (30) located in the body. Said water pipe (30) is at least partially run through the body (10). In the preferred embodiment of the invention, the water pipe (30) is of a spiral, coiled structure. The spiral water pipe (30) comprises at least one water inlet (31) and at least one water outlet (32). Water enters the spiral water pipe (30) through the water inlet (31) and is drained from the water outlet (32). The water inlet (31) is located on the body (10), preferably in the vicinity of the condensing chamber (13) and the water outlet (32) in the vicinity of the first heating chamber.

Fig. 3 shows a representative exploded view of the heat exchanger (1 ) of the invention. Accordingly, there is at least one first heating chamber (11), at least one second heating chamber (12) and at least one condensing chamber (13) located on the heat exchanger (1). All three parts are located in the body (10) and there is at least one first separator (21) and at least one second separator therebetween to separate them from each other. The diameter of the first separator (21 ) is more than the inner diameter of the spiral water pipe (30) coil, and less than the inner diameter of the heat exchanger (1) body (10). The first separator (21) is inserted between the two windings in the water pipe (30). The diameter of the second separator is equal to the inner diameter of the heat exchanger (1 ) body (10). There is a circular hole/gap located in the center of the second separator. The second separator is located between the two windings on the side facing the condensing chamber (13) relative to the first separator (21) in the spiral water pipe (30) coil.

First heating chamber refers to the section inside the heat exchanger (1 ) where the water is heated and hot water is produced. The burner (16) is also located in the first heating chamber. The gas exiting the burner (16) moves in the radial direction within the volume of the heat exchanger (1), passes between the corresponding spiral water pipe (30) coils and moves towards the heat exchanger (1 ) body (10). Through the gap between the spiral water pipe (30) coil and the heat exchanger (1) body (10), the combusted gas moves down in the axial direction to the lower level of the first separator (21 ) in the heat exchanger (1). In this region constituting the first stage of the combusted gas flow, the highest heat transfer between the combusted gas and the water takes place. There are transition sections (17) on the body (10) to allow the transfer gas to be displaced between the separate sections.

The second heating chamber (12) is a section used to optimize the production of hot water. The cold water is heated in the second heating chamber (12) before it is heated in the first heating chamber (11) according to the progress direction. In this way, the reuse of the heat obtained from the burner (16) is ensured. A first separator (21 ) is located between the first heating chamber and the second heating chamber (12). In this way, the combusted gas transported around the water pipe (30) is used for reheating. The combusted gas passes between the spiral water pipe (30) coils between the first separator and the second separator and moves in the radial direction towards the center of the heat exchanger (1). The combusted gas is directed axially through the hole/gap in the center of the second separator into the scroll wall (14) below. In this region constituting the second stage of the combusted gas flow, heat transfer occurs at the secondary level between the combusted gas and water. At this stage, condensate formation also occurs.

The condensing chamber is the last part in the body (10) where the combusted gas is transported. Although the combusted gas in this part is cooled as much as possible, it allows the heat to be absorbed again. Said second separator is located between the condensing chamber (13) and the second heating chamber (12). The condensing chamber (13) is the part where the first heat transfer is applied to the cold water taken from the water inlet (31). There is at least one scroll wall (14) in the condensing chamber (13). Said scroll wall (14) is coiled in shape and allows better heat transfer by directing the transported gas. In this chamber, it is ensured that the gases formed as a result of combustion are condensed and energy is used more efficiently. The scroll wall (14) is a metal plate shaped like a scroll under the second separator, concentric with the second separator. The diameter of the starting edge of the scroll wall (14) is smaller than the diameter of the ending edge. The gas outlet port of the scroll wall (14) is the gap between the starting edge and the ending edge. The initial diameter of the scroll wall (14) is greater than the diameter of the hole/gap in the center of the second separator. The end diameter of the scroll wall (14) is smaller than the inner diameter of the spiral water pipe (30) coil. The scroll wall (14) and the second separator are mounted in such that the connection surface between them is sealed. The design of the heat exchanger (1) body (10) is designed such that the combusted gas can reach the gas exhaust outlet only after one full rotation in the angular direction around the scroll wall (14) and passing in the radial direction between the corresponding spiral water pipe (30) coils. Under the scroll wall, above the heat exchanger (1 ) there is a circular isolation disk (18) located in the form of a disk. The diameter of the isolation disk is larger than the end diameter of the scroll wall (14) and smaller than the inner diameter of the spiral water pipe (30). The scroll wall (14) is located above the isolation disk (18). Sealing is provided between the scroll wall (14) and the isolation disk (18). If the diameter of the insulation disk is smaller than the inner diameter of the spiral water pipe (30), the hot combusted gas will be directed to the lowest (coldest) coil of the spiral water pipe (30). This effect increases the rate of condensation formation.

The water generated by the condensation process in the condensing chamber (13) is discharged through the condensate water drain (15). The discharge of this water ensures that the heat exchanger (1 ) is functioning properly and efficiently. The condensate water drain (15) essentially works in the siphon logic and is separately associated with the transition sections (17) of the heat exchanger (1 ). For this purpose, two discharge channels can be connected to each other in the condensate water drain (15). Thanks to the condensate water drain (15) having the siphon logic, the heat inside the body (10) is preserved and its discharge to the outside environment is prevented. With the condensate water drain (15), the condensate water accumulated in the transition sections (17) can also be drained. There is at least one sealing element (19) on the inlet and outlet parts of the spiral water pipe (30) to the heat exchanger (1 ) body (10) and on the inner surfaces of the corresponding channels in the heat exchanger (1) body (10). For this, the corresponding parts of the water pipe (30) are in the form of O- rings. Elastic sealing elements (19) are placed between the outer surface of the spiral water pipe (30) and the channels in the heat exchanger (1 ) body (10), which are suitable with this O-ring shape and snap-fitting into this part. With the sealing elements (19) in the form of O-Ring, the escape/leakage of the combusted hot gas from said region out of the heat exchanger (1) is prevented.

With all this configuration, the benefits of the heat exchanger (1) structure are as follows;

Energy Efficiency: The design of the heat exchanger (1 ) ensures high energy efficiency. It saves energy by maintaining the temperature of the heated water for a longer period. Good insulation minimizes heat loss. The design allows the heat from the burner (16) to be reused. This means less energy use and faster hot water production.

- Faster Hot Water Production: The second heating chamber (12) allows the water to heat up faster, which makes it easier for users to access hot water faster. The condensing chamber (13) ensures that the combusted gases are cooled and condensed. This can lead to additional energy gains and a more efficient water heating process. The design of the scroll wall (14) promotes high heat transfer between gas and water. It also ensures efficient operation of the heat exchanger (1) by draining the condensate water and prevents the heat from escaping from the interior. This design can help to reduce energy costs by improving energy efficiency, facilitate faster access to hot water, and reduce environmental impacts. It can also improve the durability and reliability of the heat exchanger (1 ).

The scope of protection of the invention is specified in the appended claims and cannot be limited to what is described for illustrative purposes in this detailed description. It is clear that a person skilled in the art can produce similar embodiments in the light of what is explained above, without deviating from the main theme of the invention.

REFERENCE NUMERALS GIVEN IN THE DRAWING

I Heat Exchanger

10 Body

I I First Heating Chamber

12 Second Heating Chamber

13 Condensing Chamber

14 Scroll Wall

15 Condensate Water Drain

16 Burner

17 Transition Section

18 Isolation Disk

19 Sealing Element 21 First Separator

22 Second Separator

30 Water Pipe 31 Water Inlet

32 Water Outlet

Claims

1 . A heat exchanger (1 ) for use in combi boilers comprising at least one body (10), at least one burner (16) for generating heat within said body (10), and at least one water pipe (30) for heating the water transported therein with the heat received from said burner (16), characterized in that it comprises at least one first heating chamber (11 ) inside the body (10) also accommodating the burner (16), at least one second heating chamber (12) adjacent to said first heating chamber (11) with at least one first separator (21) therebetween, and at least one condensing chamber (13) adjacent to the second heating chamber (12) with at least one second separator (22) therebetween, and that it comprises at least one scroll wall (14) inside said condensing chamber (13).

2. A heat exchanger (1 ) according to claim 1 , characterized in that the water pipe (30) is essentially of a spiral structure, and the water inlet (31 ) is located in the vicinity of the condensing chamber (13) and the water outlet (32) is located in the vicinity of the first heating chamber (11).

3. A heat exchanger (1) according to claim 1 , characterized in that it comprises at least one transition section (17) for the transport of combusted gas between the first heating chamber (11), the second heating chamber (12), and the condensing chamber (13).

4. A heat exchanger (1) according to claim 3, characterized in that it comprises at least one condensate water drain (15) operating with siphon technique for the drainage of condensate formed in the transition sections (17) and in the condensing chamber (13).

5. A heat exchanger (1 ) according to claim 1 , characterized in that the first separator (21 ) is in closed form with the width of a spiral water pipe (30).

6. A heat exchanger (1) according to claim 1 , characterized in that the second separator (22) has a hole in the center.

7. A heat exchanger (1 ) according to claim 1 , characterized in that the spiral water pipe (30) comprises at least one sealing element (19) at the inlet and outlet.