Heat exchange tube, condensing heat exchanger and gas water heater

Abstract

The utility model provides a heat exchange pipe, a condensation heat exchanger and a gas water heater, and belongs to the technical field of hot water equipment. The heat exchange tube comprises at least two layers of heat exchange tube sets, and each layer of heat exchange tube set is composed of a plurality of heat exchange tubes. One ends of two adjacent heat exchange tubes in each layer of heat exchange tube group are connected through a horizontal connecting tube; and the other ends of the two vertically adjacent heat exchange tubes in the two adjacent layers of heat exchange tube groups are connected through an upper connecting tube and a lower connecting tube. The interior of each layer of heat exchange pipe set and different layers of heat exchange pipe sets are connected through horizontal connecting pipes, upper connecting pipes and lower connecting pipes, and a complex three-dimensional heat exchange network is formed. And the total heat exchange area is increased, so that the heat exchange efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hot water equipment technical field, especially a heat exchange tube, condensing heat exchanger and gas water heater. BACKGROUND

[0002] With the continuous development of industrial technology, as the key equipment in energy conversion, cooling system and various industrial processes, the performance and efficiency of heat exchanger directly affect the operation effect of the whole system. The traditional heat exchanger usually adopts single-layer or multi-layer parallel arrangement of straight pipe or elbow pipe structure, and realizes heat exchange through the temperature difference of fluid inside and outside the pipeline. However, these traditional designs have the problems of limited heat exchange area, low heat transfer efficiency and low space utilization, especially when facing complex working conditions or limited installation space, it is difficult to meet the demand of high efficient heat exchange. SUMMARY

[0003] In view of the above problems, the utility model provides a heat exchange tube which optimizes the layout and connection mode of heat exchange tube group and improves the heat exchange efficiency and space utilization.

[0004] In the first aspect, a heat exchange tube is provided, which comprises at least two layers of heat exchange tube groups, each layer of the heat exchange tube group is composed of a plurality of heat exchange tubes;

[0005] One end of each adjacent two heat exchange tubes in each layer of the heat exchange tube group is connected by a horizontal connecting pipe;

[0006] The other end of each adjacent two heat exchange tubes in each adjacent two layers of the heat exchange tube group is connected by an up-down connecting pipe.

[0007] Further, the at least two layers of heat exchange tube groups are arranged at intervals.

[0008] Further, the plurality of heat exchange tubes in each layer of the heat exchange tube group are arranged at intervals.

[0009] Further, it also includes a water inlet pipe and a water outlet pipe;

[0010] The water inlet pipe is vertically arranged, and the top end is connected with one end of the heat exchange tube close to the first outer side in the lowest layer of the heat exchange tube group;

[0011] The water outlet pipe is vertically arranged, and the top end is connected with one end of the heat exchange tube close to the second outer side in the lowest layer of the heat exchange tube group;

[0012] The first outer side in the heat exchange tube group and the second outer side in the heat exchange tube group are oppositely arranged.

[0013] Further, the water inlet pipe and the water outlet pipe are inclinedly arranged, so that the bottom end of the water inlet pipe and the bottom end of the water outlet pipe are close to each other.

[0014] Further, the bottom end of the water inlet pipe is arranged below one end of the heat exchange pipe close to the bottom end of the water outlet pipe.

[0015] Further, the horizontal connecting pipe and / or the up-and-down connecting pipe is a bent pipe.

[0016] Further, the radius of the circle where the horizontal connecting pipe and / or the up-and-down connecting pipe is arranged is the same as the minimum bending radius of the heat exchange pipe.

[0017] In a second aspect, a condensing heat exchanger is provided, comprising a shell and the heat exchange pipe as described in the above technical solution.

[0018] The shape of the heat exchange pipe is adapted to the shape of the shell.

[0019] The heat exchange pipe is arranged in the shell.

[0020] In a third aspect, a gas water heater is provided, comprising the condensing heat exchanger as described in the above technical solution.

[0021] The embodiments of the utility model have the following advantages or beneficial effects:

[0022] The heat exchange pipe groups in each layer are connected to each other through the horizontal connecting pipe and the up-and-down connecting pipe, and a complex three-dimensional heat exchange network is formed. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and other features and advantages of the utility model will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

[0024] Figure 1 is a first perspective view of a heat exchange pipe according to an example embodiment;

[0025] Figure 2 is a second perspective view of a heat exchange pipe according to an example embodiment;

[0026] Figure 3 is a front view of a heat exchange pipe according to an example embodiment;

[0027] Figure 4 is a side view of a heat exchange pipe according to an example embodiment;

[0028] Figure 5 is a top view of a heat exchange pipe according to an example embodiment;

[0029] Figure 6 is a first perspective view of a condensing heat exchanger according to an example embodiment;

[0030] Figure 7 is a second perspective view of a condensing heat exchanger according to an exemplary embodiment;

[0031] Figure 8 is a structural schematic view of a gas water heater according to an exemplary embodiment.

[0032] In which, the reference signs are explained as follows:

[0033] 1, heat exchange tube, 2, horizontal connecting pipe, 3, up and down connecting pipe, 4, water inlet pipe, 5, water outlet pipe, 6, shell, 7, exhaust fan, 8, exhaust port;

[0034] 61, housing, 62, cover body;

[0035] 611, first housing, 612, second housing, 613, smoke inlet interface, 614, smoke outlet interface. DETAILED DESCRIPTION

[0036] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and thus a detailed description of the same will be omitted.

[0037] The terms "one", "a", "an", "the", "said", are used to mean one or more of something, unless otherwise indicated; the terms "comprises", "comprising", "includes", "including", or the like, means the inclusion of something, without limitation, and is not meant to exclude or be limited to the listed items.

[0038] Figure 1 is a first perspective view of a heat exchange tube according to an exemplary embodiment; Figure 2 is a second perspective view of a heat exchange tube according to an exemplary embodiment; Figure 3 is a front view of a heat exchange tube according to an exemplary embodiment; Figure 4 is a side view of a heat exchange tube according to an exemplary embodiment; Figure 5 is a top view of a heat exchange tube according to an exemplary embodiment. The above schematic views are only to show the structural relationship related to the invention point, and not as the actual proportion of the actual product.

[0039] As Figures 1 to 5As shown, the heat exchange pipe of the embodiment of the utility model, including at least two layers of heat exchange pipe group, each layer of heat exchange pipe group is formed by multiple heat exchange pipes, the one end (namely rear end) of adjacent two heat exchange pipes 1 in each layer of heat exchange pipe group is connected through horizontal connecting pipe 2, the other end (namely front end) of adjacent two layers of heat exchange pipe group's upper and lower adjacent two heat exchange pipes 1 is connected through upper and lower connecting pipe 3.

[0040] The heat exchange pipe is formed by multiple layers of heat exchange pipe groups, and the inside of each layer of heat exchange pipe group and different layers are connected with each other through horizontal connecting pipe 2 and upper and lower connecting pipe 3, forming a complex three-dimensional heat exchange network. Such design can effectively increase the heat exchange area and improve the heat exchange efficiency.

[0041] In an embodiment, the horizontal connecting pipe 2 and / or the upper and lower connecting pipe 3 is a bent pipe.

[0042] When viewed from the top, a plurality of U-shaped patterns arranged in sequence can be seen. Each U-shaped represents the projection of two heat exchange pipes 1 and the horizontal connecting pipe 2 connecting the two heat exchange pipes 1 on the plane. The horizontal connecting pipe 2 is located at the bottom of the U-shaped, connecting adjacent U-shaped together to form a series of U-shaped structures.

[0043] The multiple layers of heat exchange pipe groups are connected through the upper and lower connecting pipe 3, forming a three-dimensional array of heat exchange pipes 1.

[0044] When viewed from the side, the entire heat exchange pipe presents a transverse U-shaped feature. The upper and lower connecting pipe 3 is located at the bottom of the U-shaped. The other end of the upper and lower adjacent two heat exchange pipes 1 in the adjacent two layers is connected through the upper and lower connecting pipe 3. This not only ensures the flow of fluid between different levels, but also enhances the stability of the entire structure. The upper and lower connecting pipe 3 ensures that the fluid can smoothly transition from one layer to another.

[0045] Due to the adoption of the multi-layer U-shaped structure, the heat exchange area is greatly increased, and the design of the fluid path also helps to strengthen the convective heat transfer. This design allows a large number of heat exchange pipes 1 to be arranged in a relatively small space, which is very suitable for limited space application scenarios. Through the design of the horizontal connecting pipe 2 and the upper and lower connecting pipe 3, the uniform distribution of fluid in the entire heat exchange system is ensured, avoiding the problem of local overheating or insufficient cooling.

[0046] The heat exchange pipe 1, the upper and lower connecting pipe 3, and the horizontal connecting pipe 2 are of an integrated structure, formed by bending a single pipe multiple times. When processing and manufacturing, the entire process from raw material preparation to final assembly needs to be considered step by step. The following is the detailed manufacturing procedure:

[0047] Select appropriate pipe materials (such as copper, stainless steel, carbon steel, etc.) according to the application environment and working medium, to ensure good thermal conductivity and corrosion resistance.

[0048] Determine the required heat exchange tube diameter, wall thickness, and length, which will directly affect the minimum bending radius and final structural strength.

[0049] Cut the pipe to the appropriate length according to design requirements.

[0050] End face processing of the cut pipe to ensure flatness and parallelism for subsequent welding or connection operations.

[0051] Thoroughly clean the inner and outer surfaces of the pipe to remove oil, oxidation layer, and other impurities, and check for cracks or other defects.

[0052] Customize a dedicated bending die according to the required U-shaped bending radius and angle to ensure that the specified minimum bending radius can be achieved.

[0053] Use a professional pipe bender (such as a numerical control pipe bender) to bend, ensuring that the length of the heat exchange tube 1, the upper and lower connecting pipes 3, and the horizontal connecting pipe 2 meet the design requirements.

[0054] Maintain uniform pressure distribution during bending to avoid deformation or damage caused by local stress concentration.

[0055] Immediately after each bending, check the quality of the bent pipe, including the bending angle, roundness, and smoothness, to ensure that there are no damages or wrinkles.

[0056] Heat exchange tubes can be made of various types of pipe materials, such as:

[0057] Straight pipe, a smooth-walled metal pipe, is the most traditional heat exchange tube 1 form. It is simple to manufacture and has lower cost. It is suitable for most standard working conditions.

[0058] Finned tube, with fins added to the outer surface of the ordinary pipe to increase the heat exchange area. It significantly improves heat exchange efficiency, especially in air-side heat exchange. It improves the convective heat transfer coefficient.

[0059] Spiral groove tube, with spiral grooves on the inner wall, is used to enhance turbulence. It improves the degree of internal fluid turbulence and improves heat transfer efficiency. It reduces the boundary layer thickness.

[0060] Bimetallic composite tube, made of two different metal materials combined through a specific process. It combines the advantages of both materials, such as good thermal conductivity and corrosion resistance. It improves structural strength and durability.

[0061] Stainless steel tube, made of stainless steel material, has excellent mechanical properties and corrosion resistance. It is resistant to corrosion, high temperature, and long service life.

[0062] Copper tube, made of copper or copper alloy, has good thermal conductivity and plasticity. It has strong thermal conductivity, is easy to shape, and is suitable for precision machining.

[0063] Aluminum tube, a lightweight metal tube with good thermal conductivity. Lightweight, good thermal conductivity, easy to process. Relatively low cost.

[0064] Corrugated tube, with regular undulating corrugated shape on the inner and outer surfaces, enhances structural characteristics and heat transfer performance. The corrugated structure increases the degree of fluid turbulence, significantly improves the heat transfer efficiency; at the same time, increases the heat transfer surface area. Corrugated tube can better adapt to bending and deformation, making the bending process easier and not causing damage; very suitable for complex layout and limited space. The corrugated structure can absorb mechanical vibration, reduce stress concentration caused by vibration, and prolong the service life; in some cases, it can also play a role in shock absorption and noise reduction. The corrugated tube has certain expansion capability, which can compensate for thermal expansion or contraction through its own expansion when the temperature changes, avoiding stress damage caused by temperature changes.

[0065] The radius of the circle where the horizontal connecting pipe 2 and / or the up-and-down connecting pipe 3 is located is the same as the minimum bending radius of the heat exchange pipe 1. Using the same minimum bending radius as the heat exchange pipe 1 for the horizontal connecting pipe 2 and / or the up-and-down connecting pipe 3 can make the fluid flow more smoothly through the connecting pipe, avoiding additional turbulence loss caused by sudden changes in path.

[0066] In one embodiment, at least two layers of heat exchange pipe groups are arranged at intervals. Multiple heat exchange pipes 1 in each layer of heat exchange pipe group are arranged at intervals.

[0067] In the vertical direction, a certain distance is maintained between the heat exchange pipe groups of different layers (i.e., interlayer spacing). This spacing can be fixed or adjusted according to specific needs.

[0068] Proper spacing between layers allows more medium (such as gas, water, etc.) to come into contact with the surface of the heat exchange pipe 1, thereby increasing the total heat exchange area. Ensuring that the medium can flow evenly between layers avoids local overcooling or overheating, improving heat exchange efficiency. Proper layer spacing reduces the mutual influence between the upper and lower layers, allowing each layer to work independently and effectively.

[0069] Within the same layer, a certain distance is also maintained between adjacent heat exchange pipes 1 (i.e., inter-pipe spacing). These spacings can be adjusted according to actual needs.

[0070] Reasonable inter-pipe spacing helps to break the boundary layer and enhance the degree of fluid turbulence, further improving heat transfer efficiency. Adequate clearance facilitates inspection, cleaning, and necessary maintenance operations by technicians. Avoiding direct contact or friction between heat exchange pipes 1 caused by vibration or other external forces protects the pipes from physical damage.

[0071] The specific spacing design needs to consider the following factors:

[0072] Heat Exchange Requirements: Determine the optimal interlayer and inter-tube spacing based on the required heat exchange capacity.

[0073] Fluid Properties: Consider factors such as velocity, temperature, and pressure of the medium to ensure optimal flow conditions and heat exchange efficiency.

[0074] Structural Strength: Ensure the entire system has sufficient mechanical strength to withstand expected loads.

[0075] Manufacturing Costs: Balance the size of the spacing with manufacturing costs, aiming to minimize costs while meeting performance requirements.

[0076] In one embodiment, it also includes an inlet pipe 4 and an outlet pipe 5; the inlet pipe 4 is vertically arranged, and its top end is connected to one end of the heat exchange tube 1 near the first outer side (i.e., the left end) in the lowest layer of heat exchange tube groups; the outlet pipe 5 is vertically arranged, and its top end is connected to one end of the heat exchange tube 1 near the second outer side (i.e., the right end) in the lowest layer of heat exchange tube groups, wherein the first outer side in the heat exchange tube group and the second outer side in the heat exchange tube group are oppositely arranged.

[0077] The inlet pipe 4 is responsible for introducing the fluid to be heated into the heat exchange tube. By connecting with the heat exchange tube 1 on the left side of the lowest layer, it ensures that the fluid first contacts the bottom of the heat exchange tube.

[0078] The outlet pipe 5 is used to discharge the fluid after heat exchange from the system. By connecting with the heat exchange tube 1 on the right side of the lowest layer, it can effectively collect the fluid that has completed the heat exchange process, ensuring its smooth discharge.

[0079] After the fluid enters from the inlet pipe 4, it first enters the heat exchange tube 1 on the left side of the lowest layer, and finally reaches the heat exchange tube 1 on the right side of the lowest layer, and is discharged through the outlet pipe 5. The fluid exchanges between each layer through the upper and lower connecting pipes 3, forming a complex three-dimensional flow network to maximize heat exchange efficiency.

[0080] The material selection of the inlet pipe 4 and the outlet pipe 5 is the same as that of the heat exchange tube 1.

[0081] In order to ensure the performance, reliability and durability of the entire heat exchange tube, the connection method of the inlet pipe 4 and the outlet pipe 5 with the heat exchange tube 1 is crucial. The following are several connection methods of the inlet pipe 4 and the outlet pipe 5 with the heat exchange tube 1:

[0082] Welded connection, the inlet pipe 4 and the outlet pipe 5 are directly fixed to the heat exchange tube 1 by welding. It provides extremely high mechanical strength. Almost no risk of leakage, suitable for high pressure and high temperature environments.

[0083] Threaded connection, using threaded interfaces for connection, usually with sealing rings to ensure sealing effect. Easy to disassemble and maintain: easy to install and disassemble, convenient for inspection and repair. Relatively simple and economical.

[0084] Flange connections use flanges and bolts to tightly connect the two ends of a pipe, and gaskets are used for sealing. Suitable for large-diameter pipes, ensuring connection strength. Ideal for systems requiring regular maintenance or adjustment.

[0085] Compression fittings use a ferrule and nut to press the pipe end tightly into the fitting, forming a reliable mechanical connection. No welding is required, making it suitable for on-site assembly.

[0086] The integrated structure, with inlet pipe 4, outlet pipe 5, and heat exchange pipe 1 molded together during manufacturing, forms a single, integral component. The absence of additional connection points reduces the risk of potential leaks. The seamless design improves fluid flow paths and reduces turbulence losses. It also reduces on-site installation steps and the likelihood of incorrect installation. Furthermore, it enhances the overall mechanical strength of the system, performing exceptionally well in vibration or shock environments.

[0087] In one embodiment, the inlet pipe 4 and the outlet pipe 5 are arranged at an angle, so that the bottom end of the inlet pipe 4 and the bottom end of the outlet pipe 5 are close to each other.

[0088] The water inlet pipe 4 gradually slopes downwards from its vertical position at the top, eventually approaching the bottom and joining the bottom end of the water outlet pipe 5.

[0089] The outlet pipe 5 also gradually slopes downwards from the top vertical position, and its bottom end is close to the bottom end of the inlet pipe 4.

[0090] The inclined design of the inlet pipe 4 and outlet pipe 5 helps to utilize gravity, allowing fluid to flow into and out of the system more naturally, reducing the energy consumption required for pumping. The inclined design effectively prevents gas from accumulating at the top of the pipes, ensuring smooth fluid flow and improving the stability and efficiency of the system.

[0091] By bringing the bottom ends of the inlet pipe 4 and the outlet pipe 5 close to each other, pipes and other components can be arranged more rationally within a limited space, improving space utilization. The inclined arrangement simplifies the connection between pipes, reduces complexity, and facilitates on-site installation and maintenance.

[0092] In one embodiment, the bottom end of the inlet pipe 4 and the bottom end of the outlet pipe 5 are positioned below one end of the heat exchange tube 1. By positioning the bottom ends of the inlet pipe 4 and the outlet pipe 5 below one end of the heat exchange tube 1, pipes and other components can be arranged more rationally within a limited space, thus improving space utilization.

[0093] Figure 6 This is a first-view perspective view of a condensing heat exchanger according to an exemplary embodiment; Figure 7It is a second perspective view of a condensing heat exchanger according to an exemplary embodiment. The above schematic diagram is only to show the structural relationship related to the invention point, and not as the actual proportion of the actual product.

[0094] As shown in Figures 6 to 7 The utility model discloses a condensing heat exchanger, comprising a shell 6 and the heat exchange pipe as described in the above embodiment, the shape of the heat exchange pipe 1 is matched with the shape of the shell 6, and the heat exchange pipe 1 is arranged in the shell 6.

[0095] The shell 6 comprises a shell body 61 and a cover body 62 fixed to the upper end of the shell body 61, the shell body 61 comprises a first shell body 611 and a second shell body 612, the first shell body 611 is connected with the second shell body 612, the first shell body 611, the second shell body 612 and the cover body 62 jointly enclose a cavity, the second shell body 612 protrudes from the peripheral sidewall of the first shell body 611, the first shell body 611 is provided with a smoke inlet 613 on the side where the second shell body 612 protrudes from the first shell body 611, the lower end of the shell body 61 is provided with a first through hole, a second through hole and a condensate water interface, and the cover body 62 is provided with a smoke outlet 614.

[0096] The heat exchange pipe is installed in the cavity, the water inlet pipe 4 extends from the first through hole, and the water outlet pipe 5 extends from the second through hole.

[0097] Figure 8 It is a structural schematic diagram of a gas water heater according to an exemplary embodiment. The above schematic diagram is only to show the structural relationship related to the invention point, and not as the actual proportion of the actual product.

[0098] As shown in Figure 8 The utility model discloses a gas water heater, comprising the condensing heat exchanger and the smoke exhaust fan 7 as described in the above embodiment. The smoke outlet 8 of the smoke exhaust fan 7 is communicated with the smoke inlet 613.

[0099] In the utility model embodiment, the term "a plurality of" refers to two or more than two, unless otherwise explicitly limited. The terms "mounting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, can also be detachable connection, or integrally connected. For ordinary skilled in the art, the specific meaning of the above terms in the utility model embodiment can be understood according to the specific circumstances.

[0100] In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments of the present application and simplify the description, and do not indicate or imply that the device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it should not be understood as a limitation on the embodiments of the present application.

[0101] In the description of the present application, the terms "one embodiment", "one preferred embodiment" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0102] The above is only the preferred embodiment of the present application, and is not intended to limit the embodiments of the present application. For those skilled in the art, the embodiments of the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A heat exchange tube characterized by, The heat exchange tube group comprises at least two layers, each layer of the heat exchange tube group is composed of a plurality of heat exchange tubes; One end of each two adjacent heat exchange tubes (1) in each layer of the heat exchange tube group is connected by a horizontal connecting pipe (2); The other end of each two adjacent heat exchange tubes (1) in adjacent layers of the heat exchange tube group is connected by an up-down connecting pipe (3).

2. A heat exchange tube according to claim 1, wherein The at least two layers of the heat exchange tube group are arranged at intervals.

3. A heat exchange tube as claimed in claim 1, wherein The plurality of heat exchange tubes (1) in each layer of the heat exchange tube group are arranged at intervals.

4. A heat exchange tube as claimed in claim 1, wherein The heat exchange tube group further comprises a water inlet pipe (4) and a water outlet pipe (5); The water inlet pipe (4) is vertically arranged, and the top end is connected to one end of the heat exchange tube (1) close to the first outer side in the heat exchange tube group of the lowermost layer; The water outlet pipe (5) is vertically arranged, and the top end is connected to one end of the heat exchange tube (1) close to the second outer side in the heat exchange tube group of the lowermost layer; The first outer side of the heat exchange tube group and the second outer side of the heat exchange tube group are oppositely arranged.

5. A heat exchange tube according to claim 4, wherein The water inlet pipe (4) and the water outlet pipe (5) are obliquely arranged, so that the bottom end of the water inlet pipe (4) and the bottom end of the water outlet pipe (5) are close to each other.

6. A heat exchange tube according to any one of claims 4 or 5, wherein The bottom end of the water inlet pipe (4) and the bottom end of the water outlet pipe (5) are arranged below one end of the heat exchange tube (1).

7. A heat exchange tube as claimed in claim 1, wherein The horizontal connecting pipe (2) and / or the up-down connecting pipe (3) is a bent pipe.

8. A heat exchange tube according to claim 7, wherein The radius of the circle where the horizontal connecting pipe (2) and / or the up-down connecting pipe (3) is located is the same as the minimum bending radius of the heat exchange tube (1).

9. A condensing heat exchanger, characterized by The heat exchange tube group further comprises a shell (6) and the heat exchange tube as claimed in any one of claims 1 to 8. The shape of the heat exchange tube (1) is matched with the shape of the shell (6). The heat exchange tube (1) is arranged in the shell (6).

10. A gas water heater, characterized by, The condensation heat exchanger comprises the heat exchange tube as claimed in claim 9.

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