JP2006038311A - Fin-tube heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce draft resistance and thermal resistance due to accumulation of drain water by improving discharge performance of drain water on a heat transfer fin in a fin-tube heat exchanger. <P>SOLUTION: A guide groove 4a for drain water discharge comprising a slit or the like is provided in a position below each collar part 2 for inserting a heat transfer tube of a fin plate 1 of the fin-tube heat exchanger. By this, drain water adhered to the collar part 2 for heat transfer tube insertion, and a surface of the fin plate 1 is effectively drawn into the guide groove 4a and collected, and downward flowing is promoted. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a structure of a fin tube type heat exchanger.

  In an air conditioner or the like, conventionally, for example, as shown in FIG. 6, FIG. 7 and FIG. 4 (a), a plurality of fin plates 1, 1,. A plurality of heat transfer tube insertion collar portions 2, 2... Provided on the plates 1, 1... And a plurality of heat transfer tubes 21 inserted into the respective color portions 2, 2. , 21... And the plurality of heat transfer tubes 21, 21... On the surfaces of the fin plates 1, 1. A fin tube type heat exchanger composed of a plurality of cut-and-raised portions (slits in the illustrated example) 3a to 3f provided in a wide range is used (see, for example, Patent Document 1).

Japanese Patent No. 3099714 (Specification, page 1-3, FIG. 4)

  However, when the conventional fin tube type heat exchanger as described above is used as an evaporator, the collar portions 2, 2... And the cut and raised portions 3a to 3f of the fin plates 1, 1. As shown in FIGS. 6 and 7, drain water adheres and stays on the lower side of the water as shown on the right side of FIG. 4 (a). There has been a problem of increasing the heat exchange performance.

  The present invention has been made to solve such a problem, and is positioned below each collar portion for inserting a heat transfer tube of a fin plate of a fin tube type heat exchanger, for example, extending vertically. Fin tube heat exchange that effectively improves drain water drainage performance by providing a guide groove for drain water drain such as notches, thereby suppressing increases in ventilation resistance and thermal resistance as described above. The purpose is to provide a vessel.

  In order to achieve the above object, the present invention is configured with the following problem solving means.

(1) First problem-solving means A first problem-solving means of the present invention comprises a plurality of fin plates 1, 1... Arranged in parallel at a predetermined interval, and the plurality of fin plates 1, In the fin tube type heat exchanger composed of a plurality of heat transfer tubes 10, 10... Inserted into the collar portions 2, 2. , 1... Are provided with drain water guide grooves below the collar portions 2, 2... For inserting the heat transfer tubes.

  According to such a configuration, the heat exchanger tube insertion guide is provided below the collar portions 2, 2... For inserting the heat transfer tubes of the fin plates 1, 1,. The drain water generated on the surfaces of the collar portions 2, 2... And the fin plates 1, 1... Is effectively collected and discharged smoothly downward.

(2) Second Problem Solving Means According to a second problem solving means of the present invention, in the configuration of the first problem solving means, the drain water discharge guide groove extends in the vertical direction from the upstream side of the air flow. It is characterized in that a plurality of lines are arranged in parallel on the downstream side.

  According to such a configuration, a plurality of the fin plates 1, 1... Are arranged in parallel from the air flow upstream side to the downstream side under the collar portions 2, 2. The drain water generated on the surfaces of the collar portions 2, 2... For inserting the heat transfer tubes and the fin plates 1, 1. .. Are effectively collected corresponding to the width of the collar portions 2, 2... And smoothly discharged downward.

(3) Third Problem Solving Means The third problem solving means of the present invention is the above-described configuration of the first or second problem solving means. Between the collar portions 2, 2..., A plurality of cut-and-raised portions 3 a to 3 f are arranged in parallel from the upstream side to the downstream side of the air flow. It is characterized by being provided between the raised portions 3a to 3f.

  According to such a configuration, the plurality of cut-and-raised portions 3a to 3a are arranged from the upstream side to the downstream side of the air flow between the collar portions 2, 2. Even in the case where 3f is provided, the bridging of the drain water staying between them can be suppressed and discharged more effectively.

(4) Fourth Problem Solving Means According to a fourth problem solving means of the present invention, in the configuration of the third problem solving means, the drain water discharge guide groove extending in the vertical direction has a plurality of raised portions. 3a to 3f are also provided.

  According to such a configuration, the drain water staying on each of the cut and raised portions 3a to 3f is also effectively collected in the same manner and smoothly discharged downward.

(5) Fifth Problem Solving Means According to a fifth problem solving means of the present invention, in the first, second, third or fourth problem solving means, the drain water discharge guide groove is a fin. Are formed by notches 4, 4... That form gaps 4a, 4a.

  According to such a configuration, the gaps 4a, 4a,... Of the notches 4, 4... Forming the gaps 4a, 4a,. It functions as a guide groove for discharging drain water, and drain water is effectively collected and smoothly flows downward.

(6) Sixth Problem Solving Means According to a sixth problem solving means of the present invention, in the first, second, third or fourth problem solving means, the drain water discharge guide groove is a fin. It is characterized by being formed by a notch groove 5 having a V-shaped cross section provided on one side of the plates 1, 1.

  According to such a configuration, the groove portion 5a of the notch groove 5 having a V-shaped cross section provided on one side of the fin plates 1, 1,... Functions as a drain water discharge guide groove, and drain water is effective. Are collected and flowed downward smoothly.

(7) Seventh Problem Solving Means According to a seventh problem solving means of the present invention, in the first, second, third or fourth problem solving means, the drain water discharge guide groove is a fin. It is formed by the rib 6 deform | transformed into the V-shaped cross section from the one surface side of plate 1,1 ... to the other surface side.

  According to such a configuration, the plurality of concave grooves on both sides of the rib 6 deformed into a V-shaped cross section from one side of the fin plates 1, 1... To the other side serve as drain water discharge guide grooves. It functions and drain water is effectively collected on both sides of the fin plates 1, 1... And flows smoothly downward.

(8) Eighth Problem Solving Means The eighth problem solving means of the present invention is the configuration of the first, second, third or fourth problem solving means, wherein the drain groove guide groove is a fin. The plate 1, 1... Is deformed from one side to the other side in a V-shaped cross section, and is further formed by a rib 7 having a notch 7d extending in the vertical direction at the center of the deformed portion.

  According to such a configuration, the fin plates 1, 1... Are deformed into a V-shaped cross section from the one surface side to the other surface side, and further, the both surface sides of the rib 7 having the notches 7d extending in the vertical direction at the center of the deformed portion. The gap formed by the plurality of concave groove portions 7a to 7c and the central cut 7d function as a guide groove for drain water discharge, so that a larger amount of drain water is effectively collected, and the lower side is smoother. To be leaked.

(9) Ninth Problem Solving Means According to a ninth problem solving means of the present invention, in the configuration of the first, second, third, or fourth problem solving means, the drain groove guide groove is a fin. It is formed by the notch part 8 which forms the gap | interval 8a of the level | step difference between both surfaces of plate 1,1, ....

  According to such a configuration, the both-side concave grooves 8b and 8c of the cut portion 8 and the gap 8a between the concave grooves 8b and 8c that form a stepped gap 8a between both surfaces of the fin plates 1, 1. However, it functions as a guide groove for drain water discharge, drain water is effectively collected, and smoothly flows downward.

  As a result of the above, according to the finned tube heat exchanger of the present invention, the retention amount of the drain water on the collar portion for inserting the heat transfer tube and the fin plate surface is greatly reduced, and the ventilation resistance and thermal resistance are reduced. The effective heat exchange performance inherent to the finned tube heat exchanger can be exhibited.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments for carrying out the present invention will be described below with reference to the accompanying drawings.

(First embodiment)
First, FIG. 1 and FIG. 4B show the configuration and operation of the finned tube heat exchanger according to the first embodiment of the present invention.

  As is clear from the above description, for example, when a fin fin type heat exchanger in the form of a plate fin is used as an evaporator, drain water adheres to and stays on the collar portion and plate surface of the fin plate. It becomes resistance and also increases the ventilation resistance and decreases the heat exchange performance.

  Therefore, in this embodiment, as shown in FIG. 1 and FIG. 4 (b), for example, the collar portions 2, 2... For inserting heat transfer tubes of the fin plates 1, 1. .. 4 (4a, 4a,...) Linearly extending in the vertical direction with a predetermined vertical width W (preferably W = 1 mm or more) in the fin plate 1 portion, located below (or between them) .., 4, 4... Are divided into a plurality of rows and divided into two stages.

  The plurality of rows of cuts 4, 4..., 4, 4... In each of the upper and lower two-stage sets fit within the diameter width of the upper and lower collar portions 2 and 2 for heat transfer tube insertion. These are provided at regular intervals from the upstream side to the downstream side and facing the upper and lower side heat transfer tube fitting collar portions 2 and 2 at equal distances.

  According to such a configuration, a plurality of rows of notches 4, 4... 4, 4,..., 4, 4. 4a, 4a... 4a, 4a... 4a, 4a... (See FIG. 4 (b)) are guide grooves for drain water discharge. 4a, 4a,... 4a, 4a,... 4a, 4a... Adhere to the lower portions of the collar portions 2 and 2 for heat transfer tube insertion and the surface of the fin plate 1. Drain water is effectively drawn in and aggregated to facilitate downward flow. And thereby, the increase in ventilation resistance by the drain water of a heat exchanger and the increase in thermal resistance are suppressed effectively.

  As a result of the above, according to the finned tube heat exchanger of this embodiment, the accumulated amount of drain water on the collar portions 2, 2... And the fin plates 1, 1. The air flow resistance and heat resistance are greatly reduced, and the effective heat exchange performance inherent to the finned tube heat exchanger can be sufficiently exhibited.

(Second Embodiment)
Next, FIG.2 and FIG.4 (b) has shown the structure and effect | action of the finned-tube heat exchanger which concerns on the 2nd Embodiment of this invention.

  As is clear from the above description, for example, when a fin-fin type heat exchanger of plate fin type is used as an evaporator, drain water adheres and stays on the collar part or cut-and-raised part of the fin plate. Becomes a heat resistance, and also increases the ventilation resistance and lowers the heat exchange performance.

  Therefore, in this embodiment, for example, as shown in FIG. 2 and FIG. 4B, transmission of fin plates 1, 1... Having a plurality of cut-and-raised portions 3a to 3f of the heat exchanger. Positioned between the cut-and-raised portions 3a to 3f below (or between) the collar portions 2, 2... For inserting the heat tubes, exactly the same as in the first embodiment. Similar to the fin plates 1, 1,..., And in a plurality of gaps 4 a, 4 a, 4 a, 4 a, 4 a, 4 a. .., 4, 4..., 4, 4... Are divided into two upper and lower stages.

  And, the cuts 4, 4... 4, 4,..., 4, 4. 2 within a diameter width of 2 and maintaining a certain distance from the upstream side to the downstream side, and facing each of the upper and lower collar portions 2 and 2 for inserting the heat transfer tubes at an equal distance. Is provided.

  According to such a configuration, the upper and lower two stages of the fin plate 1 portion formed by installing the notches 4, 4... 4, 4,. 4a, 4a ..., 4a, 4a ..., 4a, 4a ... function as a guide groove for drain water discharge, and the gaps 4a, 4a ... 4a, 4a .. 4a, 4a... Drain water adhering to the lower portions of the collar portions 2 and 2 for inserting the heat transfer tubes and the surface of the fin plate 1 is effectively drawn in and gathered downward. Will be promoted. And thereby, the increase in the ventilation resistance by the drain water of a heat exchanger and the increase in a thermal resistance are suppressed effectively.

  In particular, in the case of the above configuration, the air flow below (or between) the collar portions 2, 2... For inserting the heat transfer tubes of the fin plates 1, 1. Even when a plurality of cut-and-raised portions 3a to 3f are provided from the upstream side to the downstream side as shown in the figure, it is more effective by suppressing the bridging of the drain water staying between them. Will be discharged.

  As a result of the above, according to the finned tube heat exchanger of this embodiment, the accumulated amount of drain water on the collar portions 2, 2... And the fin plates 1, 1. The air flow resistance and heat resistance are greatly reduced, and the effective heat exchange performance inherent to the finned tube heat exchanger can be sufficiently exhibited.

(Third embodiment)
Next, FIG.3 and FIG.4 (b) has shown the structure and effect | action of the finned-tube heat exchanger which concerns on the 3rd Embodiment of this invention.

  As is clear from the above description, for example, when a fin-fin type heat exchanger of plate fin type is used as an evaporator, drain water adheres and stays on the collar part or cut-and-raised part of the fin plate. Becomes a heat resistance, and also increases the ventilation resistance and lowers the heat exchange performance.

  Therefore, in this embodiment, for example, as shown in FIG. 3 and FIG. 4B, the heat transfer tube fitting of the fin plates 1, 1... Having the cut-and-raised portions 3a to 3f of the same heat exchanger. Located between the cut-and-raised portions 3a to 3f and the cut-and-raised portions 3a to 3f below (or between) the collar portions 2, 2. ... 4a, 4a... 4a, 4a... Incisions 4, 4. .., 4, 4... Are provided in a plurality of rows and two stages in the vertical direction from the upstream side to the downstream side of the air flow.

  According to such a configuration, there are a plurality of rows of cuts 4, 4..., 4, between the plurality of cut and raised portions 3a to 3f and in each cut and raised portion 3a to 3f. .., 4, 4... Two or more rows of gaps 4a, 4a..., 4a, 4a... 4a, 4a. 4a, 4a... 4a, 4a... 4a, 4a..., 4a, 4a... The drain water adhering to the surfaces of the portions 3a to 3f is effectively drawn in and aggregated to promote downward flow. And thereby, the increase in the ventilation resistance by the drain water of a heat exchanger and the increase in a thermal resistance are suppressed effectively.

  Therefore, in the case of such a configuration, the air flow upstream side to the downstream side of the collar portions 2, 2... For inserting the heat transfer tubes of the fin plates 1, 1. In the case where a plurality of cut-and-raised portions 3a to 3f are provided as shown, the bridging of the drain water staying between them can be suppressed and discharged more effectively. become. Further, the drain water adhering to the upper part of the cut and raised portions 3a to 3f is also formed by the gaps 4a and 4a formed by the installation of the cuts 4, 4... 4, 4,. ... 4a, 4a... 4a, 4a.

  As a result of the above, according to the finned tube heat exchanger of this embodiment, the accumulated amount of drain water on the collar portions 2, 2... And the fin plates 1, 1. The air flow resistance and heat resistance are greatly reduced, and the effective heat exchange performance inherent to the finned tube heat exchanger can be sufficiently exhibited.

(Fourth embodiment)
Next, (C) of FIG. 4 has shown the structure and effect | action of the finned-tube heat exchanger which concerns on the 4th Embodiment of this invention.

  As is clear from the above description, for example, when a fin-fin type heat exchanger of plate fin type is used as an evaporator, drain water adheres and stays on the collar part or cut-and-raised part of the fin plate. Becomes a heat resistance, and also increases the ventilation resistance and lowers the heat exchange performance.

  Therefore, in this embodiment, as shown in FIG. 4C, for example, the notches 4, 4,..., 4, 4,. 1, 2, and 4 (b)), V-shaped notch grooves 5, 5,..., 5, 5,. .., 5, 5...

  According to such a configuration, the surface of the fin plate 1, 1... Made by installing the notches 5, 5, 5, 5, 5, 5. .., 5a, 5a... 5a, 5a... Function as a guide groove for drain water discharge, and the grooves 5a, 5a. .. 5a, 5a... In the case where water is effectively drawn in as shown in the right side of the figure and there is no drain water discharge guide groove in FIG. Since more water is accumulated than in the case of the cuts 4, 4... In FIG. 4B of the first, second, and third embodiments, the drain water flows downward. Will be promoted. Thereby, the increase in ventilation resistance by the drain water of a heat exchanger and the increase in thermal resistance are suppressed more effectively.

  As a result of the above, according to the finned tube heat exchanger of this embodiment, the accumulated amount of drain water on the collar portions 2, 2... And the fin plates 1, 1. This greatly reduces the ventilation resistance and heat resistance, and the effective heat exchange performance inherent in the finned tube heat exchanger can be fully exhibited.

(Fifth embodiment)
Next, (d) of FIG. 4 has shown the structure and effect | action of the finned-tube heat exchanger which concerns on the 5th Embodiment of this invention.

As is clear from the above description, for example, when a fin-fin type heat exchanger of plate fin type is used as an evaporator, drain water adheres to and stays on the collar part and the cut and raised part of the fin plate. Becomes a heat resistance, and also increases the ventilation resistance and lowers the heat exchange performance.

  Therefore, in this embodiment, for example, as shown in FIG. 4D, the cuts 4, 4... In the first, second, and third embodiments described above (see FIG. 4B). Instead of the collar portions 2, 2... For inserting the heat transfer tubes of the fin plates 1, 1. As discharge guide grooves, ribs 6, 6... That are deformed by projecting in a V-shaped cross section from one side of the fin plate 1 to the other side are provided.

  According to such a configuration, the ribs 6, 6,. A plurality of concave groove portions of the second and third concave groove portions 6b and 6c having a predetermined corner angle are formed on the other groove side of the concave groove portion 6a, and a drain groove guide groove comprising the plurality of concave groove portions 6a to 6c. As a result, as shown in the state on the right side of FIG. 4D, a large amount of drain water is effectively collected on both sides and flows out more smoothly downward.

  As a result, according to the finned tube heat exchanger of this embodiment, the collar portions 2, 2... For inserting heat transfer tubes and the fin plates 1, 1. The residence amount is greatly reduced, the ventilation resistance and the thermal resistance are reduced, and the effective heat exchange performance inherent in the finned tube heat exchanger can be sufficiently exhibited.

  In the above configuration, the protruding height S of the rib 6 is, for example, 0.3 mm or less as shown in FIG. 5, and the groove angle θ of the groove portion 6a having a V-shaped cross section is as shown in FIG. It is effective to be 150 ° or less.

(Sixth embodiment)
Next, (e) of FIG. 4 has shown the structure and effect | action of the finned-tube heat exchanger which concerns on the 6th Embodiment of this invention.

  As is clear from the above description, for example, when a fin-fin type heat exchanger of plate fin type is used as an evaporator, drain water adheres and stays on the collar part or cut-and-raised part of the fin plate. Becomes a heat resistance, and also increases the ventilation resistance and lowers the heat exchange performance.

  Therefore, in this embodiment, for example, as shown in FIG. 4E, the cuts 4, 4... In the first, second, and third embodiments described above (see FIG. 4B). Instead of the collar portions 2, 2... For inserting the heat transfer tubes of the fin plates 1, 1. As shown in FIG. 4D, the discharge guide groove is deformed so as to protrude from one side of the fin plate 1, 1... A rib 7 having a notch 7d opened between both side surfaces is provided at the center of the portion.

  According to such a configuration, the fin plates 1, 1... Are deformed into a V-shaped cross section from one surface side to the other surface side, and further, the both surface sides of the rib 7 having the notches 7d that open between both side surfaces in the center. In addition, a plurality of concave groove portions 7a to 7c similar to those in the sixth embodiment are formed, and a concave groove portion formed by a gap extending between both side surfaces of the fin plate portion is formed by a cut 7d at the center. Is done. And, as shown in the state on the right side of FIG. 4 (e), a larger amount of drain water is more effective due to the drain water discharge guide groove having a large total cross-sectional area composed of the four concave groove portions 7a to 7d. Are collected more smoothly and flow downwards more smoothly.

  As a result of the above, according to the finned tube heat exchanger of this embodiment, the accumulated amount of drain water on the collar portions 2, 2... And the fin plates 1, 1. The air flow resistance and heat resistance are greatly reduced, and the effective heat exchange performance inherent to the finned tube heat exchanger can be more fully exhibited.

(Seventh embodiment)
Furthermore, (f) of FIG. 4 has shown the structure and effect | action of the finned-tube heat exchanger which concerns on the 7th Embodiment of this invention.

As is clear from the above description, for example, when a fin-fin type heat exchanger of plate fin type is used as an evaporator, drain water adheres to and stays on the collar part and the cut and raised part of the fin plate. Becomes heat resistance, and also increases ventilation resistance and decreases heat exchange performance.

  Therefore, in this embodiment, for example, as shown in FIG. 4F, the cuts 4, 4... In the first, second, and third embodiments described above (see FIG. 4B). In place of the collar portions 2, 2... For inserting the heat transfer tubes of the fin plates 1, 1. The drain water guide groove is formed by a cut portion 8 that forms a stepped gap 8a between both side surfaces of 1, 1,.

  According to such a configuration, the concave groove portions 8b and 8c and the concave groove portions 8b and 8c are formed on both side surfaces of the cut portion 8 that forms a stepped gap 8a between both side surfaces of the fin plates 1, 1. As shown in the right state of FIG. 4 (f), a plurality of groove portions of the gap 8a are formed, and the drain water discharge guide groove having a large total cross-sectional area composed of the plurality of groove portions 8a to 8c The drain water is effectively collected and flows downward smoothly.

  As a result of the above, according to the finned tube heat exchanger of this embodiment, the accumulated amount of drain water on the collar portions 2, 2... And the fin plates 1, 1. The air flow resistance and heat resistance are greatly reduced, and the effective heat exchange performance inherent to the finned tube heat exchanger can be sufficiently exhibited.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway front view showing a configuration of a main part of a finned tube heat exchanger according to a first embodiment of the present invention. It is a partially notched front view which shows the structure of the principal part of the finned-tube type heat exchanger which concerns on Embodiment 2 of the best implementation of this invention. It is a partially notched front view which shows the structure of the principal part of the finned-tube heat exchanger which concerns on Embodiment 3 of the best practice of this invention. BEST MODE FOR CARRYING OUT THE INVENTION Structure and Action (b) of Drain Water Discharge Guide Groove by Incision Commonly Adopted in Fin Tube Type Heat Exchangers According to Best Modes 1 to 3 of the Present Invention 4-7, notch grooves (c), ribs (d), combinations of ribs and notches (e), and drain groove discharge guide grooves such as those with a notch structure (f). It is explanatory drawing which showed the structure and effect | action compared with the drain water discharge effect | action by the conventional structure (a), respectively up and down. It is a figure which shows the dimensional relationship of the rib in the structure of the finned-tube heat exchanger which concerns on Embodiment 5 of this invention best. It is a partially notched front view which shows the structure of the principal part of the conventional fin tube type heat exchanger. It is the side view seen from the left side direction of FIG.

Explanation of symbols

  1 is a fin plate, 2 is a collar portion for inserting a heat transfer tube, 3a to 3f are cut and raised portions, 4 is a cut, 5 is a notch, 6 is a rib, 7 is a rib having a cut, and 8 is a stepped structure. It is a notch.

Claims (9)

  A plurality of fin plates (1), (1)... Arranged in parallel at a predetermined interval, and a collar for inserting heat transfer tubes of the plurality of fin plates (1), (1). In the finned tube heat exchanger comprising a plurality of heat transfer tubes (10), (10), ... inserted into the parts (2), (2), ..., the fin plates (1), ( 1)... A fin tube type heat exchange characterized by providing drain water discharge guide grooves below the collar portions (2), (2). vessel.   2. The finned tube heat exchanger according to claim 1, wherein a plurality of drain water guide grooves extend in the vertical direction and are arranged in parallel from the upstream side to the downstream side of the air flow.   Between the collar portions (2), (2)... For inserting the heat transfer tubes of the fin plates (1), (1). The parts (3a) to (3f) are arranged in parallel, and the drain water discharge guide groove is provided between the plurality of raised parts (3a) to (3f). The finned tube heat exchanger according to claim 1 or 2, characterized in that   4. The finned tube heat exchanger according to claim 3, wherein a guide groove for drain water discharge extending in the vertical direction is also provided in the plurality of cut and raised portions (3a) to (3f).   The drain grooves for discharging drain water have notches (4), which form gaps (4a), (4a),... At predetermined intervals between both surfaces of the fin plates (1), (1),. The finned tube heat exchanger according to claim 1, 2, 3, or 4, characterized by being formed by (4).   A drain groove guide groove is formed by a notch groove (5) having a V-shaped cross section provided on one side of the fin plates (1), (1). A finned tube heat exchanger according to 1, 2, 3 or 4.   The drain water discharge guide groove is formed by a rib (6) deformed into a V-shaped cross section from one side of the fin plate (1), (1). The finned tube heat exchanger according to claim 1, 2, 3 or 4.   The drain water discharge guide groove is deformed into a V-shaped cross section from one side of the fin plates (1), (1)... To the other side, and further extends vertically in the center of the deformed portion (7d). 5. The finned tube heat exchanger according to claim 1, 2, 3 or 4, characterized in that it is formed by a rib (7) having).   The drain water discharge guide groove is formed by a notch (8) that forms a stepped gap (8a) between both surfaces of the fin plates (1), (1). The finned-tube heat exchanger according to claim 1, 2, 3, or 4.

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