WO2020209156A1

WO2020209156A1 - Heat exchanger

Info

Publication number: WO2020209156A1
Application number: PCT/JP2020/015015
Authority: WO
Inventors: 峻裕木村; 竹彦名坂
Original assignee: 矢崎エナジーシステム株式会社
Priority date: 2019-04-10
Filing date: 2020-04-01
Publication date: 2020-10-15
Also published as: JP2020173057A

Abstract

Provided is a heat exchanger such that a heat exchange surface can be wet widely while supplying a small amount of liquid to a glass plate.　The hydrophilic coating layer laminated on the glass plate (21) has uneven portions, and thus it is possible to widely wet the heat exchange surface even with a small amount of liquid, as compared with a configuration in which the coating layer is simply provided. Furthermore, by forming the uneven portions on the coating layer instead of the glass plate (21) itself, the influence on the glass plate (21) can be reduced, the degree of freedom in forming the uneven portions is increased, and the heat exchange surface can be easily wet widely.

Description

Heat exchanger

The present invention relates to a heat exchanger.

Conventionally, as a heat transfer tube incorporated in an absorption chiller, a tube having a spiral rib and a protrusion on the outer surface of the tube has been proposed (see, for example, Patent Document 1). In the heat transfer tube described in Patent Document 1, the ridgeline portion of the protrusion is shaped so as to project in the direction of the tube axis, thereby improving the wettability and spreading property of the liquid.

JP-A-11-294899

The heat exchanger may be installed, for example, in the window of a building. In the case of such a heat exchanger, the output of the heat exchanger tends to decrease due to the miniaturization of the heat exchanger according to the size of the window portion, and the amount of liquid used may decrease. Therefore, it has been desired to widely wet the entire heat exchange surface with a small amount of liquid. When the heat exchanger is installed in the opening (window) of the building, the heat exchange surface is formed of a glass plate for the purpose of daylighting, and the liquid is supplied to the glass plate. The ribs and protrusions as described in Patent Document 1 can be easily formed on a metal member, but are difficult to form on a glass plate. Further, in addition to the purpose of providing the opening, the heat exchange surface may be formed of a glass plate for other purposes such as improvement of design, and a small amount of liquid may be supplied. As described above, when supplying a small amount of liquid to the heat exchanger having the glass plate, it has been desired to widely wet the heat exchange surface.

An object of the present invention is to provide a heat exchanger capable of widely wetting a heat exchange surface while supplying a small amount of liquid to a glass plate.

The heat exchanger of the present invention comprises a glass plate constituting the heat exchange surface, a hydrophilic coating layer laminated on the surface of the glass plate on the side to which the liquid is supplied, and having uneven portions on the surface. It is characterized by having.

According to such a heat exchanger of the present invention, the hydrophilic coating layer laminated on the glass plate has uneven portions, so that even a small amount of liquid can be used as compared with a configuration in which the coating layer is simply provided. The heat exchange surface can be widely wetted. Further, by forming the uneven portion on the coating layer instead of the glass plate itself, the influence on the glass plate can be reduced, the degree of freedom in forming the uneven portion is high, and the heat exchange surface is easily wetted widely.

It is a schematic block diagram which shows typically the absorption chiller which concerns on embodiment of this invention. It is sectional drawing which shows the evaporator of Example 1 used for the absorption chiller. It is sectional drawing which shows the evaporator of Example 2 used for the absorption chiller. It is a perspective view which shows the evaporator of Example 3 used in the absorption chiller. It is a front view which shows the evaporator. It is a perspective view which shows the evaporator of Example 4 used in the absorption chiller. It is a front view which shows the evaporator of Example 5 used in the absorption chiller. It is sectional drawing which shows the said evaporator. It is a front view which shows the evaporator of Example 6 used for the absorption chiller. It is sectional drawing which shows the said evaporator. It is sectional drawing which shows the state which changed the shape of the evaporator of Example 6. It is sectional drawing which shows the state which changed the shape of the evaporator of Example 6. It is sectional drawing which shows the heat exchanger of the modification 1. It is sectional drawing which shows the heat exchanger of the modification 2. It is sectional drawing which shows the heat exchanger of Reference Example 1. FIG. It is sectional drawing which shows the heat exchanger of Reference Example 2. FIG. It is sectional drawing which shows the heat exchanger of Reference Example 3. FIG. It is sectional drawing which shows the heat exchanger of Reference Example 4. FIG. It is sectional drawing which shows the heat exchanger of Reference Example 5. FIG. It is sectional drawing which shows the heat exchanger of Reference Example 6.

As shown in FIG. 1, the absorption chiller 1 of the present embodiment includes an evaporator 2, an absorber 3, a regenerator 4, a condenser 5, and a solution heat exchanger 6. Of these, the evaporator 2 and the absorber 3 function as heat exchangers. In the absorption chiller 1 of the present embodiment, for example, water is used as a refrigerant and lithium bromide is used as an absorption liquid, but ammonia may be used as a refrigerant and water may be used as an absorption liquid, and the refrigerant and absorption may be used. The combination with the liquid may be appropriately selected according to the intended use and the like.

The evaporator 2 has a glass plate 21 extending in the vertical direction and is formed as a flat plate as a whole. The glass plate 21 may have a slight inclination with respect to the vertical direction. The evaporator 2 is arranged so as to face (parallel to each other) the glass plate 31 described later of the absorber 3, and the glass plate 31 side becomes the liquid supply surface 2A. That is, the liquid refrigerant L1 supplied from the condenser 5 is dropped onto the liquid supply surface 2A from the supply unit 20 arranged above the glass plate 21. By supplying the liquid refrigerant L1, the glass plate 21 constitutes the heat exchange surface of the evaporator 2.

The absorber 3 has a glass plate 31 extending in the vertical direction and is formed as a flat plate as a whole. The glass plate 31 may have a slight inclination with respect to the vertical direction. The glass plate 21 side of the absorber 3 is the liquid supply surface 3A. That is, the absorbing liquid (concentrated solution) L2 supplied from the regenerator 4 through the solution heat exchanger 6 is dropped onto the liquid supply surface 3A from the supply unit 30 arranged above the glass plate 31. Is supplied. By supplying the absorbing liquid L2, the glass plate 31 constitutes the heat exchange surface of the absorber 3.

The absorption chiller 1 has a housing 10 having a double glass structure composed of an evaporator 2 and an absorber 3 facing each other as described above. Further, an evaporation space S is formed between the evaporator 2 and the absorber 3. In order to prevent the

glass plates

21 and 31 from bending due to the pressure difference between the evaporation space S and the external space of the housing 10, a columnar connecting member for connecting the

glass plates

21 and 31 may be provided. ..

Further, in the present embodiment, the absorption chiller 1 is arranged indoors with respect to the window glass of the building, or is provided at the opening of the building to form the window portion. When the absorption chiller 1 is provided at or near the opening that communicates between the indoor and outdoor areas, the evaporator 2 shall be provided on the indoor side. Further, the absorption chiller 1 may be provided on the wall portion that partitions the space in the building.

In the absorption chiller 1, the liquid refrigerant L1 is supplied to the evaporator 2 and the absorption liquid L2 is supplied to the absorber 3. When the liquid refrigerant L1 is absorbed by the absorbing liquid L2 in the absorber 3, the evaporation space S is depressurized. As a result, the liquid refrigerant L1 adhering to the liquid supply surface 2A of the evaporator 2 evaporates by taking away heat from the surroundings, so that a cooling effect can be obtained. At this time, the wider the

liquid supply surfaces

2A and 3A are wetted by the supplied liquid, the higher the cooling effect (efficiency of the heat exchanger). Further, by providing the heat transfer means for the evaporator 2, the configuration may be such that heat exchange with the space to be cooled is easy.

The absorbent liquid (rare solution) L3 that has absorbed the liquid refrigerant is recovered by the recovery unit 7 arranged below the evaporator 2 and the absorber 3, passes through the solution heat exchanger 6, and is introduced into the regenerator 4. .. The dilute solution is heated in the regenerator 4 and separated into the vapor refrigerant G1 and the absorption liquid (concentrated solution) L2. The regenerator 4 may be provided with an appropriate heating means. For example, the regenerator 4 may be configured to send a heat medium heated by sunlight to the regenerator 4, or the regenerator 4 may be inserted into an opening of a building or the like. By arranging it and attaching a heat collecting panel, it may be directly heated by using sunlight. The vapor refrigerant G1 becomes the liquid refrigerant L1 when it is introduced into the condenser 5 and cooled. Further, the dilute solution L3 heading to the regenerator 4 and the absorbing liquid L2 heading from the regenerator 4 to the absorber 3 exchange heat in the solution heat exchanger 6. The liquid refrigerant L1 and the absorbing liquid L2 are introduced into the feeder 6, and the above cycle is repeated.

A specific example of the evaporator 2 as a heat exchanger will be described below. The absorber 3 as a heat exchanger may have the same configuration as the evaporator 2.

[Example 1]
As shown in FIG. 2, the evaporator 2 of this embodiment has a glass plate 21 and a hydrophilic coating layer 22 laminated on the glass plate 21. The coating layer 22 is laminated so as to constitute the entire liquid supply surface 2A.

A plurality of granular members 23 are embedded in the coating layer 22. By partially exposing the granular member 23, the uneven portion 221A is formed on the surface 221 of the coating layer 22. The granular member 23 does not reach the surface of the glass plate 21. The coating layer 22 is composed of a hydrophilic coating agent (for example, a water glass-based coating agent, a silicon-based coating agent, a silicon organic hybrid-based coating agent, a hydrophilic resin-based coating agent, or the like) capable of holding the granular member 23.

The granular member 23 is, for example, hydrophilic particles having a size of about 0.5 to 2 mm and preferably has a rough surface, and particles such as silica gel, glass fragments, silica gel, metal particles, and ceramics are exemplified. If the granular member 23 is of the same type as the coating agent (that is, has similar chemical properties), the adhesion to the coating layer 22 can be improved. Further, it is sufficient that about half of the granular member 23 is embedded in the coating layer 22, that is, the film thickness of the coating layer 22 may be the same as the diameter of the granular member 23.

The granular member 23 may be embedded in the coating layer 22 by applying the coating agent to the glass plate 21, spraying the granular member 23 before the coating agent is cured, and curing the coating agent to form the coating layer 22. .. By forming the uneven portion 221A on the surface 221 of the coating layer 22 in this way, the value of the surface roughness becomes large.

[Example 2]
As shown in FIG. 3, the evaporator 2 of this embodiment has a glass plate 21 and a coating layer 24 laminated on the glass plate 21. The coating layer 24 is laminated so as to constitute the entire liquid supply surface 2A.

Concavo-convex portion 241A is formed on the surface 241 of the coating layer 24. The surface 241 has a plurality of recesses 242 due to the coating agent being scraped off in dots, and the concave-convex portion 241A is formed by the plurality of recesses 242. The portion of the surface 241 where the recess 242 is not formed is formed flat. The recess 242 does not reach the surface of the glass plate 21. The coating layer 24 is composed of the same coating agent as in Example 1.

A coating agent is applied to the glass plate 21, the coating agent is cured, and then rough surface processing is performed by sandblasting to form recesses 242. By forming the uneven portion 241A on the surface 241 of the coating layer 24 in this way, the value of the surface roughness becomes large. The rough surface processing method for forming the concave portion 242 may be wedge blasting or laser processing. Further, the concave portion formed in the coating layer is not limited to a dot shape, and may be linear or may have a zigzag pattern or the like. Further, when forming a recess other than a dot shape, a groove may be formed by scraping the coating layer with a grindstone, a milling cutter or the like.

[Example 3]
In this embodiment, as shown in FIGS. 4 and 5, a rod-shaped member 25 is further provided with respect to the evaporator 2 of the first embodiment. Although FIG. 4 shows only a part of the granular member 23, it is assumed that the granular member 23 is provided on the entire surface 221.

The rod-shaped member 25 is embedded in the coating layer 22 and partially exposed from the surface 221. The rod-shaped member 25 does not reach the surface of the glass plate 21. The rod-shaped member 25 may be, for example, a glass rod having a diameter of about 2 to 5 mm. If the rod-shaped member 25 is of the same type as the coating agent (that is, has similar chemical properties), the adhesion to the coating layer 22 can be improved.

The horizontal guide portion is configured by arranging the rod-shaped member 25 so as to extend along the horizontal direction. In this embodiment, a plurality of rod-shaped members 25 are arranged in the horizontal direction at intervals to form rows L1 of horizontal guide portions, and rows L2 to L4 are also formed below the rows L1. In adjacent rows, the rod-shaped members 25 are staggered. For example, the rod-shaped members 25 in the row L2 are arranged below the distance between the rod-shaped members 25 in the row L1, and the rod-shaped members 25 in the row L1 are arranged above the distance between the rod-shaped members 25 in the row L2. ..

When the liquid refrigerant is supplied from above to the liquid supply surface 2A of the evaporator 2, the liquid refrigerant descends along the surface 221 of the coating layer 22. The liquid refrigerant that has reached the rod-shaped member 25 flows along the horizontal direction along the rod-shaped member 25. That is, the horizontal guide portion composed of the rod-shaped member 25 guides the liquid refrigerant so as to flow along the horizontal direction.

The liquid refrigerant that has reached the end of the rod-shaped member 25 passes through the gap between the rod-shaped members 25 that are adjacent to each other in the horizontal direction and descends. Since the rod-shaped members 25 in the lower row are arranged below the gap between the rod-shaped members 25 in a certain row, the lowered liquid refrigerant reaches the rod-shaped members 25 in the lower row. By repeating the above, the liquid refrigerant is guided in the horizontal direction while descending, and the liquid film spreads on the surface 221.

[Example 4]
In this embodiment, as shown in FIG. 6, a rod-shaped member 25 is further provided with respect to the evaporator 2 of the second embodiment. Although FIG. 6 shows only a part of the recesses 242, it is assumed that the recesses 242 are formed on the entire surface 241. The size, material, arrangement, etc. of the rod-shaped member 25 are the same as those in the third embodiment.

[Example 5]
In the evaporator 2 of this embodiment, as shown in FIGS. 7 and 8, a patterned coating layer 26 is formed on the surface of the glass plate 21. On the surface of the coating layer 26, uneven portions may be formed by granular members as in Example 1, or uneven portions may be formed by concave portions as in Example 2. Further, the material of the coating layer 26 may be the same as that of the first embodiment.

The coating layer 26 is composed of a plurality of rows 261 to 266 extending in the horizontal direction, and the coating layer is not formed between the rows to form untreated portions 211 to 215 where the surface of the glass plate 21 is exposed. ing. The untreated portions 211 to 215 are concave with respect to the coating layer 26. By applying the coating agent while covering the portions corresponding to the untreated portions 211 to 215 with the masking member, the coating layer 26 patterned as described above may be formed.

The liquid refrigerant supplied to the liquid supply surface 2A of the evaporator 2 descends while being transmitted in the horizontal direction in each of the rows 261 to 266 and the untreated portions 211 to 215. That is, since the rows 261 to 266 are subjected to the hydrophilic treatment, it is easy to hold the liquid refrigerant, and the liquid refrigerant flows along the horizontal direction which is the extending direction of the rows. On the other hand, since the untreated portions 211 to 215 are concave grooves with respect to the rows 261 to 266, the liquid refrigerant flows along the horizontal direction which is the extending direction due to the capillary phenomenon.

In this embodiment, a predetermined pattern is formed by providing a coating agent only on a part of the surface of the glass plate, but the coating agent is provided on the entire surface of the glass plate and the cured coating agent is partially applied. A predetermined pattern may be formed by scraping off the glass. For example, the groove portion may be formed by scraping the positions corresponding to the untreated portions 211 to 215 by sandblasting or mechanical cutting.

[Example 6]
As shown in FIGS. 9 and 10, the evaporator 2 of this embodiment is further provided with a hydrophobic coating layer 27 as compared with Example 5. The hydrophobic coating layer 27 is formed between adjacent rows 261 to 266 (that is, positions corresponding to the untreated portions 211 to 215) and has rows 271 to 275.

The liquid refrigerant supplied to the liquid supply surface 2A of the evaporator 2 descends while being transmitted in the horizontal direction in rows 261 to 266. At this time, unlike the untreated portions 211 to 215, the hydrophobic coating layer 27 is easily repelled by the liquid refrigerant, and the liquid refrigerant is suppressed from falling in the hydrophobic coating layer 27. Therefore, the liquid refrigerant whose lowering is suppressed stays in the hydrophilic coating layer 26 and easily spreads in the horizontal direction.

The rows 271 to 275 of the hydrophobic coating layer 27 may be formed with vertical guide portions through which the liquid refrigerant can easily flow along the vertical direction. For example, as shown in FIG. 11, rows 271 to 274 may be interrupted, and a hydrophilic coating agent may be provided between them. The rows 271 to 274 are arranged in the same manner as the rod-shaped member 25 of the third embodiment, and the row 272 is left so as to correspond to the lower part of the portion where the row 271 is interrupted. Row 271 is left to correspond upwards.

Further, by arranging the interrupted portions of the rows 271 to 275 alternately on the left and right, the liquid refrigerant may flow so as to reciprocate from side to side. For example, if the right end of row 271 is interrupted to provide a hydrophilic coating agent and the left end of row 272 is interrupted to provide a hydrophilic coating, the liquid refrigerant is in row 271. After flowing to the right, it flows to the left in column 272.

Further, the row of the coating layer 26 and the row of the hydrophobic coating layer 27 may have an inclination with respect to the horizontal direction. For example, as shown in FIG. 12, when there is a region A1 on the glass plate 2 in which it is desired to avoid the passage of the liquid refrigerant, the rows of the coating layer 26 and the hydrophobic coating layer 27 are inclined so as to avoid this region A1. You may.

According to this embodiment, there are the following effects. That is, since the hydrophilic coating layer laminated on the glass plate 21 has uneven portions, the heat exchange surface can be widely wetted even with a small amount of liquid, as compared with a configuration in which the coating layer is simply provided.

Further, by forming the uneven portion on the coating layer instead of the glass plate 21 itself, the influence on the glass plate 21 can be reduced, the degree of freedom in forming the uneven portion is high, and the heat exchange surface is widely wetted. Cheap. Further, it is easy to secure the strength of the glass plate 21, and it is possible to prevent the glass plate 21 from being damaged when the evaporation space S is depressurized.

Further, by providing the horizontal guide portion in the coating layer as in Examples 3 to 6, the entire coating layer can be widely wetted even with a small amount of liquid. That is, by forming the uneven portion, the effect of wetting a relatively narrow range can be obtained, and by providing the horizontal guide portion, the effect of moving the liquid in a relatively wide range can be obtained.

In particular, when the liquid is supplied from above to the glass plate 21 along the vertical direction, the liquid descends due to gravity, so that it is unlikely to move in the horizontal direction. By providing a horizontal guide portion to guide the liquid in the horizontal direction, the heat exchange surface can be widely wetted even when the liquid supply location is fixed or small.

The present invention is not limited to the above embodiment, but includes other configurations and the like that can achieve the object of the present invention, and the following modifications and the like are also included in the present invention.

For example, in the above-described embodiment, in the absorption chiller 1, the coating layer 22 is laminated on the glass plate 21 of the evaporator 2 as a heat exchanger to form the uneven portion 221A. When the regenerator 4 is provided with a housing having a double glass structure, a coating layer may be laminated on a glass plate constituting one side surface of the housing to form an uneven portion. Further, the condenser 5 and the heat exchanger 6 may include a housing having a double glass structure.

Further, in the above-described embodiment, it is assumed that the evaporator 2 and the absorber 3 face each other to form the housing 10, but the configuration is not limited to this. For example, a predetermined region of one glass plate may be used as an evaporator and another region may be used as an absorber. In addition, a housing composed of two glass plates each functioning as an evaporator and a housing composed of two glass plates both functioning as an absorber are prepared, and these housings are prepared. The body may be connected by a passage through which the fluid can pass. In such a configuration in which the evaporator and the absorber do not face each other, it is possible to suppress a decrease in the cooling effect due to the heat generated in the absorber being transferred to the evaporator.

Further, in the above embodiment, the housing 10 provided with the evaporator 2 and the absorber 3 is provided with the evaporator 2 facing the indoor side, but the absorber 3 may be directed toward the indoor side. Further, a housing composed of a condenser or a regenerator may be arranged in an opening of the building. When a device that generates heat, such as an absorber or a condenser, is arranged so as to face the indoor side, it is preferable to provide a heat exhausting means for transferring heat to the outside. The heat exhausting means may be a water-cooled type or an air-cooled type.

Further, the heat exchanger may be a device that does not involve decompression, such as a vaporization cooler. When the glass strength is not required easily, or when the glass strength can be secured by appropriately selecting the material and the like, the glass plate is described as described in Modifications 1 and 2 and Reference Examples 1 to 6 below. The unevenness may be formed on itself.

[Modification 1]
As shown in FIG. 13, the heat exchanger of this modification includes a glass plate 8A and a coating layer 28. The glass plate 8A is formed with a plurality of recesses 81 extending along the horizontal direction. The recess 81 may be formed by, for example, machining such as cutting, pressing a mold, or chemical etching. The coating layer 28 is laminated only on the concave portions 81, and is not laminated on the convex portions 82 between the concave portions 81. Further, the coating layer 28 is embedded with the same granular member 23 as in the first embodiment to form an uneven portion. As in the second embodiment, the coating layer may have a plurality of concave portions on the surface to form uneven portions. Further, the convex portion 82 may be laminated with a hydrophobic coating layer as in Example 6.

[Modification 2]
As shown in FIG. 14, the heat exchanger of this modification includes a glass plate 8B and a coating layer 28. A plurality of convex portions 83 extending in the horizontal direction are provided on the surface of the glass plate 8B by glass frit printing, and concave portions 81 are formed between adjacent convex portions 83. Similar to the first modification, the concave portion 81 is laminated with a coating layer 28 to form an uneven portion.

In the modified examples 1 and 2, it is assumed that the

convex portions

81 and 83 have a tapered shape (a shape in which the vertical dimension decreases toward the tip side), but the convex portions of the reference example described later It may have such a shape.

[Reference Examples 1 to 6]
The heat exchangers of Reference Examples 1 to 6 include a glass plate forming a heat exchange surface, and a concave groove portion extending in a horizontal direction is formed on the surface of the glass plate. According to such a heat exchanger, the liquid can be guided along the horizontal direction, and the liquid can be widely wetted and spread on the glass plate. At this time, the glass plate may or may not have a hydrophilic coating layer formed. Further, when the hydrophilic coating layer is formed on the glass plate, the uneven portion may or may not be formed as in Examples 1 to 6 and Modifications 1 and 2.

Alternatively, a hydrophilic coating layer may be laminated on the concave groove portion of the glass plate, and a hydrophobic coating layer may be laminated on the tops of the convex wall portions on both sides of the concave groove portion. According to such a configuration, the hydrophilic coating layer holds the liquid in the concave groove portion, and the hydrophobic coating layer can prevent the liquid from flowing out from the concave groove portion.

Further, the height of the convex wall portion (depth of the concave groove portion) is preferably 1 mm or more, and more preferably 3 mm or more. Further, the height of the convex wall portion is preferably 5 mm or less. If the convex wall portion is too low, the liquid tends to flow out from the concave groove portion. On the other hand, the higher the convex wall portion, the easier it is to hold the liquid in the concave groove portion, but the thicker the liquid film in the concave groove portion. If the liquid film is too thick, the heat transfer property may decrease during heat exchange. Further, if the convex wall portion is too high, the strength may be lowered, and it may be difficult to form the convex wall portion, which may increase the cost.

Further, the width of the convex wall portion is preferably narrow so as not to impair the strength, and is preferably narrower than the width of the concave groove portion, for example. The narrower the width of the convex wall portion, the larger the area where the liquid film can be formed, and the larger the heat transfer area is likely to be.

Further, the width of the concave groove portion may be, for example, 30 to 50 mm (60 to 100 times the width of the convex wall portion) or 1 to 5 mm (2 to 10 times the width of the convex wall portion). When a hydrophilic coating layer is laminated in the concave groove portion and the uneven portion as in Examples 1 to 6 and Modifications 1 and 2 is formed, and the liquid easily wets and spreads in the concave groove portion. Can increase the area of the liquid film by widening the width of the concave groove portion. On the other hand, when the liquid is difficult to get wet and spread in the concave groove portion, narrowing the width of the concave groove portion makes it easier to hold the liquid and makes it easier to form a liquid film in the entire concave groove portion.

The concave groove portion and the convex wall portion may be formed by machining as in Example 7, or may be formed by glass frit printing as in Example 8.

The heat exchangers of Reference Example 1 shown in FIG. 15 and Reference Example 2 shown in FIG. 16 include a glass plate 8C in which the convex wall portion 84 protrudes from the surface. The heat exchanger of Reference Example 1 has a wider distance between the convex wall portions 84 than the heat exchanger of Reference Example 2, that is, the width of the concave groove portion 84A is wider.

In the heat exchanger of Reference Example 3 shown in FIG. 17, a convex wall portion 85 is formed on the surface of the glass plate 8D, and a chamfered portion 85B is formed at the boundary portion between the convex wall portion 85 and the concave groove portion 85A. That is, the side surface of the convex wall portion 85 rises smoothly and continuously with the bottom surface of the concave groove portion 85A. Further, a corner portion 85C is formed between the side surface of the convex wall portion 85 and the tip end surface. By forming the chamfered portion 85B, the strength can be ensured when the convex wall portion 85 is formed by machining. Further, by forming the corner portion 85C, it is possible to make it difficult for the liquid to get over the convex wall portion 85.

In the heat exchanger of Reference Example 4 shown in FIG. 18, a columnar convex wall portion 86 extending in the horizontal direction is formed on the surface of the glass plate 8E. Further, in the heat exchanger of Reference Example 5 shown in FIG. 19, a convex wall portion 87 having a width wider than that of the convex wall portions 84 of Reference Examples 1 and 2 is formed on the surface of the glass plate 8F. The convex wall portion 87 is formed in a square cross section. Further, in the heat exchanger of Reference Example 6 shown in FIG. 20, a tapered convex wall portion 88 is formed on the surface of the glass plate 8G. The convex wall portion 88 has a vertex 88A and is formed in a triangular cross section.

Further, in the first embodiment of the above embodiment, it is assumed that the granular member 23 does not reach the surface of the glass plate 21, but the granular member may reach the surface of the glass plate 21. At this time, it is preferable that the granular member is in contact with the surface of the glass plate and does not bite into the glass plate. The granular member may bite into the glass plate to the extent that the strength of the glass plate is not reduced.

Other, the best configuration, method, etc. for carrying out the present invention are disclosed in the above description, but the present invention is not limited thereto. That is, the present invention is particularly illustrated and described primarily with respect to a particular embodiment, but without departing from the scope of the technical idea and purpose of the present invention, the shape relative to the embodiments described above. , Materials, quantities, and other detailed configurations can be modified by those skilled in the art. Therefore, the description limiting the shapes, materials, etc. disclosed above is merely an example for facilitating the understanding of the present invention, and does not limit the present invention. Therefore, those shapes, materials, etc. The description by the name of the member which removes a part or all of the limitation such as is included in the present invention.

2 Evaporator (heat exchanger)
21

Glass plate

22, 24, 26

Coating layer

221, 241

Surface

221A, 241A Concavo-convex part 23 Granular member 242 Concave part 25 Rod-shaped member (horizontal guide part)
2A liquid supply surface

Claims

The glass plate that constitutes the heat exchange surface and
A heat exchanger characterized in that it is laminated on the surface of the glass plate on the side to which a liquid is supplied, and is provided with a hydrophilic coating layer having uneven portions on the surface.
The heat exchanger according to claim 1, wherein the uneven portion is formed by embedding a plurality of granular members in the coating layer.
The heat exchanger according to claim 1, wherein the uneven portion is formed by having a plurality of concave portions on the surface of the coating layer.
The glass plate is arranged along the vertical direction.
The heat exchanger according to any one of claims 1 to 3, wherein the coating layer has a horizontal guide portion that guides the liquid to flow along the horizontal direction.