Plate heat exchanger

Abstract

A plate heat exchanger is disclosed. The plate heat exchanger of the present invention includes a first plate provided with a corrugated first heat conducting surface for a first fluid to flow, a second plate provided with a corrugated second heat conducting surface for a second fluid to flow, the second plate and the first plate being stacked with each other, and a rib provided to a portion of the first heat conducting surface, the corrugated first heat conducting surface alternately forming a crest and a trough, the rib protruding from the trough of the first heat conducting surface toward the crest and contacting the second plate.

Description

TECHNICAL FIELD

[0001] The present invention relates to a plate-type heat exchanger. In particular, the present invention relates to a plate-type heat exchanger capable of improving heat transfer performance by reducing a flow cross-sectional area of a refrigerant. BACKGROUND

[0002] Generally, an air conditioner refers to a device for cooling and heating an indoor space through compression, condensation, expansion, and evaporation of a refrigerant. When the indoor space is heated, an indoor heat exchanger provided in an indoor unit functions as a condenser through which a high-temperature, high-pressure refrigerant passes, and an outdoor heat exchanger provided in an outdoor unit functions as an evaporator through which a low-temperature, low-pressure refrigerant passes. Conversely, when the indoor space is cooled, the indoor heat exchanger functions as an evaporator, and the outdoor heat exchanger functions as a condenser.

[0003] Such a heat exchanger is provided as a plate-type heat exchanger, and can effectively achieve heat transfer between fluids (i.e., water and a refrigerant) that are different from each other. For example, in Korean Patent Publication No. 10-2008-0006122, a structure capable of effectively achieving heat exchange in a flow path formed between a plurality of heat-conductive plates is disclosed.

[0004] However, the reality is that research and development are needed for a structure capable of more effectively improving heat transfer performance by adjusting a flow cross-sectional area of a fluid flowing in a plate-type heat exchanger. SUMMARY

[0005] Problems to be Solved by the Invention

[0006] An object of the present invention is to solve the foregoing problems and other problems.

[0007] Another object can be to provide a plate-type heat exchanger capable of improving heat transfer performance by reducing a flow cross-sectional area of a refrigerant.

[0008] Another object can be to provide a plate-type heat exchanger capable of blocking or guiding the flow of a refrigerant by providing ribs on a plate.

[0009] Another object can be to provide a plate-type heat exchanger capable of simplifying a manufacturing process by forming ribs while implementing a wavy shape on a plate.

[0010] Technical Solution to Solve the Problems

[0011] According to an aspect of the present application to achieve the above object, there is provided a plate-shaped heat exchanger including: a first plate provided with a corrugated first heat conducting surface through which a first fluid flows; a second plate provided with a corrugated second heat conducting surface through which a second fluid flows, the second plate being stacked with the first plate; and a rib provided to a portion of the first heat conducting surface, the corrugated first heat conducting surface alternately forming a ridge and a groove, the rib extending from the groove of the first heat conducting surface toward the ridge and being in contact with the second plate.

[0012] Effects of Invention

[0013] Effects of the plate-shaped heat exchanger of the present application are as follows.

[0014] According to at least one of the embodiments of the present application, it is possible to provide a plate-shaped heat exchanger capable of improving heat transfer performance by reducing a flow cross-sectional area of a refrigerant.

[0015] According to at least one of the embodiments of the present application, it is possible to provide a plate-shaped heat exchanger capable of blocking or guiding a flow of a refrigerant by providing a rib to a plate.

[0016] According to at least one of the embodiments of the present application, it is possible to provide a plate-shaped heat exchanger capable of simplifying a manufacturing process by forming a rib while implementing a corrugated shape on a plate.

[0017] The scope of applicability of the present application can be understood by the following detailed description together with the appended claims. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the application, are given by way of illustration only, since various changes and modifications within the scope of the application will become apparent to those skilled in the art from this detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a perspective view of a plate-shaped heat exchanger according to an embodiment of the present application.

[0019] Figure 2 is a front view of a first plate according to an embodiment of the present application.

[0020] Figure 3 is a view enlarged to show a rib provided to a first plate according to an embodiment of the present application.

[0021] Figure 4 is a rear view of Figure 3 .

[0022] Figure 5 is a graph for explaining an increase in heat exchange efficiency of a plate-shaped heat exchanger according to an embodiment of the present application.

[0023] Figures 6 to 9are drawings showing various examples of the shape and arrangement of the ribs of the embodiment of the present application. DETAILED DESCRIPTION

[0024] Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the drawings, and the same or similar constituent elements are designated by the same reference numerals regardless of the drawings, and repetitive explanations will be omitted.

[0025] The suffixes "module" and "part" used in the following description are assigned or mixed only in consideration of convenience for writing the specification, and do not have meanings or roles that distinguish each other by themselves.

[0026] In addition, in describing the embodiments disclosed in the present specification, if it is judged that a detailed description of the related known technology can confuse the gist of the embodiments disclosed in the present specification, a detailed description thereof will be omitted. In addition, the drawings are used only to help understanding of the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the drawings, and it should be understood that all modifications, equivalents, and alternatives within the idea and technical scope of the present specification are included.

[0027] The terms including ordinal numbers such as "first," "second," etc. can be used to describe various elements, but the elements are not limited by the terms. The terms are used only for the purpose of distinguishing one element from other elements.

[0028] If it is mentioned that a certain element is "connected" or "coupled" to another element, it should be understood that it can be directly connected or coupled to the other element, but there can be other elements therebetween. Conversely, if it is mentioned that a certain element is "directly connected" or "directly coupled" to another element, it should be understood that there are no other elements therebetween.

[0029] The singular expression includes the plural expression unless the context clearly indicates otherwise.

[0030] In the following description, although the embodiments are described with reference to specific drawings, the reference numerals not shown in the specific drawings can be mentioned as needed, and the reference numerals not shown in the specific drawings are used when the reference numerals appear in the other figures.

[0031] Reference Figure 1 The plate-shaped heat exchanger 1 includes a plurality of plates 10, 20 stacked with each other.

[0032] In the plate heat exchanger 1, a direction in which the plurality of plates 10, 20 are stacked on each other can be referred to as a front-rear direction FR. In addition, the plurality of plates 10, 20 can extend long in an up-down direction UD. A left-right direction LR can be a direction perpendicular to the front-rear direction FR and the up-down direction UD. On the other hand, for the sake of convenience in explanation, a case in which the length of the up-down direction UD of the plate heat exchanger 1 is greater than the length of the left-right direction LR is illustrated and explained, but the length of the up-down direction UD of the plate heat exchanger 1 can be substantially the same as the length of the left-right direction LR or less than the length of the left-right direction LR. In addition, a case in which the plurality of plates 10, 20 of the plate heat exchanger 1 are composed of three is illustrated, but the number of the plurality of plates 10, 20 is not limited.

[0033] The first end plate 50 can cover the front of the plate located at the most front among the plurality of plates 10, 20. At this time, a flow path for fluid to flow can be formed between the first end plate 50 and the plate located at the most front. The second end plate 30 can cover the rear of the plate located at the most rear among the plurality of plates 10, 20. At this time, a flow path for fluid to flow can be formed between the second end plate 30 and the plate located at the most rear. In addition, the second end plate 30 can block fluid from flowing to the rear thereof.

[0034] The front cover 60 can be coupled to the first end plate 50 and cover the front of the first end plate 50. The rear cover 40 can be coupled to the second end plate 30 and cover the rear of the second end plate 30.

[0035] Ports through which the first fluid R and the second fluid W flow in or out can be formed in the front cover 60, the first end plate 50, and the plurality of plates 10, 20, respectively. Here, the ports can be referred to as holes.

[0036] For example, the second fluid W can flow in through the inflow port 61 of the front cover 60 and flow in the first flow path connecting the inflow port 51 of the first end plate 50 and the inflow ports 11, 21 of the plurality of plates 10, 20. Also, a part of the second fluid W flowing in the first flow path can flow to the lower side along the heat conduction surface (not marked with a reference numeral) of a part of the plurality of plates 10, 20. In addition, the second fluid W flowing in the first flow path and / or the heat conduction surface can converge in the second flow path and be discharged to the outside through the discharge port 62 of the front cover 60. Here, the second flow path can connect the discharge ports 12, 22 of the plurality of plates 10, 20 and the discharge port 52 of the first end plate 50. On the other hand, the second fluid W can be water.

[0037] For example, the first fluid R can flow into through the inflow port 63 of the front cover 60 and flow in the third flow path connecting the inflow port 53 of the first end plate 50 and the inflow ports 13, 23 of the plurality of plates 10, 20. Also, a part of the first fluid R flowing in the third flow path can flow toward the upper side along the heat conducting surface (not designated by a reference numeral) of a part of the plurality of plates 10, 20. In addition, the first fluid R flowing in the third flow path and / or the heat conducting surface can converge in a fourth flow path and be discharged to the outside through the discharge port 64 of the front cover 60. Here, the fourth flow path can connect the discharge ports 14, 24 of the plurality of plates 10, 20 and the discharge port 54 of the first end plate 50. On the other hand, the first fluid R can be a refrigerant. For example, the first fluid R can be R410A or R32.

[0038] Referring to Figure 1 and Figure 2 , the plurality of plates 10, 20 can include a first plate 10 and a second plate 20 stacked on each other in the front-rear direction FR. At this time, the first plate 10 can include a first heat conducting surface 110 for the first fluid R to flow. In addition, the second plate 20 can include a second heat conducting surface 210 for the second fluid W to flow.

[0039] The first heat conducting surface 110 of the first plate 10 can be a wave shape in which ridges 111 and grooves 112 are alternately formed. For example, when viewed from the front, the wave of the first heat conducting surface 110 can be formed in a letter V shape or an inverted-V shape. Such a shape of the first heat conducting surface 110 can be referred to as a chevron shape. In addition, the foregoing description of the first plate 10 can be equally applied to the second plate 20.

[0040] Accordingly, the heat transfer area of the first fluid R flowing in the first heat conducting surface 110 increases, the heat transfer area of the second fluid W flowing in the second heat conducting surface 210 increases, and thus the heat transfer performance between the two can be improved.

[0041] For example, the first plate 10 and the second plate 20 can be made of a metal material having excellent thermal conductivity and pressure resistance. For example, the first plate 10 and the second plate 20 can include a stainless steel material.

[0042] Referring to Figure 2 and Figure 3 , the plate-shaped heat exchanger 1 can include a rib 120 provided to a part of the first heat conducting surface 110. At this time, the rib 120 can protrude from the groove 112 of the first heat conducting surface 110 toward the ridge 111 and contact the second plate 20 adjacent thereto.

[0043] Thus, the ribs 120 can block the flow of the first fluid R on the first heat conducting surface 110, so that the flow cross-sectional area of the first fluid R is reduced, thereby enabling the flow rate of the first fluid R to be increased. That is, in consideration of the characteristics of heat convection, the heat transfer performance between the first fluid R and the second fluid W can be correspondingly improved as the flow rate of the first fluid R rises. In addition, the ribs 120 can also guide the flow of the first fluid R on the first heat conducting surface 110.

[0044] Referring to Figure 3 and Figure 4 , the ribs 120 can be formed together with the wave crests 111 when the first plate 10 is punched. That is, by forming the ribs 120 at the same time as forming the first heat conducting surface 110 in a wavy shape on the first plate 10, it is possible to simplify the manufacturing process.

[0045] At this time, since the ribs 120 have a shape protruding toward the front from the front surface of the first plate 10 and a shape recessed toward the front from the back surface of the first plate 10, it is possible to maintain the flow cross-sectional area of the second fluid W flowing in the second plate 20 as it is, regardless of the presence or absence of the ribs 120.

[0046] Referring to Figure 5 , the optimal point of heat exchange efficiency corresponding to the rise in the flow rate of water can be different from the optimal point of heat exchange efficiency corresponding to the rise in the flow rate of refrigerant.

[0047] That is, as the flow cross-sectional area decreases, the flow rate of the fluid rises, so that the convective heat transfer coefficient increases, but the pressure loss of the fluid increases, and in terms of heat exchange efficiency, it is necessary to trade off between the convective heat transfer coefficient and the pressure loss of the fluid. In addition, depending on the type of fluid, such characteristics can vary.

[0048] As shown in the graph, it can be confirmed that, in terms of the optimal point of heat exchange efficiency corresponding to the rise in the flow rate, the refrigerant is relatively high compared to water. Therefore, it is preferable that the flow cross-sectional area of the first fluid R corresponding to the refrigerant be reduced by the ribs 120 provided to the first heat conducting surface 110, to increase the flow rate and improve the heat exchange efficiency.

[0049] Referring to Figure 6 , the first heat conducting surface 110 can extend long in the up-down direction UD, and the wave crests 111 and the wave troughs 112 of the first heat conducting surface 110 can extend long in a direction intersecting the up-down direction UD. Also, the first heat conducting surface 110 can be formed symmetrically in the left-right direction LR with a virtual boundary Bo extending in the up-down direction UD as a reference. That is, the wavy shape of the first heat conducting surface 110 can be bilaterally symmetrical with the boundary Bo as a reference.

[0050] The ribs 120 can include a plurality of ribs 121, 122, 123 spaced apart from each other in the up-down direction UD. The plurality of ribs 121, 122, 123 can include a first rib 121, a second rib 122, and a third rib 123. It is noted that the number of the plurality of ribs 121, 122, 123 is not limited thereto.

[0051] The first rib 121 can be adjacent to the right side edge Er of the first heat conducting surface 110. The first rib 121 can extend long in the left-right direction LR. One end of the first rib 121 can be located at the right side edge Er of the first heat conducting surface 110, and the other end thereof can be located at the boundary Bo.

[0052] The second rib 122 can be adjacent to the left side edge El of the first heat conducting surface 110. The second rib 122 can extend long in the left-right direction LR. One end of the second rib 122 can be located at the left side edge El of the first heat conducting surface 110, and the other end thereof can be located at the boundary Bo.

[0053] The third rib 123 can be adjacent to the right side edge Er of the first heat conducting surface 110. The third rib 123 can extend long in the left-right direction LR. One end of the third rib 123 can be located at the right side edge Er of the first heat conducting surface 110, and the other end thereof can be located at the boundary Bo.

[0054] Thus, the flow R1 of the first fluid R on the first heat conducting surface 110 can bypass the first rib 121, the second rib 122, and the third rib 123 from the inflow port 13 to the outflow port 14.

[0055] Referring to Figure 7 The first rib 121', the second rib 122', and the third rib 123' can extend long in the left-right direction LR and be spaced apart from the edges of the first heat conducting surface 110 by a distance.

[0056] One end of the first rib 121' can be spaced apart from the right side edge Er of the first heat conducting surface 110 by a first distance d1, and the other end thereof can be located at the boundary Bo. One end of the second rib 122' can be spaced apart from the left side edge El of the first heat conducting surface 110 by a second distance d2, and the other end thereof can be located at the boundary Bo. One end of the third rib 123' can be spaced apart from the right side edge Er of the first heat conducting surface 110 by a third distance d3, and the other end thereof can be located at the boundary Bo. For example, the first distance d1, the second distance d2, and the third distance d3 can be the same as each other.

[0057] Thus, the flow R2 of the first fluid R on the first heat conducting surface 110 can bypass the first rib 121', the second rib 122', and the third rib 123' from the inflow port 13 to the outflow port 14.

[0058] At this time, the flow R2 of the first fluid R can be divided into a first flow R21 and a second flow R22. The first flow R21 can cross the boundary Bo. The second flow R22 can be formed between one end of each of the first rib 121', the second rib 122', and the third rib 123' and the edge of the first heat conducting surface 110 adjacent thereto. That is, the second flow R22 formed along the edge of the first heat conducting surface 110 can prevent flow stagnation by generating eddy currents in the flow R2 of the first fluid R.

[0059] Referring to Figure 8 The first rib 121" can include a plurality of first ribs 121" each extending long in the left-right direction LR and spaced apart from each other in the left-right direction LR. The second rib 122" can include a plurality of second ribs 122" each extending long in the left-right direction LR and spaced apart from each other in the left-right direction LR. The third rib 123" can include a plurality of third ribs 123" each extending long in the left-right direction LR and spaced apart from each other in the left-right direction LR.

[0060] The plurality of first ribs 121" and the right side edge Er of the first heat conducting surface 110 can be spaced apart from each other by a fourth distance d4. The plurality of second ribs 122" and the left side edge El of the first heat conducting surface 110 can be spaced apart from each other by a fifth distance d5. The plurality of third ribs 123" and the right side edge Er of the first heat conducting surface 110 can be spaced apart from each other by a sixth distance d6. For example, the fourth distance d4, the fifth distance d5, and the sixth distance d6 can be the same as each other.

[0061] Accordingly, the flow R3 of the first fluid R on the first heat conducting surface 110 can flow from the inflow port 13 to the discharge port 14, bypassing the plurality of first ribs 121", the plurality of second ribs 122", and the plurality of third ribs 123".

[0062] At this time, the flow R3 of the first fluid R can be divided into a first flow R31, a second flow R32, and a third flow R33. The first flow R31 can cross the boundary Bo. The second flow R32 can be formed between one end of each of the first rib 121", the second rib 122", and the third rib 123" and the edge of the first heat conducting surface 110 adjacent thereto. In addition, the third flow R33 can be formed between the plurality of first ribs 121", between the plurality of second ribs 122", and between the plurality of third ribs 123". That is, the second flow R32 formed along the edge of the first heat conducting surface 110 prevents generation of eddy currents in the flow R3 of the first fluid R, and the third flow R33 formed between adjacent ribs can improve heat transfer performance with respect to the second fluid W by generating turbulence in the flow R3 of the first fluid R.

[0063] Referring to Figure 9The first ribs 121''' can include a plurality of first ribs 121''' each of which extends long in a direction crossing the left-right direction LR and is spaced apart from each other in the left-right direction LR. The second ribs 122''' can include a plurality of second ribs 122''' each of which extends long in a direction crossing the left-right direction LR and is spaced apart from each other in the left-right direction LR. The third ribs 123''' can include a plurality of third ribs 123''' each of which extends long in a direction crossing the left-right direction LR and is spaced apart from each other in the left-right direction LR.

[0064] The plurality of first ribs 121''' can each form a first angle theta1 with a virtual line extending from the boundary Bo toward the right side. The first angle theta1 can be an acute angle. The plurality of second ribs 122''' can each form a second angle theta2 with a virtual line extending from the boundary Bo toward the left side. The second angle theta2 can be an acute angle. The plurality of third ribs 123''' can each form a third angle theta3 with a virtual line extending from the boundary Bo toward the right side. The third angle theta3 can be an acute angle.

[0065] The plurality of first ribs 121''' and the right side edge Er of the first heat conducting surface 110 can be spaced apart from each other by a seventh distance d7. The plurality of second ribs 122''' and the left side edge El of the first heat conducting surface 110 can be spaced apart from each other by an eighth distance d8. The plurality of third ribs 123''' and the right side edge Er of the first heat conducting surface 110 can be spaced apart from each other by a ninth distance d9. For example, the seventh distance d7, the eighth distance d8, and the ninth distance d9 can be the same as each other.

[0066] Thus, the flow R4 of the first fluid R on the first heat conducting surface 110 can bypass the plurality of first ribs 121''', the plurality of second ribs 122''', and the plurality of third ribs 123''' from the inflow port 13 to the outflow port 14.

[0067] At this time, the flow R4 of the first fluid R can be divided into a first flow R41, a second flow R42, and a third flow R43. The first flow R41 can cross the boundary Bo. Also, the second flow R42 can be formed between one end of each of the first ribs 121''', the second ribs 122''', and the third ribs 123''' and the edge of the first heat conducting surface 110 adjacent thereto. In addition, the third flow R43 can be formed between the plurality of first ribs 121''', between the plurality of second ribs 122''', and between the plurality of third ribs 123'''. That is, the second flow R42 formed along the edge of the first heat conducting surface 110 prevents vortexes from being generated in the flow R4 of the first fluid R, and the third flow R43 formed between the adjacent ribs can improve the heat transfer performance with respect to the second fluid W by generating turbulence in the flow R4 of the first fluid R.

[0068] In particular, the first ribs 121", the second ribs 122", and the third ribs 123" are obliquely arranged, so that the aforementioned prevention of vortexes and promotion of turbulence can be more smoothly achieved.

[0069] According to an aspect of the present application, there is provided a plate-shaped heat exchanger including: a first plate provided with a corrugated first heat conducting surface through which a first fluid flows; a second plate provided with a corrugated second heat conducting surface through which a second fluid flows, the second plate being stacked with the first plate; and a rib provided to a portion of the first heat conducting surface, the corrugated first heat conducting surface alternately forming a crest and a trough, the rib protruding from the trough of the first heat conducting surface toward the crest and being in contact with the second plate.

[0070] In addition, according to another aspect of the present application, the rib can be formed together with the crest when the first plate is punched.

[0071] In addition, according to another aspect of the present application, the first heat conducting surface can be long in an up-down direction, the crest and the trough of the first heat conducting surface can be long in a direction crossing the up-down direction, and the rib can include a plurality of ribs spaced apart from each other in the up-down direction.

[0072] In addition, according to another aspect of the present application, the plurality of ribs can include: a first rib adjacent to a right side of the first heat conducting surface; a second rib adjacent to a left side of the first heat conducting surface, the second rib being located on an upper side than the first rib; and a third rib adjacent to the right side of the first heat conducting surface, the third rib being located on an upper side than the second rib.

[0073] In addition, according to another aspect of the present application, the first rib, the second rib, and the third rib can be long in a left-right direction, respectively.

[0074] In addition, according to another aspect of the present application, the first heat conducting surface can be symmetrically formed in a left-right direction with reference to a virtual boundary extending in an up-down direction, one end of the first rib can be located at a right side of the first heat conducting surface and the other end can be located at the boundary, one end of the second rib can be located at a left side of the first heat conducting surface and the other end can be located at the boundary, and one end of the third rib can be located at the right side of the first heat conducting surface and the other end can be located at the boundary.

[0075] In addition, according to another aspect of the present application, the first heat conducting surface is formed symmetrically in the left-right direction with reference to a virtual boundary extending in the up-down direction, one end of the first rib is spaced apart from a right side of the first heat conducting surface by a first distance, and the other end is located at the boundary, one end of the second rib is spaced apart from a left side of the first heat conducting surface by a second distance, and the other end is located at the boundary, and one end of the third rib is spaced apart from the right side of the first heat conducting surface by a third distance, and the other end is located at the boundary.

[0076] In addition, according to another aspect of the present application, the first distance, the second distance, and the third distance can be the same as each other.

[0077] In addition, according to another aspect of the present application, the first rib can include a plurality of first ribs spaced apart from each other in the left-right direction, the second rib can include a plurality of second ribs spaced apart from each other in the left-right direction, and the third rib can include a plurality of third ribs spaced apart from each other in the left-right direction.

[0078] In addition, according to another aspect of the present application, the plurality of first ribs and the right side of the first heat conducting surface can be spaced apart from each other by a fourth distance, the plurality of second ribs and the left side of the first heat conducting surface can be spaced apart from each other by a fifth distance, and the plurality of third ribs and the right side of the first heat conducting surface can be spaced apart from each other by a sixth distance.

[0079] In addition, according to another aspect of the present application, the plurality of first ribs, the plurality of second ribs, and the plurality of third ribs can extend long in the left-right direction.

[0080] In addition, according to another aspect of the present application, the plurality of first ribs, the plurality of second ribs, and the plurality of third ribs can extend long in a direction crossing the left-right direction.

[0081] In addition, according to another aspect of the present application, the first fluid can be a refrigerant, and the second fluid can be water.

[0082] Any of the aforementioned embodiments of the present application or other embodiments are not exclusive or different from each other. Individual configurations or functions of any of the aforementioned embodiments of the present application or other embodiments can be mixed and used or combined.

[0083] For example, it means that a configuration A described in a specific embodiment and / or a drawing and a configuration B described in other embodiment and / or a drawing can be combined. That is, even if the combination between the configurations is not directly described, it means that the combination is possible unless the description indicates that the combination is not possible.

[0084] The above detailed description should be understood as being illustrative only and not limiting in all aspects. The scope of the application should be determined by reasonable interpretation of the appended claims and all changes that come within the equivalent scope of the application should be embraced by the claims.

Claims

1. A plate heat exchanger, wherein comprises: a first plate provided with a first wave-shaped heat transfer surface through which a first fluid flows; a second plate provided with a second wave-shaped heat transfer surface through which a second fluid flows, the second plate being stacked with the first plate; a plurality of ribs provided to a portion of the first heat transfer surface and spaced apart from each other in the up-down direction; the wave shape of the first heat transfer surface is formed with peaks and troughs alternately; the plurality of ribs protrude from the troughs of the first heat transfer surface toward the peaks and contact the second plate; the plurality of ribs include first ribs and second ribs; the first ribs include a plurality of first ribs spaced apart from each other in the left-right direction, the plurality of first ribs and the right side of the first heat transfer surface being spaced apart from each other by a first distance; the second ribs include a plurality of second ribs spaced apart from each other in the left-right direction, the plurality of second ribs and the left side of the first heat transfer surface being spaced apart from each other by a second distance; the plurality of first ribs and the plurality of second ribs extend long in a direction intersecting the left-right direction.

2. The plate heat exchanger according to claim 1, wherein the plurality of ribs are formed together with the peaks when the first plate is punched.

3. The plate heat exchanger according to claim 1, wherein the first heat transfer surface extends long in the up-down direction, the peaks and the troughs of the first heat transfer surface extend long in a direction intersecting the up-down direction.

4. The plate heat exchanger according to claim 3, wherein the first ribs are adjacent to the right side of the first heat transfer surface; the second ribs are adjacent to the left side of the first heat transfer surface and are located on the upper side than the first ribs; the plurality of ribs further include: third ribs adjacent to the right side of the first heat transfer surface and located on the upper side than the second ribs.

5. The plate heat exchanger according to claim 4, wherein the third ribs include a plurality of third ribs spaced apart from each other in the left-right direction.

6. The plate heat exchanger according to claim 5, wherein the plurality of third ribs and the right side of the first heat transfer surface are spaced apart from each other by a third distance.

7. The plate heat exchanger according to claim 1, wherein the first fluid is a refrigerant, the second fluid is water.

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