Heat Exchanger with a Double-Tube Structure Utilizing Seawater as a Medium

Abstract

The present invention comprises: a fixing plate having through holes arranged vertically such that the ends of a plurality of vertically arranged outer tubes are each penetrated and fixed; an inner tube inserted into the outer tube; an outer tube fluid flow path changing plate provided on the outside of the fixing plate to change the flow of fluid flowing through the outer tube; and an inner tube fluid flow path changing plate provided on the outside of the fluid flow path changing plate to change the flow path of seawater flowing through the inner tube. It consists of, The present invention relates to a heat exchanger that utilizes seawater as a medium and has a double-pipe structure, which is applicable to a heat exchanger and system using seawater, and can be configured to simplify the manufacturing process through the combination of heat exchanger components, thereby maximizing the effect of reducing production costs of the heat exchanger, and can suppress corrosion phenomena when highly corrosive seawater flows, thereby significantly extending the service life cycle of the heat exchanger and expecting the effect of reducing maintenance costs.

Description

Technology Field

[0001] The present invention relates to a heat exchanger, wherein a double-pipe structure is adopted on the inner side of the heat exchanger so that a medium, such as a fluid supplied from a heat source, flows through the pipe with a smaller inner diameter, and a relatively larger inner diameter pipe containing the pipe with the smaller inner diameter allows for the circulation of seawater, etc. Background Technology

[0003] Heat exchangers adopted in conventional heat exchange devices or heat exchange systems are devices used for heat exchange between a low-temperature heat-absorbing medium and a high-temperature heat-supplying medium, and are used in various fields such as refrigerators, heating equipment, and cooling equipment.

[0004] In particular, heat exchangers applied to ships and the like utilize seawater as a cooling medium.

[0005] Generally, ships store various liquid substances, such as fuel oil, fresh water (meaning fresh water rather than seawater), seawater stored in ballast tanks to control the ship's center of gravity, and lubrication oil, in partitioned spaces within the ship defined by bulkheads.

[0006] These heat exchangers on ships cool down heat generated from machinery such as the ship's engine, and play a role similar to a car's radiator. Dozens of types of heat exchangers are applied and used on ships, such as air coolers, lubricating oil coolers, or fresh water coolers.

[0007] In particular, the fresh water cooler is a type of machinery cooling system on a ship, and uses a method of circulating fresh water in a closed loop to cool the machinery.

[0008] For example, a ship heat exchanger according to the prior art has a closed-circulation structure and has a fresh water line filled with fresh water and a seawater flow line that crosses from a fresh water cooler.

[0009] Here, machinery and a fresh water cooler are piped along the fresh water line. The fresh water is heated as it passes through the machinery while circulating in a closed loop along the fresh water line by a circulation pump, and is cooled in the fresh water cooler.

[0010] The seawater flow line has a structure comprising: a sea chest, which is a type of seawater discharge and inlet facility located below the waterline of the hull; a seawater inlet pipe having a seawater circulation pump that pressurizes seawater supplied from the sea chest; a heat transfer pipe connected to the seawater inlet pipe and disposed inside a freshwater cooler; an outlet pipe connected to the heat transfer pipe and piped to the outlet side of the freshwater cooler; and a drain pipe that is coupled through a pipe connecting member of the outlet pipe and discharges the seawater, which has become high temperature as it completes heat exchange with freshwater in the freshwater cooler, into the surrounding sea area.

[0011] As such, heat exchangers adopted and used in ships have primarily utilized relatively low-temperature seawater to cool heat generated by machinery installed on the vessel; however, recently, there is a need for heat exchangers to be utilized as heating devices within the ship.

[0012] There is an increasing need not only for heat exchangers that ensure heating efficiency within ships, but also for heat exchangers capable of cooling by utilizing seawater for heat exchange.

[0013] However, there is a problem in that the heat exchanger must have a considerably complex structure to have such a function.

[0014] Meanwhile, as the aquaculture industry grows, it is approaching 40% of the total fisheries production. However, the biggest concern for the domestic aquaculture industry is that when water temperatures drop in winter, the skyrocketing price of oil makes it impossible to raise fish using heated oil boilers as before. Consequently, there is an increasing trend of utilizing seawater for heat exchange, and technological developments are being made for this purpose.

[0015] Recently, as one of the methods or configurations to improve these problems, heat pumps utilizing geothermal or waste heat have begun to be used. However, using double-pipe heat exchangers made of cupronickel or stainless steel resulted in corrosion issues after 2 to 3 years, leading to high costs for replacing the double-pipe heat exchangers. Therefore, to solve this corrosion problem, a system was developed in which copper pipes are used for the heat exchanger inside the heat pump in an indirect manner, and a titanium plate heat exchanger is installed externally to exchange heat with seawater by circulating water.

[0016] Although these indirect heat exchangers solved the problem of corrosion caused by seawater, they occupied a large installation space, caused difficulties in maintenance due to their complex equipment, and incurred high manufacturing costs. Furthermore, they suffered from reduced heat exchange efficiency caused by clogging or scale formation in the plate heat exchangers during heat exchange with wastewater from the evaporator.

[0017] Therefore, while it would be most appropriate to use titanium for the condenser, evaporator, and heat exchanger within the heat pump and utilize a double-pipe system, the titanium tubes constituting the double pipe cannot be welded to tubes of other materials at the finishing or connection points. Consequently, a flange connection method had to be used, which caused gas leakage problems at the flange sections over time.

[0018] Meanwhile, Korean Published Patent No. 10-2010-0020795 (published on Feb. 22, 2010), Korean Published Patent No. 10-2015-0010825 (published on Jan. 29, 2015), Korean Published Patent No. 10-2015-0010826 (published on Jan. 29, 2015), Korean Registered Patent No. 10-1797176 (published on Nov. 13, 2017), and Korean Registered Patent No. 10-1797177 (published on Nov. 7, 2017) disclose structures such as heat exchangers using double pipes.

[0019] The aforementioned prior art documents each present a double tube structure that is formed in a spiral shape or a method for manufacturing such a double tube structure, a double tube structure applied to an internal heat exchanger of an air conditioning system to which an alternative refrigerant is applied, a double tube having a groove-shaped inner tube with a groove formed on the outer surface, a spiral shape having an uneven structure on the outer inner surface, or a double tube structure having an outer tube simply formed on the outer surface of the inner tube.

[0020] Such prior art also presents the form or structure of a double tube.

[0021] However, when the components disclosed in the prior art are applied to heat exchangers using seawater, it is pointed out that they are unsuitable due to a decrease in service life caused by corrosion.

[0022] In addition, some prior art documents have a complex structure, which leads to increased production costs during the manufacturing process. Prior art literature

[0024] Korean Published Patent No. 10-2010-0020795 (Published Feb. 22, 2010) Korean Published Patent No. 10-2015-0010825 (Published Jan. 29, 2015) Korean Published Patent No. 10-2015-0010826 (Published Jan. 29, 2015) Korean Registered Patent No. 10-1797176 (Published Nov. 13, 2017) Korean Registered Patent No. 10-1797177 (Published Nov. 7, 2017) The problem to be solved

[0025] The present invention was devised to resolve the aforementioned problems.

[0026] The main objective of the present invention is to reduce the production cost of a heat exchanger by configuring the manufacturing process through the combination of heat exchanger components to be simple, while applying it to a heat exchanger and system using seawater.

[0027] In addition, the present invention has another purpose of preventing corrosion phenomena expected when using seawater. means of solving the problem

[0029] The present invention for achieving the above-mentioned purpose is,

[0030] A fixing plate having through holes arranged vertically so that the ends of multiple external tubes arranged vertically can be fixed by penetrating each end of the tubes.

[0031] An inner tube introduced into the interior of the above exterior;

[0032] An external tube fluid flow path changing plate provided on the outer side of the above fixed plate to switch the flow of fluid flowing through the external tube;

[0033] An inner tube fluid flow changing plate provided on the outer side of the outer tube fluid flow changing plate, for changing the flow path of seawater flowing through the inner tube;

[0034] It is characterized by being composed of Effects of the invention

[0036] According to the present invention, it is applicable to a heat exchanger and a system using seawater, and by configuring the manufacturing process through the combination of components of the heat exchanger to be simple, the effect of reducing the production cost of the heat exchanger can be maximized.

[0037] In addition, the present invention provides a heat exchanger using seawater as a medium, and by enabling the suppression of corrosion phenomena when highly corrosive seawater flows, the service life cycle of the heat exchanger can be significantly extended, thereby allowing for the expectation of reduced maintenance costs. Brief explanation of the drawing

[0039] FIGS. 1 and 2 are drawings illustrating an example of a heat exchanger to which the present invention is applied. FIG. 3 is an exploded view illustrating the fixed plate, the outer tube fluid path changing plate, and the inner tube fluid path changing plate provided on both sides of the heat exchanger according to FIG. 1 and 2, respectively, in a separated state. FIG. 4 is an exploded perspective view showing the separated state of FIG. 3 using an isometric projection method. Figure 5 is a partially enlarged drawing illustrating the flow of a channel through which seawater flows into the interior and is discharged to the other side. FIG. 6 is a diagram schematically illustrating an example in which the flow of seawater is converted by the second fluid path groove in the internal pipe fluid path changing plate in the flow after the inflow of seawater according to FIG. 5. FIG. 7 is a diagram schematically illustrating an example in which the flow of a fluid (water) entering through the inlet line of an outer pipe is converted by the first fluid flow path groove of an outer pipe fluid flow path changing plate. FIG. 8 is a drawing illustrating an example in which a housing is configured on the outer side of the heat exchanger according to FIG. 1 and 2, and a cooling / heating water inlet pipe and a cooling / heating water outlet pipe are formed respectively on the upper and lower sides of one side of the housing. Specific details for implementing the invention

[0040] Specific structural or functional descriptions of embodiments according to the concept of the present invention disclosed in this specification are provided merely for the purpose of explaining embodiments according to the concept of the present invention.

[0041] Embodiments according to the concept of the present invention may be subject to various modifications and may take various forms, and thus include all modifications, equivalents, or substitutions that fall within the spirit and technical scope of the present invention. Furthermore, terms or words used in the specification and claims are not limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the fact that the inventor may appropriately define the concept of the terms to best describe his invention.

[0042] Therefore, the embodiments described in the specification of the present invention and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may be possible or exist at the time of filing the present invention.

[0043] Furthermore, unless otherwise defined in the specification of the present invention, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains.

[0044] Terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this specification.

[0046] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

[0048] As shown in the attached drawings, the present invention comprises an inner tube (120), an outer tube (110), a fixed plate (130), an outer tube fluid flow path changing plate (140), and an inner tube fluid flow path changing plate (150) as components for constituting a heat exchanger.

[0049] As shown in FIG. 1, the present invention is characterized by being composed of an inner tube (120) and an outer tube (110), and has a configuration in which an inner tube (120) with a relatively smaller diameter is inserted into the outer tube (110).

[0050] First, as stated in the purpose, the present invention utilizes seawater as a heat exchange medium.

[0051] Seawater contains salt, and due to this characteristic, there is a possibility of corrosion in the internal pipe (120) through which the seawater flows, as well as in the pipes of mechanical devices through which the seawater flows.

[0052] Since the present invention is not extended to mechanical devices, it aims to improve it by reducing it to only the internal structure of a heat exchanger.

[0053] Therefore, it is important to ensure that the material adopted for the inner tube (120) through which seawater flows, as well as the outer tube (110) and various plates, such as the fixed plate (130), the outer tube fluid flow path changing plate (140), and the inner tube fluid flow path changing plate (150), has corrosion-resistant properties.

[0054] Before describing the structural components of the heat exchanger (100), a technical concept for securing corrosion resistance to suppress the corrosive effects that may occur due to seawater is described.

[0055] Typically, to address the corrosiveness of seawater, heat exchangers are constructed using titanium metal.

[0056] Titanium metal has the advantages of very high strength, resistance to heat, excellent corrosion resistance, lightness compared to other metals, and excellent stability; however, it also has the disadvantages of being a rare element, expensive, and difficult to process.

[0057] As such, titanium, which is commonly used in heat exchangers utilizing seawater, has the advantage of excellent corrosion resistance, but it also has the disadvantage of being expensive.

[0058] As an alternative to overcome these disadvantages, it may be composed of any one of stainless steel, nickel alloy, copper-nickel alloy (cupronic-nickel), aluminum alloy, plastic and composite material, titanium clad steel, or a composite material.

[0059] In particular, when the composition ratio of copper to nickel in copper-nickel alloys (cupronic-nickel) is 90:10 or 70:30, excellent corrosion resistance can be secured.

[0060] Therefore, in addition to using titanium for the entire component material of the heat exchanger, it is also possible to implement a substitute material utilizing a copper-nickel alloy in the present invention.

[0062] In addition, unlike titanium alone, alloying, surface treatment, anodic protection, corrosion inhibitors, etc., can be used.

[0063] For example, corrosion resistance can be improved by alloying titanium with metal elements such as aluminum, vanadium, nickel, and molybdenum.

[0064] For example, it is desirable to use a titanium alloy material composed of 6% by weight of aluminum and 4% by weight of vanadium relative to the total weight of titanium, a titanium alloy material composed of 3% by weight of aluminum and 2.5% by weight of vanadium relative to the total weight of titanium, or a titanium alloy material composed of 0.3% by weight of molybdenum and 0.8% by weight of nickel relative to the total weight of titanium.

[0065] The above-mentioned titanium alloy material is formed by the composition of an additive alloy material that constitutes a predetermined weight portion relative to the total weight of the pure titanium alloy.

[0066] In contrast, when applying a heat exchanger according to the present invention that utilizes seawater using a metal other than titanium, a method of coating the surface of the material can be considered.

[0067] For example, corrosion resistance to seawater can be expected through epoxy coating, fluoropolymer coating, ceramic coating, anodizing, thermal spray coating, electroplating, chemical vapor deposition, etc., as the surface layer of the heat exchanger material.

[0068] Epoxy coating can be applied to the surface of each component of a heat exchanger by mixing a resin and a hardener using a brush, roller, or spray method. For example, epoxy coating can be applied using a mixing ratio of 1:1, 2:1, or 4:1 for the epoxy resin and hardener.

[0069] After coating in this manner, it undergoes a curing process that hardens over a certain period of time.

[0070] Meanwhile, the fluoropolymer coating can be made to have chemical stability, heat resistance, a low coefficient of friction, and excellent corrosion resistance. The fluoropolymer resin may be composed by mixing at least one additive such as PTFE (polytetrafluoroethylene), FEP (fluoroethylenepropylene), PFA (perfluoroalcoholoxy), and PVDF (polyvinylidene fluoride).

[0071] The above ceramic coating can be achieved by alumina (Al2O3) coating, zirconia (ZrO2) coating, titanium dioxide (TiO2) coating, silicon carbide (SiC) coating, etc., and can be coated by mixing additives such as curing agents, softeners, pigments, flow improvers, and dispersants as additives added for the ceramic coating.

[0072] The anodizing described above is an electrochemical process that forms a strong oxide layer on a metal surface, and when applied to heat exchangers using seawater, it can increase corrosion resistance.

[0073] The above thermal spray coating involves heating materials such as metals, ceramics, alloys, or plastics to a high temperature and spraying them onto a surface, and can be considered one of the coating methods that is resistant to corrosion, wear, and thermal stress.

[0074] The above electroplating refers to a process of electrochemically coating a thin layer of another metal or alloy onto a metal surface. It is effective for preventing corrosion, improving wear resistance, and increasing conductivity of heat exchangers, and is particularly suitable for use in marine environments.

[0075] Chemical Vapor Deposition (CVD) refers to a process that utilizes chemical reactions to form a coating on a solid surface, and it can be usefully applied to high-performance equipment such as heat exchangers.

[0076] Accordingly, the components constituting each configuration of the heat exchanger according to the present invention may be subjected to any one of the aforementioned coating processes.

[0078] In the following, specific details regarding the components of the present invention will be described.

[0080] As described above, the heat exchanger (100) of the present invention utilizes seawater as a heat medium and is broadly divided into a fixed plate (130), an outer tube (110) and an inner tube (120) as seen in FIG. 1, an outer tube fluid flow path changing plate (140), and an inner tube fluid flow path changing plate (150).

[0081] The above-mentioned fixed plate (130) has a structure in which through holes (131) are arranged vertically so that the ends of a plurality of external tubes arranged vertically can be fixed by passing through each of their respective ends.

[0082] It is preferable that the above-mentioned through holes (131) have a two-row arrangement that alternates vertically along the fixed plate (130).

[0083] Each through hole (131) of the fixed plate (130) positioned on each side is fixed to each end of the outer tube (110).

[0084] The fixing method can be achieved by methods such as welding, and can also be fixed by other methods.

[0085] Meanwhile, an inlet line (111) and an outlet line (112) are configured on the upper and lower sides of one side of the fixed plate (130) to allow a fluid that is heat-exchanged by seawater to be introduced and withdrawn, respectively.

[0086] To this end, it is preferable that the outer tube (110) constituting the inlet line (111) and the outer tube (110) constituting the outlet line (112) be formed to be longer than the other outer tube (110) that is fixed between the fixed plates (130).

[0087] The above outer tube (110) is configured to allow a fluid that exchanges heat with seawater to flow, so that it flows toward various machinery to lower the temperature of the machinery, or is supplied toward heating machinery to enable a heating effect using the temperature of the seawater.

[0088] Here, an inner tube (120) for seawater to flow into the interior of the outer tube (110) is introduced.

[0089] Between the inner tube (120) and the outer tube (110), a flow path must be formed to guide the flow of fluid, namely water, for heat exchange by being spaced apart at an appropriate distance.

[0090] Meanwhile, the inner tube (120) must be configured to penetrate the outer tube fluid flow path changing plate (140) described above.

[0091] First, before explaining this, an external tube fluid flow path changing plate (140) is described, which is provided on the outside of the fixed plate (130) to change the flow of fluid flowing through the external tube (110).

[0092] The above-mentioned outer tube fluid flow path changing plate (140) should be understood as a component for changing the flow of fluid, i.e., water, flowing through the flow path, which is the space between the outer tube (110) and the inner tube (120), as described above.

[0093] For this purpose, the external fluid flow path changing plate (140) has a first fluid flow path groove (141) formed in a diagonal direction as shown in the drawing.

[0094] In addition, an internal tube inlet hole (142) is drilled at each end of the first fluid channel groove (141) to be connected to both ends of the internal tube (120).

[0095] In addition, on one side of the external pipe fluid flow path changing plate (140), preferably on the side where the inlet line (111) and outlet line (112) of the external pipe (110) are provided, an external pipe penetration hole (143) is drilled so that the external pipe (110) can pass through.

[0096] The inner tube inlet (142) is configured to be fixed so that the inner tubes (120) can be naturally spaced apart from the inner surface of the outer tube (110), thereby securing space for the flow of water, which is a fluid, and is configured to allow heat exchange with seawater flowing through the inner tube (120).

[0097] Therefore, the seawater flowing through the inner tube (120) can generate a continuous flow of water to another inner tube (120) in a state where the flow path is changed through the inner tube fluid path changing plate (150) described later.

[0098] The internal tube fluid flow path changing plate (150) is provided on the outside of the external tube fluid flow path changing plate as seen in Figure 4 or Figure 7, and has a structure that changes the flow path of seawater flowing through the internal tube.

[0099] For this purpose, the inner tube fluid flow path changing plate (150) should be formed so that its length is relatively smaller than that of the outer tube fluid flow path changing plate (140), as seen in FIGS. 2 to 4.

[0100] This is because the inlet line (111) and the outlet line (112), which must protrude toward the outer pipe penetration hole () of the outer pipe fluid flow path changing plate (140) on one side of the outer pipe (110), must not interfere with the inner pipe fluid flow path changing plate (150).

[0101] In addition, among the internal pipe inlet holes (142) drilled in the uppermost and lowermost first fluid path grooves (141) of the other side external pipe fluid path changing plate (140) that is not equipped with the inlet line (111) and outlet line (112), the positions of the internal pipe inlet holes (142) corresponding to the uppermost and lowermost positions must be kept in a blocked state.

[0102] By adopting such a configuration, the fluid (water) introduced along the inlet line (111) of the outer pipe (120) can naturally flow through the first fluid path groove (141) of the outer pipe fluid path changing plate (140) and then undergo a series of processes to be discharged through the outlet line (112) provided at the bottom side of the heat exchanger (100).

[0103] Meanwhile, the aforementioned inner tube (120) is fixed by a method such as welding while in close contact with each inner tube inlet hole (142) of the outer tube fluid flow path changing plate (140), and its airtightness must be ensured.

[0104] For example, the fluid (water) flowing along the outer tube (110) changes its path through the first fluid path groove (141) in the outer tube fluid path changing plate (140). However, if the tightness between the inner tube (120) and the inner tube inlet hole (142) and the welded fixed inner tube is not secured, the fluid (water) may flow into the inner tube fluid path changing plate (150), and conversely, seawater flowing through the inner tube (120) may flow into the outer tube (110), potentially causing corrosion to parts such as various machinery.

[0105] Therefore, in order to resolve these problems, tight watertightness must be ensured between the inner surface of the inner tube inlet hole (142) of the outer tube fluid flow path changing plate (140), which is fixed in contact with both ends of the inner tube (120).

[0106] Meanwhile, the inner tube fluid flow change plate (150), which is relatively shorter in length than the outer tube fluid flow change plate (140), is fixed to the outer surface of the outer tube fluid flow change plate (140) as shown in Figure 1.

[0107] The method or process of fixing the inner tube fluid flow change plate (150) that is fixed to the outside of the outer tube fluid flow change plate (140) can be done by welding or other methods, and in this case, watertightness must also be ensured.

[0108] Meanwhile, on the inner side of the internal tube fluid flow path changing plate (150), a second fluid flow path groove (151) is formed diagonally to change the flow path of seawater flowing through the internal tube (120).

[0109] In addition, as described above, the inner tube (120) is intended to be used as a refrigerant by introducing seawater, and the seawater inlet line (121) for allowing seawater to flow into the inner tube (120) of the heat exchanger (100) and the seawater discharge line (122) for discharging the heat-exchanged seawater must be passed through the outer tube fluid flow path changing plate (140) on the other side, which is configured to allow the inlet line (111) and outlet line (112) of the outer tube (110) to pass through.

[0111] A heat exchanger (100) having the above configuration has an overall structure as shown in FIG. 1.

[0112] To briefly explain the operation relationship of the heat exchanger (100) according to the above configuration, seawater is introduced into the interior of the vessel by means of a separate pumping means, and then introduced into the heat exchanger (100) through the inner pipe (120).

[0113] In addition, water that has been heated during the process of cooling the machinery to cool the heat generated in the machinery inside the ship flows into the outer pipe (110) through the inlet line (111).

[0114] In this way, seawater with a relatively low temperature flowing into the inner tube (120) and fluid (water) with a relatively high temperature flowing into the outer tube (110) flow along the outer tube (110) and inner tube (120) inside the heat exchanger (100), respectively, and heat exchange between the fluid (water) having a high temperature and hot state and the seawater having a low temperature state occurs through the outer surface of the inner tube (120). After the seawater is heat-exchanged to a high temperature state, it is discharged into the sea through the seawater discharge line (122), and the fluid (water) heat-exchanged to a low temperature state flows into the machinery side through the withdrawal line (112), undergoing a series of processes.

[0115] The above-described operation flow can perform the role of lowering the temperature of the machinery using seawater.

[0116] Although the above-described embodiment was explained for the purpose of reducing heat generated during the operation of machinery equipped in a ship, the heat exchanger (100) of the present invention can be implemented as a heating or cooling device.

[0117] For example, if a cooling effect is to be achieved by connecting the air conditioning system inside a ship and the heat exchanger (100) of the present invention, the aforementioned fluid flow can be applied as is.

[0118] That is, the refrigerant that has been heat-exchanged by the indoor cooling system flows into the inlet line (111) of the outer pipe (110), and seawater flows in through the seawater inlet line (121) of the inner pipe (120). After mutual heat exchange in the heat exchanger (100), the refrigerant whose temperature has been lowered is supplied back to the indoor cooling system, and the seawater that has taken heat from the refrigerant that has flowed into the heat exchanger (100) in the high-temperature state is discharged back into the sea through the seawater discharge line (122), thus forming a series of flows.

[0119] In the case of summer, the interior of the ship, which is in a relatively high temperature state, can expect a cooling effect through the heat exchanger (100) of the present invention by the inflow of seawater in a relatively low temperature state.

[0120] The air conditioning system installed inside the vessel may be implemented by utilizing existing structures, and a detailed description is omitted as such configurations fall outside the scope of the rights of this invention.

[0122] In addition, by using the heat exchanger (100) of the present invention, when the outside temperature is relatively low, such as in winter, a heating effect can be achieved indoors by utilizing seawater with a relatively high temperature.

[0123] In this case as well, it goes without saying that the flow of seawater and fluid (water) applies equally.

[0124] Here, as a method to maximize heating efficiency, one can consider providing a heater (not shown) on the inlet line (111) side of the heat exchanger (100) into which seawater flows.

[0125] In severe cold conditions such as extreme winter, the heat exchange efficiency between the seawater and the heating water flowing through the ship's indoor air conditioning system is extremely low, so it is desirable to maximize the heat exchange efficiency inside the heat exchanger (100) by configuring a heater in the inlet line (111) to heat the incoming seawater.

[0126] By ensuring these conditions, the heating water flowing through the ship's indoor air conditioning system can maintain an appropriate temperature and improve heating efficiency.

[0127] In addition, as shown in FIG. 8, a housing (200) is configured on the outside of the heat exchanger (100), and a heating and cooling water inlet pipe (160) and a heating and cooling water outlet pipe (170) are formed on the upper and lower sides of one side of the housing (200), respectively, so that heat exchange can be performed by connecting to the indoor air conditioning system of the ship as described above.

[0129] As described above, although the present invention has been explained by limited embodiments and drawings, the present invention is not limited to the above embodiments, and it is obvious that various modifications and variations from the description above may be possible by those skilled in the art to which the present invention belongs.

[0130] Therefore, the technical concept of the present invention should be understood by the claims set forth below, but it is obvious that all equivalent or analogous variations thereof fall within the scope of the technical concept of the present invention. Explanation of the symbols

[0132] 100; Heat exchanger 110; Outer tube 111; Inflow line 112; Outflow line 120; Internal pipe 121; Seawater inflow line 122; Seawater discharge line 130; Fixed plate 131; through hole 140; external pipe fluid flow path change plate 141; First fluid passage groove 142; Internal pipe inlet hole 143; outer pipe penetration hole 150; inner pipe fluid path diversion plate 151; Second fluid passage groove 160; Heating and cooling water inlet pipe 170; Heating / Cooling Water Outlet Pipe 200; Housing

Claims

Claim 1 A fixing plate having through holes arranged vertically so that the ends of a plurality of vertically arranged outer tubes can be fixed by penetrating each end of the respective outer tubes; an inner tube inserted into the outer tube; and an outer tube fluid flow path changing plate provided on the outside of the fixing plate to change the flow of fluid flowing through the outer tube. and an inner tube fluid flow changing plate provided on the outer side of the outer tube fluid flow changing plate to change the flow path of seawater flowing through the inner tube; wherein the outer tube fluid flow changing plate includes a first fluid flow groove formed diagonally on one side to connect the outer tubes to each other, an inner tube inlet hole formed at both ends of the first fluid flow groove and perforated so that both ends of the inner tube pass through, and an outer tube penetration hole formed at the upper and lower ends and perforated so that the outer tube passes through; the inner tube fluid flow changing plate is formed to be relatively shorter in length than the outer tube fluid flow changing plate and includes a second fluid flow groove formed diagonally on one side; the inner tube includes a seawater inlet line for allowing seawater to flow in and a seawater discharge line for discharging heat-exchanged seawater, and the seawater inlet line is configured to allow the inlet line and outlet line of the outer tube to pass through. A heat exchanger having a double-pipe structure and utilizing seawater as a medium, comprising: being configured to be penetrated by an external pipe fluid flow change plate, wherein the seawater discharge line is configured to be penetrated by an external pipe fluid flow change plate on a side different from the external pipe fluid flow change plate through which the inlet and outlet lines of the external pipe are configured to penetrate. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 A heat exchanger having a double-tube structure and utilizing seawater as a medium, wherein, in claim 1, the inner tube of the heat exchanger is made of either titanium or a copper-nickel alloy. Claim 7 A heat exchanger having a double-tube structure and utilizing seawater as a medium, wherein the inner tube is made of a titanium alloy material comprising 6% by weight of aluminum and 4% by weight of vanadium relative to the total weight of titanium, or a titanium alloy material comprising 3% by weight of aluminum and 2.5% by weight of vanadium relative to the total weight of titanium, or a titanium alloy material comprising 0.3% by weight of molybdenum and 0.8% by weight of nickel relative to the total weight of titanium. Claim 8 A heat exchanger having a double-tube structure and utilizing seawater as a medium, wherein, in claim 1, the surface layer of the inner tube is surface-treated by any one of epoxy coating, fluoropolymer coating, ceramic coating, anodizing, thermal spray coating, electroplating, and chemical vapor deposition.

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