Novel surface type through-sea cooling system based on two-phase condensing booster heat pipe

Abstract

The application discloses a novel surface type sea cooling system based on two-phase condensation supercharged heat pipes, which comprises a heat pipe condenser, a gas-phase condensate main loop pipeline, a conformal heat pipe, a liquid-phase condensate loop pipeline, a two-phase condensation shock wave supercharging mechanism and a gas-phase condensate branch loop pipeline. The heat pipe condenser is arranged in a ship body. One end of the gas-phase condensate main loop pipeline is connected with an outlet of the heat pipe condenser. The conformal heat pipe is conformally embedded in the inside of a bulkhead of the ship body, an inlet of the conformal heat pipe is connected with the other end of the gas-phase condensate main loop pipeline, and the conformal heat pipe can conduct heat to the wall surface of the bulkhead and take away the heat through the sea water outside the surface of the ship body. Therefore, the novel surface type sea cooling system based on two-phase condensation supercharged heat pipes improves the available volume of the cabin inside, reduces the risk of corrosion and leakage, reduces noise and energy consumption, saves energy and improves the heat pipe heat exchange capacity.

Description

Technical Field

[0001] This invention relates to the field of marine heat exchange technology, and in particular to a novel surface-type sea-passing cooling system based on a two-phase condensation pressurized heat pipe. Background Technology

[0002] Cooling heat source equipment presents several challenges due to the deep operating depths and high seawater pressure of ships, as well as the following issues with traditional seawater cooling systems:

[0003] First, traditional ship cooling systems involve numerous devices such as seawater pumps, sea-entry pipelines, and sea-entry valves, making the system complex.

[0004] Second, traditional ship cooling systems have a large number of high-pressure seawater pipes and valves inside the cabins, which pose significant safety risks.

[0005] Third, traditional ship cooling systems require seawater pumps, which are noisy and energy-intensive.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a novel surface-type sea-passing cooling system based on a two-phase condensation pressurized heat pipe, which increases the usable volume inside the cabin, reduces the risk of corrosion and leakage, reduces noise and energy consumption, saves energy, and improves the heat exchange capacity of the heat pipe.

[0008] To achieve the above objectives, this invention provides a novel surface-type sea-crossing cooling system based on a two-phase condensation pressurized heat pipe, comprising: a heat pipe condenser, a vapor-phase condensate main loop pipe, a conformal heat pipe, a liquid-phase condensate loop pipe, a two-phase condensation shock wave pressurization mechanism, and a vapor-phase condensate branch loop pipe. The heat pipe condenser is installed within the hull. One end of the vapor-phase condensate main loop pipe is connected to the outlet of the heat pipe condenser. The conformal heat pipe is conformally embedded within the hull's bulkhead, with its inlet connected to the other end of the vapor-phase condensate main loop pipe. The conformal heat pipe can conduct heat to the bulkhead surface and carry it away through the external seawater flowing across the hull surface. One end of the liquid-phase condensate loop pipe is connected to the outlet of the conformal heat pipe. A two-phase condensation shock wave pressurization mechanism is installed within the ship's hull. The liquid phase condensate inlet of the mechanism is connected to the other end of the liquid phase condensate circuit pipe, and the two-phase mixed condensate outlet is connected to the inlet of the heat pipe condenser. Additionally, one end of the gas phase condensate branch circuit pipe is connected to the gas phase condensate main circuit pipe, and the other end is connected to the gas phase condensate inlet of the two-phase condensation shock wave pressurization mechanism.

[0009] In one embodiment of the present invention, the heat pipe condenser receives the exhaust steam from the steam turbine generator after it has finished working. By exchanging heat with the heat pipe inside the heat pipe condenser, the condensate inside the heat pipe evaporates to form a high-temperature gas phase. The gas enters the main loop pipeline of the gas phase condensate through the outlet of the heat pipe condenser and is divided into two parts.

[0010] In one embodiment of the present invention, a portion of the gas enters the conformal heat pipe, and another portion of the gas enters the two-phase condensation shock wave pressurization mechanism.

[0011] In one embodiment of the present invention, the heat pipe condenser uses steam to flush the heat pipe, and heat exchange is achieved through phase change inside the heat pipe.

[0012] In one embodiment of the present invention, a portion of the gas enters the conformal heat pipe and exchanges heat with the external cold source seawater, thereby being condensed into liquid phase condensate, which then flows back to the two-phase condensation shock wave pressurization mechanism through the liquid phase condensate loop pipe.

[0013] In one embodiment of the present invention, the gas phase condensate inlet of the two-phase condensation shock wave pressurization mechanism has a Laval nozzle structure to accelerate the incoming gas, converting its internal energy into kinetic energy, and then it enters the mixing chamber within the two-phase condensation shock wave pressurization mechanism.

[0014] In one embodiment of the present invention, after the gas enters the mixing chamber, it generates a shock wave through the condensation of the high-pressure gas flow in the confined space, which in turn injects and pressurizes the returning liquid condensate, thereby achieving efficient operation of the heat pipe and forming a heat pipe cycle.

[0015] In one embodiment of the present invention, a plurality of spiral channels are provided on the wall surface of the conformal heat pipe.

[0016] In one embodiment of the present invention, the heat pipe condenser is inclinedly disposed within the hull of the ship.

[0017] Compared with the prior art, the novel surface-type sea-passing cooling system based on two-phase condensation pressurized heat pipe according to the present invention increases the usable volume inside the cabin, reduces the risk of corrosion and leakage, reduces noise and energy consumption, saves energy, and improves the heat exchange capacity of the heat pipe. Attached Figure Description

[0018] Figure 1 This is a wireframe schematic diagram of a novel surface-type sea-through cooling system based on a two-phase condensation pressurized heat pipe according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of the two-phase condensation shock wave pressurization mechanism of a novel surface-type sea-through cooling system based on a two-phase condensation pressurization heat pipe according to an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram comparing the heat transfer performance of a two-phase pressurized heat pipe and a conventional heat pipe in a novel surface-type sea-through cooling system based on a two-phase condensation pressurized heat pipe according to an embodiment of the present invention.

[0021] Explanation of key figure labels:

[0022] 1-Heat pipe condenser, 2-Main loop pipe for vapor phase condensate, 3-Conformal heat pipe, 4-Bulkhead, 5-Liquid phase condensate loop pipe, 6-Two-phase condensation shock wave pressurization mechanism, 7-Branch pipe for vapor phase condensate, 8-Liquid phase condensate inlet, 9-Vacuum phase condensate inlet, 10-Two-phase mixed condensate outlet. Detailed Implementation

[0023] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0024] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0025] Figure 1 This is a wireframe schematic diagram of a novel surface-type sea-through cooling system based on a two-phase condensation pressurized heat pipe according to an embodiment of the present invention. Figure 2This is a schematic diagram of the structure of the two-phase condensation shock wave pressurization mechanism of a novel surface-type sea-through cooling system based on a two-phase condensation pressurization heat pipe according to an embodiment of the present invention.

[0026] like Figures 1 to 2 As shown, a novel surface-type sea-crossing cooling system based on a two-phase condensation pressurized heat pipe according to a preferred embodiment of the present invention includes: a heat pipe condenser 1, a vapor-phase condensate main loop pipe 2, a conformal heat pipe 3, a liquid-phase condensate loop pipe 5, a two-phase condensation shock wave pressurization mechanism 6, and a vapor-phase condensate branch loop pipe 7. The heat pipe condenser 1 is disposed within the hull. One end of the vapor-phase condensate main loop pipe 2 is connected to the outlet of the heat pipe condenser 1. The conformal heat pipe 3 is conformally embedded within the bulkhead 4 of the hull. The inlet of the conformal heat pipe 3 is connected to the other end of the vapor-phase condensate main loop pipe 2, and the conformal heat pipe 3 can conduct heat to the surface of the bulkhead 4, and carry away the heat by allowing external seawater to lap across the surface of the hull. One end of the liquid-phase condensate loop pipe 5 is connected to the outlet of the conformal heat pipe 3. A two-phase condensation shock wave pressurization mechanism 6 is installed inside the ship's hull. The liquid phase condensate inlet 8 of the two-phase condensation shock wave pressurization mechanism 6 is connected to the other end of the liquid phase condensate circuit pipe 5, and the two-phase mixed condensate outlet 10 of the two-phase condensation shock wave pressurization mechanism 6 is connected to the inlet of the heat pipe condenser 1. One end of the gas phase condensate branch circuit pipe 7 is connected to the gas phase condensate main circuit pipe 2, and the other end of the gas phase condensate branch circuit pipe 7 is connected to the gas phase condensate inlet 9 of the two-phase condensation shock wave pressurization mechanism 6.

[0027] In one embodiment of the present invention, the heat pipe condenser 1 receives the exhaust steam from the steam turbine generator after it has finished working. By exchanging heat with the heat pipe inside the heat pipe condenser 1, the condensate inside the heat pipe evaporates to form a high-temperature gas phase. The gas enters the main circuit pipe 2 of the gas phase condensate through the outlet of the heat pipe condenser 1 and is divided into two parts.

[0028] In one embodiment of the present invention, a portion of the gas enters the conformal heat pipe 3, and another portion of the gas enters the two-phase condensation shock wave pressurization mechanism 6.

[0029] In one embodiment of the present invention, the heat pipe condenser 1 uses steam to flush the heat pipe and achieves heat exchange through phase change inside the heat pipe.

[0030] In one embodiment of the present invention, a portion of the gas enters the conformal heat pipe 3 and exchanges heat with the external cold source seawater, thereby being condensed into liquid phase condensate, which then flows back to the two-phase condensation shock wave pressurization mechanism 6 through the liquid phase condensate loop pipe 5.

[0031] In one embodiment of the present invention, the gas phase condensate inlet 9 of the two-phase condensation shock wave booster mechanism 6 has a Laval nozzle structure to accelerate the incoming gas, converting its internal energy into kinetic energy, and then it enters the mixing chamber within the two-phase condensation shock wave booster mechanism 6.

[0032] In one embodiment of the present invention, after the gas enters the mixing chamber, it generates a shock wave through the condensation of the high-pressure gas flow in the confined space, which in turn injects and pressurizes the returning liquid condensate, thereby achieving efficient operation of the heat pipe and forming a heat pipe cycle.

[0033] In one embodiment of the present invention, a plurality of spiral channels are provided on the wall surface of the conformal heat pipe 3. The heat pipe condenser 1 is inclinedly disposed within the hull.

[0034] Figure 3 This is a schematic diagram comparing the heat transfer performance of a two-phase pressurized heat pipe and a conventional heat pipe in a novel surface-type sea-through cooling system based on a two-phase condensation pressurized heat pipe according to an embodiment of the present invention. Figure 3 As shown, experiments were conducted to compare the direct heat transfer performance differences between the novel two-phase pressurized heat pipe and a conventional heat pipe. With the addition of the two-phase pressurization device, the limiting heat flux density increased from 70 kW·m⁻² to 98 kW·m⁻², achieving an improvement of approximately 40%. Simultaneously, the operating temperature was effectively reduced under high heat flux, with a decrease exceeding 10%. Therefore, the novel surface-type sea-through cooling system based on a two-phase condensation pressurized heat pipe of this invention can effectively improve the heat transfer performance of the loop heat pipe.

[0035] In practical applications, the novel surface-type marine cooling system based on a two-phase condensation pressurized heat pipe of this invention completely abandons the traditional ship cooling system. It utilizes the natural cold source of seawater surrounding the ship and employs a novel heat pipe circulation technology based on two-phase pressurization. The evaporation section of the heat pipe contacts the heat source inside the ship, while the condensation end contacts the hull surface, transferring heat from the ship's internal heat source to the ship's walls, and then through the seawater to the ocean's cold source. Simultaneously, this invention uses a heat pipe based on two-phase pressurization technology, which diverts a portion of the gas loop in the evaporation section into the liquid phase loop of the condensate. Through a two-phase condensation pressurization mechanism, the driving capacity of the entire heat pipe is enhanced, improving the heat transfer efficiency. The working principle of this invention is as follows: The heat pipe condenser 1 receives the exhaust steam from the steam turbine generator after it has finished working. It exchanges heat with the heat pipe inside the condenser, evaporating the condensate inside the heat pipe to form a high-temperature gas phase. The gas enters the loop and is divided into two parts. One part enters the channel (conformal heat pipe 3) that is fused with the wall through the main gas phase condensate pipe 2, exchanges heat with the external cold source seawater, and is condensed into a liquid phase that flows back. The other part of the gas enters the two-phase condensation pressurization mechanism through the gas phase condensate branch loop pipe. The high-pressure gas flow condenses in the confined space, generating a shock wave, which injects and pressurizes the flowing liquid phase, realizing the efficient operation of the heat pipe and forming a heat pipe cycle.

[0036] The heat pipe condenser 1 at the hot end uses steam to flush the heat pipes, achieving heat exchange through phase change inside the heat pipes. Compared to traditional condensers, heat pipe condenser 1 involves phase change heat exchange both inside and outside the tubes, resulting in a significantly improved condensation coefficient. Furthermore, the inclined arrangement reduces condensate volume, further enhancing the condensation coefficient.

[0037] The novel heat pipe circuit differs completely from traditional loop heat pipes. This new loop heat pipe branches off a portion of the gas phase circuit, introducing a portion of the gas phase into the two-phase condensation pressurization mechanism, such as... Figure 2 As shown, by designing a Laval nozzle structure at the air inlet (vapor condensate inlet 9), the gas is accelerated, and its internal energy is converted into kinetic energy. It then enters the mixing chamber. Due to its high-speed and low-pressure characteristics, it draws the condensate from the condensation section into the mixing chamber. In the mixing chamber, the high-speed gas and the condensate come into full contact and condense, resulting in intense heat, mass, and momentum transfer phenomena. This generates a condensation shock wave, causing a sudden increase in pressure. The pressure near the condensation shock wave will be greater than that of the steam itself, thereby further converting the internal energy contained in the vapor and liquid phases into pressure energy. This increases the circulation speed of the condensate and further improves the efficiency of the heat pipe.

[0038] The conformal heat pipe 3 at the cold end is constructed to conform to the bulkhead 4 and embedded inside the bulkhead 4, achieving complete integration between the bulkhead 4 and the heat pipe heat exchanger. The heat pipe conducts heat to the wall surface, and then the heat is carried away by the external seawater flowing across the hull surface, thus achieving heat exchange at the cold end of the heat pipe. At the same time, the spiral channels on the wall surface can extend the contact area between the heat pipe and the wall surface, increase the area of ​​the heat pipe being washed by seawater, and improve the heat exchange capacity.

[0039] In summary, the novel surface-type sea-through cooling system based on a two-phase condensation pressurized heat pipe of the present invention has the following beneficial effects:

[0040] 1. It can eliminate seawater pumps and seawater pipelines, reduce the number of seawater equipment in the cabin, increase the usable volume inside the cabin, and reduce the risk of corrosion and leakage. At the same time, the present invention adopts a passive operation mode, which increases safety and reliability, eliminates kinetic components such as seawater pumps, reduces noise and energy consumption, and saves energy.

[0041] 2. By using the principle of condensation pressurization, the liquid return pressure inside the heat pipe can be increased, overcoming the disadvantage of low driving force of the heat pipe, solving the problem of difficult liquid replenishment in the evaporation section of the heat pipe, and improving the heat exchange capacity of the heat pipe.

[0042] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A surface-type sea-through cooling system based on a two-phase condensation pressurized heat pipe, characterized in that, include: Heat pipe condensers are installed inside the ship's hull. A vapor phase condensate main circuit pipeline, one end of which is connected to the outlet of the heat pipe condenser; A conformal heat pipe is conformally embedded in the interior of the hull's bulkhead. The inlet of the conformal heat pipe is connected to the other end of the main loop pipe for the vapor phase condensate. The conformal heat pipe can conduct heat to the surface of the bulkhead and carry away the heat by letting the outside seawater sweep across the surface of the hull. A liquid phase condensate loop pipe, one end of which is connected to the outlet of the conformal heat pipe; A two-phase condensation shock wave pressurization mechanism is installed in the hull. The liquid phase condensate inlet of the two-phase condensation shock wave pressurization mechanism is connected to the other end of the liquid phase condensate circuit pipe, and the two-phase mixed condensate outlet of the two-phase condensation shock wave pressurization mechanism is connected to the inlet of the heat pipe condenser. as well as A gas phase condensate branch loop pipe, one end of which is connected to the gas phase condensate main loop pipe, and the other end of which is used to connect to the gas phase condensate inlet of the two-phase condensation shock wave pressurization mechanism. The gas-phase condensate inlet of the two-phase condensation shock wave pressurization mechanism has a Laval nozzle structure to accelerate the incoming gas, converting its internal energy into kinetic energy, and then it enters the mixing chamber of the two-phase condensation shock wave pressurization mechanism. In this process, after the gas enters the mixing chamber, it is condensed in the confined space by the high-pressure airflow, generating a shock wave that injects and pressurizes the returning liquid condensate, thereby realizing heat pipe circulation.

2. The surface-type sea-through cooling system based on a two-phase condensation pressurized heat pipe as described in claim 1, characterized in that, The heat pipe condenser receives the exhaust steam from the turbine generator after it has finished working. By exchanging heat with the heat pipes inside the heat pipe condenser, the condensate inside the heat pipes evaporates to form a high-temperature gas phase. The gas enters the main circuit pipeline of the gas phase condensate through the outlet of the heat pipe condenser and is divided into two parts.

3. The surface-type sea-through cooling system based on a two-phase condensation pressurized heat pipe as described in claim 2, characterized in that, A portion of the gas enters the conformal heat pipe, and another portion of the gas enters the two-phase condensation shock wave pressurization mechanism.

4. The surface-type sea-through cooling system based on a two-phase condensation pressurized heat pipe as described in claim 3, characterized in that, The heat pipe condenser uses steam to flush the heat pipe, achieving heat exchange through phase change inside the heat pipe.

5. The surface-type sea-through cooling system based on a two-phase condensation pressurized heat pipe as described in claim 4, characterized in that, After a portion of the gas enters the conformal heat pipe, it exchanges heat with the external cold source seawater, thereby condensing into liquid condensate, which then flows back to the two-phase condensation shock wave pressurization mechanism through the liquid condensate loop pipe.

6. The surface-type sea-through cooling system based on a two-phase condensation pressurized heat pipe as described in claim 1, characterized in that, The conformal heat pipe has multiple spiral channels on its wall surface.

7. The surface-type sea-through cooling system based on a two-phase condensation pressurized heat pipe as described in claim 1, characterized in that, The heat pipe condenser is inclinedly disposed within the hull.

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