Refrigeration device for water jet propulsion ship and unmanned ship

Abstract

The refrigeration device comprises a heat exchanger and a water-jet propeller, the heat exchanger is provided with a water flow channel, and the water flow channel of the heat exchanger is communicated with a water flow pipeline of the water-jet propeller, so that water flow sucked by the water-jet propeller exchanges heat with the heat exchanger and then is sprayed out from a water outlet. The heat exchanger of the refrigerating device communicates with the water flow pipeline of the water-jet propeller, water flow formed in the sailing process of the water-jet propeller is used for cooling the condenser, integrated design of a propelling system and a refrigerating and cooling system is achieved, and the problems that a traditional independent condenser is large in size and heavy in weight are solved; and the structural complexity and the occupied space of the refrigerating system are obviously reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of marine refrigeration devices, in particular to a refrigeration device for a waterjet propelled ship and an unmanned ship. BACKGROUND

[0002] With the continuous rise of global cold chain logistics demand, unmanned ships have become a new carrier for island fresh food distribution and port short-distance transportation due to their low water transportation cost and environmental friendliness. However, traditional refrigeration devices are not suitable for direct application on small unmanned ships. For example, independent condensers are large in size and heavy in weight, which seriously squeezes the limited load weight of the ship and hinders its large-scale application in high-frequency, small-batch and personalized distribution. SUMMARY

[0003] To solve at least one of the above technical problems, on the one hand, the present application provides a refrigeration device for a waterjet propelled ship, so that the water flow of the waterjet propeller flows through the heat exchanger to exchange heat with the heat exchanger, thereby simplifying the structure and reducing the volume of the heat exchanger, and releasing the valuable space and loading capacity of the ship.

[0004] On the other hand, the present application also provides an unmanned ship with the refrigeration device.

[0005] The technical solution adopted by the present application is to design a refrigeration device for a waterjet propelled ship, which comprises a heat exchanger and a waterjet propeller. The heat exchanger is provided with a water flow channel, and the water flow channel of the heat exchanger is in communication with the water flow pipeline of the waterjet propeller, so that the water flow sucked by the waterjet propeller is exchanged with the heat exchanger and then sprayed out of the water outlet.

[0006] In some embodiments, the water flow channel of the heat exchanger is in communication with a drain valve.

[0007] In some embodiments, a temperature sensor for detecting the water outlet temperature of the waterjet propeller is further included.

[0008] In some embodiments, the water outlet of the waterjet propeller is provided with a control valve.

[0009] In some embodiments, the heat exchanger is provided with a refrigerant flow channel, and the refrigerant flow channel and the water flow channel are filled with a heat-conducting liquid.

[0010] In some embodiments, the heat exchanger is a condenser.

[0011] The unmanned ship comprises the refrigeration device for a waterjet propelled ship.

[0012] In some embodiments, the water flow channel of the heat exchanger is in communication with a drain pipeline of the ship side, and the drain pipeline is provided with a drain valve.

[0013] In some embodiments, the refrigeration device is used to control the temperature of a refrigerated container for storing goods.

[0014] In some embodiments, the refrigerated container is located on a rack, and the heat exchanger is located below the rack.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] The present application realizes the integrated design of the propulsion system and the refrigeration and heat dissipation system by connecting the heat exchanger of the refrigeration device with the water flow pipeline of the water jet thruster, using the water flow formed by the water jet thruster during navigation to provide cooling for the condenser, avoids the problem of large volume and heavy weight of the traditional independent condenser, and significantly reduces the structural complexity and space occupation of the refrigeration system. By setting the drain valve, water jet opening control valve and drain water temperature sensor, the adjustable and adaptive control of the condenser heat dissipation water quantity is realized, and the heat dissipation capacity and operation stability under high load conditions are improved without affecting the propulsion performance of the ship. The indirect heat exchange structure filled with environmentally friendly heat conducting liquid between the refrigerant flow channel and the water flow channel is adopted, which improves the safety and environmental protection of the system, and avoids the pollution of water body caused by refrigerant leakage. The overall scheme fully releases the limited load and cabin space of the unmanned ship, improves the energy efficiency, reliability and application adaptability of the cold chain transportation unmanned ship in the high frequency and small batch transportation scene. BRIEF DESCRIPTION OF DRAWINGS

[0017] The present application will be described in detail below with specific embodiments and accompanying drawings. In order to show details, facilitate understanding of principles, it is not necessarily drawn to scale, and similar reference numerals can describe similar components in different views. The accompanying drawings generally show embodiments discussed herein in an exemplary and non-limiting manner. Among them:

[0018] Figure 1 is a schematic diagram of an unmanned ship.

[0019] Figure 2 is a schematic diagram of a condenser.

[0020] Figure 3 is a schematic diagram of a refrigeration system.

[0021] Figure 4 is a schematic diagram of a control unit.

[0022] Figure 5 is a schematic diagram of the control logic of an unmanned ship.

[0023] In the drawings,

[0024] 1, condenser;

[0025] 11, water flow channel;

[0026] 12. Refrigerant flow channel;

[0027] 13. Heat transfer fluid;

[0028] 2. Water pipes;

[0029] 3. Water pump;

[0030] 4. Drainage outlet;

[0031] 5. Drain valve;

[0032] 6. Temperature sensor;

[0033] 7. Control valve;

[0034] 8. Drainage pipe;

[0035] 9. Refrigeration containers;

[0036] 10. Shelves;

[0037] 21. Compressor;

[0038] 22. Evaporator;

[0039] 23. Throttling valve;

[0040] 24. Four-way valve;

[0041] 25. Oil-gas separator. Detailed Implementation

[0042] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments, and the following embodiments do not limit the invention covered by the claims. Furthermore, not all combinations of the features described in the embodiments are necessary for the inventive solution.

[0043] The principles and structure of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0044] Example

[0045] like Figure 1 , 2As shown, the refrigeration device for a waterjet-propelled vessel includes a heat exchanger and a waterjet propulsion unit. The heat exchanger has a water flow channel 11, which connects to the water flow pipe 2 of the waterjet propulsion unit. This allows the water drawn in by the waterjet propulsion unit to exchange heat with the heat exchanger and then be sprayed out from the drain port 4. In this embodiment, the waterjet-propelled vessel is an unmanned surface vessel (USV) used for cold chain transportation, specifically for the rapid transport of goods such as seafood requiring low-temperature preservation. Therefore, the USV needs refrigeration equipment, such as cold storage or refrigerators, capable of generating low temperatures. The heat exchanger is the condenser 1 of the USV's refrigeration equipment. The water jet from the waterjet propulsion unit flows through the condenser 1 and is then discharged, providing propulsion power to the USV while simultaneously dissipating heat from the condenser 1, thus facilitating the cooling of the refrigeration equipment. The waterjet propulsion unit includes a water pump 3 for drawing water from the bottom of the vessel and a waterjet propulsion device for discharging the drawn water from the stern drain port 4. The condenser 1 is located on the pipeline between the water pump 3 and the drain port 4.

[0046] In other words, the refrigeration device, by configuring the heat exchanger of the refrigeration equipment to be connected to the water flow pipe 2 of the water jet propulsion unit, allows the ambient water drawn in by the water jet propulsion unit during navigation to preferentially flow through the water flow channel 11 inside the heat exchanger and exchange heat with the refrigerant circuit inside the heat exchanger, absorbing the heat generated by the refrigeration equipment during condensation, and then spraying it out through the drain port 4 of the water jet propulsion unit. Since the water jet propulsion unit itself has a continuous, stable, and large-flow water flow during operation, this water flow can serve as the cooling medium on the condensing side without additional power, thus replacing the traditional independent condenser 1 and its matching fan or water pump 3, achieving integrated propulsion and heat dissipation functions. This structure significantly simplifies the heat exchanger structure of the refrigeration system, reduces the volume and weight of the condenser 1, lowers system energy consumption and structural complexity, and effectively frees up the limited internal space and payload capacity of the unmanned surface vessel (USV). Simultaneously, utilizing the water flow for efficient heat dissipation during navigation improves the condensation efficiency and operational stability of the refrigeration equipment, meeting the application requirements of the USV for lightweight, high reliability, and high energy efficiency in high-frequency, small-batch cold chain transportation scenarios.

[0047] Furthermore, the water flow channel 11 of the heat exchanger is connected to a drain valve 5. When the condenser 1 requires a larger water flow for heat dissipation without changing the ship's propulsion speed, the drain valve 5 can be opened. Simultaneously, the power of the waterjet propulsion system is increased to draw in more water through the intake port, causing some water to be discharged from the drain valve 5. This ensures the water pressure at the waterjet propulsion nozzle while accelerating the water flow speed within the condenser 1, thereby speeding up heat dissipation. The drain valve 5 can be simply a solenoid valve or flow control valve 7 that controls the amount of discharge.

[0048] In other words, a drain valve 5 connected to the outside is provided on the water flow channel 11 of the heat exchanger, so that the water flow inside the heat exchanger forms an adjustable diversion structure. Under conditions where the heat dissipation demand of the condenser 1 increases, such as when the ambient temperature is high or the cooling load increases, without changing the propulsion speed and navigation attitude of the unmanned surface vessel, the drain valve 5 is opened and the working power of the water jet propulsion is increased accordingly, thereby increasing the total amount of water drawn into the intake port. Among them, a part of the water flow is ejected through the nozzle of the water jet propulsion to maintain the predetermined propulsion water pressure, and the other part of the water flow is discharged through the water flow channel 11 of the heat exchanger and through the drain valve 5, thereby significantly increasing the water flow rate and velocity inside the condenser 1. The above structure enables the condenser 1 to independently adjust the heat exchange intensity on the condensing side while maintaining the stable operation of the propulsion system, enhance the convective heat transfer effect on the water side, accelerate the heat removal speed, effectively improve the heat dissipation capacity and operational reliability of the refrigeration device under high load conditions, avoid the increase in energy consumption or changes in control performance caused by simply increasing the propulsion speed, and further enhance the adaptability and practical value of the refrigeration device in the application of unmanned surface vessel cold chain transportation.

[0049] Furthermore, it also includes a temperature sensor 6 for detecting the drainage temperature of the water jet propulsion unit. For example, a temperature sensor 6 can be installed on the pipeline between the water jet propulsion unit drain outlet 4 and the condenser 1 to detect the water flow temperature after being heated by the condenser 1, and to control the discharge size of the drain valve 5 according to the temperature.

[0050] In other words, the refrigeration device also includes a temperature sensor 6 for detecting the discharge temperature of the waterjet propulsion system. The temperature sensor 6 is installed on the pipeline between the waterjet propulsion outlet 4 and the condenser 1, and is used to detect the temperature change of the water after heat exchange in the condenser 1 in real time. Based on the discharge temperature signal collected by the temperature sensor 6, the control unit adjusts the opening state of the drain valve 5: when an increase in discharge temperature is detected, indicating an increase in the heat exchange load of the condenser 1, the control unit increases the opening degree of the drain valve 5 to increase the water volume and flow rate through the water flow channel 11 of the condenser 1, thereby enhancing the water-side heat exchange capacity and accelerating heat dissipation; when the discharge temperature is low and the heat dissipation demand is reduced, the drain valve 5 is reduced or closed to reduce unnecessary water diversion and maintain the overall efficiency of the propulsion system. Through the combination of temperature feedback and drain regulation, the adaptive adjustment of the condenser 1's heat dissipation capacity is achieved. While ensuring stable propulsion performance of the waterjet propulsion system, the operating efficiency and reliability of the refrigeration system under different operating conditions are improved, further enhancing the intelligence and practicality of the refrigeration device in unmanned surface vessel cold chain transportation applications.

[0051] like Figure 4As shown, the control unit or controller mentioned here refers to an electronic device or other device or system capable of automated control (such as the drain valve 5, water jet propulsion device, etc.) that can control other devices by processing and judging the received signal (the signal from temperature sensor 6) or instructions through software. For example, the control unit can be a central processing unit (CPU), microcontroller unit (MCU), system on chipset (SoC), application-specific integrated circuit (ASIC), programmable logic device (PLD), microcontroller, industrial control computer, or a combination thereof. Of course, using the control unit to control the operation of another device based on the detection signal of the sensor is a basic existing technology in the field of automation, and the specific circuit connection will not be described in detail here.

[0052] Furthermore, the water jet propulsion outlet 4 is equipped with a control valve 7 to control the size of the water jet flow, so that it can be used in conjunction with the drain valve 5.

[0053] In other words, a control valve 7 for adjusting the size of the jet water flow is installed at the drain outlet 4 of the waterjet propulsion unit. This control valve 7 works in conjunction with the aforementioned drain valve 5 to achieve precise control of the water flow distribution. During actual operation, when the drain valve 5 is opened to improve the heat dissipation capacity of the condenser 1, the opening of the jet nozzle can be limited by adjusting the control valve 7. This ensures that the pressure and flow rate of the jet water flow remain within the range required for propulsion, even with an increase in total water intake. Conversely, when the heat dissipation demand is low, the opening of the jet nozzle is increased while the opening of the drain valve 5 is decreased, allowing more water to be used for propulsion and reducing diversion losses. By installing the control valve 7 at the drain outlet 4 of the waterjet propulsion unit and using it in conjunction with the drain valve 5, controllable distribution between the propulsion water flow and the cooling water flow of the condenser 1 is achieved. This allows the propulsion system and the cooling and heat dissipation system to be adjusted independently yet collaboratively, balancing propulsion efficiency and heat dissipation under different speeds and cooling loads. This further enhances the operational stability, energy efficiency, and environmental adaptability of the entire ship system.

[0054] Furthermore, the heat exchanger is equipped with a refrigerant flow channel 12, and the space between the refrigerant flow channel 12 and the water flow channel 11 is filled with a heat-conducting fluid 13. This fluid is separated from the refrigerant pipe by an environmentally friendly heat-conducting fluid 13, ensuring that there will be no refrigerant leakage in the event of a pipe rupture. The heat-conducting fluid 13 is preferably an environmentally friendly type, thus avoiding environmental pollution after leakage. The risk of refrigerant leakage is significant. Existing solutions generally use an independent condenser 1 design where the refrigerant pipe is directly connected to the water circuit. When the pipe ruptures, the refrigerant leaks into the water, not only damaging the nearshore ecosystem but also directly violating the mandatory requirements of the Montreal Protocol. Utilizing the water jet propulsion system's inlet pipe as the condenser 1, separated from the refrigerant pipe by an environmentally friendly heat-conducting fluid 13, ensures that there will be no refrigerant leakage in the event of a pipe rupture. The environmentally friendly heat-conducting fluid 13 physically isolates the refrigerant from the water circuit, ensuring that even if the pipe ruptures, only a harmless liquid leaks, completely eliminating refrigerant pollution and ensuring that the unmanned surface vessel (USV) operation meets environmental protection requirements. A simple heat-conducting fluid 13 can be deionized water or softened water.

[0055] In other words, the heat exchanger is internally equipped with a refrigerant flow channel 12 for refrigerant flow. The refrigerant flow channel 12 and the water flow channel 11 are not in direct contact; instead, a heat-conducting liquid 13 fills the space between them, forming an indirect heat exchange structure. The heat-conducting liquid 13, as a heat transfer medium, effectively transfers heat between the refrigerant flow channel 12 and the water flow channel 11, ensuring the heat exchange efficiency of the condenser 1. Furthermore, by physically isolating the refrigerant from the water flow, it prevents direct leakage of refrigerant into the water due to refrigerant pipe rupture or seal failure. The heat-conducting liquid 13 is preferably an environmentally friendly type, ensuring no pollution to the external water environment even when the drain valve 5 is opened for drainage. Through this structural design, the system's safety and environmental friendliness are significantly improved while maintaining the heat dissipation performance of the condenser 1. This reduces the environmental risks and maintenance costs of the unmanned surface vessel during long-term operation and in complex water conditions, making it particularly suitable for applications requiring high environmental friendliness and operational reliability, such as cold chain transportation.

[0056] Furthermore, the water flow channel 11 connecting the heat exchanger is connected to the drain pipe 8 on the side of the ship. The drain pipe 8 is equipped with the drain valve 5, so that the water flow discharged from the drain valve 5 is discharged from the side of the ship.

[0057] In other words, the water flow channel 11 of the heat exchanger is also connected to the side of the hull through a drain pipe 8. A drain valve 5 is installed on the drain pipe 8, allowing water flowing from the heat exchanger's water flow channel 11 to be directly discharged from the side of the hull via the drain pipe 8 when the drain valve 5 is opened. In this structure, the discharged water flow no longer passes through the jet channel of the waterjet propulsion system, thus avoiding adverse effects on the water pressure and flow pattern of the propulsion jet. By arranging the drain outlet on the side of the hull, the discharge path can be shortened, reducing pipe resistance and structural complexity. Simultaneously, it facilitates the rapid discharge of the discharged water and its thorough mixing with external water, preventing localized heat or pressure accumulation. This configuration enables the drain valve 5 to have a higher response speed and adjustment accuracy when regulating the heat dissipation water volume of the condenser 1, further improving the heat dissipation capacity, operational stability, and overall system reliability of the refrigeration unit under different operating conditions. This design is suitable for waterjet propulsion vessels with high requirements for space utilization and system integration, such as unmanned surface vessels used for cold chain transportation.

[0058] Furthermore, it also includes a shelf 10 located on the unmanned surface vessel and a refrigerated container 9 for storing cargo. The refrigerated container 9 is located on the shelf 10, and the heat exchanger is located below the shelf 10. The refrigeration device is used to control the temperature of the refrigerated container 9. The refrigerated container 9 is similar to a refrigerator with multiple cargo compartments. The condenser 1 mentioned above is the condenser 1 of the refrigerator's refrigeration system, except that it is located on the pipeline of the water jet propulsion unit outside the refrigerator. The condenser 1 is connected to the refrigerator's refrigeration system through a refrigerant communication pipeline. Figure 3 As shown, the most basic refrigerator refrigeration system typically includes a compressor 21, an evaporator 22, a throttle valve 23, a four-way valve 24, an oil-gas separator 25, and a condenser 1.

[0059] In other words, the unmanned surface vessel (USV) is also equipped with a cargo rack 10 and a refrigerated container 9 mounted on the rack 10. The refrigerated container 9 is used to store goods requiring low-temperature preservation. The heat exchanger is located in the space below the rack 10 and is connected to the refrigeration system of the refrigerated container 9 for controlling the refrigeration temperature of the refrigerated container 9. The refrigerated container 9 can have a refrigerator-like structure, with multiple independent cargo compartments inside to accommodate the classification, storage, and temperature management needs of different goods. Correspondingly, the heat exchanger, acting as the condenser 1 of the refrigeration system of the refrigerated container 9, is not located in the conventional position on the outer shell of the refrigerated container 9, but is integrated into the water jet propulsion system of the USV, allowing the condenser 1 to achieve efficient heat dissipation through the water flow drawn in and discharged by the water jet propulsion system. By arranging the condenser 1 below the rack 10 and combining it with the propulsion waterway, the limited longitudinal space of the unmanned surface vessel is fully utilized, the volume and weight of the refrigerated container 9 are reduced, the utilization rate of the cabin space and the overall cargo capacity are improved, and the refrigerated container 9 is guaranteed to have stable and reliable refrigeration performance during navigation. This is suitable for the modular and lightweight layout requirements of unmanned surface vessels for cold chain transportation.

[0060] like Figure 5 As shown, combined with the above-mentioned equipment, the control method for the unmanned surface vessel can be carried out as follows:

[0061] First, power is turned on to start the unmanned boat. The unmanned boat calculates the water pressure on the water jet propulsion side and the water pump operating frequency according to the command to move or stop.

[0062] When the power is first turned on, the water pump starts at the set default frequency to raise the water pressure on the nozzle side to the set value. Once the set value is reached, the water pump shuts off; otherwise, it continues to operate.

[0063] Next, determine whether the water temperature in the condenser is higher than the set value. If it is higher, open the drain valve on the side of the ship to accelerate the water flow in the condenser and improve the heat exchange efficiency. The drain valve is closed when the water temperature is lower than the set value.

[0064] When the drain valve is opened and the water pressure on the spray side begins to decrease, the water pump will turn on to the maximum. When the set value is reached, the water pump frequency will return to system control.

[0065] Next, determine whether the water temperature in the condenser cannot drop for a long time. If so, control the refrigeration system to enter standby mode to prevent the discharged water temperature from being too high. Otherwise, the condenser will be turned on normally.

[0066] Then it returns to judging whether the water pressure on the water jet propulsion side has reached the set value and enters the next loop.

[0067] The specific embodiments described herein are merely illustrative examples illustrating the spirit of the invention. Those skilled in the art can make various modifications or additions to the described embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0068] Although this document uses a number of technical terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention. The order of actions, steps, etc., in the apparatus and methods shown in the specification and drawings can be implemented in any order unless otherwise expressly specified, and provided that the output of a preceding process is not used in a subsequent process. Similar sequential terms used for descriptive convenience (e.g., "firstly," "next," "secondly," "again," "then," etc.) do not imply that the actions must be performed in such an order.

[0069] Those skilled in the art will understand that all directional references (e.g., above, below, up, down, down, top, bottom, left, right, vertical, horizontal, etc.) are used descriptively in the drawings to aid the reader's understanding and do not imply (e.g., a limitation on the scope of the invention as defined by the appended claims) a limitation on the location, orientation, or use of the invention, but are merely for the purpose of facilitating the description of this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation. The directional terms "inside" and "outside" refer to inside or outside relative to the outline of the respective component itself.

[0070] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0071] Additionally, some vague terms (e.g., substantially, certain, generally, etc.) may refer to slight inaccuracies or minor deviations in conditions, quantities, values, or dimensions, some of which are within manufacturing tolerances or limits. It should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components; unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

Claims

1. A refrigeration device for a waterjet-propelled vessel, comprising a heat exchanger and a waterjet propulsion unit, wherein the heat exchanger is provided with a water flow channel, characterized in that, The water flow channel of the heat exchanger is connected to the water flow pipe of the water jet propulsion device, so that the water flow drawn in by the water jet propulsion device exchanges heat with the heat exchanger and is then sprayed out from the drain outlet.

2. The refrigeration device for a waterjet-propelled ship according to claim 1, characterized in that, The water flow channel of the heat exchanger is connected to a drain valve.

3. The refrigeration device for a waterjet-propelled ship according to claim 2, characterized in that, It also includes a temperature sensor for detecting the temperature of the water jet propulsion system's exhaust water.

4. The refrigeration device for a waterjet-propelled ship according to claim 2, characterized in that, The water jet propulsion device is equipped with a control valve at its drain outlet.

5. The refrigeration device for a waterjet-propelled ship according to claim 1, characterized in that, The heat exchanger is provided with a refrigerant flow channel, and the space between the refrigerant flow channel and the water flow channel is filled with a heat-conducting liquid.

6. The refrigeration device for a waterjet-propelled vessel according to claim 1, characterized in that, The heat exchanger is a condenser.

7. An unmanned surface vessel, characterized in that, Includes a refrigeration device for a waterjet propulsion vessel as described in any one of claims 1 to 6.

8. The unmanned surface vessel according to claim 7, characterized in that, It also includes a water flow channel connecting the heat exchanger to a drain pipe on the side of the ship, and the drain pipe is equipped with a drain valve.

9. The unmanned surface vessel according to claim 7, characterized in that, It also includes refrigerated containers for storing goods, wherein the refrigeration device is used to control the temperature of the refrigerated containers.

10. The unmanned surface vessel according to claim 9, characterized in that, The refrigerated container is located on the shelf, and the heat exchanger is located below the shelf.

Images