Ship, fresh air exchange system for a ship, and method

Abstract

This invention relates to the field of marine ventilation technology, and discloses a ship, a fresh air exchange system for ships, and an exchange method. The system includes a ventilation duct installed inside the ship's cabin, with ventilation grilles on the duct and a temperature sensor on its outer side; a first air inlet duct, one end of which is connected to the outside of the cabin and the other end to the ventilation duct, with a fan installed inside; a second air inlet duct, one end of which is also connected to the outside of the cabin and the other end to the ventilation duct, with a sealing gate at its inlet; and a controller electrically connected to the temperature sensor, the fan, and the sealing gate, which adjusts the opening and closing of the fan and the sealing gate based on the temperature sensor readings. This application ensures efficient ventilation and heat dissipation in the cabin by switching the operating mode of the fresh air system under different conditions, avoiding energy waste caused by continuous operation of traditional fans, while ensuring stable temperature and humidity inside the cabin and improving the ship's energy utilization rate.

Description

Technical Field

[0001] This invention relates to the field of marine ventilation technology, and in particular to a ship, a fresh air exchange system for a ship, and a method thereof. Background Technology

[0002] During ship operation, the cabin ventilation system is a crucial facility for maintaining environmental comfort and safety. Traditional ship ventilation systems generally use mechanical fans to force the exchange of outside air with cabin air to achieve heat exchange and fresh air replenishment. However, existing technology has the following core drawbacks: Traditional ventilation system fans typically operate with constant parameters, continuously working at full load power regardless of changes in the external ambient temperature. This mode results in a large amount of ineffective energy consumption even when the external temperature is suitable or high-intensity ventilation is not required, failing to achieve on-demand adjustment, leading to energy waste and high carbon emissions. Although some improved solutions introduce variable frequency fans to adjust fan speed through temperature feedback to reduce energy consumption, their design is still limited to a passive mechanical ventilation framework, still driving air exchange through active energy consumption, and still generating a large amount of ineffective energy consumption; in addition, ventilation and heat exchange in the cabin are generally achieved by installing fans in a single vent, which may create heat exchange dead zones with high or low points, causing uneven heat distribution inside the cabin and affecting the ventilation and heat dissipation efficiency of the cabin. Summary of the Invention

[0003] The purpose of this invention is to provide a ship, a fresh air exchange system and method for ships, to prevent uneven heat distribution inside the cabin, to switch the operation mode of the fresh air system under different conditions, to avoid energy waste caused by continuous operation of traditional fans, and to ensure the stability of temperature and humidity inside the cabin, thereby improving the energy utilization rate of the ship.

[0004] To achieve the above objectives, the present invention provides a fresh air exchange system for ships, comprising:

[0005] A ventilation duct is installed inside the cabin. A temperature sensor is installed on the outside of the ventilation duct. The ventilation duct includes multiple ventilation sections, the diameter of which gradually decreases from high to low. Each ventilation section is provided with at least one ventilation grille. A first air inlet duct is connected at one end to the outside of the cabin and at the other end to the ventilation duct. A fan is installed inside the first air inlet duct.

[0006] The second air intake duct has one end connected to the outside of the cabin and the other end connected to the ventilation duct. The inlet of the second air intake duct is equipped with a sealing gate.

[0007] A controller is electrically connected to the temperature sensor, the fan, and the sealing gate. The controller adjusts the opening and closing of the fan and the sealing gate according to the temperature sensor.

[0008] Compared with existing technologies, the fresh air exchange system for ships according to this invention has the following advantages: In this application, fresh air enters the ventilation duct through a first air inlet and a second air inlet, and then enters the cabin through ventilation grilles on the ventilation duct. The ventilation duct is equipped with multiple ventilation sections with gradually decreasing diameters, each with its own ventilation grille. These grilles ensure that fresh air is evenly distributed to each height of the cabin. The gradually decreasing diameter of the ventilation sections prevents excessive fan force from directly suppressing the fresh air at the bottom of the ventilation duct, ensuring sufficient fresh air is distributed to each height of the ventilation section, preventing uneven heat distribution within the cabin, and guaranteeing efficient ventilation and heat dissipation. The first air inlet is driven by a fan, accelerating the airflow into the ventilation duct. The second air inlet is for natural air intake, utilizing the natural wind during ship movement for passive ventilation of the cabin. A sealing gate is installed in the second air inlet to control its opening and closing. The controller monitors external environmental parameters in real time based on temperature sensors, and can intelligently determine whether to activate the second or first air inlet. The controller is pre-programmed with the desired cabin temperature. When the cabin temperature is significantly higher than the desired temperature, the controller opens both the fan and the sealing gate to accelerate ventilation and heat exchange. Conversely, when the temperature difference between the cabin temperature and the desired temperature is small, the system prioritizes opening the sealing gate and shutting down the fan, utilizing the natural pressure difference generated by external airflow during ship navigation for passive ventilation. This achieves cabin air replacement without additional energy consumption, significantly reducing the ineffective operation time of the fan. This application switches the operation mode of the fresh air system under different conditions, avoiding the energy waste caused by continuous operation of traditional fans, while ensuring the stability of cabin temperature and humidity and improving the ship's energy utilization rate.

[0009] The fresh air exchange system for ships according to an embodiment of the present invention includes a controller comprising a temperature control unit connected to the temperature sensor;

[0010] The fan includes a variable frequency fan, and the temperature control unit is also connected to the variable frequency fan to adjust the speed of the variable frequency fan according to the temperature data.

[0011] In the fresh air exchange system for ships according to embodiments of the present invention, a first check valve is provided on the side of the fan facing the ventilation duct to prevent fresh air from flowing back into the first air inlet duct.

[0012] In the fresh air exchange system for ships according to an embodiment of the present invention, a second check valve is provided in the second air inlet duct.

[0013] In the fresh air exchange system for ships according to embodiments of the present invention, a structural air box is provided at the top of the second air inlet duct, the structural air box is connected to the second air inlet duct, and a ventilation grille connected to the outside is provided on the side surface of the structural air box.

[0014] The fresh air exchange system for ships according to an embodiment of the present invention has an inspection door on one side of the structural air box, and a grid platform for walking is laid at the bottom of the structural air box.

[0015] In the fresh air exchange system for ships according to embodiments of the present invention, the diameter of the ventilation grille is d, and the diameter of the ventilation section in which it is located is D, wherein the ratio of d to D is d≥1 / 2D.

[0016] The present invention also provides a ship, including a cabin, wherein a plurality of fresh air exchange systems for ships as described in any of the above embodiments are provided in the cabin.

[0017] Compared with existing technologies, the beneficial effects of this embodiment of the invention for ships are as follows: multiple automatically adjustable fresh air exchange systems for ships are set up, and the operation mode of the fresh air system is switched according to different conditions, avoiding energy waste caused by continuous operation of traditional fans, while ensuring the stability of temperature and humidity inside the cabin and improving the energy utilization rate of the ship.

[0018] The present invention also provides a method for fresh air exchange in ships, employing the fresh air exchange system for ships described in any of the above embodiments, comprising the following steps:

[0019] Multiple node temperatures are preset within the controller, and the node temperatures are determined based on the current outdoor temperature.

[0020] The temperature sensor detects the temperature inside the cabin and transmits the temperature data to the controller.

[0021] The controller adjusts the fan and the sealing gate by comparing the temperature data with the node temperature.

[0022] Compared with existing technologies, the fresh air exchange method for ships proposed in this invention has the following advantages: The controller monitors environmental parameters inside the cabin in real time based on temperature sensors, and can intelligently determine whether to activate the second or first air intake. When the cabin temperature is significantly higher than the required cabin temperature, the controller opens both the fan and the sealing gate to accelerate ventilation and heat exchange. When the cabin temperature is close to the required cabin temperature, the system prioritizes opening the sealing gate and shutting down the fan, directly utilizing the natural pressure difference generated by external airflow during ship navigation to achieve passive ventilation. This completes cabin air replacement without additional energy consumption, significantly reducing the ineffective operation time of the fan. This application avoids energy waste caused by the continuous operation of traditional fans by switching the operation mode of the fresh air system under different conditions, while ensuring the stability of cabin temperature and humidity and improving the ship's energy utilization rate.

[0023] The method for fresh air exchange in ships according to embodiments of the present invention,

[0024] The node temperature includes at least a first temperature and a second temperature;

[0025] When the temperature data is greater than the first temperature, the controller controls the fan and the sealing gate to open to maximize ventilation;

[0026] When the temperature data is greater than the second temperature and less than the first temperature, the controller controls the fan to shut down, the sealing gate to open, and air to enter through the second air inlet duct.

[0027] When the temperature data is lower than the second temperature, the controller controls the fan and the sealing gate to close, stopping the ventilation of the fresh air exchange system.

[0028] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a fresh air exchange system for ships according to an embodiment of the present invention;

[0030] Figure 2 This is a top view of the air exchange system for ships according to an embodiment of the present invention;

[0031] In the diagram, 1 is the ventilation duct; 11 is the ventilation grille; 12 is the ventilation section; 2 is the first air inlet duct; 21 is the fan; 22 is the first check valve; 3 is the second air inlet duct; 31 is the sealing gate; 32 is the second check valve; 4 is the controller; 5 is the temperature sensor; 6 is the structural air box; 61 is the air inlet grille; 62 is the detection door; and 63 is the grille platform. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0033] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0034] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0035] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0036] like Figure 1 and Figure 2 As shown, a preferred embodiment of the present invention provides a fresh air exchange system for ships, including a ventilation duct 1, which is vertically installed inside the cabin. The ventilation duct 1 has ventilation grilles 11 to deliver fresh air into the cabin. Specifically, the ventilation duct 1 includes multiple ventilation sections 12, with the diameter of each ventilation section 12 gradually decreasing from high to low. Each ventilation section 12 is provided with at least one ventilation grille 11. The ventilation duct 1 has multiple ventilation sections 12 with gradually decreasing diameters, and each ventilation section 12 has an individual ventilation grille 11. Through the ventilation grilles 11, fresh air from outside can be evenly delivered to each height of the cabin. The gradually decreasing ventilation sections 12 can prevent fresh air from being directly forced to the bottom of the ventilation duct 1 due to excessive fan force, ensuring that each height of the ventilation section 12 can be allocated sufficient fresh air, preventing uneven heat distribution inside the cabin, and ensuring the ventilation and heat dissipation efficiency of the cabin.

[0037] A temperature sensor 5 is installed on the outside of the ventilation duct 1 to detect the temperature inside the cabin. A drain plug is installed at the bottom of the ventilation duct 1 to drain water that has entered the ventilation duct 1 when needed. A first air inlet duct 2 is connected to the top of the ventilation duct 1. One end of the first air inlet duct 2 is connected to the outside of the cabin, and the other end is connected to the ventilation duct 1, which can transmit fresh air from outside the cabin into the ventilation duct 1. A fan 21 is installed inside the first air inlet duct 2 to create a pressure difference on both sides of the first air inlet duct 2, increase the air speed inside the first air inlet duct 2, and improve the air intake efficiency of the first air inlet duct 2.

[0038] The top of the ventilation duct 1 is also connected to the second air inlet duct 3. Specifically, the first air inlet duct 2, the second air inlet duct 3 and the ventilation duct 1 form a Y-shaped structure. The first air inlet duct 2 and the second air inlet duct 3 are both connected to the top of the ventilation duct 1. One end of the second air inlet duct 3 is connected to the outside of the cabin. The inlet of the second air inlet duct 3 is also equipped with a sealing gate 31. When the sealing gate 31 is opened, the second air inlet duct 3 can convert the wind pressure generated during the movement of the hull into natural ventilation driving force, so that natural wind enters the second air inlet duct 3. The cabin air is refreshed without additional energy consumption, which solves the problem that the existing technology requires the fan 21 to actively consume energy to replace the air.

[0039] The cabin is also equipped with a controller 4, which is electrically connected to a temperature sensor 5, a fan 21, and a sealing gate 31. The controller 4 adjusts the opening and closing of the fan 21 and the sealing gate 31 based on the temperature sensor 5. During operation, fresh air enters the ventilation duct 1 through the first air intake duct 2 and the second air intake duct 3, and then enters the cabin through the ventilation grille 11 on the ventilation duct 1. The first air intake duct 2 is driven by the fan 21, allowing air to enter the ventilation duct 1 more quickly. The second air intake duct 3 is a natural intake, utilizing the natural wind generated during the ship's movement for passive ventilation of the cabin. A sealing gate 31 is installed in the second air intake duct 3 to control its opening and closing. The controller 4 monitors external environmental parameters in real time based on the temperature sensor 5, and can intelligently determine whether to activate the second air intake duct 3 or the first air intake duct 2. When the temperature difference between the cabin interior and the required temperature is large, controller 4 opens both fan 21 and sealing gate 31 to accelerate ventilation and heat exchange. Conversely, when the temperature difference is small, the system prioritizes opening sealing gate 31 and shutting down fan 21, utilizing the natural pressure difference generated by external airflow during ship navigation for passive ventilation. This achieves cabin air replacement without additional energy consumption, significantly reducing the ineffective operating time of fan 21. This application switches the operating mode of the fresh air system under different conditions, avoiding energy waste caused by continuous operation of traditional fans, while ensuring cabin temperature and humidity stability and improving the ship's energy utilization rate.

[0040] In some embodiments of the present invention, the controller 4 includes a temperature control unit connected to a temperature sensor 5 to receive temperature data inside the cabin; the fan 21 includes a variable frequency fan 21, and the temperature control unit is also connected to the variable frequency fan 21 to adjust the speed of the variable frequency fan 21 according to the temperature data; the temperature control unit is used to collect temperature data inside and outside the cabin in real time, and dynamically match the optimal speed of the variable frequency fan 21 through a preset algorithm. Specifically, when the external temperature and the required temperature inside the cabin are large, the variable frequency fan 21 is driven to operate at high speed to increase the fresh air volume; while when the external temperature and the required temperature inside the cabin are small and the second air inlet duct 3 cannot fully meet the ventilation requirements, the controller 4 prioritizes operating the variable frequency fan 21 in a low-speed mode, only supplementing the necessary fresh air volume. Compared with the constant speed mode of the traditional fan 21, this can reduce mechanical ventilation energy consumption. Furthermore, the temperature control unit can also calculate the temperature difference gradient between the inside and outside of the cabin based on the temperature data, and generate non-linear speed regulation commands for the variable frequency fan 21 accordingly. This breaks through the crude adjustment mode of traditional variable frequency solutions that rely solely on a single temperature threshold. While ensuring the uniformity of the cabin temperature, it avoids the additional energy loss and damage to the fan 21 caused by frequent start-stop or sudden speed changes of the fan 21.

[0041] In some embodiments of the present invention, a first check valve 22 is provided on the side of the fan 21 facing the ventilation duct 1 to prevent fresh air from flowing back into the first air inlet duct 2. The first check valve 22 is located at the connection between the outlet of the fan 21 and the ventilation duct 1. The first check valve 22 has a one-way flow guiding function. Through the one-way flow guiding ventilation design, it can completely block the backflow of high-pressure gas in the cabin into the first air inlet duct 2 caused by sudden changes in external wind pressure (such as a ship making a sharp turn or encountering strong crosswinds). In addition, when the system switches to the mode of only passing through the second air inlet duct 3, the first check valve 22 remains in a one-way closed state after the fan 21 stops, forming a physical isolation barrier to prevent natural airflow from leaking back through the first air inlet duct 2. It can also prevent bearing wear caused by the impeller of the fan 21 spinning idly due to reverse force, thus ensuring the service life of the fan 21.

[0042] In some embodiments of the present invention, a second check valve 32 is provided in the second air inlet duct 3. The second check valve 32 can be used to prevent the high-speed fresh air from the first air inlet duct 2 from flowing back into the second air inlet duct 3 when the system is at maximum fresh air ventilation, that is, when the fan 21 is at its fastest speed. At this time, the second check valve 32 forms a one-way physical isolation barrier to prevent natural airflow from leaking back through the second air inlet duct 3.

[0043] In some embodiments of the present invention, a structural wind box 6 is provided on the top of the second air intake duct 3. The structural wind box 6 is connected to the second air intake duct 3. An air intake grille 61 connected to the outside is provided on the side of the structural wind box 6. The side of the structural wind box 6 is vertically arranged. The air intake grille 61 is located on the windward side of the ship. Therefore, the air intake area of ​​the air intake grille 61 is the largest. This structural design is fully adapted to the dynamic characteristics of the external airflow when the ship is sailing at high speed. It converts the wind pressure generated by the ship's movement into the natural ventilation driving force of the second air intake duct 3. It completes the air renewal in the cabin without additional energy consumption and solves the inherent defect of the prior art that only the fan 21 actively consumes energy to replace the air.

[0044] In some embodiments of the present invention, a detection door 62 is provided on one side of the structural air box 6, which can be opened and closed quickly, allowing maintenance personnel to directly inspect the internal ventilation components without disassembling the air box shell; a grid platform 63 for walking is laid at the bottom of the structural air box 6, which ensures the convenience of maintenance personnel walking inside the structural air box 6 without affecting the entry of fresh air into the second air inlet duct 3.

[0045] In some embodiments of the present invention, a plurality of ventilation grilles 11 are evenly spaced along the extending direction of the ventilation duct 1. The arrangement of the plurality of ventilation grilles 11 improves the ventilation efficiency of the ventilation duct 1 and further ensures the gas exchange efficiency in the cabin. The even arrangement on the ventilation duct 1 ensures that the ventilation efficiency of different parts in the cabin is average, reduces the generation of dead ventilation zones, and ensures the uniformity of temperature in the cabin.

[0046] In some embodiments of the present invention, the diameter of the ventilation grille 11 is d, and the diameter of the ventilation section 12 in which it is located is D, wherein the ratio of d to D is d≥1 / 2D, that is, the diameter of the ventilation grille 11 is greater than half the diameter of the ventilation section 12. This size setting allows the ventilation grille 11 to fully release the fresh air in the ventilation section 12 into the cabin, ensuring sufficient ventilation at each height in the cabin and preventing the generation of heat exchange dead zones.

[0047] A preferred embodiment of the present invention provides a ship, including a cabin, in which a plurality of fresh air exchange systems according to any of the above embodiments are installed. By installing multiple automatically adjustable fresh air exchange systems, the operating mode of the fresh air systems can be switched according to different conditions, avoiding energy waste caused by the continuous operation of traditional fans, while ensuring the stability of temperature and humidity inside the cabin and improving the ship's energy utilization rate.

[0048] A preferred embodiment of the present invention provides a method for fresh air exchange on a ship, employing any of the fresh air exchange systems described in the above embodiments, comprising the following steps:

[0049] S1: Multiple node temperatures are preset in the controller 4, and the node temperature is determined according to the current outdoor temperature;

[0050] S2: Temperature sensor 5 detects the temperature inside the cabin and transmits the temperature data to controller 4;

[0051] S3: Controller 4 adjusts fan 21 and sealing gate 31 by comparing temperature data and node temperature.

[0052] In this embodiment, the controller 4 monitors the environmental parameters inside the cabin in real time based on the temperature sensor 5. The controller 4 can intelligently determine whether to activate the second air intake duct 3 or the first air intake duct 2. When the cabin temperature is significantly higher than the node temperature, the controller 4 controls both the fan 21 and the sealing gate 31 to open, accelerating ventilation and heat exchange. When the cabin temperature is small compared to the stable node temperature, the system prioritizes opening the sealing gate 31 and shutting down the fan 21, directly utilizing the natural pressure difference generated by the external airflow during ship navigation to achieve passive ventilation. This completes the cabin air replacement without additional energy consumption, significantly reducing the ineffective operating time of the fan 21. This application avoids the energy waste caused by the continuous operation of traditional fans by switching the operation mode of the fresh air system under different conditions, while ensuring the stability of cabin temperature and humidity and improving the ship's energy utilization rate.

[0053] In some embodiments of the present invention

[0054] In S1, the node temperature includes at least a first temperature and a second temperature. The first temperature and the second temperature are determined according to the needs of the cabin and are not specifically limited here.

[0055] In S3, when the temperature data is greater than the first temperature, the controller 4 controls the fan 21 and the sealing gate 31 to open to maximize ventilation; when the temperature data is greater than the second temperature and less than the first temperature, the controller 4 controls the fan 21 to close and the sealing gate 31 to open, allowing air to enter independently through the second air inlet duct 3.

[0056] When the temperature data is lower than the second temperature, the controller 4 controls the fan 21 and the sealing gate 31 to close, stopping the ventilation of the fresh air exchange system.

[0057] In summary, the embodiments of the present invention provide a ship, a fresh air exchange system and method for a ship, which switches the operation mode of the fresh air system under different conditions to avoid energy waste caused by the continuous operation of the traditional fan 21, while ensuring the stability of temperature and humidity inside the cabin and improving the energy utilization rate of the ship.

[0058] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A fresh air exchange system for a marine vessel, characterized in that, include: A ventilation duct is installed inside the cabin. A temperature sensor is installed on the outside of the ventilation duct. The ventilation duct is divided into multiple ventilation sections. The diameter of each ventilation section gradually decreases from high to low. At least one ventilation grille is installed on each ventilation section. The first air intake duct has one end connected to the outside of the cabin and the other end connected to the ventilation duct. A fan is installed inside the first air intake duct. The second air intake duct has one end connected to the outside of the cabin and the other end connected to the ventilation duct. The inlet of the second air intake duct is equipped with a sealing gate. The controller is electrically connected to the temperature sensor, the fan, and the sealing gate. Based on the temperature data acquired by the temperature sensor, the controller controls the opening and closing of the fan and the sealing gate. Specifically, the controller is pre-input into the required cabin temperature. When the cabin temperature is significantly higher than the required temperature, the controller controls both the fan and the sealing gate to open, accelerating ventilation and heat exchange. When the temperature difference between the cabin temperature and the required temperature is small, the controller controls the sealing gate to open and the fan to close, directly utilizing the natural pressure difference generated by external airflow during ship navigation to achieve passive ventilation, completing cabin air replacement without additional energy consumption.

2. A fresh air exchange system for a marine vessel according to claim 1, characterized in that: The controller includes a temperature control unit, which is connected to the temperature sensor. The fan includes a variable frequency fan, and the temperature control unit is also connected to the variable frequency fan to adjust the speed of the variable frequency fan according to the temperature data.

3. A fresh air exchange system for a marine vessel according to claim 1, characterized in that: A first check valve is provided on the side of the fan facing the ventilation duct to prevent fresh air from flowing back into the first air inlet.

4. A fresh air exchange system for a marine vessel according to claim 1, characterized in that: A second check valve is installed in the second air inlet duct.

5. The fresh air exchange system for ships according to claim 1, characterized in that: A structural air box is provided at the top of the second air inlet duct, the structural air box is connected to the second air inlet duct, and a ventilation grille connecting to the outside is provided on the side surface of the structural air box.

6. The fresh air exchange system for ships according to claim 5, characterized in that: An inspection door is provided on one side of the structural air box, and a grid platform for walking is laid on the bottom of the structural air box.

7. The fresh air exchange system for ships according to claim 1, characterized in that, Let the diameter of the ventilation grille be d, and the diameter of the ventilation section in which it is located be D, where the ratio of d to D is 1 / 2. d≥½D.

8. A ship, characterized in that: Includes a ship cabin, wherein the ship cabin is provided with a plurality of fresh air exchange systems for ships as described in any one of claims 1-7.

9. A method for fresh air exchange in ships, characterized in that, The fresh air exchange system for ships according to any one of claims 1-7 includes the following steps: Multiple node temperatures are preset within the controller, and the node temperatures are determined based on the current outdoor temperature. The temperature sensor detects the temperature inside the cabin and transmits the temperature data to the controller. The controller adjusts the fan and the sealing gate by comparing the temperature data with the node temperature.

10. The method for fresh air exchange in a ship according to claim 9, characterized in that: The node temperature includes at least a first temperature and a second temperature; When the temperature data is greater than the first temperature, the controller controls the fan and the sealing gate to open to maximize ventilation; When the temperature data is greater than the second temperature and less than the first temperature, the controller controls the fan to shut down, the sealing gate to open, and air to enter through the second air inlet duct. When the temperature data is lower than the second temperature, the controller controls the fan and the sealing gate to close, stopping the ventilation of the fresh air exchange system.

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