Polar region ship heat pump system

Abstract

The invention belongs to the technical field of ships, and discloses a polar region ship heat pump system. The polar region ship heat pump system comprises a heat circulation system and a seawater heat pump system, the heat exchange circulation system comprises an ice fan, an energy accumulator, a liquid storage tank, an evaporator, a steam compressor and a tail end user heat exchanger, and the ice fan, the liquid storage tank, the evaporator, the steam compressor and the tail end user heat exchanger are sequentially connected through heat exchange working medium pipes to form a first circulation loop. A heat exchange working medium is arranged in the first circulation loop; the ice blower, the energy accumulator and the steam compressor are sequentially connected through the power transmission system, so that the energy accumulator provides mechanical energy for the steam compressor; the seawater heat pump system comprises a seawater tank, a circulating water pump and a ship equipment heat exchanger, the seawater tank is sequentially connected with the circulating water pump, the ship equipment heat exchanger and the evaporator through a first seawater pipeline, and the evaporator is connected with the seawater tank through a second seawater pipeline to form a second circulating loop. Therefore, the energy consumption of the ship is greatly reduced, and the cruising ability of the ship is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to a heat pump system for polar ships. Background Art

[0002] The ambient temperature in polar regions is extremely low, with the air temperature reaching -20℃ in summer and even -50℃ in extreme winter conditions. At the same time, there are polar easterly winds and storms in the polar regions, with an average wind speed of more than 10m / s, which greatly increases the heat exchange between the ship and the environment. Polar ships must also generate a large amount of heat energy to supply the ship with heating and warmth, which places extremely high demands on the thermal insulation of the ship's cabin environment. The hull plates and some tanks in the inner cabins exposed to the outside atmosphere, such as fresh water tanks and seawater tanks, need to be equipped with heating devices, which consumes marine steam. But at the same time, the temperature of the shallow polar seawater hidden under the ice sheet can generally be maintained above 3℃-5℃, forming a huge temperature difference with the atmospheric ambient temperature. Some tanks and tanks below the ship's waterline do not even need to be heated.

[0003] At present, the most commonly used heating methods for polar ships are to use boilers to generate steam, recover waste heat from diesel engine exhaust or obtain thermal energy through electric heating, but they all rely on the consumption of fossil energy, reducing the ship's endurance.

[0004] Therefore, there is an urgent need for a polar ship heat pump system to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a polar ship heat pump system, which greatly reduces the energy consumption of the ship and improves the endurance of the ship.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Polar ship heat pump system, including:

[0008] A heat exchange circulation system, comprising an ice blower, an accumulator, a liquid storage tank, an evaporator, a steam compressor and an end-user heat exchanger, wherein the ice blower, the liquid storage tank, the evaporator, the steam compressor and the end-user heat exchanger are sequentially connected through a heat exchange medium pipe to form a first circulation loop, wherein a heat exchange medium is provided in the first circulation loop;

[0009] The ice blower, the accumulator and the steam compressor are connected in sequence through a power transmission system so that the accumulator provides mechanical energy to the steam compressor;

[0010] The seawater heat pump system comprises a seawater tank, a circulating water pump and a ship equipment heat exchanger. The seawater tank is connected to the circulating water pump, the ship equipment heat exchanger and the evaporator in sequence through a first seawater pipeline. The evaporator is connected to the seawater tank through a second seawater pipeline to form a second circulation loop.

[0011] Optionally, the thermal cycle system also includes a gas-liquid separator, which is arranged between the evaporator and the steam compressor, the inlet of the gas-liquid separator is connected to the outlet of the evaporator, the gas outlet of the gas-liquid separator is connected to the input end of the steam compressor, and the liquid outlet of the gas-liquid separator is connected to the input end of the liquid storage tank.

[0012] Optionally, the thermal cycle system further comprises a flow controller, wherein an input end of the flow controller is connected to an output end of the liquid storage tank, and an output end of the flow controller is connected to an input end of the evaporator.

[0013] Optionally, the outer periphery of the ice blower is coated with the heat exchange medium pipe, and the heat exchange medium pipe on the outer periphery of the ice blower is located in the first circulation loop.

[0014] Optionally, heat dissipation fins are also provided on the outer periphery of the ice blower.

[0015] Optionally, the accumulator is used to store mechanical energy generated by the ice blower and supply the mechanical energy to the steam compressor, wherein the ice blower is an axial flow fan or a centrifugal fan, and the accumulator is a flywheel accumulator or a capacitor accumulator.

[0016] Optionally, the seawater tank is arranged below the waterline of the ship, and the seawater tank includes at least one of a tank, a pool, and a ballast water tank.

[0017] Optionally, the first seawater pipe comprises:

[0018] A first branch pipe, one end of which is connected to the seawater tank, and the other end of which is connected to the input end of the circulating water pump;

[0019] The second branch pipe has one end connected to the external seawater and the other end connected to the input end of the circulating water pump.

[0020] Optionally, the first seawater pipe further comprises:

[0021] A third branch pipe, one end of which is connected to the output end of the circulating water pump, and the other end of which is connected to the ship equipment heat exchanger;

[0022] a fourth branch pipe, one end of which is connected to the output end of the circulating water pump, and the other end of which is connected to the evaporator;

[0023] The fifth branch pipe has one end connected to the output end of the circulating water pump and the other end communicated with the external seawater.

[0024] Optionally, the seawater heat pump system further comprises a temperature sensor, which is disposed on the second seawater pipeline and is used to detect the temperature of the seawater input from the evaporator into the seawater tank.

[0025] Beneficial effects:

[0026] In the polar ship heat pump system provided by the present invention, the ice blower can convert external wind energy into mechanical energy, and drive the steam compressor to do work through the accumulator. The steam compressor uses the mechanical energy transmitted by the accumulator to compress the heat exchange medium and pressurize and heat it. At the same time, the evaporator can absorb the heat brought by the seawater heat pump system to evaporate the liquid heat exchange medium to generate a gaseous heat exchange medium. After the heat exchange medium is heated and pressurized by the evaporator and the steam compressor, it is connected to each end user heat exchanger for sufficient heat exchange. After the heat exchange, the cooling medium is converted back into liquid, enters the ice blower, and is rapidly cooled by the ambient wind, and then enters the next cycle.

[0027] Through the above steps, the widespread wind energy, environmental cold energy and low-grade heat energy of seawater with relatively high ambient temperature in polar regions can be fully utilized. The ice blower used is a power device that converts wind kinetic energy into mechanical energy, so that the heat exchange medium is quickly cooled and liquefied, thereby reducing the input power of the steam compressor. The steam compressor work power comes from the mechanical energy generated by the ice blower driving the accumulator, reducing the energy consumption of the ship's power system.

[0028] Moreover, the seawater heat pump system can not only provide the heat energy required for the evaporation of the heat exchange medium, but also import the heat into the seawater tank for storage, further reducing the steam energy consumed by the ship to keep the seawater tank warm, and reducing the climate and ecological impact on the polar environment. Therefore, the polar ship heat pump system not only makes full use of the energy in the polar environment, but also minimizes the heat energy of the ship dissipated into the atmosphere, greatly reducing the energy consumption of the ship and improving the endurance of the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the polar ship heat pump system provided by the present invention.

[0030] In the figure:

[0031] 1. Ice blower; 2. Accumulator; 3. Liquid storage tank; 5. Flow controller; 6. Evaporator; 7. Gas-liquid separator; 8. Steam compressor; 9. End-user heat exchanger; 10. Circulating water pump; 11. Seawater tank; 12. Temperature sensor; 13. Ship equipment heat exchanger. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] This embodiment provides a polar ship heat pump system, such as Figure 1As shown, the polar ship heat pump system includes a heat exchange circulation system and a seawater heat pump system. The heat exchange circulation system includes an ice blower 1, an accumulator 2, a liquid storage tank 3, an evaporator 6, a steam compressor 8 and an end-user heat exchanger 9. The ice blower 1, the liquid storage tank 3, the evaporator 6, the steam compressor 8 and the end-user heat exchanger 9 are sequentially connected through a heat exchange medium pipe to form a first circulation loop, and a heat exchange medium is provided in the first circulation loop; the ice blower 1, the accumulator 2 and the steam compressor 8 are sequentially connected through a power transmission system so that the accumulator 2 provides mechanical energy for the steam compressor 8. The seawater heat pump system includes a seawater tank 11, a circulating water pump 10 and a ship equipment heat exchanger 13. The seawater tank 11 is sequentially connected to the circulating water pump 10, the ship equipment heat exchanger 13 and the evaporator 6 through a first seawater pipeline, and the evaporator 6 is connected to the seawater tank 11 through a second seawater pipeline to form a second circulation loop.

[0037] When the polar ship heat pump system is working, the ice blower 1 can convert external wind energy into mechanical energy, and drive the steam compressor 8 to work through the accumulator 2. The steam compressor 8 uses the mechanical energy transmitted by the accumulator 2 to compress the heat exchange medium and pressurize and heat it. At the same time, the evaporator 6 can absorb the heat brought by the seawater heat pump system to evaporate the liquid heat exchange medium to generate a gaseous heat exchange medium. After the heat exchange medium is heated and pressurized by the evaporator 6 and the steam compressor 8, it is connected to the heat exchanger 9 of each end user for sufficient heat exchange. After the heat exchange, the cooling medium is converted back into liquid, enters the ice blower 1, is rapidly cooled by the ambient wind, and then enters the next cycle.

[0038] Through the above steps, the widespread wind energy, environmental cold energy and low-grade heat energy of seawater with relatively high temperature in polar regions can be fully utilized. The ice blower 1 used is used as a power device to convert wind kinetic energy into mechanical energy, so that the heat exchange medium is quickly cooled and liquefied, thereby reducing the input power of the steam compressor 8. The working power of the steam compressor 8 comes from the mechanical energy generated by the ice blower 1 driving the accumulator 2, which reduces the energy consumption of the ship's power system.

[0039] Moreover, the seawater heat pump system can not only provide the heat energy required for the evaporation of the heat exchange medium, but also import the heat into the seawater tank 11 for storage, further reducing the steam energy consumed by the ship to keep the seawater tank 11 warm, and reducing the climate and ecological impact on the polar environment. Therefore, the polar ship heat pump system not only makes full use of the energy in the polar environment, but also minimizes the heat energy of the ship dissipated into the atmosphere, greatly reducing the energy consumption of the ship and improving the endurance of the ship.

[0040] Alternatively, if Figure 1As shown, the heat cycle system also includes a gas-liquid separator 7, which is arranged between the evaporator 6 and the steam compressor 8, the inlet of the gas-liquid separator 7 is connected to the outlet of the evaporator 6, the gas outlet of the gas-liquid separator 7 is connected to the input end of the steam compressor 8, and the liquid outlet of the gas-liquid separator 7 is connected to the input end of the liquid storage tank 3. The gas-liquid separator 7 is installed in front of the steam compressor 8, and is used to separate the liquid heat exchange medium that has not formed steam and send it to the evaporator 6 for evaporation again, and the steam heat exchange medium enters the steam compressor 8. By sending the unevaporated liquid heat exchange medium back to the evaporator 6, the evaporation amount of the heat exchange medium is increased, thereby improving the efficiency of the evaporator 6 in absorbing heat. At the same time, after the gaseous medium enters the steam compressor 8, it can be compressed and heated more efficiently to avoid energy waste.

[0041] Alternatively, if Figure 1 As shown, the heat cycle system also includes a flow controller 5, the input end of the flow controller 5 is connected to the output end of the liquid storage tank 3, and the output end of the flow controller 5 is connected to the input end of the evaporator 6. The flow controller 5 transports the liquid heat exchange medium from the liquid storage tank 3 to the evaporator 6, provides voltage stabilization and flow regulation functions for the heat exchange cycle system, and controls the flow rate and flow velocity of the low-temperature liquid medium flowing through the system. By accurately controlling the flow rate of the heat exchange medium, it is ensured that the liquid medium in the evaporator 6 can fully absorb the heat provided by the seawater heat pump system and evaporate completely; and the waste of unevaporated liquid heat exchange medium is reduced, especially when used in conjunction with the gas-liquid separator 7, the effect is better, and the heat exchange efficiency of the evaporator 6 is improved.

[0042] Optionally, in this embodiment, the heat exchange medium has the characteristics of low freezing point and condensation point, is resistant to freezing in polar low temperature environment, and can quickly absorb heat and change from liquid to gas after the temperature rises. The heat exchange medium can be R32 (difluoromethane), R134a (1,1,1,2-tetrafluoroethane), R410A (mixture of difluoromethane and pentafluoroethane), NH 3 (ammonia), R290 (propane) or CO 2 (Carbon dioxide), you can choose according to actual needs.

[0043] Optionally, the periphery of the ice blower 1 is coated with a heat exchange medium pipe, and the heat exchange medium pipe on the periphery of the ice blower 1 is located in the first circulation loop. The polar low temperature environment is usually below 0°C or even lower, which provides a strong cooling capacity for the heat exchange medium. When the ultra-low temperature polar wind passes through, it can quickly take away the residual heat carried by the heat exchange medium, reducing the working energy consumption of the steam compressor 8.

[0044] Optionally, the periphery of the ice blower 1 is further provided with heat dissipation fins, which can significantly increase the contact area with the polar low-temperature air by increasing the surface area of ​​the periphery of the ice blower 1, thereby enhancing the heat exchange effect.

[0045] Optionally, the accumulator 2 is used to store the mechanical energy generated by the ice blower 1 and supply the mechanical energy to the steam compressor 8, wherein the ice blower 1 is an axial flow fan or a centrifugal fan, and the accumulator 2 is a flywheel accumulator or a capacitor accumulator. The connection mode of the power transmission system can be mechanical transmission, power transmission or other equivalent modes.

[0046] By way of example, the mechanical transmission power transmission system is introduced by taking the ice blower 1 as an axial flow blower and the accumulator 2 as a flywheel accumulator as an example.

[0047] The output shaft of the axial flow fan is connected to a gear box, and the output shaft of the gear box is connected to the input shaft of the flywheel accumulator through a coupling. A mechanical clutch (such as a friction clutch or an electromagnetic clutch) is installed at the output end of the flywheel accumulator, and the mechanical clutch is connected to the steam compressor 8 in a transmission manner. The mechanical clutch is used to control the timing of energy release.

[0048] When working, the axial flow fan captures polar wind energy and converts it into mechanical energy. The mechanical energy is transmitted to the flywheel accumulator through the gear box. The flywheel accumulator stores mechanical energy. When the steam compressor 8 needs to run, the mechanical clutch engages, the flywheel accumulator releases the stored kinetic energy, and transmits it to the compressor through the transmission. The transmission adjusts the speed and torque to ensure that the output matches the working requirements of the steam compressor 8.

[0049] Exemplarily, the power transmission system of electric power transmission is described by taking the example that the ice blower 1 is a centrifugal blower, the energy accumulator 2 includes an electrically connected DC generator and a battery, and the steam compressor 8 is an electric steam compressor.

[0050] The output shaft of the centrifugal fan is connected to the input shaft of the DC generator through a speed-increasing gearbox. The speed-increasing gearbox can convert the low speed and high torque of the fan into a high speed suitable for the DC generator, thereby driving the centrifugal fan impeller to rotate through the polar wind to generate mechanical energy. The output end of the DC generator is connected to the charging end of the battery through a cable. The DC generator converts the mechanical energy into DC electrical energy, and the output end of the battery is connected to the motor input end of the electric steam compressor through a cable. It should be noted that if the steam compressor 8 uses a DC motor, it can be directly connected; if the steam compressor 8 uses an AC motor, an inverter must be added between the battery and the compressor, and a motor controller must be provided to adjust the speed.

[0051] Optionally, the liquid storage tank 3 is provided with a filling port and a ventilation port, and the liquid storage tank 3 itself has a purification function, thereby providing the heat exchange circulation system with functions such as medium filling, storage, purification, and ventilation.

[0052] Optionally, the seawater tank 11 is arranged below the waterline of the ship, and the seawater tank 11 includes at least one of a tank, a pool, and a ballast water tank. The seawater temperature is usually higher than the polar air temperature, and the seawater tank 11 maintains a constant low-temperature heat input to ensure that the evaporator 6 converts the heat exchange medium from liquid to gas. Using existing cabins (such as ballast water tanks) as seawater tanks 11 reduces the volume of new equipment, which is suitable for the compact layout of ships. Moreover, when the ballast water tank also serves as the seawater tank 11, it not only adjusts the center of gravity of the ship, but also stores seawater for heat pumps, realizing multiple uses of one cabin and improving the space utilization of the ship, which is particularly suitable for small or medium-sized polar ships.

[0053] Optionally, the seawater tank 11 has the functions of seawater filling, storage and ventilation. It can be one or more, and can be a specially set cabinet, a pool, or a ballast water tank. However, in the absence of a heating device, it should generally be set below the waterline of the ship to maintain the temperature of the seawater.

[0054] Optionally, the first seawater pipe includes a first branch pipe and a second branch pipe, one end of the first branch pipe is connected to the seawater tank 11, and the other end is connected to the input end of the circulating water pump 10, one end of the second branch pipe is connected to the external seawater, and the other end is connected to the input end of the circulating water pump 10, so that water can be taken from the seawater tank 11, or directly from the polar marine environment, thereby improving the flexibility of water intake.

[0055] For example, the first water intake mode: the first branch pipe takes water from the seawater tank 11, the second branch pipe is closed, and the circulating water pump 10 delivers a stable heat source. The second water intake mode: the second branch pipe is opened, the first branch pipe is closed, and natural heat is fully utilized. The third water intake mode (mixed mode): the first branch pipe and the second branch pipe are opened at the same time to balance efficiency and stability.

[0056] Alternatively, if Figure 1 As shown, the first seawater pipe also includes a third branch pipe, a fourth branch pipe and a fifth branch pipe, one end of the third branch pipe is connected to the output end of the circulating water pump 10, and the other end is connected to the ship equipment heat exchanger 13, one end of the fourth branch pipe is connected to the output end of the circulating water pump 10, and the other end is connected to the evaporator 6, and one end of the fifth branch pipe is connected to the output end of the circulating water pump 10, and the other end is connected to the external seawater. The third branch pipe transports seawater to the ship equipment heat exchanger 13, the fourth branch pipe transports seawater to the evaporator 6, and the fifth branch pipe directly discharges excess seawater. The flow ratio of each branch can be adjusted according to demand, which significantly improves the efficiency, stability and adaptability of the seawater heat pump system.

[0057] Optionally, the ship equipment heat exchanger 13 is connected to a cooling water system provided on the ship, and the heat generated by the daily operation of the ship's power unit and auxiliary equipment can be introduced into the seawater through forced heat exchange. At this time, the temperature of the seawater in the first seawater pipe increases, and then enters the evaporator 6 for heat release and cooling. The cooled seawater brings the remaining heat back to the seawater tank 11.

[0058] Optionally, the seawater heat pump system further includes a temperature sensor 12, which is disposed on the second seawater pipeline. The temperature sensor 12 is used to detect the temperature of the seawater input from the evaporator 6 to the seawater tank 11. The seawater temperature can be monitored to determine whether the seawater temperature in the seawater tank 11 is too high. According to the feedback from the temperature sensor 12, a signal is output to the ship equipment heat exchanger 13 when the water temperature is appropriate, thereby reducing the heat energy input and saving ship energy.

[0059] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Polar ship heat pump system, characterized in that: include: A heat exchange circulation system comprises an ice blower (1), an accumulator (2), a liquid storage tank (3), an evaporator (6), a steam compressor (8) and an end-user heat exchanger (9), wherein the ice blower (1), the liquid storage tank (3), the evaporator (6), the steam compressor (8) and the end-user heat exchanger (9) are sequentially connected via a heat exchange medium pipe to form a first circulation loop, wherein a heat exchange medium is provided in the first circulation loop; The ice blower (1), the accumulator (2) and the steam compressor (8) are connected in sequence through a power transmission system so that the accumulator (2) provides mechanical energy for the steam compressor (8); A seawater heat pump system comprises a seawater tank (11), a circulating water pump (10) and a ship equipment heat exchanger (13); the seawater tank (11) is connected to the circulating water pump (10), the ship equipment heat exchanger (13) and the evaporator (6) in sequence through a first seawater pipeline; the evaporator (6) is connected to the seawater tank (11) through a second seawater pipeline to form a second circulation loop.

2. The polar ship heat pump system according to claim 1, characterized in that: The thermal cycle system further comprises a gas-liquid separator (7), which is arranged between the evaporator (6) and the steam compressor (8), the inlet of the gas-liquid separator (7) being connected to the outlet of the evaporator (6), the gas outlet of the gas-liquid separator (7) being connected to the input end of the steam compressor (8), and the liquid outlet of the gas-liquid separator (7) being connected to the input end of the liquid storage tank (3).

3. The polar ship heat pump system according to claim 1, characterized in that: The thermal cycle system further comprises a flow controller (5), the input end of the flow controller (5) being connected to the output end of the liquid storage tank (3), and the output end of the flow controller (5) being connected to the input end of the evaporator (6).

4. The polar ship heat pump system according to claim 1, characterized in that: The outer periphery of the ice blower (1) is coated with the heat exchange medium pipe, and the heat exchange medium pipe on the outer periphery of the ice blower (1) is located in the first circulation loop.

5. The polar ship heat pump system according to claim 1, characterized in that: The outer periphery of the ice blower (1) is also provided with heat dissipation fins.

6. The polar ship heat pump system according to claim 1, characterized in that: The accumulator (2) is used to store the mechanical energy generated by the ice blower (1) and supply the mechanical energy to the steam compressor (8), wherein the ice blower (1) is an axial flow fan or a centrifugal fan, and the accumulator (2) is a flywheel accumulator or a capacitor accumulator.

7. The polar ship heat pump system according to claim 1, characterized in that: The seawater tank (11) is arranged below the waterline of the ship, and the seawater tank (11) comprises at least one of a tank, a pool, and a ballast water tank.

8. The polar ship heat pump system according to claim 1, characterized in that: The first seawater pipe comprises: A first branch pipe, one end of which is connected to the seawater tank (11), and the other end of which is connected to the input end of the circulating water pump (10); The second branch pipe has one end connected to the external seawater and the other end connected to the input end of the circulating water pump (10).

9. The polar ship heat pump system according to claim 8, characterized in that: The first seawater pipe also includes: a third branch pipe, one end of which is connected to the output end of the circulating water pump (10), and the other end of which is connected to the ship equipment heat exchanger (13); a fourth branch pipe, one end of which is connected to the output end of the circulating water pump (10), and the other end of which is connected to the evaporator (6); A fifth branch pipe has one end connected to the output end of the circulating water pump (10) and the other end communicated with external seawater.

10. The polar ship heat pump system according to any one of claims 1 to 9, characterized in that: The seawater heat pump system further comprises a temperature sensor (12), wherein the temperature sensor (12) is arranged on the second seawater pipeline, and the temperature sensor (12) is used to detect the temperature of the seawater input from the evaporator (6) into the seawater tank (11).

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