A seawater source heat pump system, operation method, computer device, and storage medium

Abstract

The present invention discloses a seawater source heat pump system, an operation method, a computer device, and a storage medium. Based on a seawater salinity meter and a temperature sensor, the seawater salinity and the intake water temperature at the water intake point are measured respectively, and the freezing point of the water source is determined according to the preset salinity-freezing point correspondence relationship; a temperature difference range is set. When the difference between the intake water temperature and the freezing point of the water source is greater than or equal to the maximum temperature difference threshold, the heat pump system is in normal operation; when the difference between the intake water temperature and the freezing point of the water source is within the set temperature difference range, the heat exchange amount is controlled by adjusting the flow rates of the seawater and the intermediate water in the heat exchanger to ensure that the temperature of the intermediate water is always higher than the preset Celsius degree of the freezing point to prevent freezing; when the difference between the intake water temperature and the freezing point of the water source is less than or equal to the minimum temperature difference threshold, the heat pump system performs a shutdown operation or activates a preset auxiliary measure. Only a salinity meter needs to be installed, the transformation cost is low, the freezing risk can be effectively prevented, the sensible heat utilization rate and the operation stability are improved, and the applicability is extended.

Description

Technical Field

[0001] The present invention belongs to the technical field of development and utilization of renewable energy, and particularly relates to a seawater source heat pump system, an operation method, a computer device, and a storage medium. Background Art

[0002] Based on the reverse Carnot cycle principle, a heat pump system transfers heat from a low-temperature medium to a high-temperature medium by consuming high-grade energy, thereby achieving the effect of reverse heat transfer and realizing heat supply to users. However, for a heat pump system using natural heat sources, the evaporation temperature is significantly restricted by the outdoor environment. The harsh outdoor environment not only directly affects the energy efficiency ratio of the unit, but also may cause freezing inside the heat exchanger for a surface water source heat pump system, and in severe cases, may even directly damage the mechanical structure of the heat exchanger.

[0003] In view of the above problems, the current solutions include:

[0004] 1) Adopt the methods of heating and heat regeneration. Use an electric heater to preheat the water source, and then divert a part of the hot water from the air-conditioning hot water supplied to the end from the condenser to the evaporator to heat the circulating water in the lake heat exchanger, so that the mixed water reaches a good temperature and enters the evaporator to achieve stable operation of the heat pump system. 2) Optimize the structure of the heat exchanger. Reform the shell-and-tube heat exchanger, and a refrigerant and refrigerant oil mixture spray pipe equipped with a spray head is arranged above the heat exchange tubes in its shell body. The refrigerant and the heat exchange medium are heat-exchanged by spraying. Since the water flow rate in the tube is large, the risk of icing is reduced. 3) Set up a deicing device to utilize the latent heat of phase change during icing. Set up an intermediate water cycle. After the heat exchanger freezes to a certain extent, remove the condensate on the heat exchange surface by heat regeneration and mechanical deicing methods, and perform the next cycle operation. 4) Rotate the operation of two groups of heat exchangers. By setting two plate heat exchangers with high heat transfer coefficients, when one heat exchanger freezes and cannot operate, start the ice melting program and enable the other heat exchanger to maintain the normal operation of the system.

[0005] While the seawater source heat pump unit realizes efficient utilization of electric energy by using natural cold sources, in extreme winter conditions, the seawater temperature may drop sharply. Under the traditional operation strategy, the influence of salinity on the freezing point temperature of seawater is not considered, resulting in an incorrect judgment of the heat exchanger icing temperature by the unit. Furthermore, in order to avoid damage to the seawater-side heat exchanger due to icing, the unit is shut down when there is still a large heat exchange temperature difference, reducing the heat pump usage time and applicable area.

[0006] At the same time, the existing solutions mainly focus on the transformation of the system and devices, so there are the following disadvantages:

[0007] (1) Transforming the existing mature system system will increase the failure rate and total investment of the system, thereby reducing the system operation stability and narrowing the application range.

[0008] (2) The influence of seawater salinity on the freezing point is not considered, so that the sufficient extraction of the heat of the water source cannot be achieved with refined operation control.

[0009] Based on this, a motion scheme of a low-temperature seawater source heat pump system based on seawater salinity control is proposed. Summary of the Invention

[0010] For a water source heat pump system using natural cold and heat sources, including river water sources, seawater sources, sewage sources, etc., its temperature is significantly affected by the weather. Under winter conditions, the temperature of the outdoor natural water area fluid is relatively low. If it is introduced into the evaporator of the heat pump unit without control, it is very easy to cause ice formation inside the evaporator, damage the evaporator of the heat pump unit, cause damage to the heat pump unit, and affect the production and life of users. Based on this, the present invention proposes a seawater source heat pump system, an operation method, a computer device, and a storage medium.

[0011] The technical solution adopted by the present invention to solve its technical problems is:

[0012] An operation method of a seawater source heat pump system, the method includes the following steps:

[0013] S100: Measure the seawater salinity at the water intake point and the water intake temperature respectively based on the seawater salinity meter and the heat exchanger inlet temperature sensor of the seawater circulation system, and determine the freezing point of the water source according to the preset salinity-freezing point correspondence relationship;

[0014] S200: Judge the current seawater state according to the difference between the seawater freezing point and the seawater temperature, and adopt corresponding control strategies: set a temperature difference range. When the difference between the water intake temperature and the freezing point of the water source is greater than or equal to the maximum temperature difference threshold, the heat pump system is in normal operation, and the current rotation speeds of the seawater circulation pump and the intermediate water water pump are maintained; when the difference between the water intake temperature and the freezing point of the water source is within the set temperature difference range, control the heat exchange amount by adjusting the seawater and intermediate water flow rates of the heat exchanger to ensure that the intermediate water temperature is always higher than the preset freezing point temperature by a certain number of degrees Celsius to prevent freezing; when the difference between the water intake temperature and the freezing point of the water source is less than or equal to the minimum temperature difference threshold, the heat pump system performs a shutdown operation or enables a preset auxiliary measure.

[0015] Preferably, in S200, controlling the heat exchange amount by adjusting the seawater and intermediate water flow rates of the heat exchanger includes:

[0016] S210: When the heating power demand increases, adjust the rotation speed of the seawater circulation pump of the seawater circulation system to increase the seawater flow rate, thereby increasing the heat exchange amount and raising the intermediate water temperature;

[0017] S220: The increase in the intermediate water temperature will make the outlet temperature of the evaporator of the heat pump main unit higher than the preset freezing point temperature by a certain number of degrees Celsius, thus avoiding ice formation;

[0018] S230: Adjust the rotation speed of the intermediate water pump in the intermediate water circulation system to increase the intermediate water flow rate, adjust the heat exchange amount through the heat exchanger, and read the intermediate water temperature of the inlet sensor and outlet sensor of the heat exchanger in the intermediate water circulation system in real time to ensure that the intermediate water inlet temperature is always higher than the preset freezing point temperature by a certain number of degrees Celsius.

[0019] Preferably, for a given heat exchanger, the heat transfer amount of the heat exchanger is calculated by the following formula:

[0020] ;

[0021] ;

[0022] In the formula, is the heat transfer amount; is the heat transfer coefficient; is the heat transfer area; is the logarithmic mean temperature difference of heat transfer; , is the specific heat capacity of seawater and intermediate water; , is the mass flow rate of seawater and intermediate water; , are the inlet temperature and outlet temperature of seawater on the seawater side of the heat exchanger; , are the inlet temperature and outlet temperature of intermediate water on the intermediate water side of the heat exchanger;

[0023] The heat transfer coefficient in the heat transfer process includes the convective heat transfer coefficients on both sides of the heat transfer and the thermal conductivity of the heat exchanger, that is:

[0024] ;

[0025] In the formula, , are the convective heat transfer coefficients on the seawater side and the intermediate water side respectively; is the thermal resistance;

[0026] Convective heat transfer coefficient , is closely related to the flow rate, specifically:

[0027] ;

[0028] ;

[0029] In the formula, , are empirical constants related to the physical properties of the fluid and the structure of the heat exchanger; , are exponents;

[0030] The relationship between the outlet temperature and the flow rate in the heat exchange process is specifically as follows:

[0031] ;

[0032] ;

[0033] When the heat exchange medium and the heat exchanger are determined, , , , , , , , can all be taken as constants. is the seawater inlet temperature, which has been measured by a sensor. is the inlet temperature of the intermediate water side, which is a controlled parameter and can be regarded as T + 0.5°C. Therefore, the outlet temperatures of the fluids on both sides of the heat exchanger will be directly controlled by the circulation flow rates of the intermediate water and seawater.

[0034] Preferably, the temperature difference range set in S200 is specifically 2°C to 7°C.

[0035] Preferably, the preset Celsius degree to ensure that the intermediate water temperature is always higher than the freezing point temperature is specifically: ensuring that the intermediate water temperature is always 0.5°C higher than the freezing point temperature.

[0036] Preferably, the preset auxiliary measures include at least one of electric auxiliary heating, standby heat source switching, and dynamic salinity compensation.

[0037] A seawater source heat pump system includes an evaporator in the heat pump host, a heat exchanger, an intermediate water pump, an inlet sensor and an outlet sensor of the intermediate water circulation system, an outlet temperature sensor, an inlet temperature sensor, a salinity meter and a seawater circulation pump of the seawater circulation system, and a controller connecting the host, the intermediate water circulation system and the seawater circulation system;

[0038] In the seawater circulation system, the seawater circulation pump transports seawater to the seawater side inlet of the heat exchanger, and a salinity meter and an inlet temperature sensor are installed at the inlet to monitor the seawater salinity and the intake water temperature at the water intake point respectively; after the seawater completes heat exchange with the intermediate water on the seawater side of the heat exchanger, the discharged seawater temperature is monitored by the outlet temperature sensor;

[0039] The evaporator is connected to the intermediate water side of the heat exchanger through the intermediate water circulation system. The intermediate water circulation system is driven by the intermediate water pump. After the intermediate water is pumped out by the intermediate water pump, it enters the evaporator for heat exchange, is cooled, and then the temperature is monitored by the inlet sensor, enters the heat exchanger for heat exchange and temperature rise, and returns to the intermediate water pump after the temperature is monitored by the outlet sensor to form a closed-loop cycle;

[0040] The controller is used to execute the operation method of the seawater source heat pump system.

[0041] A computer device includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the steps of the operation method of the seawater source heat pump system are implemented.

[0042] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the operation method of the seawater source heat pump system are implemented.

[0043] For the above-mentioned seawater source heat pump system, operation method, computer device and storage medium, first judge the freezing point temperature according to the seawater salinity, and then determine the appropriate evaporation temperature and the temperature difference at the seawater heat source end according to the seawater temperature and the seawater freezing point temperature, and then adjust the pump frequency. Finally, on the premise of ensuring safe operation, ensure the operation efficiency of the heat pump system and guarantee the normal production and life of users. Description of the Drawings

[0044] Figure 1 It is a flowchart of the operation method of the seawater source heat pump system in an embodiment of the present invention;

[0045] Figure 2 It is a flowchart of the operation method of the seawater source heat pump system in another embodiment of the present invention;

[0046] Figure 3 It is a structural diagram of a seawater source heat pump system in an embodiment of the present invention;

[0047] Figure 4 It is a diagram of the temperature change of the countercurrent heat exchange fluid of the heat exchanger in an embodiment of the present invention. Detailed Embodiments

[0048] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0049] In one embodiment, as Figure 1 shown, an operation method of a seawater source heat pump system, the method includes the following steps:

[0050] S100: Based on the seawater salinity measuring instrument and the heat exchanger inlet temperature sensor of the seawater circulation system, measure the seawater salinity and the water intake temperature at the water intake point respectively, and determine the freezing point of the water source according to the preset salinity-freezing point correspondence;

[0051] S200: Determine the current seawater state based on the difference between the seawater freezing point and the seawater temperature, and adopt corresponding control strategies: Set the temperature difference range. When the difference between the water intake temperature and the freezing point of the water source is greater than or equal to the maximum temperature difference threshold, the heat pump system operates in a normal state, maintaining the current rotational speeds of the seawater circulation pump and the intermediate water pump; when the difference between the water intake temperature and the freezing point of the water source is within the set temperature difference range, control the heat exchange amount by adjusting the seawater and intermediate water flow rates of the heat exchanger to ensure that the intermediate water temperature is always higher than the preset Celsius degree of the freezing point temperature to prevent freezing; when the difference between the water intake temperature and the freezing point of the water source is less than or equal to the minimum temperature difference threshold, the heat pump system performs a shutdown operation or enables a preset auxiliary measure.

[0052] Specifically, the operation logic of this seawater source heat pump control method is as Figure 1 shown. Different from the freezing point of fresh water, the seawater freezing temperature is highly correlated with its salinity. Currently, the average salinity of the world's oceans is 35‰, and the average freezing point is -1.9°C. However, focusing on local areas, its salinity change may vary with ocean currents and the freshwater flow at the river estuary, thereby affecting the freezing point of the seawater at the seawater intake point of the seawater source heat pump.

[0053] Furthermore, there is a close mathematical relationship between seawater salinity and the freezing point. The precise formula can be calculated as follows:

[0054] ;

[0055] In the formula: is the freezing point, °C, is the salinity, ppt, and in engineering, it can be roughly calculated as .

[0056] Therefore, the primary step of this control method is to measure the seawater salinity at the water intake point. By installing a seawater salinity measuring instrument in the seawater inlet pipeline, measure the salinity of the current water intake, determine the freezing point T of the water source according to the salinity-freezing point correspondence relationship. At the same time, install a temperature sensor in the seawater inlet pipeline to measure the water intake temperature to judge the current seawater state. Furthermore, the water source heat pump unit should ensure that the water temperature is within the normal range. In the heating mode, the temperature difference between the inlet and outlet water temperatures on the water source side is usually 5°C. Considering the fluctuations in heat exchange power and safety requirements, the present invention is designed to be 7°C. The specific temperature difference range set in S200 is 2°C to 7°C. The specific value for ensuring that the intermediate water temperature is always higher than the preset Celsius degree of the freezing point temperature in S200 is: ensuring that the intermediate water temperature is always 0.5°C higher than the freezing point temperature.

[0057] As Figure 2 shown, when - When -T ≥ 7°C, the heat pump system operates under normal conditions without special adjustment. That is, with the goal of ensuring the heating demand at the end and maintaining the high - efficiency operation of the system, parameters such as the supply water temperature at the end, the power of the main unit, and the power of the water pump on the water source side are regulated according to the characteristics of the heat pump and the heating system, and the energy efficiency ratio of the system is maintained in a relatively high range. When 7°C > -T > 2°C, the seawater is in a low - temperature state, and the primary goal should be to avoid ice formation inside the heat exchanger. When 2°C ≥ -T, the system is in a high - risk and low - efficiency state and no longer has the conditions for safe and efficient operation. Shut - down operations or other auxiliary measures are taken, such as at least one of electric auxiliary heating, standby heat source switching, and dynamic salinity compensation, to meet the heating demand of end - users.

[0058] In one embodiment, in the second case, in S200, the heat transfer amount is controlled by adjusting the flow rates of seawater and intermediate fluid in the heat exchanger, including:

[0059] S210: When the heating power demand increases, by adjusting the rotational speed of the seawater circulation pump in the seawater circulation system, the seawater flow rate is increased, thereby increasing the heat transfer amount and raising the temperature of the intermediate fluid;

[0060] S220: The increase in the temperature of the intermediate fluid will cause the outlet temperature of the evaporator of the heat pump main unit to be higher than the preset freezing - point temperature in degrees Celsius, thus avoiding ice formation;

[0061] S230: Adjust the rotational speed of the intermediate - fluid water pump in the intermediate - fluid circulation system to increase the intermediate - fluid flow rate. Through the regulation of the heat transfer amount of the heat exchanger, and real - time reading of the intermediate - fluid temperatures of the inlet sensor and the outlet sensor of the heat exchanger in the intermediate - fluid circulation system, the stable intermediate - fluid inlet temperature is always higher than the preset freezing - point temperature in degrees Celsius.

[0062] Specifically, the temperature change situation in the counter - current heat - exchange process is as Figure 3 shown. Since the low - temperature intermediate - fluid inlet temperature is controlled at T + 0.5°C, the seawater outlet temperature is indirectly controlled, avoiding ice formation inside the heat exchanger and maximizing the use of the heat contained in the seawater.

[0063] In one embodiment, for a given heat exchanger, the heat transfer amount of the heat exchanger is calculated by the following formula:

[0064] ;

[0065] ;

[0066] In the formula, is the heat transfer amount; is the heat - transfer coefficient; is the heat - transfer area; is the logarithmic mean temperature difference; , is the specific heat capacity of seawater and intermediate water; , is the mass flow rate of seawater and intermediate water; , are the inlet temperature and outlet temperature of seawater on the seawater side of the heat exchanger; , are the inlet temperature and outlet temperature of intermediate water on the intermediate water side of the heat exchanger;

[0067] The heat transfer coefficient in the heat transfer process includes the convective heat transfer coefficients on both sides of the heat transfer and the thermal conductivity of the heat exchanger, that is:

[0068] ;

[0069] In the formula, , are the convective heat transfer coefficients on the seawater side and the intermediate water side respectively; is the thermal resistance;

[0070] The convective heat transfer coefficient , is closely related to the flow velocity, specifically:

[0071] ;

[0072] ;

[0073] In the formula, , are empirical constants, related to the fluid physical properties and the heat exchanger structure; , is the exponent;

[0074] The relationship between the outlet temperature and the flow velocity in the heat transfer process is specifically:

[0075] ;

[0076] ;

[0077] When the heat transfer medium and the heat exchanger are determined, , , , , , , , can all be taken as constants, is the seawater inlet temperature, which has been measured by the sensor, is the inlet temperature of the intermediate water side, which is a controlled parameter and can be regarded as the freezing point temperature T + 0.5 °C. Therefore, the outlet temperatures of the fluids on both sides of the heat exchanger will be directly controlled by the circulating flow velocities of the intermediate water and seawater.

[0078] In one embodiment, a seawater source heat pump system, such as Figure 4 shown, includes an evaporator 101 in the heat pump host, a heat exchanger 201, a medium water pump 202, an inlet sensor 203 and an outlet sensor 204 in the intermediate water circulation system, an outlet temperature sensor 301, an inlet temperature sensor 302, a salinity meter 303 and a seawater circulation pump 304 in the seawater circulation system, and a controller connecting the host, the intermediate water circulation system and the seawater circulation system;

[0079] In the seawater circulation system, the seawater circulation pump 304 transports seawater to the seawater side inlet of the heat exchanger 201, where a salinity meter 303 and an inlet temperature sensor 302 are installed to monitor the seawater salinity and the intake water temperature at the water intake point respectively; after the seawater completes heat exchange with the intermediate water on the seawater side of the heat exchanger 201, the discharged seawater temperature is monitored by the outlet temperature sensor 301;

[0080] The evaporator 101 is connected to the intermediate water side of the heat exchanger 201 through the intermediate water circulation system. The intermediate water circulation system is driven by the intermediate water pump 202. After the intermediate water is pumped out by the intermediate water pump 202, it enters the evaporator 101 for heat exchange. After cooling, the temperature is monitored by the inlet sensor 203, then it enters the heat exchanger 201 to heat up, and after the temperature is monitored by the outlet sensor 204, it returns to the intermediate water pump 202 to form a closed-loop cycle;

[0081] The controller is used to execute the operation method of the seawater source heat pump system.

[0082] For the above-mentioned seawater source heat pump system and its operation method, only a salinity meter needs to be added, with minor modifications to the original system, reducing the increase in initial investment caused by additional equipment; improving the utilization rate of the sensible heat of seawater, maximizing the use of natural heat sources while ensuring no freezing disasters; increasing the safe and stable operation time of the system under winter conditions, thereby improving the applicability of the seawater source heat pump.

[0083] A computer device includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the steps of the operation method of the seawater source heat pump system.

[0084] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, it implements the steps of the operation method of the seawater source heat pump system.

[0085] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memories. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0086] The above has introduced in detail a seawater source heat pump system, an operation method, a computer device, and a storage medium provided by the present invention. Specific examples are used in this article to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the core idea of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A method for operating a seawater source heat pump system, characterized in that, The method includes the following steps: S100: Measure the salinity of seawater at the water intake point and the intake water temperature respectively by the seawater salinity meter and the heat exchanger inlet temperature sensor of the seawater circulation system, and determine the freezing point of the water source according to the preset salinity-freezing point correspondence; S200: Judge the current seawater state according to the difference between the seawater freezing point and the seawater temperature, and adopt corresponding control strategies: Set a temperature difference range. When the difference between the intake water temperature and the freezing point of the water source is greater than or equal to the maximum temperature difference threshold, the heat pump system is in normal operation, and the current rotation speeds of the seawater circulation pump and the intermediate water pump are maintained; When the difference between the intake water temperature and the freezing point of the water source is within the set temperature difference range, control the heat exchange amount by adjusting the seawater and intermediate water flow rates of the heat exchanger to ensure that the intermediate water temperature is always higher than the preset Celsius degree of the freezing point temperature to prevent freezing; When the difference between the intake water temperature and the freezing point of the water source is less than or equal to the minimum temperature difference threshold, the heat pump system performs a shutdown operation or enables a preset auxiliary measure; In S200, controlling the heat exchange amount by adjusting the seawater and intermediate water flow rates of the heat exchanger includes: S210: When the heating power demand increases, increase the seawater flow rate by adjusting the rotation speed of the seawater circulation pump of the seawater circulation system, thereby increasing the heat exchange amount and raising the intermediate water temperature; S220: The increase in the intermediate water temperature will make the outlet temperature of the evaporator of the heat pump main unit higher than the preset Celsius degree of the freezing point temperature, thus avoiding icing; S230: Adjust the rotation speed of the intermediate water pump of the intermediate water circulation system to increase the intermediate water flow rate, adjust through the heat exchange amount of the heat exchanger, and read the intermediate water temperatures of the heat exchanger inlet sensor and the outlet sensor of the intermediate water circulation system in real time to keep the intermediate water inlet temperature always higher than the preset Celsius degree of the freezing point temperature.

2. The method according to claim 1, wherein For a given heat exchanger, the heat exchange amount of the heat exchanger is calculated by the following formula: ； ； Wherein, is the heat exchange amount; is the heat transfer coefficient; is the heat exchange area; is the logarithmic mean temperature difference of heat exchange; , is the specific heat capacity of seawater and intermediate water; , is the mass flow rate of seawater and intermediate water; , are the inlet temperature and outlet temperature of seawater on the seawater side of the heat exchanger; , are the inlet temperature and outlet temperature of intermediate water on the intermediate water side of the heat exchanger; The heat transfer coefficient in the heat exchange process includes the convective heat transfer coefficients on both sides of the heat exchange and the thermal conductivity of the heat exchanger, that is: ； wherein, , are the convective heat transfer coefficients on the seawater side and the intermediate water side, respectively; is the thermal resistance of heat conduction; Convective heat transfer coefficient , is closely related to the flow velocity, specifically as follows: ； ； In the formula, , is an empirical constant, which is related to the physical properties of the fluid and the structure of the heat exchanger; , is an exponent; The relationship between the outlet temperature and the flow rate in the heat exchange process is specifically: ； ； When the heat exchange medium and the heat exchanger are determined, , , , , , , , can all be taken as constants, is the seawater inlet temperature, which has been measured by a sensor, is the inlet temperature on the intermediate water side, which is a controlled parameter and can be regarded as T + 0.5°C. Therefore, the outlet temperatures of the fluids on both sides of the heat exchanger will be directly controlled by the circulation flow rates of the intermediate water and seawater.

3. The method according to claim 2, characterized in that, The set temperature difference range in S200 is specifically 2°C to 7°C.

4. The method according to claim 3, wherein Ensuring that the intermediate water temperature is always higher than the preset Celsius degree of the freezing point temperature in S200 is specifically: ensuring that the intermediate water temperature is always higher than the freezing point temperature by 0.5°C.

5. The method according to claim 4, characterized in that The preset auxiliary measures include at least one of electric auxiliary heating, standby heat source switching, and dynamic salinity compensation.

6. A seawater source heat pump system, characterized in that, It includes the evaporator in the heat pump main unit, the heat exchanger, the intermediate water pump, the heat exchanger inlet sensor and the outlet sensor of the intermediate water circulation system, the heat exchanger outlet temperature sensor, the heat exchanger inlet temperature sensor, the salinity meter and the seawater circulation pump of the seawater circulation system, and the controller connecting the main unit, the intermediate water circulation system and the seawater circulation system; In the seawater circulation system, the seawater circulation pump transports seawater to the seawater side inlet of the heat exchanger, and a salinity meter and an inlet temperature sensor are installed at the inlet to monitor the seawater salinity and the intake water temperature at the water intake point respectively; After the seawater completes heat exchange with the intermediate water on the seawater side of the heat exchanger, the discharged seawater temperature is monitored by the outlet temperature sensor; The evaporator is connected to the intermediate water side of the heat exchanger through an intermediate water circulation system, which is driven by an intermediate water pump. After the intermediate water is pumped out by the intermediate water pump, it enters the evaporator for heat exchange. After the temperature is reduced, the temperature is monitored by an inlet sensor, then it enters the heat exchanger for heat exchange and temperature rise, and returns to the intermediate water pump after the temperature is monitored by an outlet sensor, forming a closed-loop cycle; The controller is used to execute the operation method described in any one of claims 1 to 5.

7. A computer device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, the steps of the method described in any one of claims 1 to 5 are implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, the steps of the method described in any one of claims 1 to 5 are implemented.

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