A ship fresh water cooling system with zoned water supply and control method

Abstract

The present invention relates to the technical field of ship cooling system control, and more particularly to a ship freshwater cooling system with zoned water supply and a control method. The system comprises: dividing all freshwater cooling users into a preset number of cooling user zones based on their freshwater demand and / or heat exchange demand, the number of cooling user zones being equal to the number of zoned water supply pipes; the output end of the freshwater pump in each cooling user zone being connected to the zoned water supply pipe, each output end of the zoned water supply pipe being connected to a freshwater cooling user via a freshwater cooling regulating valve, and the freshwater flow rate to the corresponding freshwater cooling user being adjusted by adjusting the opening of the freshwater cooling regulating valve. The present invention allows the freshwater pump in each water supply zone to adjust its speed / flow rate according to actual demand, eliminating the problem of the flow rates of multiple freshwater pumps being coupled and difficult to adjust in a freshwater cooling system with a main-branch structure.

Description

Technical Field

[0001] The present invention relates to the technical field of ship cooling system control, and in particular to a ship fresh water cooling system with zoned water supply and a control method thereof. Background Art

[0002] At present, low-temperature freshwater cooling systems are widely used in civilian ships to provide cooling for main engines, generators and other auxiliary systems. Low-temperature freshwater cooling systems have little corrosion to pipes and are clean, have low management costs, and have strong system reliability. They provide cooling for most equipment on the ship to ensure normal use by users and stable operation of equipment. Specifically, the ship's freshwater cooling system mainly aims to provide sufficient freshwater flow to meet the heat exchange between the freshwater circuit and the freshwater cooling users under rated operating conditions. It is unable to dynamically and finely adjust the freshwater pump speed / flow and the opening of the freshwater cooling control valve according to the actual heat exchange demand of each freshwater cooling user under the variable operating mode of the ship's power system. There may be excessive heat exchange in the freshwater circuit caused by excessive freshwater flow, or even moisture and condensation problems in the freshwater cooling users, affecting the stable and reliable operation of the freshwater cooling users.

[0003] In the existing low-temperature fresh water cooling system, a fixed-frequency water pump is used to transport cooling fresh water to the user. The fixed-frequency water pump usually outputs a constant amount of fresh water. When the user's fresh water demand decreases, the output of fresh water cannot be reduced in real time, resulting in a waste of fresh water, which is not conducive to energy conservation and environmental protection. When the user's fresh water demand increases, the output of fresh water cannot be increased in real time. The amount of fresh water is too small to meet the user's cooling needs, causing the temperature of the user and the equipment to be too high, thereby affecting the normal use of the user and the stable operation of the equipment. In addition, the actual heat exchange demand of each fresh water cooling user in the existing cooling system is often inconsistent, but the existing system is Figure 1 The structure shown cannot meet the needs of adaptive adjustment for the actual heat exchange demand of each fresh water cooling user. It can only make overall adjustments through the main pump, and cannot timely and accurately adjust the flow according to the actual heat exchange demand of each fresh water cooling user, which is not conducive to improving cooling efficiency. Summary of the Invention

[0004] The present invention provides a marine freshwater cooling system with zoned water supply and a control method, which are used to address the above-mentioned defects in the prior art. The system eliminates the problem that the flow rates of multiple freshwater pumps in a freshwater cooling system with a main pipe-branch pipe structure are coupled with each other and difficult to adjust. The system facilitates the individual control of the freshwater flow rate and heat exchange capacity of the freshwater pumps in each zone, thereby improving the stability and rationality of the freshwater flow distribution in the freshwater cooling system with a main pipe-branch pipe structure.

[0005] The present invention provides a zoned water supply marine freshwater cooling system, comprising a water intake main, a freshwater pump, zoned water supply pipes, a return water main, a freshwater cooling regulating valve, a seawater / freshwater heat exchanger, and freshwater cooling users. Based on the freshwater demand and / or heat exchange demand of each freshwater cooling user, all the freshwater cooling users are divided into a preset number of cooling user zones, and the number of cooling user zones is the same as the number of zoned water supply pipes.

[0006] The fresh water output ports of all seawater / freshwater heat exchangers are connected to the water intake main pipe, through which fresh water is supplied to each cooling user zone; the output end of each cooling user zone is connected to the return water main pipe, through which fresh water is returned to any seawater / freshwater heat exchanger;

[0007] Among them, each cooling user zone includes at least one fresh water pump, a zone water supply pipe, multiple fresh water cooling regulating valves and multiple fresh water cooling users. The output end of the fresh water pump is connected to the zone water supply pipe, and each output end of the zone water supply pipe is connected to a fresh water cooling regulating valve to a fresh water cooling user. The fresh water flow of the corresponding fresh water cooling user is adjusted by adjusting the opening of the fresh water cooling regulating valve.

[0008] The present invention also provides a method for controlling a marine freshwater cooling system with zoned water supply, comprising the following steps:

[0009] S1 divides all fresh water cooling users into a preset number of cooling user zones according to the fresh water demand and / or heat exchange demand of each fresh water cooling user, and supplies fresh water to multiple fresh water cooling users in each cooling user zone through a zone water supply pipe;

[0010] S2: for each cooling user partition, obtaining the fresh water demand flow and the measured fresh water flow of each fresh water cooling user in the current cooling user partition, and calculating the difference between the fresh water demand flow and the measured fresh water flow of each fresh water cooling user as the fresh water flow deviation;

[0011] S3: the fresh water cooling users whose fresh water flow deviation is greater than the upper limit of the flow deviation threshold interval are grouped as the first group, and the fresh water cooling users whose fresh water flow deviation is less than the lower limit of the flow deviation threshold interval are grouped as the second group; adjusting the fresh water supply to the fresh water cooling users in the first group or the second group until the fresh water flow deviations of the first group and the second group are both greater than the upper limit of the flow deviation threshold interval or both are less than the lower limit of the flow deviation threshold interval;

[0012] S4 adjusts the fresh water pump connected to the cooling user partition, and repeats steps S2-S3 until the fresh water flow deviations of the first group and the second group both fall within the flow deviation threshold range.

[0013] According to a method for controlling a marine freshwater cooling system with zoned water supply provided by the present invention, in step S3, adjusting the freshwater supply amount to freshwater cooling users in the first group or the second group includes:

[0014] Each fresh water cooling user is connected to a partitioned water supply pipe with a fresh water cooling regulating valve, and the fresh water flow of the corresponding fresh water cooling user is adjusted by adjusting the opening of the fresh water cooling regulating valve.

[0015] According to a method for controlling a marine freshwater cooling system with zoned water supply provided by the present invention, in step S3, adjusting the freshwater supply amount to freshwater cooling users in the first group or the second group includes:

[0016] For the first group, increase the opening of all fresh water cooling regulating valves in the first group, and increase the fresh water supply to each fresh water cooling user in the first group until the fresh water flow deviation of all fresh water cooling users in the first group is less than the lower limit of the flow deviation threshold range;

[0017] Alternatively, for the second group, the openings of all fresh water cooling regulating valves in the second group are reduced, and the fresh water supply to each fresh water cooling user in the second group is reduced until the fresh water flow deviation of all fresh water cooling users in the second group is greater than the upper limit of the flow deviation threshold range.

[0018] According to a method for controlling a marine freshwater cooling system with zoned water supply provided by the present invention, step S4 includes:

[0019] For each cooling user zone, if the fresh water flow deviation of each fresh water cooling user in the current cooling user zone is greater than the upper limit of the flow deviation threshold range, then the fresh water demand flow of each fresh water cooling user in the current cooling user zone is greater than the measured fresh water flow, and the fresh water pump in the current cooling user zone is adjusted to increase the fresh water flow, and steps S2-S3 are repeated until the fresh water flow deviations of all fresh water cooling users in the current cooling user zone fall within the flow deviation threshold range;

[0020] If the fresh water flow deviation of each fresh water cooling user in the current cooling user partition is less than the flow deviation threshold range, the fresh water demand flow of each fresh water cooling user in the current cooling user partition is less than or equal to the measured fresh water flow, and the fresh water pump in the current cooling user partition is adjusted to reduce the fresh water flow. Repeat steps S2-S3 until the fresh water flow deviations of all fresh water cooling users in the current cooling user partition fall within the flow deviation threshold range.

[0021] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of any of the above-described ship fresh water cooling system control methods are implemented.

[0022] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above-described ship fresh water cooling system control methods.

[0023] The present invention provides a marine freshwater cooling system and control method with zoned water supply, which has at least the following technical effects:

[0024] (1) Compared with the existing fresh water cooling system with a main pipe-branch pipe structure, the ship fresh water cooling system with a partitioned water supply structure provided by the present invention eliminates the unified water supply main pipe, allowing the fresh water pump in each water supply zone to adjust the speed / flow rate according to actual needs, eliminating the problem that the flow rates of multiple fresh water pumps in the fresh water cooling system with a main pipe-branch pipe structure are coupled with each other and difficult to adjust, facilitating the individual control of the fresh water flow rate and heat exchange capacity of the fresh water pump in each zone, and improving the stability and rationality of the fresh water flow distribution in the fresh water cooling system with a main pipe-branch pipe structure.

[0025] (2) The control method of the ship fresh water cooling system with zoned water supply proposed in this scheme combines the individual control of each fresh water zone, the coarse adjustment of the speed / flow of the fresh water pump in the zone with the fine adjustment of the opening of each fresh water cooling regulating valve, and adjusts the opening of each fresh water cooling regulating valve to finely adjust the fresh water circuit flow of each user, so that the fresh water flow of all fresh water cooling users in the zone is too much or too little, and then adjusts the fresh water pump corresponding to the zone to reduce or increase the fresh water pump flow, so as to match the actual heat exchange demand of each fresh water cooling user under the variable operating mode of the ship power system, prevent excessive heat exchange of the fresh water circuit caused by excessive fresh water flow, and even prevent moisture and condensation problems of fresh water cooling users, thereby realizing targeted individual control of each fresh water zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 It is a structural diagram of a ship fresh water cooling system in the prior art;

[0028] Figure 2This is a schematic structural diagram of the marine freshwater cooling system with zoned water supply provided by the present invention;

[0029] Figure 3 It is a flow chart of the control method of the ship fresh water cooling system provided by the present invention. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0031] The terms "including" and "having," and any variations thereof, in the specification and claims of this application and the accompanying drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or modules is not limited to the listed steps or modules, but may optionally include steps or modules not listed, or may optionally include other steps or modules inherent to the process, method, product, or apparatus.

[0032] It should be noted that the terms "first" and "second" as used herein are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It is understood that the terms "first" and "second" may interchangeably represent a specific order or precedence, where permitted. It should be understood that the objects distinguished by "first" and "second" may be interchangeable, where appropriate, such that the embodiments of the present invention described herein may be implemented in an order other than that described or illustrated herein.

[0033] It should be noted that the ship fresh water cooling system provided by the prior art is as follows Figure 1As shown, the water supply network for fresh water users adopts a main pipe-branch pipe structure. The main pipe includes a water intake main pipe, a water supply main pipe and a return water main pipe. The fresh water pump is connected in parallel between the water intake main pipe and the water supply main pipe. The fresh water cooling users and their series-connected fresh water cooling regulating valves are connected in parallel between the water supply main pipe and the return water main pipe. The seawater / fresh water heat exchanger is connected in parallel between the return water main pipe and the water intake main pipe. The fresh water taken from the return water main pipe is cooled by seawater in the seawater / fresh water heat exchanger and then enters the water intake main pipe. The fresh water in the water intake main pipe is pressurized by the fresh water pump and then enters the fresh water cooling regulating valve. For water cooling users, fresh water is collected into the return water main after heat exchange with the cooling users. Based on the existing main-branch structure of fresh water cooling system, multiple fresh water pumps supply water to all fresh water cooling users at the same time through the same water supply main. The flow rates of multiple fresh water pumps are coupled with each other, making it difficult to improve the precise control of fresh water flow. Due to the differences in the location of fresh water cooling users and the setting of cabin structures, the fresh water demand flow rates of different areas and cooling users are different, and the same water supply main cannot achieve differential adjustment of cooling capacity in different areas.

[0034] In one embodiment, Figure 2 As shown, the present invention provides a zoned water supply marine freshwater cooling system, comprising a water intake main, a freshwater pump, a zoned water supply pipe, a return water main, a freshwater cooling regulating valve, a seawater / freshwater heat exchanger, and freshwater cooling users; based on the freshwater demand and / or heat exchange demand of each freshwater cooling user, all the freshwater cooling users are divided into a preset number of cooling user zones, and the number of cooling user zones is the same as the number of the zoned water supply pipes;

[0035] The fresh water output ports of all seawater / freshwater heat exchangers are connected to the water intake main pipe, through which fresh water is supplied to each cooling user zone; the output end of each cooling user zone is connected to the return water main pipe, through which fresh water is returned to any seawater / freshwater heat exchanger;

[0036] Each cooling user zone includes at least one fresh water pump, a zone water supply pipe, multiple fresh water cooling regulating valves, and multiple fresh water cooling users. The output end of the fresh water pump is connected to the zone water supply pipe, and each output end of the zone water supply pipe is connected to a fresh water cooling regulating valve to a fresh water cooling user. The fresh water flow to the corresponding fresh water cooling user is adjusted by adjusting the opening of the fresh water cooling regulating valve.

[0037] It should be noted that the ship freshwater cooling system provided by the present invention divides all freshwater cooling users into multiple zones based on the installation location of the equipment in the cabin, the functions of the cooling users, the heat exchange requirements, and other characteristics. Freshwater is supplied to the cooling users in the corresponding areas through different zoned water supply pipes. In each zone, the corresponding freshwater pump is connected in parallel with the corresponding water supply pipe in the zone through the water intake main outside the zone. Each freshwater cooling user in the zone and its series-connected freshwater cooling regulating valve are connected in parallel with the return water main outside the zone through the corresponding water supply pipe. The connection method between the return water main outside the zone and the water intake main is the same as that of the main-branch structure, that is, the seawater / freshwater heat exchanger is connected in parallel between the return water main and the water intake main.

[0038] Fresh water drawn from the return main is cooled by seawater in a seawater / freshwater heat exchanger before entering the intake main. The fresh water in the intake main is then pressurized by freshwater pumps in each zone and then flows into the freshwater supply pipes of each zone. Freshwater from each freshwater supply pipe flows through freshwater cooling regulating valves and flows into the freshwater cooling users. After heat exchange with the cooling users, the freshwater is then collected in the return main. Compared to existing freshwater cooling systems with a main-branch structure, the zoned water supply system eliminates a unified water supply main, allowing the freshwater pumps in each water supply zone to adjust their speed and flow rate according to actual demand. This eliminates the problem of multiple freshwater pumps being coupled and difficult to adjust in a main-branch structure, and enables individual control of the freshwater flow rate and heat exchange capacity of the freshwater pumps in each zone.

[0039] In one embodiment, Figure 3 As shown, the present invention also provides a method for controlling a marine freshwater cooling system with zoned water supply, comprising the following steps:

[0040] S1 divides all fresh water cooling users into a preset number of cooling user zones according to the fresh water demand and / or heat exchange demand of each fresh water cooling user, and supplies fresh water to multiple fresh water cooling users in each cooling user zone through a zone water supply pipe;

[0041] S2: for each cooling user partition, obtaining the fresh water demand flow and the measured fresh water flow of each fresh water cooling user in the current cooling user partition, and calculating the difference between the fresh water demand flow and the measured fresh water flow of each fresh water cooling user as the fresh water flow deviation;

[0042] S3: the fresh water cooling users whose fresh water flow deviation is greater than the flow deviation threshold interval are grouped as a first group, and the fresh water cooling users whose fresh water flow deviation is less than the flow deviation threshold interval are grouped as a second group; adjusting the fresh water supply to the fresh water cooling users in the first group or the second group until the fresh water flow deviations of the first group and the second group are both greater than the flow deviation threshold interval or both are less than the flow deviation threshold interval;

[0043] S4 adjusts the fresh water pump connected to the cooling user partition, and repeats steps S2-S3 until the fresh water flow deviations of the first group and the second group are both within the flow deviation threshold range;

[0044] It can be understood that, for the sake of convenience, in the embodiment of the present invention, the interval greater than the flow deviation threshold value is greater than the upper limit of the flow deviation threshold value, and the interval less than the flow deviation threshold value is less than the lower limit of the flow deviation threshold value;

[0045] According to a method for controlling a marine freshwater cooling system with zoned water supply provided by the present invention, in step S3, adjusting the freshwater supply amount to freshwater cooling users in the first group or the second group includes:

[0046] Each fresh water cooling user is connected to a partitioned water supply pipe with a fresh water cooling regulating valve, and the fresh water flow of the corresponding fresh water cooling user is adjusted by adjusting the opening of the fresh water cooling regulating valve.

[0047] Specifically, in step S3, adjusting the fresh water supply to the fresh water cooling users in the first group or the second group includes:

[0048] For the first group, increase the opening of all fresh water cooling regulating valves in the first group, and increase the fresh water supply to each fresh water cooling user in the first group until the fresh water flow deviation of all fresh water cooling users in the first group is less than the flow deviation threshold range;

[0049] Alternatively, for the second group, the openings of all fresh water cooling regulating valves in the second group are reduced, and the fresh water supply to each fresh water cooling user in the second group is reduced until the fresh water flow deviation of all fresh water cooling users in the second group is greater than the flow deviation threshold range.

[0050] Specifically, step S4 includes:

[0051] For each cooling user zone, if the fresh water flow deviation of each fresh water cooling user in the current cooling user zone is greater than the flow deviation threshold interval, then the fresh water demand flow of each fresh water cooling user in the current cooling user zone is greater than the measured fresh water flow, and the fresh water pump in the current cooling user zone is adjusted to increase the fresh water flow, and steps S2-S3 are repeated until the fresh water flow deviations of all fresh water cooling users in the current cooling user zone fall within the flow deviation threshold interval;

[0052] If the fresh water flow deviation of each fresh water cooling user in the current cooling user zone is less than the flow deviation threshold interval, the fresh water demand flow of each fresh water cooling user in the current cooling user zone is less than or equal to the measured fresh water flow, and the fresh water pump in the current cooling user zone is adjusted to reduce the fresh water flow, and steps S2-S3 are repeated until the fresh water flow deviations of all fresh water cooling users in the current cooling user zone fall within the flow deviation threshold interval;

[0053] Preferably, under ideal conditions, the flow deviation threshold interval only takes a threshold of 0, that is, the fresh water demand flow rate and the fresh water measured flow rate completely match, and the upper and lower limits of the flow deviation threshold interval depend on the adjustment accuracy of the measuring instrument, pump, valve and other components;

[0054] In a specific embodiment, the present invention provides a method for controlling a marine freshwater cooling system with zoned water supply, comprising the following steps:

[0055] Step 1: Divide all fresh water cooling users into N partitions based on their installation locations, cooling user functions, heat exchange requirements, and other characteristics.

[0056] Step 2: For the i-th fresh water zone (i=1,2,...,N), obtain the value of the fresh water flow deviation of all fresh water cooling users in the zone. Assuming that there are M fresh water cooling users in the i-th fresh water zone (it should be noted that the number of fresh water cooling users in different fresh water zones can be different, that is, the value of M is not fixed and only represents the number of all fresh water cooling users in a certain zone), for the j-th fresh water cooling user in the i-th fresh water zone (i=1,2,...,N; j=1,2,...,M), calculate the fresh water demand flow of the fresh water cooling user according to the operating temperature set value of the fresh water cooling user Compare the fresh water demand flow of this fresh water cooling user and the measured freshwater flow W ij , calculate the fresh water flow deviation of the fresh water cooling user

[0057] Step 3: If the fresh water flow deviations of all fresh water cooling users in the zone are greater than the flow deviation threshold interval or less than the flow deviation threshold interval, indicating that the fresh water flow of all fresh water cooling users in the zone is less than the fresh water demand flow or greater than the fresh water demand flow, then execute step 6;

[0058] If the fresh water flow deviations of different fresh water cooling users are inconsistent with the flow deviation threshold interval, execute step 4;

[0059] Step 4: Calculate the freshwater flow deviation E of the M freshwater cooling users in the i-th freshwater partition Wij, according to the fresh water flow deviation E of M fresh water cooling users Wij Is it greater than the flow deviation threshold interval? The M fresh water cooling users are divided into two parts. The fresh water flow deviation E Wij > Upper limit of flow deviation threshold interval, fresh water flow deviation E of the second part fresh water cooling users Wij <The lower limit of the flow deviation threshold interval;

[0060] Step 5: For the fresh water flow deviation E of < fresh water cooling users in the i-th fresh water zone Wij >The fresh water cooling users in the flow deviation threshold range, i.e. the first part of fresh water cooling users, at this time, the fresh water pump in the current fresh water zone remains stationary, and the fresh water flow of the corresponding zone water supply pipe remains unchanged. By increasing the opening of the fresh water cooling regulating valve corresponding to this part of fresh water cooling users, the fresh water volume of the first part of fresh water cooling users can be increased until the fresh water flow deviation E of the first part of fresh water cooling users is Wij <The lower limit of the flow deviation threshold interval or the fresh water flow deviation E of the second part of fresh water cooling users Wij > the upper limit of the flow deviation threshold interval, then the fresh water flow deviation E of M fresh water cooling users is Wij The relationship between the flow deviation threshold and the flow rate is consistent, that is, the fresh water flow of the M fresh water cooling users in the i-th fresh water zone is excessive or insufficient;

[0061] Step 6: If the fresh water flow rates of the M fresh water cooling users in the i-th fresh water zone are all excessive, the speed of the corresponding fresh water pump in the i-th fresh water zone is reduced. By reducing the speed of the fresh water pump, the total fresh water flow rate through the fresh water pump and the water supply pipe in the i-th fresh water zone is reduced. If the fresh water flow rates of the M fresh water cooling users in the i-th fresh water zone are all insufficient, the speed of the corresponding fresh water pump in the i-th fresh water zone is increased. By increasing the speed of the fresh water pump, the total fresh water flow rate through the fresh water pump and the water supply pipe in the i-th fresh water zone is increased.

[0062] Step 7: Repeat steps 2 to 6 until the measured fresh water flow rate W of M fresh water cooling users in the i-th fresh water zone is ij Able to match fresh water demand flow The difference between the two is within the range of the flow deviation threshold. At this time, the M fresh water cooling users in the i-th fresh water partition can achieve dynamic and refined flow control.

[0063] Step 8: Let i = i + 1, and repeat steps 2 to 7 multiple times until i = N, and perform dynamic and refined flow control for all fresh water cooling users in the N fresh water partitions;

[0064] Preferably, the flow deviation threshold interval can select a suitable value according to the accuracy of the equipment, cooling efficiency, cooling temperature and other conditions. The most preferred single threshold is 0, requiring the fresh water demand flow rate to be completely consistent with the measured fresh water flow rate;

[0065] The present invention further provides an electronic device, comprising: a processor, a communications interface, a memory, and a communications bus, wherein the processor, the communications interface, and the memory communicate with each other via the communications bus. The processor can invoke logic instructions in the memory to execute the steps of the marine freshwater cooling system control method provided by the aforementioned methods.

[0066] In addition, the logical instructions in the above-mentioned memory can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program code.

[0067] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the steps of the ship fresh water cooling system control method provided by the above methods.

[0068] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the steps of the ship fresh water cooling system control method provided by the above methods.

[0069] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0070] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A marine freshwater cooling system with zoned water supply, characterized in that: It includes a water intake main, a fresh water pump, a zoned water supply pipe, a return water main, a fresh water cooling regulating valve, a seawater / fresh water heat exchanger, and fresh water cooling users; according to the fresh water demand and / or heat exchange demand of each fresh water cooling user, all the fresh water cooling users are divided into a preset number of cooling user zones, and the number of cooling user zones is the same as the number of the zoned water supply pipes; The fresh water output ports of all seawater / freshwater heat exchangers are connected to the water intake main pipe, through which fresh water is supplied to each cooling user zone; the output end of each cooling user zone is connected to the return water main pipe, through which fresh water is returned to any seawater / freshwater heat exchanger; Among them, each cooling user zone includes at least one fresh water pump, a zone water supply pipe, multiple fresh water cooling regulating valves and multiple fresh water cooling users. The output end of the fresh water pump is connected to the zone water supply pipe, and each output end of the zone water supply pipe is connected to a fresh water cooling user through a fresh water cooling regulating valve. The fresh water flow of the corresponding fresh water cooling user is adjusted by adjusting the opening of the fresh water cooling regulating valve; in each zone, the corresponding fresh water pump is connected in parallel with the corresponding water supply pipe in the zone through the water intake main outside the zone, and each fresh water cooling user in the zone and its series-connected fresh water cooling regulating valve are connected in parallel through the corresponding water supply pipe and the return water main outside the zone.

2. A control method for a ship fresh water cooling system with zoned water supply, applied to the ship fresh water cooling system with zoned water supply as claimed in claim 1, characterized in that: include: S1 divides all fresh water cooling users into a preset number of cooling user zones according to the fresh water demand and / or heat exchange demand of each fresh water cooling user, and supplies fresh water to multiple fresh water cooling users in each cooling user zone through a zone water supply pipe; S2: for each cooling user partition, obtaining the fresh water demand flow and the measured fresh water flow of each fresh water cooling user in the current cooling user partition, and calculating the difference between the fresh water demand flow and the measured fresh water flow of each fresh water cooling user as the fresh water flow deviation; S3: fresh water cooling users whose fresh water flow deviation is greater than the upper limit of the flow deviation threshold interval are grouped as the first group, and fresh water cooling users whose fresh water flow deviation is less than the lower limit of the flow deviation threshold interval are grouped as the second group; For the first group, increase the opening of all fresh water cooling regulating valves in the first group, and increase the fresh water supply to each fresh water cooling user in the first group until the fresh water flow deviation of all fresh water cooling users in the first group is less than the lower limit of the flow deviation threshold range; Alternatively, for the second group, the openings of all fresh water cooling regulating valves in the second group are reduced, thereby reducing the fresh water supply to each fresh water cooling user in the second group until the fresh water flow deviation of all fresh water cooling users in the second group exceeds the upper limit of the flow deviation threshold range; S4 adjusts the fresh water pump connected to the cooling user partition, and repeats steps S2-S3 until the fresh water flow deviations of the first group and the second group both fall within the flow deviation threshold range.

3. The control method for a marine freshwater cooling system with zoned water supply according to claim 2, characterized in that: Step S4 includes: For each cooling user zone, if the fresh water flow deviation of each fresh water cooling user in the current cooling user zone is greater than the upper limit of the flow deviation threshold range, then the fresh water demand flow of each fresh water cooling user in the current cooling user zone is greater than the measured fresh water flow, and the fresh water pump in the current cooling user zone is adjusted to increase the fresh water flow, and steps S2-S3 are repeated until the fresh water flow deviations of all fresh water cooling users in the current cooling user zone fall within the flow deviation threshold range; If the fresh water flow deviation of each fresh water cooling user in the current cooling user partition is less than the lower limit of the flow deviation threshold range, the fresh water demand flow of each fresh water cooling user in the current cooling user partition is less than or equal to the measured fresh water flow, and the fresh water pump in the current cooling user partition is adjusted to reduce the fresh water flow. Repeat steps S2-S3 until the fresh water flow deviations of all fresh water cooling users in the current cooling user partition fall within the flow deviation threshold range.

4. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the ship fresh water cooling system control method according to any one of claims 2 to 3 are implemented.

5. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the ship fresh water cooling system control method according to any one of claims 2 to 3 are implemented.

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