Multi-energy synergistic temperature regulation system and method for aquaculture water body

Abstract

The invention provides a multi-energy synergistic temperature regulation system and method for a culture water body, and the method comprises a solar heat collection subsystem which is used for absorbing solar energy to heat the water body; a seawater source heat pump subsystem; the breeding wastewater waste heat recovery subsystem is configured to preheat a water body by using wastewater discharged from the breeding pond; the water storage subsystem comprises a water storage tank for storing a water body and a seedling culture water tank for storing the heated water body; and the central controller is configured to cooperatively control the breeding wastewater waste heat recovery subsystem, the solar heat collection subsystem and the seawater source heat pump subsystem in a heating mode in a heating mode, and water in the water storage tank is heated and then sent to the seedling culture water tank. Compared with a traditional single heat source system, the operation cost is remarkably reduced, carbon emission is greatly reduced, and reliable technical support is provided for achieving green and energy-saving production of aquaculture.

Description

Technical Field

[0001] This invention relates to the field of aquaculture technology, specifically to a multi-functional synergistic temperature regulation system and method for aquaculture water. Background Technology

[0002] Modern factory-style aquaculture, especially year-round production in northern coastal areas, has a rigid requirement for precise control of water temperature. For example, the seedling stage in aquaculture typically requires maintaining a constant water temperature of 22-25°C. Traditional heating methods, such as coal-fired or gas-fired boilers, are not only costly to operate but also generate significant carbon emissions, facing severe environmental policy pressures. Although clean energy technologies such as solar collectors have been applied, their energy efficiency is greatly affected by day and night and seasons, making it impossible to guarantee stable heating around the clock. Furthermore, in low-temperature winter conditions, single seawater source heat pump systems are prone to frost formation on the evaporator side, leading to a significant decrease in the coefficient of performance (COP) and a sharp increase in energy consumption.

[0003] The fundamental flaw in existing technologies lies in the fact that various energy utilization schemes are often independent and fail to form effective synergy. For example, the waste heat from low-grade aquaculture wastewater and solar energy are not effectively integrated to increase the initial temperature of the water entering the heat pump system. This results in high-efficiency heat pump equipment operating under harsh conditions of low temperature and high load for extended periods, leading to low overall system energy efficiency and high operating costs. Therefore, there is an urgent need in this field for an integrated system solution that can achieve cascaded energy utilization, intelligent synergy, and significantly reduce the energy consumption of the main heating equipment. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a multi-energy synergistic temperature regulation system and method for aquaculture water, which solves the problems of low overall energy efficiency and high operating costs in existing aquaculture systems.

[0005] The technical solution of this invention is implemented as follows: a multi-functional synergistic temperature regulation system for aquaculture water, comprising: A solar thermal collector system is used to absorb solar energy to heat water. The seawater source heat pump subsystem is configured to have at least a heating mode; The wastewater heat recovery subsystem for aquaculture is configured to preheat the water body using the wastewater discharged from the aquaculture ponds; The water storage subsystem includes a water storage tank for storing water and a seedling water tank for storing water after it has been heated. The central controller is connected to the solar thermal collector subsystem, the seawater source heat pump subsystem, the aquaculture wastewater waste heat recovery subsystem, and the water storage subsystem. The central controller is configured to, at least in the heating mode, coordinately control the aquaculture wastewater waste heat recovery subsystem, the solar thermal collection subsystem, and the seawater source heat pump subsystem in the heating mode according to a first preset rule, so as to heat the water in the storage tank and send it to the seedling water tank.

[0006] In one embodiment, given that existing single heat pump systems experience a significant drop in energy efficiency ratio (EER) of 25%-35% during high-temperature summer cooling operations due to a surge in condensing pressure, they struggle to economically and efficiently meet the cooling requirements of the temporary holding phase. Furthermore, traditional solutions typically require two independent systems to address both heating and cooling needs, resulting in high initial investment, large footprint, and difficulties in coordinated control. As an improvement, this embodiment configures the seawater source heat pump subsystem into a switchable cooling mode. The water storage subsystem also includes a temporary holding tank for storing cooled water. The central controller is also configured to, in cooling mode, control the seawater source heat pump subsystem in refrigeration mode according to a second preset rule, to cool the water in the storage tank and send it to the temporary holding tank.

[0007] This embodiment configures the seawater source heat pump subsystem into a reversible operating mode and adds a temporary holding tank, enabling the same system to simultaneously meet the dual needs of heating during the seedling stage and cooling during the temporary holding stage in aquaculture. In heating mode, the heat pump operates in heating mode to provide heat to the seedling tank; in cooling mode, the heat pump switches to cooling mode to provide cooling to the temporary holding tank. This dual-mode design fundamentally solves the problem of energy efficiency degradation of a single heat pump in winter and summer and avoids the need for separate heating and cooling systems. This embodiment achieves dual-mode operation with a single unit, significantly improving equipment utilization and system integration, and greatly reducing initial equipment investment and floor space. Intelligent mode switching ensures the adaptability and economy of the system throughout the year. Compared with traditional single-function systems or two independent systems, this solution can reduce overall operating costs by more than 50% while meeting bidirectional temperature control requirements and significantly reducing carbon emissions.

[0008] In one embodiment, the solar thermal collector subsystem includes a solar collector, a heat collection circulation pump, and a heat collection tank, wherein the heat collection circulation pump drives fluid to circulate between the solar collector and the heat collection tank; The waste heat recovery subsystem for aquaculture wastewater includes a plate heat exchanger. The primary flow path of the plate heat exchanger is connected to the wastewater outlet of the aquaculture pond, and the secondary flow path is connected to the outlet of the water storage tank. The seawater source heat pump subsystem includes a reversible heat pump unit, a source-side circulation pipeline connected to the evaporator of the heat pump unit, and a load-side circulation pipeline connected to the condenser of the heat pump unit. The outlet of the water storage tank can be selectively connected to the secondary side of the plate heat exchanger, the hot water collection tank, or the load-side circulation pipeline of the seawater source heat pump subsystem via a pipeline. The inlet of the seedling water tank can be selectively connected to the outlet of the hot water collection tank or the heated outlet of the load-side circulation pipeline of the seawater source heat pump subsystem via a pipeline. The inlet of the temporary holding tank can be selectively connected to either the cooling outlet or the heating outlet of the seawater source heat pump subsystem via a valve assembly.

[0009] In one embodiment, the first preset rule includes a stepped heating rule, which includes: The water body is first controlled to flow through the aquaculture wastewater waste heat recovery subsystem for primary preheating, and then controlled to flow through the solar thermal collector subsystem for secondary heating. If the water temperature after secondary heating still does not reach the target temperature, the water body is then controlled to flow through the seawater source heat pump subsystem for supplementary heating.

[0010] In one embodiment, the system further includes: A solar radiation sensor is installed in the solar thermal collector subsystem; Multiple temperature sensors are respectively installed in the water storage tank, the seedling water tank, the hot water collection tank, and the wastewater pipeline connected to the aquaculture wastewater waste heat recovery subsystem; Multiple flow control actuators, including a solar collector circulation pump installed in the solar collector subsystem, a wastewater pump and a fresh seawater pump installed in the aquaculture wastewater waste heat recovery subsystem, and a pump and valve installed in the circulation pipeline connected to the load side of the seawater source heat pump subsystem; The central controller is electrically connected to the solar radiation sensor, each temperature sensor, and each flow control actuator, and is configured to: control the opening and closing and operating frequency of the flow control actuator based on the feedback data from the solar radiation sensor and each temperature sensor, so as to automatically select and switch the operating mode in the heating mode. The operating modes include solar collector-only heating mode, seawater source heat pump-only heating mode, solar collector and seawater source heat pump combined heating mode, and aquaculture wastewater waste heat recovery, solar collector and seawater source heat pump combined heating mode.

[0011] In one embodiment, the temperature of the seedling tank is 22°C to 25°C, and the temperature of the temporary holding tank is 8°C to 10°C.

[0012] This invention also provides a multi-functional synergistic temperature regulation method for aquaculture water, applied to any of the systems described above, the method comprising the following steps: The central controller collects a multi-source information set, which includes at least one of the following: the first temperature information of the water storage tank, the second temperature information of the hot water collection tank, the third temperature information of the seedling water tank, the fourth temperature information of the wastewater pipeline connected to the aquaculture wastewater waste heat recovery subsystem, and the solar radiation intensity information of the solar thermal collection subsystem. The central controller, based on a multi-source information set, coordinates the aquaculture wastewater waste heat recovery subsystem, the solar thermal collector subsystem, and the seawater source heat pump subsystem in heating mode according to the first preset rules to heat the water in the storage tank and send it to the seedling tank. In one embodiment, the first preset rule includes a stepped heating rule, which includes: The water body is first controlled to flow through the aquaculture wastewater waste heat recovery subsystem for primary preheating, and then controlled to flow through the solar thermal collector subsystem for secondary heating. If the water temperature after secondary heating still does not reach the target temperature, the water body is then controlled to flow through the seawater source heat pump subsystem for supplementary heating.

[0013] In one embodiment, the first preset rule further includes automatically selecting an operating mode based on the multi-source information set; The operating modes include: If the first temperature information reaches or exceeds the third temperature information, the direct supply mode of natural seawater is activated. If the first temperature information is lower than the third temperature information, and the solar radiation intensity information is higher than the first preset threshold, and the second temperature information reaches or exceeds the third temperature information, then the solar collector separate heating mode is activated. If the first temperature information is lower than the third temperature information, and the solar radiation intensity information is lower than the second preset threshold, and the second temperature information does not reach the third temperature information, then the seawater source heat pump standalone heating mode is activated. If the first temperature information is lower than the third temperature information, and the solar radiation intensity information is lower than the first preset threshold but higher than the second preset threshold, and the second temperature information reaches or exceeds the third temperature information, and the fourth temperature information indicates that there is no effective residual heat, then the combined solar thermal collector and seawater source heat pump heating mode is activated. If the first temperature information is lower than the third temperature information, and the solar radiation intensity information is lower than the first preset threshold but higher than the second preset threshold, and the second temperature information does not reach the third temperature information, and the fourth temperature information indicates the existence of effective waste heat, then the combined heating mode of aquaculture wastewater waste heat recovery, solar thermal collection and seawater source heat pump is activated.

[0014] In one embodiment, the method further includes a cooling mode execution step, which includes: The central controller collects the first temperature information of the water storage tank and the fifth temperature information of the temporary holding water tank; Based on the first temperature information and the fifth temperature information, the central controller controls the seawater source heat pump subsystem in cooling mode according to the second preset rule to cool the water in the storage tank and send it to the temporary holding tank. The second preset rule includes: if the water temperature of the first temperature information is not higher than the cooling target temperature, then control it to be directly transported to the temporary holding tank; otherwise, start the seawater source heat pump subsystem for cooling.

[0015] This invention integrates a solar thermal collector subsystem, a seawater source heat pump subsystem, and an aquaculture wastewater waste heat recovery subsystem, and coordinates these components under the control of a central controller according to a first preset rule, constructing a multi-energy coordinated heating system. This system effectively overcomes the inherent limitations of single-energy systems: the instability of solar energy is mitigated by a stable and reliable seawater source heat pump, while the recovery and utilization of wastewater waste heat directly reduces the system's total heating load. The coordinated control by the central controller enables the system to intelligently prioritize the use of zero-cost solar energy and waste heat resources, minimizing reliance on electrically driven heat pumps. This fundamentally improves the system's overall energy efficiency, significantly reducing operating costs and carbon emissions compared to traditional single-heat-source systems, providing reliable technical support for achieving green and energy-saving aquaculture production. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural block diagram of a multi-energy synergistic temperature regulation system for aquaculture water according to the first embodiment of the present invention; Figure 2 This is a flowchart of a multi-functional synergistic temperature regulation method for aquaculture water according to a second embodiment of the present invention; Figure 3 A detailed flowchart of the water supply operation mode of the seedling water tank according to the second embodiment of the present invention; Figure 4 This is a flowchart illustrating one of the water supply operation modes of the seedling water tank according to the second embodiment of the present invention. Figure 5This is a flowchart of the second water supply operation mode of the seedling water tank according to the second embodiment of the present invention; Figure 6 This is a flowchart of the third water supply operation mode of the seedling water tank according to the second embodiment of the present invention; Figure 7 This is a flowchart illustrating the fourth water supply operation mode of the seedling water tank according to the second embodiment of the present invention. Figure 8 This is a flowchart of the fifth water supply operation mode of the seedling water tank according to the second embodiment of the present invention; Figure 9 This is a flowchart of the sixth water supply operation mode of the seedling water tank according to the second embodiment of the present invention; Figure 10 This is a detailed flowchart of the cooling process according to the second embodiment of the present invention; Figure 11 This is a flowchart illustrating one of the water supply operation modes of the temporary holding water tank according to the second embodiment of the present invention. Figure 12 This is a flowchart of the second water supply operation mode of the temporary holding water tank according to the second embodiment of the present invention; Figure 13 This is a flowchart of the third water supply operation mode of the temporary holding water tank according to the second embodiment of the present invention; Figure 14 This is a flowchart of the fourth operation mode of the temporary holding water tank water supply according to the second embodiment of the present invention. Detailed Implementation

[0018] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0019] To fully understand this invention, detailed steps and structures will be presented in the following description to illustrate the technical solution of this invention. Preferred embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0020] First embodiment: Please refer to Figure 1 As shown, this embodiment of the invention provides a multi-functional synergistic temperature regulation system for aquaculture water, comprising: A solar thermal collector system is used to absorb solar energy to heat water. The seawater source heat pump subsystem is configured to have at least a heating mode; The wastewater heat recovery subsystem for aquaculture is configured to preheat the water body using the wastewater discharged from the aquaculture ponds; The water storage subsystem includes a water storage tank for storing water and a seedling water tank for storing water after it has been heated. The central controller is connected to the solar thermal collector subsystem, the seawater source heat pump subsystem, the aquaculture wastewater waste heat recovery subsystem, and the water storage subsystem. The central controller is configured to, at least in the heating mode, coordinately control the aquaculture wastewater waste heat recovery subsystem, the solar thermal collection subsystem, and the seawater source heat pump subsystem in the heating mode according to a first preset rule, so as to heat the water in the storage tank and send it to the seedling water tank.

[0021] In one embodiment, the seawater source heat pump subsystem is also configured to switchable cooling modes; The water storage subsystem also includes a temporary holding tank for storing cooled water. The central controller is also configured to, in cooling mode, control the seawater source heat pump subsystem in refrigeration mode according to a second preset rule, to cool the water in the storage tank and send it to the temporary holding tank.

[0022] This embodiment configures the seawater source heat pump subsystem in a reversible operation mode and adds a temporary holding tank, enabling the same system to simultaneously meet the dual needs of heating during the seedling stage and cooling during the temporary holding stage in aquaculture. In heating mode, the heat pump operates in heating mode to provide heat to the seedling tank; in cooling mode, the heat pump switches to cooling mode to provide cooling to the temporary holding tank. This dual-mode design avoids the need for separate heating and cooling systems, significantly improving equipment utilization and system integration. It greatly reduces initial equipment investment and floor space, while intelligent mode switching ensures the system's adaptability and economy throughout the year.

[0023] In one embodiment, the solar thermal collector subsystem includes a solar collector, a heat collection circulation pump, and a heat collection tank, wherein the heat collection circulation pump drives fluid to circulate between the solar collector and the heat collection tank; The waste heat recovery subsystem for aquaculture wastewater includes a plate heat exchanger. The primary flow path of the plate heat exchanger is connected to the wastewater outlet of the aquaculture pond, and the secondary flow path is connected to the outlet of the water storage tank. The seawater source heat pump subsystem includes a reversible heat pump unit, a source-side circulation pipeline connected to the evaporator of the heat pump unit, and a load-side circulation pipeline connected to the condenser of the heat pump unit. The outlet of the water storage tank can be selectively connected to the secondary side of the plate heat exchanger, the hot water collection tank, or the load-side circulation pipeline of the seawater source heat pump subsystem via a pipeline. The inlet of the seedling water tank can be selectively connected to the outlet of the hot water collection tank or the heated outlet of the load-side circulation pipeline of the seawater source heat pump subsystem via a pipeline. The inlet of the temporary holding tank can be selectively connected to either the cooling outlet or the heating outlet of the seawater source heat pump subsystem via a valve assembly.

[0024] The "selective connectivity" is achieved by setting up valve groups consisting of electric valves or three-way valves controlled by a central controller at key pipeline nodes. The controller controls the opening and closing combinations of these valves through programming logic, thereby precisely guiding the water flow through a preset path and achieving switching between different operating modes. As a preferred solution rather than a limitation of this embodiment, in certain sea areas during specific seasons (such as winter in the Yellow and Bohai Seas), the natural seawater temperature may be close to 0℃-5℃. When seawater needs to be drawn for temporary holding / purification, since the suitable temperature for the temporary holding tank is 8℃ to 10℃, it is necessary to heat the seawater rather than cool it down. In this case, the central controller controls the valve group connected to the inlet of the temporary holding tank to connect with the heated outlet of the seawater source heat pump subsystem to meet the temporary holding temperature requirements for that specific season.

[0025] In this embodiment, the solar thermal collector subsystem achieves heat transfer between the collector and the hot water tank through a collector circulation pump; the aquaculture wastewater waste heat recovery subsystem achieves efficient heat exchange between wastewater and freshly introduced seawater through a plate heat exchanger; and the seawater source heat pump subsystem extracts and releases heat through a reversible heat pump unit and matching circulation pipelines. The various water tanks are connected by selectable pipelines, providing the hardware foundation for multiple operating modes. This embodiment, through its modular system design, enables each subsystem to operate independently or collaboratively. The pipeline connection scheme provides the structural basis for the cascade utilization of energy, ensuring the flexibility and reliability of system operation.

[0026] In one embodiment, the first preset rule includes a stepped heating rule, which includes: The water body is first controlled to flow through the aquaculture wastewater waste heat recovery subsystem for primary preheating, and then controlled to flow through the solar thermal collector subsystem for secondary heating. If the water temperature after secondary heating still does not reach the target temperature, the water body is then controlled to flow through the seawater source heat pump subsystem for supplementary heating.

[0027] This embodiment prioritizes initial heating using wastewater heat, which has the lowest cost, followed by further heating using free solar energy, and finally, activation of a more energy-intensive heat pump for precise temperature control. This energy utilization sequence—waste heat first, then solar energy, and finally electricity—ensures a reasonable match between energy quality and energy demand. Through tiered energy utilization, the efficiency of low-grade energy is maximized, while the use of high-grade electricity is minimized, significantly reducing system operating costs and improving overall energy efficiency.

[0028] In one embodiment, the system further includes: A solar radiation sensor is installed in the solar thermal collector subsystem; Multiple temperature sensors are respectively installed in the water storage tank, the seedling water tank, the hot water collection tank, and the wastewater pipeline connected to the aquaculture wastewater waste heat recovery subsystem; Multiple flow control actuators, including a solar collector circulation pump installed in the solar collector subsystem, a wastewater pump and a fresh seawater pump installed in the aquaculture wastewater waste heat recovery subsystem, and a pump and valve installed in the circulation pipeline connected to the load side of the seawater source heat pump subsystem; The central controller is electrically connected to the solar radiation sensor, each temperature sensor, and each flow control actuator, and is configured to: control the opening and closing and operating frequency of the flow control actuator based on the feedback data from the solar radiation sensor and each temperature sensor, so as to automatically select and switch the operating mode in the heating mode. The operating modes include solar collector-only heating mode, seawater source heat pump-only heating mode, solar collector and seawater source heat pump combined heating mode, and aquaculture wastewater waste heat recovery, solar collector and seawater source heat pump combined heating mode.

[0029] This embodiment constructs a complete closed-loop control system encompassing sensing, decision-making, and execution. A solar radiation sensor monitors solar energy availability, multiple temperature sensors collect real-time temperature data from key nodes, and the central controller determines the optimal operating mode based on this data. Seamless switching between modes is achieved by controlling the opening and closing of pumps and valves and their operating frequencies. This enables fully automated intelligent operation of the system, ensuring it always operates in the most energy-efficient mode under current conditions, reducing manual intervention, and improving system stability and economy.

[0030] In one embodiment, the temperature of the seedling tank is 22°C to 25°C, and the temperature of the temporary holding tank is 8°C to 10°C. The temperature range of 22°C to 25°C is most suitable for the seedling stage of most aquatic species, promoting healthy seedling growth; while the lower temperature range of 8°C to 10°C is suitable for the purification and temporary holding stage of adults, effectively reducing metabolism, extending survival time, and improving product quality. Through precise temperature control, the most suitable temperature environment is provided for different breeding stages, ensuring the healthy growth of the cultured organisms and improving the quality and economic value of the final product.

[0031] This invention integrates a solar thermal collector subsystem, a seawater source heat pump subsystem, and an aquaculture wastewater waste heat recovery subsystem, and coordinates these components under the control of a central controller according to a first preset rule, constructing a multi-energy coordinated heating system. This system effectively overcomes the inherent limitations of single-energy systems: the instability of solar energy is mitigated by a stable and reliable seawater source heat pump, while the recovery and utilization of wastewater waste heat directly reduces the system's total heating load. The coordinated control by the central controller enables the system to intelligently prioritize the use of zero-cost solar energy and waste heat resources, minimizing reliance on electrically driven heat pumps. This fundamentally improves the system's overall energy efficiency, significantly reducing operating costs and carbon emissions compared to traditional single-heat-source systems, providing reliable technical support for achieving green and energy-saving aquaculture production.

[0032] Second embodiment: Please refer to Figure 2 As shown, a multi-functional synergistic temperature regulation method for aquaculture water is applied to the system in the first embodiment above. The method includes steps S21-S22: S21, the central controller collects a multi-source information set, which includes at least one of the following: the first temperature information of the water storage tank, the second temperature information of the hot water collection tank, the third temperature information of the seedling water tank, the fourth temperature information of the wastewater pipeline connected to the aquaculture wastewater waste heat recovery subsystem, and the solar radiation intensity information of the solar thermal collection subsystem. S22, the central controller, based on a multi-source information set, coordinates the aquaculture wastewater waste heat recovery subsystem, the solar thermal collection subsystem, and the seawater source heat pump subsystem in heating mode according to the first preset rules, to heat the water in the storage tank and send it to the seedling water tank.

[0033] Step S21 above involves real-time acquisition of operating parameters from key nodes of the system via a distributed sensor network, forming a complete system state model. In step S22, the central controller dynamically adjusts the collaborative working strategy of the three subsystems based on this real-time data and the system state model, achieving closed-loop control from data acquisition to intelligent execution. Steps S21-S22, by establishing an intelligent decision-making mechanism based on multi-source information fusion, ensure that the system can select the optimal operating strategy according to real-time operating conditions, achieving a leap from passive control to active optimization, and significantly improving the system's response speed and control accuracy.

[0034] Specifically, the aforementioned first preset rule includes a tiered heating rule, which is specifically as follows: The water body is first controlled to flow through the aquaculture wastewater waste heat recovery subsystem for primary preheating, and then controlled to flow through the solar thermal collector subsystem for secondary heating. If the water temperature after secondary heating still does not reach the target temperature, the water body is then controlled to flow through the seawater source heat pump subsystem for supplementary heating. The tiered heating system embodies a precise match between energy quality and energy demand. It first utilizes the residual heat from low-temperature wastewater for initial heating, then employs medium-temperature solar energy for further enhancement, and finally uses high-grade electricity for fine-tuning the temperature. This tiered energy utilization method ensures that each energy source functions within its optimal temperature range. The tiered heating system achieves quality-based energy utilization, avoiding energy devaluation losses from using high-grade energy in low-grade heating processes, and significantly improving the overall system efficiency.

[0035] Specifically, the first preset rule also includes automatically selecting the operating mode based on the multi-source information set; Please refer to Figure 3 As shown, the operating mode includes steps S31-S36: S31, if the first temperature information reaches or exceeds the third temperature information, then the direct supply mode of natural seawater is activated.

[0036] Please refer to Figure 4 As shown, when the ambient water temperature meets the aquaculture requirements, the system automatically skips all heating steps and directly delivers natural seawater to the aquaculture ponds. This mode avoids unnecessary energy consumption through intelligent judgment. By making full use of natural conditions during suitable seasons, zero-energy operation is achieved, significantly reducing the overall operating cost of the system.

[0037] S32, if the first temperature information is lower than the third temperature information, and the solar radiation intensity information is higher than the first preset threshold, and the second temperature information reaches or exceeds the third temperature information, then the solar collector separate heating mode is activated.

[0038] Please refer to Figure 5 As shown, when there is sufficient sunshine and the solar thermal collector subsystem can independently meet the heating demand, the system prioritizes pure solar heating. In this mode, only the collector circulation pump operates, resulting in extremely low energy consumption. By maximizing the use of clean solar energy, near-zero-cost heating is achieved, with absolutely no carbon emissions, resulting in significant environmental benefits.

[0039] S33, if the first temperature information is lower than the third temperature information, and the solar radiation intensity information is lower than the second preset threshold, and the second temperature information does not reach the third temperature information, then the seawater source heat pump standalone heating mode is activated.

[0040] The first and second preset thresholds are critical values ​​of solar radiation intensity preset based on local solar energy resource data and system thermal performance. For example, the first preset threshold can be set to 500 W / m², which is considered to be above this value as sufficient solar energy; the second preset threshold can be set to 200 W / m², which is considered to be below this value as severely insufficient solar energy, and values ​​between the two are considered to be below which solar energy can assist in heating.

[0041] Please refer to Figure 6 As shown, during periods of extreme solar energy scarcity, such as at night or during prolonged periods of cloudy or rainy weather, the system automatically switches to a heat pump-only heating mode. In this mode, ensuring reliable heating is the primary objective, guaranteeing reliable operation under all weather conditions and providing a stable temperature for aquaculture production.

[0042] S34, if the first temperature information is lower than the third temperature information, and the solar radiation intensity information is lower than the first preset threshold but higher than the second preset threshold, and the second temperature information reaches or exceeds the third temperature information, and the fourth temperature information indicates that there is no effective residual heat, then the combined heating mode of solar thermal collector and seawater source heat pump is activated.

[0043] The effective waste heat referred to in this embodiment refers to the portion of heat energy contained in wastewater that is technically and economically worth recovering and utilizing. When the wastewater temperature is higher than the preset difference of the seawater to be heated, it is determined that the energy-saving benefits brought by the recovery are greater than the cost consumed in the recovery process.

[0044] Please refer to Figure 7 As shown, when solar energy provides some heat but is insufficient to independently complete the heating process under normal sunshine conditions, the system adopts a combination of solar preheating and heat pump supplemental heating. Solar preheating significantly increases the inlet water temperature of the heat pump, thereby improving the operating conditions of the heat pump and increasing its COP value by approximately 15%-25%, achieving a synergistic effect of 1+1>2.

[0045] S35, if the first temperature information is lower than the third temperature information, and the solar radiation intensity information is lower than the first preset threshold but higher than the second preset threshold, and the second temperature information does not reach the third temperature information, and the fourth temperature information indicates the existence of effective waste heat, then the combined heating mode of aquaculture wastewater waste heat recovery, solar thermal collection and seawater source heat pump is activated.

[0046] Please refer to Figure 8 As shown, this operating mode represents the system's optimal energy efficiency mode. It fully utilizes two low-cost heat sources—wastewater waste heat and solar energy—for tiered preheating, minimizing the heat pump load. Wastewater waste heat recovery provides a baseline temperature rise, solar energy provides further heating, and the heat pump requires only a small amount of supplemental heating to meet the standards. Through multi-energy complementarity and tiered utilization, the system's overall energy efficiency is maximized while operating costs are minimized, thus maximizing the system's energy-saving benefits.

[0047] S36. When the weather is extremely cold and sunny, and none of the above operating modes can meet the heat load, the combined heating mode of waste heat recovery from aquaculture wastewater, solar thermal collection and seawater source heat pump will be activated, and external hot water will be injected into the seedling tank.

[0048] Please refer to Figure 9 As shown, this operating mode is the system's emergency backup mode. Under extreme conditions, while the system operates all its own heating units at full capacity, it also activates an external heat source supplementation mechanism to ensure that the aquaculture temperature is not affected by severe weather. This operating mode enhances the system's ability to cope with extreme weather by providing reliable heating, thus reducing the risks to aquaculture production.

[0049] Please refer to Figure 10 As shown, the method further includes a cooling mode execution step, which includes steps S41-S43: S41, the central controller collects the first temperature information of the water storage tank and the fifth temperature information of the temporary holding water tank.

[0050] S42, the central controller, based on the first temperature information and the fifth temperature information, controls the seawater source heat pump subsystem in cooling mode according to the second preset rule to cool the water in the storage tank and send it to the temporary holding tank.

[0051] Please refer to Figure 11 The second preset rule includes: if the water temperature of the first temperature information is not higher than the cooling target temperature, then control it to be directly transported to the temporary holding tank; otherwise, please refer to... Figure 12 The seawater source heat pump subsystem is then started for cooling.

[0052] In cooling mode, the system first assesses the natural water temperature conditions and activates active cooling when the ambient water temperature is too high. The heat pump system operates in reverse, transferring heat from the water to the environment to achieve precise temperature control. This provides reliable cooling for aquaculture production during high-temperature seasons and expands the system's applicable seasons and geographical range.

[0053] S43, when the weather is extremely hot and the heat pump cooling capacity is insufficient, the seawater source heat pump subsystem is started to cool the water, and external cold water is injected into the temporary holding tank.

[0054] Please refer to Figure 13 As shown, to address the challenges of extreme high temperatures, this operating mode employs a dual protection mechanism of active cooling and external cold sources. While the heat pump operates at full capacity for cooling, external cold water is introduced for auxiliary cooling, ensuring that the temperature of the temporary holding water remains stable within a safe range. This embodiment constructs a multi-layered cooling protection system, effectively coping with extreme climatic conditions and guaranteeing the survival rate and product quality of farmed organisms during the high-temperature season.

[0055] For an example corresponding to a specific season in a certain sea area (such as winter in the Yellow and Bohai Seas) in the first embodiment above, where the natural seawater temperature is close to 0℃-5℃, please refer to... Figure 14 The second preset rule further includes: if the water temperature of the first temperature information is lower than the target temperature for heating, then the seawater source heat pump subsystem is activated for heating. S22 of this embodiment further includes: When the weather is extremely cold, the central controller, based on the first temperature information and the fifth temperature information, controls the seawater source heat pump subsystem in heating mode according to the second preset rule to heat the water in the storage tank and send it to the temporary holding tank to meet the temporary holding temperature requirements of the specific season.

[0056] The embodiments of this invention transform a multi-energy collaborative system into a highly intelligent organic whole through preset rules and algorithms. Its core advantage lies in achieving a leap from multi-energy coexistence to multi-energy collaboration: the system can perceive energy status and user needs in real time based on a multi-dimensional information set and dynamically decide on the operating strategy with the lowest energy consumption. This adaptive and self-optimizing capability ensures that the system maintains efficient and stable operation under any working conditions, maximizing the energy-saving potential of the hardware system while greatly reducing reliance on operator skills.

[0057] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A multi-functional synergistic temperature regulation system for aquaculture water, characterized in that, include: A solar thermal collector system is used to absorb solar energy to heat water. The seawater source heat pump subsystem is configured to have at least a heating mode; The wastewater heat recovery subsystem for aquaculture is configured to preheat the water body using the wastewater discharged from the aquaculture ponds; The water storage subsystem includes a water storage tank for storing water and a seedling water tank for storing water after it has been heated. The central controller is connected to the solar thermal collector subsystem, the seawater source heat pump subsystem, the aquaculture wastewater waste heat recovery subsystem, and the water storage subsystem. The central controller is configured to, at least in the heating mode, coordinately control the aquaculture wastewater waste heat recovery subsystem, the solar thermal collection subsystem, and the seawater source heat pump subsystem in the heating mode according to a first preset rule, so as to heat the water in the storage tank and send it to the seedling water tank.

2. The system as described in claim 1, characterized in that, The seawater source heat pump subsystem is also configured to switchable cooling modes; The water storage subsystem also includes a temporary holding tank for storing cooled water. The central controller is also configured to, in cooling mode, control the seawater source heat pump subsystem in refrigeration mode according to a second preset rule, to cool the water in the storage tank and send it to the temporary holding tank.

3. The system as described in claim 2, characterized in that, The solar thermal collector subsystem includes a solar collector, a thermal circulation pump, and a hot water tank. The thermal circulation pump drives fluid to circulate between the solar collector and the hot water tank. The waste heat recovery subsystem for aquaculture wastewater includes a plate heat exchanger. The primary flow path of the plate heat exchanger is connected to the wastewater outlet of the aquaculture pond, and the secondary flow path is connected to the outlet of the water storage tank. The seawater source heat pump subsystem includes a reversible heat pump unit, a source-side circulation pipeline connected to the evaporator of the heat pump unit, and a load-side circulation pipeline connected to the condenser of the heat pump unit. The outlet of the water storage tank can be selectively connected to the secondary side of the plate heat exchanger, the hot water collection tank, or the load-side circulation pipeline of the seawater source heat pump subsystem via a pipeline. The inlet of the seedling water tank can be selectively connected to the outlet of the hot water collection tank or the heated outlet of the load-side circulation pipeline of the seawater source heat pump subsystem via a pipeline. The inlet of the temporary holding tank can be selectively connected to either the cooling outlet or the heating outlet of the seawater source heat pump subsystem via a valve assembly.

4. The system according to any one of claims 1 to 3, characterized in that, The first preset rule includes a stepped heating rule, which includes: The water body is first controlled to flow through the aquaculture wastewater waste heat recovery subsystem for primary preheating, and then controlled to flow through the solar thermal collector subsystem for secondary heating. If the water temperature after secondary heating still does not reach the target temperature, the water body is then controlled to flow through the seawater source heat pump subsystem for supplementary heating.

5. The system as described in claim 4, characterized in that, The system also includes: A solar radiation sensor is installed in the solar thermal collector subsystem; Multiple temperature sensors are respectively installed in the water storage tank, the seedling water tank, the hot water collection tank, and the wastewater pipeline connected to the aquaculture wastewater waste heat recovery subsystem; Multiple flow control actuators, including a solar collector circulation pump installed in the solar collector subsystem, a wastewater pump and a fresh seawater pump installed in the aquaculture wastewater waste heat recovery subsystem, and a pump and valve installed in the circulation pipeline connected to the load side of the seawater source heat pump subsystem; The central controller is electrically connected to the solar radiation sensor, each temperature sensor, and each flow control actuator, and is configured to: control the opening and closing and operating frequency of the flow control actuator based on the feedback data from the solar radiation sensor and each temperature sensor, so as to automatically select and switch the operating mode in the heating mode. The operating modes include solar collector-only heating mode, seawater source heat pump-only heating mode, solar collector and seawater source heat pump combined heating mode, and aquaculture wastewater waste heat recovery, solar collector and seawater source heat pump combined heating mode.

6. The system as described in claim 5, characterized in that, The temperature of the seedling water tank is 22°C to 25°C, and the temperature of the temporary holding water tank is 8°C to 10°C.

7. A multi-functional synergistic temperature regulation method for aquaculture water, characterized in that, Applied to the system as described in any one of claims 1 to 6, the method comprises the following steps: The central controller collects a multi-source information set, which includes at least one of the following: the first temperature information of the water storage tank, the second temperature information of the hot water collection tank, the third temperature information of the seedling water tank, the fourth temperature information of the wastewater pipeline connected to the aquaculture wastewater waste heat recovery subsystem, and the solar radiation intensity information of the solar thermal collection subsystem. The central controller, based on a multi-source information set, coordinates the aquaculture wastewater waste heat recovery subsystem, the solar thermal collection subsystem, and the seawater source heat pump subsystem in heating mode according to the first preset rules, so as to heat the water in the storage tank and send it to the seedling water tank.

8. The method as described in claim 7, characterized in that, The first preset rule includes a stepped heating rule, which includes: The water body is first controlled to flow through the aquaculture wastewater waste heat recovery subsystem for primary preheating, and then controlled to flow through the solar thermal collector subsystem for secondary heating. If the water temperature after secondary heating still does not reach the target temperature, the water body is then controlled to flow through the seawater source heat pump subsystem for supplementary heating.

9. The method as described in claim 8, characterized in that, The first preset rule also includes automatically selecting the operating mode based on the multi-source information set; The operating modes include: If the first temperature information reaches or exceeds the third temperature information, the direct supply mode of natural seawater is activated. If the first temperature information is lower than the third temperature information, and the solar radiation intensity information is higher than the first preset threshold, and the second temperature information reaches or exceeds the third temperature information, then the solar collector separate heating mode is activated. If the first temperature information is lower than the third temperature information, and the solar radiation intensity information is lower than the second preset threshold, and the second temperature information does not reach the third temperature information, then the seawater source heat pump standalone heating mode is activated. If the first temperature information is lower than the third temperature information, and the solar radiation intensity information is lower than the first preset threshold but higher than the second preset threshold, and the second temperature information reaches or exceeds the third temperature information, and the fourth temperature information indicates that there is no effective residual heat, then the combined solar thermal collector and seawater source heat pump heating mode is activated. If the first temperature information is lower than the third temperature information, and the solar radiation intensity information is lower than the first preset threshold but higher than the second preset threshold, and the second temperature information does not reach the third temperature information, and the fourth temperature information indicates the existence of effective waste heat, then the combined heating mode of aquaculture wastewater waste heat recovery, solar thermal collection and seawater source heat pump is activated.

10. The method as described in claim 7, characterized in that, The method further includes a cooling mode execution step, which includes: The central controller collects the first temperature information of the water storage tank and the fifth temperature information of the temporary holding water tank; Based on the first temperature information and the fifth temperature information, the central controller controls the seawater source heat pump subsystem in cooling mode according to the second preset rule to cool the water in the storage tank and send it to the temporary holding tank. The second preset rule includes: if the water temperature of the first temperature information is not higher than the cooling target temperature, then control it to be directly transported to the temporary holding tank; otherwise, start the seawater source heat pump subsystem for cooling.

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