Method and device for controlling solution balance of open heat source tower system

Abstract

The present invention discloses a method and apparatus for controlling the solution balance of an open heat source tower system. The method includes an initial supply solution addition mode, a heating solution addition mode, a low concentration balance mode, a high concentration balance mode, a heat source tower liquid level balance mode, a self-balancing concentration mode, and a solution recovery mode. By real-time monitoring of the liquid levels in the concentrated solution tank, the dilute solution tank, the liquid level inside the heat source tower, the ambient temperature around the heat source tower, the solution concentration inside the heat source tower, and the freezing point of the solution in the heat source tower, the target concentration of the solution in the heat source tower is calculated. The solution is added to the heat source tower from the stirring tank, the dilute solution in the dilute solution tank, or the concentrated solution in the concentrated solution tank through the solution addition and recovery device, or the solution in the heat source tower is recovered. This achieves solution balance in the initial heat source tower system, reduces unit losses and energy consumption caused by system imbalance, and improves system energy efficiency.

Description

Technical Field

[0001] This invention relates to the field of heat source tower technology, and specifically to a method and apparatus for controlling the solution balance of an open heat source tower system. Background Technology

[0002] Heat pump systems using heat source towers are currently widely used winter heating systems. Open heat source towers have the advantages of simple structure and low cost. However, when operating in winter, the antifreeze in an open heat source tower is in direct contact with the air. Since the saturated water vapor partial pressure of the antifreeze is usually lower than that of the water vapor partial pressure in the humid air, water vapor in the air will be spontaneously drawn into the antifreeze, causing its concentration to gradually decrease and its freezing point to rise. This may cause the solution to freeze in the cold weather, resulting in equipment damage and affecting the safe operation of the system.

[0003] Furthermore, open-loop heat pump systems experience fluctuations in parameters such as the freezing point, concentration, and system / dilute / concentrated solution tank levels due to varying environmental conditions like ambient temperature and humidity. This leads to unstable system operation; high solution concentration results in poor heat exchange, while low concentrations cause freezing, damaging the unit and shortening its lifespan. Currently, there is no method for collecting these parameters and providing timely solutions to control their concentration, resulting in poor energy efficiency for heat pump systems.

[0004] Patent application CN 118757961A discloses a heat source tower heat pump concentration control system and assembly. This system can adjust the solution concentration under different conditions. However, before the start of winter heating, antifreeze needs to be added to the system. The controller is in seasonal filling mode, and antifreeze from the dilute solution tank enters the heat source tower. Furthermore, when the antifreeze concentration in the system pipeline meets normal operating requirements, but the liquid level in the heat source tower and the dilute solution tank are both too low to allow sufficient dilute solution to be added to the system pipeline, the controller switches to water filling mode, directly adding water to the heat source tower. Therefore, when the heat source tower is first put into use, the required solution concentration cannot be guaranteed to be suitable, and only the solution from the dilute solution tank can be used. Moreover, when the liquid level in the heat source tower is low, directly adding water will dilute the solution, failing to meet the usage requirements. Therefore, it is necessary to develop a control method and device for adding, recovering, and adjusting the concentration of solution at each stage of operation of an open heat source tower heat pump system to achieve solution balance and promote efficient and stable system operation. Summary of the Invention

[0005] To address the existing technical problems, this invention provides a method and apparatus for controlling the solution balance of an open heat source tower system. This method controls the addition, recovery, and concentration adjustment of the solution at each stage of the operation of the open heat source tower heat pump system to achieve solution balance in the open heat source tower system, reduce unit losses and energy consumption caused by system imbalance, and improve system energy efficiency.

[0006] The technical solution of this invention is: a method for controlling the solution balance of an open heat source tower system, the method including initial supply solution addition mode, heating solution addition mode, low concentration balance mode, high concentration balance mode, heat source tower liquid level balance mode, self-balancing concentration mode and solution recovery mode; through centralized control, different modes are operated to add, concentrate and recover the heat source tower solution in a timely manner, and adjust and balance the solution of the open heat source tower system in a timely manner.

[0007] By real-time monitoring of the liquid levels in the concentrated solution tank, the dilute solution tank, the heat source tower, the ambient temperature around the heat source tower, the solution concentration in the heat source tower, and the freezing point of the solution in the heat source tower, the target concentration of the solution in the heat source tower is calculated. When adding solution to the heat source tower, the solution in the stirring tank, the dilute solution in the dilute solution tank, or the concentrated solution in the concentrated solution tank is added to the heat source tower through the solution addition and recovery device, so that the solution in the heat source tower reaches the target concentration and the set target liquid level; thereby ensuring that the freezing point of the solution in the heat source tower is lower than the current ambient temperature around the heat source tower.

[0008] When concentrating and recovering the solution in the heat source tower, the solution inside the heat source tower is dried and concentrated by the tower's fan. Once the concentration of the solution in the heat source tower reaches the target concentration, the solution is recovered to the concentrated solution tank through a solution addition and recovery device. During the concentration process, the target concentration ensures that the freezing point of the solution in the heat source tower is lower than the ambient temperature surrounding the tower. During the recovery process, the target concentration ensures that all the solution in the heat source tower is recovered.

[0009] The initial solution addition mode specifically includes: when the heat source tower is first commissioned and used, it enters the initial solution addition mode. At this time, the liquid levels of the concentrated solution tank and the dilute solution tank of the heat source tower are below the low pressure level. The target concentration of the solution in the heat source tower is calculated by real-time monitoring of the ambient temperature around the heat source tower. The concentration of the solution equipped with the stirring tank is the same as the target concentration. The solution in the stirring tank is added to the heat source tower through the solution addition and recovery device so that the solution in the heat source tower reaches the target concentration and the set target liquid level, thereby making the freezing point of the solution in the heat source tower lower than the current ambient temperature around the heat source tower.

[0010] The heating solution addition mode specifically includes: when the heat source tower starts to operate, the heat source tower enters the heating solution addition mode. At this time, the liquid level in the heat source tower is below the low-pressure liquid level, and the liquid level in the concentrated solution tank is above the low-pressure liquid level. The target concentration of the solution in the heat source tower is calculated by monitoring the ambient temperature around the heat source tower in real time. The volume of concentrated solution and water to be added is calculated according to the target concentration. The concentrated solution in the concentrated solution tank and the water in the stirring tank are added to the heat source tower through the solution addition and recovery device, so that the solution in the heat source tower reaches the target concentration and the set target liquid level, thereby making the freezing point of the solution in the heat source tower lower than the current ambient temperature around the heat source tower.

[0011] The low-concentration equilibrium mode specifically includes: during the operation of the heat source tower, the solution concentration inside the heat source tower decreases. The target concentration of the solution inside the heat source tower is calculated by real-time monitoring of the ambient temperature surrounding the heat source tower. When the solution concentration inside the heat source tower is lower than the target concentration, and the liquid level inside the heat source tower is below the low-pressure level, the volume of concentrated solution to be added is calculated based on the target concentration. Then, it is determined whether the liquid level of the solution inside the heat source tower exceeds the set high liquid level after adding the corresponding volume of concentrated solution. If it does not exceed the high liquid level of the heat source tower, concentrated solution from the concentrated solution tank is added to the heat source tower through a solution addition and recovery device. The process ensures that the solution inside the heat source tower reaches the target concentration and set target liquid level, making the freezing point of the solution inside the heat source tower lower than the current ambient temperature around the heat source tower. When the high liquid level of the heat source tower is exceeded, the volume of solution to be recovered from the heat source tower and the volume of concentrated solution to be added are first calculated based on the target concentration. Then, the solution in the heat source tower is recovered to the dilute solution tank through the solution addition and recovery device. Finally, the concentrated solution from the concentrated solution tank is added to the heat source tower through the solution addition and recovery device, so that the solution inside the heat source tower reaches the target concentration and set target liquid level, making the freezing point of the solution inside the heat source tower lower than the current ambient temperature around the heat source tower.

[0012] The high-concentration equilibrium mode specifically includes: during the operation of the heat source tower, the concentration of the solution inside the heat source tower increases. By monitoring the ambient temperature around the heat source tower in real time, the target concentration of the solution inside the heat source tower is calculated. When the concentration of the solution inside the heat source tower is higher than the target concentration and the liquid level inside the heat source tower is below the low-pressure liquid level, the volume of dilute solution and water to be added is calculated according to the target concentration. The dilute solution from the dilute solution tank and the water from the stirring tank are added to the heat source tower through the solution addition and recovery device, so that the solution inside the heat source tower reaches the target concentration and the set target liquid level, and the freezing point of the solution inside the heat source tower is lower than the current ambient temperature around the heat source tower.

[0013] The liquid level balance mode of the heat source tower specifically includes: during the operation of the heat source tower, the liquid level of the solution inside the heat source tower changes. By monitoring the ambient temperature around the heat source tower in real time, the target concentration of the solution inside the heat source tower is calculated. When the liquid level inside the heat source tower is below the low-pressure level, and the liquid level of the concentrated solution tank is above the low-pressure level, and the liquid level of the dilute solution tank is above the low-pressure level, the volume of concentrated or dilute solution to be added, as well as the volume of water, is calculated according to the target concentration. Concentrated solution from the concentrated solution tank or dilute solution from the dilute solution tank and water from the stirring tank are added to the heat source tower through the solution addition and recovery device, so that the solution inside the heat source tower reaches the target concentration and the set target liquid level, and the freezing point of the solution inside the heat source tower is lower than the current ambient temperature around the heat source tower.

[0014] The self-balancing concentration mode specifically includes: when the heating operation is about to end and the number of operating heat source towers decreases, the target concentration of the solution in the heat source tower is calculated by real-time monitoring of the ambient temperature around the heat source tower; when the concentration of the dilute solution in the dilute solution tank is lower than the target concentration and the liquid level in the concentrated solution tank is below the low-pressure liquid level, the dilute solution in the dilute solution tank is added to the idle heat source tower through the solution addition and recovery device, and the liquid level in the heat source tower is monitored in real time; when the liquid level in the heat source tower reaches the set liquid level of the self-balancing concentration mode, the solution addition and recovery device is turned off, and the fan of the idle heat source tower is turned on to dry and concentrate the dilute solution in the heat source tower through the fan, and the concentration of the solution in the heat source tower is monitored in real time; when the concentration of the solution in the heat source tower reaches the target concentration, the freezing point of the solution in the heat source tower is lower than the current ambient temperature around the heat source tower, and the solution in the heat source tower is recovered to the concentrated solution tank through the solution addition and recovery device, and the liquid level in the concentrated solution tank is monitored in real time to ensure that the liquid level in the concentrated solution tank does not exceed the set maximum liquid level of the concentrated solution tank.

[0015] The solution recovery mode specifically includes: when the heat source tower stops supplying heat, the heat source tower enters the solution recovery mode, at which time the liquid level in the heat source tower is higher than zero; by real-time monitoring of the liquid level in the heat source tower, the volume of solution in the heat source tower that needs to be recovered is calculated; by real-time monitoring of the liquid level in the dilute solution tank, the remaining volume in the dilute solution tank is calculated; by real-time monitoring of the liquid level in the concentrated solution tank, the remaining volume in the concentrated solution tank is calculated; the target concentration that needs to be concentrated for the complete recovery of the solution in the heat source tower is calculated; the solution in the heat source tower is recovered to the dilute solution tank through the solution addition and recovery device; when the liquid level in the dilute solution tank reaches the set maximum liquid level in the dilute solution tank, the solution addition and recovery device is turned off, and the fan in the heat source tower is turned on to dry and concentrate the remaining solution in the heat source tower; the concentration of the solution in the heat source tower is monitored in real time; when the concentration of the solution in the heat source tower reaches the target concentration, the solution in the heat source tower is recovered to the concentrated solution tank through the solution addition and recovery device, and the liquid level in the heat source tower is monitored in real time to bring the liquid level in the heat source tower back to zero.

[0016] Furthermore, the heat source tower system also receives the ambient temperature around the heat source tower during the same period of previous years. The calculated target concentration of the solution in the heat source tower should not only ensure that the freezing point of the solution in the heat source tower is lower than the current ambient temperature around the heat source tower, but also lower than the ambient temperature around the heat source tower during the same period of previous years.

[0017] A control device for solution balance in an open heat source tower system includes a solution addition and recovery device, a concentrated solution tank, a dilute solution tank, an open heat source tower, and a stirring tank. The concentrated solution tank and the dilute solution tank are respectively connected to the open heat source tower through the solution addition and recovery device, and the stirring tank is connected to the solution addition and recovery device.

[0018] The stirring tank is used to precisely add water to the solution addition and recovery device, or to prepare a solution of a corresponding concentration according to the target concentration of the solution in the open heat source tower and precisely add it to the solution addition and recovery device.

[0019] The concentrated solution tank is used to store the concentrated solution required by the open heat source tower.

[0020] The dilute solution tank is used to store the dilute solution required by the open heat source tower.

[0021] The open-type heat source tower collects low-grade heat energy from the outdoor air, which is then transferred to the heat pump unit via a circulating water system. The heated circulating water then releases the heat into the indoor space through terminal equipment.

[0022] The solution addition and recovery device includes electric valves, a water pump, and a centralized control device; the electric valves include concentrated solution addition and recovery electric valves, dilute solution addition and recovery electric valves, concentrated solution replenishment electric valves, dilute solution replenishment electric valves, solution replenishment electric valve I, solution replenishment electric valve II, solution recovery electric valves, and solution addition electric valves; the concentrated solution addition and recovery electric valves are used to add concentrated solution to the concentrated solution tank or recover concentrated solution from the heat source tower; the dilute solution addition and recovery electric valves are used to add dilute solution to the dilute solution tank or recover dilute solution from the heat source tower; the concentrated solution... The liquid replenishment electric valve is used to replenish concentrated solution from the concentrated solution tank into the heat source tower; the dilute solution replenishment electric valve is used to replenish dilute solution from the dilute solution tank into the heat source tower; the solution replenishment electric valve I and solution replenishment electric valve II are used to replenish solution from the concentrated solution tank or dilute solution tank into the heat source tower; the solution recovery electric valve is used in conjunction with the concentrated solution addition and recovery electric valve or the dilute solution addition and recovery electric valve to recover the solution in the heat source tower from the concentrated solution tank or the dilute solution tank; the solution addition electric valve is used to pump the solution from the stirring tank into the concentrated solution tank, the dilute solution tank, or the heat source tower;

[0023] The water pump is used to pressurize the solution entering the solution addition and recovery device and then output it through a corresponding electric valve;

[0024] The centralized control device is connected to a solution freezing point detection device for the heat source tower, an ambient temperature detection device for the heat source tower, a liquid level detection device for the concentrated solution tank, a liquid level detection device for the dilute solution tank, and a liquid level detection device for the heat source tower. It is used for data acquisition, data processing, and control of electric valves. The acquired data includes the liquid level of the concentrated solution tank, the liquid level of the dilute solution tank, the liquid level inside the heat source tower, the ambient temperature around the heat source tower, the solution concentration inside the heat source tower, and the freezing point of the solution in the heat source tower.

[0025] By adopting the above technical solution, the beneficial effects achieved by the present invention are as follows:

[0026] (1) This invention collects detailed parameters within the open heat source tower system, including the liquid level of the concentrated solution tank, the liquid level of the dilute solution tank, the liquid level inside the heat source tower, the ambient temperature around the heat source tower, the solution concentration inside the heat source tower, and the freezing point of the solution in the heat source tower. Through centralized control, it operates in different modes, adds, concentrates, and recovers the solution in the heat source tower in a timely manner, and adjusts and balances the solution in the open heat source tower system in a timely manner, ensuring that the system is in a stable operating state, reducing unit losses and energy consumption caused by the unbalanced operation of the heat source tower system, and significantly improving the system energy efficiency.

[0027] (2) In existing technologies, the solution added during the initial commissioning of the heat source tower is usually a solution directly transported from a dilute solution tank into the heat source tower. This makes it impossible to adjust the concentration according to the current ambient temperature. However, this invention can calculate the appropriate solution concentration based on collected ambient temperature data, prepare the solution of the appropriate concentration using a stirring tank, and then transport it into the heat source tower via a solution addition and recovery device. This facilitates efficient and stable operation of the heat source tower system from the start of commissioning. It enables the addition of a solution of appropriate concentration into the heat source tower during its initial operation, maintaining solution balance within the system.

[0028] (3) When an open heat source tower is running during normal heating season, a separate solution concentration device is used to concentrate the solution inside the heat source tower. However, when the heating season is about to end and the number of operating heat source towers decreases, the stopped heat source tower system cannot provide a heat source for the solution concentration device, resulting in the stopped heat source towers being unable to concentrate the solution. In the self-balancing concentration mode of this invention, the fan of the stopped heat source tower is turned on to enhance the heat exchange between the solution and the air inside the heat source tower, causing the water in the solution to evaporate and the solution to concentrate inside the heat source tower, thereby increasing the concentration of the solution inside the heat source tower. Since the open heat source tower uses packing for heat exchange, only the fan of the heat source tower needs to be turned on, without the heat source tower itself needing to operate, to achieve the concentration of the solution inside the heat source tower. This is suitable for solution concentration and recovery when there are idle heat source towers near or after the end of the heating season, significantly improving the energy efficiency of the system.

[0029] (4) The present invention uses a solution addition and recovery device to replenish the heat source tower with dilute solution in the dilute solution tank, concentrated solution in the concentrated solution tank, or water in the stirring tank. Alternatively, solutions of different concentrations can be prepared in the stirring tank according to system requirements and then added to the heat source tower precisely. The solution in the heat source tower can also be recovered to the dilute solution tank or concentrated solution tank according to the concentration. The pipeline is simple, the utilization rate is high, the solution transportation path is flexible, and it is not easy to have a failure.

[0030] (5) This invention not only adjusts the concentration of the solution in the heat source tower in a timely manner according to the change of ambient temperature, but also takes into full account the ambient temperature of previous years to determine the appropriate concentration of the solution in the heat source tower, so that the target concentration of the solution in the heat source tower is more reasonable and the operation of the whole system is more stable. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structural principle of the solution balance control method for the open heat source tower system of the present invention;

[0032] Figure 2 This is a schematic diagram of the solution addition and recovery device of the present invention;

[0033] Figure 3 This is a schematic diagram of the initial solution addition mode of the present invention;

[0034] Figure 4 This is a schematic diagram of the heating solution addition mode of the present invention;

[0035] Figure 5 This is a schematic diagram of the low-concentration equilibrium mode of the present invention;

[0036] Figure 6 This is a schematic diagram of the high-concentration equilibrium mode of the present invention;

[0037] Figure 7 This is a schematic diagram of the liquid level balance mode of the heat source tower of the present invention;

[0038] Figure 8 This is a schematic diagram of the self-balancing concentration mode of the present invention;

[0039] Figure 9 This is a schematic diagram of the solution recovery mode of the present invention.

[0040] In the diagram, 1. Electric valve for adding and recovering concentrated solution; 2. Electric valve for adding and recovering dilute solution; 3. Electric valve for replenishing concentrated solution; 4. Electric valve for replenishing dilute solution; 5. Electric valve I for replenishing solution; 6. Electric valve II for replenishing solution; 7. Electric valve for recovering solution; 8. Electric valve for adding solution; 9. Water pump; 10. Centralized control device. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to specific embodiments.

[0042] Example 1

[0043] like Figures 1-9 As shown, a method for controlling the solution balance of an open heat source tower system includes an initial supply solution addition mode, a heating solution addition mode, a low concentration balance mode, a high concentration balance mode, a heat source tower liquid level balance mode, a self-balancing concentration mode, and a solution recovery mode. Through centralized control, different modes are operated to add, concentrate, and recover the heat source tower solution in a timely manner, thereby adjusting and balancing the solution in the open heat source tower system.

[0044] By real-time monitoring of the liquid levels in the concentrated solution tank, the dilute solution tank, the heat source tower, the ambient temperature around the heat source tower, the solution concentration in the heat source tower, and the freezing point of the solution in the heat source tower, the target concentration of the solution in the heat source tower is calculated. When adding solution to the heat source tower, the solution in the stirring tank, the dilute solution in the dilute solution tank, or the concentrated solution in the concentrated solution tank is added to the heat source tower through the solution addition and recovery device, so that the solution in the heat source tower reaches the target concentration and the set target liquid level; thereby ensuring that the freezing point of the solution in the heat source tower is lower than the current ambient temperature around the heat source tower.

[0045] When concentrating and recovering the solution in the heat source tower, the solution inside the heat source tower is dried and concentrated by the tower's fan. Once the concentration of the solution in the heat source tower reaches the target concentration, the solution is recovered to the concentrated solution tank through a solution addition and recovery device. During the concentration process, the target concentration ensures that the freezing point of the solution in the heat source tower is lower than the ambient temperature surrounding the tower. During the recovery process, the target concentration ensures that all the solution in the heat source tower is recovered.

[0046] like Figure 3 As shown, the initial solution addition mode specifically includes: when the heat source tower is first commissioned and used, it enters the initial solution addition mode. At this time, the liquid levels of the concentrated solution tank and the dilute solution tank of the heat source tower are below the low pressure level. The target concentration of the solution in the heat source tower is calculated by real-time monitoring of the ambient temperature around the heat source tower. The concentration of the solution equipped with the stirring tank is the same as the target concentration. The solution in the stirring tank is added to the heat source tower through the solution addition and recovery device so that the solution in the heat source tower reaches the target concentration and the set target liquid level, thereby making the freezing point of the solution in the heat source tower lower than the current ambient temperature around the heat source tower.

[0047] Furthermore, in the initial solution addition mode, when the solution is equipped with a stirring tank, the solute and solvent are added to the stirring tank and stirred evenly.

[0048] After entering the initial solution addition mode, the control first opens the solution addition and recovery electric valve 8, solution replenishment electric valve I 5, and solution replenishment electric valve II 6. After 5 minutes, the water pump 9 is turned on, and the solution enters the solution addition and recovery device from the stirring tank through the solution addition electric valve 8. After being pressurized by the water pump 9, it is pumped into the open heat source tower through the solution replenishment electric valve I 5 and solution replenishment electric valve II 6. After 10 minutes, the liquid level of the open heat source tower is monitored in real time to see if it reaches the target concentration and the set target liquid level.

[0049] Furthermore, in the initial solution addition mode, after the concentrated solution is prepared in the mixing tank, the solution addition and recovery electric valve 8 and the concentrated solution addition and recovery electric valve 1 are opened. After 5 minutes, the water pump 9 is turned on to pressurize and pump the concentrated solution prepared in the mixing tank into the concentrated solution tank. After the dilute solution is prepared in the mixing tank, the solution addition and recovery electric valve 8 and the dilute solution addition and recovery electric valve 2 are opened. After 5 minutes, the water pump 9 is turned on to pressurize and pump the dilute solution prepared in the mixing tank into the dilute solution tank.

[0050] Once the liquid level in the open heat source tower reaches the target concentration and the set target liquid level, first control to shut down water pump 9, then close the electric valve, and the initial supply solution addition mode ends, exiting the initial supply solution addition mode.

[0051] like Figure 4 As shown, the heating solution addition mode specifically includes: when the heat source tower starts to operate, the heat source tower enters the heating solution addition mode. At this time, the liquid level in the heat source tower is below the low-pressure liquid level, and the liquid level in the concentrated solution tank is above the low-pressure liquid level. The target concentration of the solution in the heat source tower is calculated by monitoring the ambient temperature around the heat source tower in real time. The volume of concentrated solution and water to be added is calculated according to the target concentration. The concentrated solution in the concentrated solution tank and the water in the stirring tank are added to the heat source tower through the solution addition and recovery device, so that the solution in the heat source tower reaches the target concentration and the set target liquid level, thereby making the freezing point of the solution in the heat source tower lower than the current ambient temperature around the heat source tower.

[0052] After entering the heating solution addition mode, the control first opens the concentrated solution replenishment electric valve 3, solution replenishment electric valve I 5, and solution replenishment electric valve II 6. After 5 minutes, the water pump 9 is turned on, and the calculated amount of concentrated solution enters the solution addition and recovery device from the bottom of the concentrated solution tank through the concentrated solution replenishment electric valve 3. After being pressurized by the water pump 9, it is pumped into the open heat source tower through the solution replenishment electric valve I 5 and solution replenishment electric valve II 6. After the concentrated solution addition is completed, the concentrated solution replenishment electric valve 3 is closed, and the solution addition electric valve 8 is opened to pump the calculated amount of water into the mixing tank. Then, it enters the solution addition and recovery device through the solution addition electric valve 8. After being pressurized by the water pump 9, it is pumped into the open heat source tower through the solution replenishment electric valve I 5 and solution replenishment electric valve II 6. After 10 minutes, the water and concentrated solution are fully mixed in the heat source tower. The solution in the heat source tower is then checked to see if it has reached the set target liquid level and target concentration.

[0053] Once the solution in the heat source tower reaches the set target level and concentration, first control the water pump 9 to shut off, then close the electric valve, ending the heating solution adding mode and exiting the heating solution adding mode.

[0054] like Figure 5 As shown, the low-concentration equilibrium mode specifically includes: during the operation of the heat source tower, the solution concentration inside the heat source tower decreases. The target concentration of the solution inside the heat source tower is calculated by real-time monitoring of the ambient temperature around the heat source tower. When the solution concentration inside the heat source tower is lower than the target concentration, and the liquid level inside the heat source tower is below the low-pressure level, the volume of concentrated solution to be added is calculated based on the target concentration. Then, it is determined whether the liquid level of the solution inside the heat source tower exceeds the set high liquid level of the heat source tower after adding the corresponding volume of concentrated solution. If it does not exceed the high liquid level of the heat source tower, concentrated solution from the concentrated solution tank is added to the heat source tower through a solution addition and recovery device. This process ensures that the solution inside the heat source tower reaches the target concentration and set target liquid level, making the freezing point of the solution inside the heat source tower lower than the current ambient temperature around the heat source tower. When the high liquid level of the heat source tower is exceeded, the volume of solution to be recovered from the heat source tower and the volume of concentrated solution to be added are first calculated based on the target concentration. Then, the solution in the heat source tower is recovered to the dilute solution tank through the solution addition and recovery device. Finally, the concentrated solution from the concentrated solution tank is added to the heat source tower through the solution addition and recovery device, so that the solution inside the heat source tower reaches the target concentration and set target liquid level, making the freezing point of the solution inside the heat source tower lower than the current ambient temperature around the heat source tower.

[0055] After entering the low concentration equilibrium mode, when the total volume of the concentrated solution to be added and the original volume of the solution in the heat source tower does not exceed the set high liquid level of the heat source tower, the concentrated solution replenishment electric valve 3, solution replenishment electric valve I 5 and solution replenishment electric valve II 6 are opened. After 5 minutes, the water pump 9 is turned on, and the concentrated solution enters the solution addition and recovery device from the bottom of the concentrated solution tank through the concentrated solution replenishment electric valve 3. After being pressurized by the water pump 9, it is pumped into the open heat source tower through the solution replenishment electric valve I 5 and solution replenishment electric valve II 6. After 10 minutes, the solution concentration in the heat source tower is checked to see if it reaches the target concentration and whether the liquid level reaches the set target liquid level.

[0056] When the total volume of the concentrated solution to be added and the original volume of the solution in the heat source tower exceeds the set high liquid level of the heat source tower, the solution recovery electric valve 7 and the dilute solution addition and recovery electric valve 2 are opened. After 5 minutes, the water pump 9 is turned on, and the calculated volume of solution to be recovered in the heat source tower is introduced into the solution addition and recovery device through the solution recovery electric valve 7. After being pressurized by the water pump 9, it is recovered into the dilute solution tank through the dilute solution addition and recovery electric valve 2. After the recovery is completed, the solution recovery electric valve 7 and the dilute solution addition and recovery electric valve 2 are closed, and the concentrated solution replenishment electric valve 3, the solution replenishment electric valve I 5, and the solution replenishment electric valve II 6 are opened. After 10 minutes, it is checked whether the solution concentration in the heat source tower has reached the target concentration and whether the liquid level has reached the set target liquid level.

[0057] Once the solution in the heat source tower reaches the target concentration and the set target liquid level, first control to shut down water pump 9, then close the electric valve, ending the low concentration balance mode and exiting the low concentration balance mode.

[0058] like Figure 6 As shown, the high-concentration equilibrium mode specifically includes: during the operation of the heat source tower, the concentration of the solution in the heat source tower increases. By monitoring the ambient temperature around the heat source tower in real time, the target concentration of the solution in the heat source tower is calculated. When the concentration of the solution in the heat source tower is higher than the target concentration and the liquid level in the heat source tower is below the low-pressure liquid level, the volume of dilute solution and water to be added is calculated according to the target concentration. The dilute solution from the dilute solution tank and the water from the stirring tank are added to the heat source tower through the solution addition and recovery device, so that the solution in the heat source tower reaches the target concentration and the set target liquid level, and the freezing point of the solution in the heat source tower is lower than the current ambient temperature around the heat source tower.

[0059] After entering the high-concentration equilibrium mode, control the opening of dilute solution replenishment electric valves 4, I, and II. After 5 minutes, turn on water pump 9. The dilute solution enters the solution addition and recovery device from the bottom of the dilute solution tank through dilute solution replenishment electric valve 4. After being pressurized by water pump 9, it is pumped into the open heat source tower through solution replenishment electric valves I and II. After the dilute solution is added, close dilute solution replenishment electric valve 4 and open solution addition electric valve 8 to pump the calculated amount of water into the stirring tank. Then, it enters the solution addition and recovery device through solution addition electric valve 8. After being pressurized by water pump 9, it is pumped into the open heat source tower through solution replenishment electric valves I and II. After 10 minutes, the water and solution are fully mixed in the heat source tower. Check whether the solution in the heat source tower has reached the set target liquid level and target concentration.

[0060] Once the solution in the heat source tower reaches the target concentration and the set target liquid level, first control to shut down water pump 9, then close the electric valve, and the high concentration balance mode ends and exits.

[0061] like Figure 7 As shown, the liquid level balance mode of the heat source tower specifically includes: during the operation of the heat source tower, the liquid level of the solution in the heat source tower changes. By monitoring the ambient temperature around the heat source tower in real time, the target concentration of the solution in the heat source tower is calculated. When the liquid level in the heat source tower is below the low pressure level, and the liquid level in the concentrated solution tank is above the low pressure level, and the liquid level in the dilute solution tank is above the low pressure level, the volume of concentrated or dilute solution to be added, as well as the volume of water, are calculated according to the target concentration. Concentrated solution from the concentrated solution tank or dilute solution from the dilute solution tank and water from the stirring tank are added to the heat source tower through the solution addition and recovery device, so that the solution in the heat source tower reaches the target concentration and the set target liquid level, and the freezing point of the solution in the heat source tower is lower than the current ambient temperature around the heat source tower.

[0062] After entering the liquid level balance mode of the heat source tower, control the opening of the concentrated solution replenishment electric valve 3 or the dilute solution replenishment electric valve 4, solution replenishment electric valve I 5, and solution replenishment electric valve II 6. After 5 minutes, start the water pump 9. The calculated amount of concentrated solution enters the solution addition and recovery device from the bottom of the concentrated solution tank through the concentrated solution replenishment electric valve 3, or the dilute solution enters the solution addition and recovery device from the bottom of the dilute solution tank through the dilute solution replenishment electric valve 4. After being pressurized by the water pump 9, it is pumped into the open heat source tower through the solution replenishment electric valves I 5 and II 6. After the solution addition is completed, close the concentrated solution replenishment electric valve 3 or the dilute solution replenishment electric valve 4, open the solution addition electric valve 8, and pump the calculated amount of water into the stirring tank. Then, it enters the solution addition and recovery device through the solution addition electric valve 8. After being pressurized by the water pump 9, it is pumped into the open heat source tower through the solution replenishment electric valves I 5 and II 6. 6. Pour the solution into the open heat source tower. After 10 minutes, the water and solution will be fully mixed in the heat source tower. Check whether the solution in the heat source tower has reached the set target liquid level and target concentration.

[0063] Once the solution in the heat source tower reaches the set target liquid level and target concentration, first control to shut down water pump 9, then close the electric valve, ending the liquid level balance mode of the heat source tower and exiting the liquid level balance mode of the heat source tower.

[0064] like Figure 8 As shown, the self-balancing concentration mode specifically includes: This embodiment 1 includes two sets of heat source towers. When the heating operation is about to end and the number of operating heat source towers decreases, the target concentration of the solution in the heat source tower is calculated by real-time monitoring of the ambient temperature around the heat source tower. When the concentration of the dilute solution in the dilute solution tank is lower than the target concentration and the liquid level in the concentrated solution tank is below the low-pressure liquid level, the dilute solution in the dilute solution tank is added to the idle heat source tower through the solution addition and recovery device. The liquid level in the heat source tower is monitored in real time. When the liquid level in the heat source tower reaches the set liquid level of the self-balancing concentration mode, the solution addition and recovery device is turned off, and the fan of the idle heat source tower is turned on. The fan dries and concentrates the dilute solution in the heat source tower. The concentration of the solution in the heat source tower is monitored in real time. When the concentration of the solution in the heat source tower reaches the target concentration, the freezing point of the solution in the heat source tower is lower than the current ambient temperature around the heat source tower. The solution in the heat source tower is recovered to the concentrated solution tank through the solution addition and recovery device. The liquid level in the concentrated solution tank is monitored in real time to ensure that the liquid level in the concentrated solution tank does not exceed the set maximum liquid level of the concentrated solution tank.

[0065] After entering the self-balancing concentration mode, open the dilute solution replenishment electric valve 4, solution replenishment electric valve I 5, and solution replenishment electric valve II 6. After 5 minutes, turn on the water pump 9 to pump the dilute solution into the idle heat source tower. Monitor the liquid level in the heat source tower in real time. When the liquid level in the heat source tower reaches the set liquid level of the self-balancing concentration mode (usually the highest liquid level of the heat source tower), first turn off the water pump 9, then close the electric valves, and turn on the heat source tower fan to dry and concentrate the dilute solution in the heat source tower. After 10 minutes, monitor the concentration of the solution in the heat source tower in real time. When the concentration of the solution in the heat source tower reaches the target concentration, a concentrated solution is obtained. Send a command to the solution addition and recovery device to open the solution recovery electric valve 7 and the concentrated solution addition and recovery electric valve 1. After 5 minutes, turn on the water pump 9 to recover the concentrated solution into the concentrated solution tank. After 10 minutes, monitor the liquid level in the concentrated solution tank in real time to check whether the liquid level in the concentrated solution tank has reached the set maximum liquid level of the concentrated solution tank.

[0066] When the liquid level in the concentrated solution tank reaches the set maximum liquid level, first control to shut down water pump 9, then close the electric valve, and the self-balancing concentration mode ends and exits.

[0067] like Figure 9 As shown, the solution recovery mode specifically includes: when the heat source tower stops supplying heat, the heat source tower enters the solution recovery mode, at which time the liquid level in the heat source tower is higher than zero; by real-time monitoring of the liquid level in the heat source tower, the volume of solution in the heat source tower that needs to be recovered is calculated; by real-time monitoring of the liquid level in the dilute solution tank, the remaining volume in the dilute solution tank is calculated; by real-time monitoring of the liquid level in the concentrated solution tank, the remaining volume in the concentrated solution tank is calculated; the target concentration that needs to be concentrated for the complete recovery of the solution in the heat source tower is calculated; the solution in the heat source tower is recovered to the dilute solution tank through the solution addition and recovery device; when the liquid level in the dilute solution tank reaches the set maximum liquid level in the dilute solution tank, the solution addition and recovery device is turned off, and the fan in the heat source tower is turned on; the remaining solution in the heat source tower is dried and concentrated by the fan; the concentration of the solution in the heat source tower is monitored in real time; when the concentration of the solution in the heat source tower reaches the target concentration, the solution in the heat source tower is recovered to the concentrated solution tank through the solution addition and recovery device, and the liquid level in the heat source tower is monitored in real time to bring the liquid level in the heat source tower to zero.

[0068] After entering the solution recovery mode, control the opening of the dilute solution addition and recovery electric valve 2 and the solution recovery electric valve 7. After 5 minutes, turn on the water pump 9 to recover the solution in the heat source tower to the dilute solution tank. After 10 minutes, monitor the liquid level in the dilute solution tank in real time to see if it has reached the maximum liquid level. When the liquid level in the dilute solution tank reaches the maximum liquid level, turn off the water pump 9 and the electric valve, and turn on the heat source tower fan to concentrate the remaining solution in the heat source tower. When the solution in the heat source tower is concentrated to the target concentration, open the concentrated solution addition and recovery electric valve 1 and the solution recovery electric valve 7. After 5 minutes, turn on the water pump 9 to smoothly transport the concentrated solution in the heat source tower to the concentrated solution tank for storage. After 10 minutes, monitor the liquid level in the heat source tower in real time to see if it has returned to zero.

[0069] Solution recovery mode exit control mode:

[0070] Once the liquid level in the heat source tower reaches zero, first shut down water pump 9, then close the electric valve. The solution recovery mode ends and exits the solution recovery mode.

[0071] Furthermore, the heat source tower system also receives the ambient temperature around the heat source tower during the same period of previous years. The calculated target concentration of the solution in the heat source tower should not only ensure that the freezing point of the solution in the heat source tower is lower than the current ambient temperature around the heat source tower, but also lower than the ambient temperature around the heat source tower during the same period of previous years.

[0072] A control device for solution balance in an open heat source tower system includes a solution addition and recovery device, a concentrated solution tank, a dilute solution tank, an open heat source tower, and a stirring tank. The concentrated solution tank and the dilute solution tank are respectively connected to the open heat source tower through the solution addition and recovery device, and the stirring tank is connected to the solution addition and recovery device.

[0073] The stirring tank is used to add water to the solution addition and recovery device, or to prepare a solution of a corresponding concentration according to the target concentration of the solution in the open heat source tower and add it to the solution addition and recovery device;

[0074] The concentrated solution tank is used to store the concentrated solution required by the open heat source tower.

[0075] The dilute solution tank is used to store the dilute solution required by the open heat source tower.

[0076] The open-type heat source tower collects low-grade heat energy from the outdoor air, which is then transferred to the heat pump unit via a circulating water system. The heated circulating water releases the heat into the indoor space through terminal equipment. In this embodiment 1, the solution addition and recovery device is connected to two sets of open-type heat source towers. When one set of open-type heat source towers stops operating and enters an idle state, the other set of open-type heat source towers operates normally.

[0077] The solution addition and recovery device includes an electric valve, a water pump 9, and a centralized control device; the centralized control device is communicatively connected to the control terminals of the electric valve and the water pump 9.

[0078] The electric valves include a concentrated solution addition and recovery electric valve 1, a dilute solution addition and recovery electric valve 2, a concentrated solution replenishment electric valve 3, a dilute solution replenishment electric valve 4, a solution replenishment electric valve I 5, a solution replenishment electric valve II 6, a solution recovery electric valve 7, and a solution addition electric valve 8. The concentrated solution addition and recovery electric valve 1 is used to add concentrated solution to the concentrated solution tank or recover concentrated solution from the heat source tower. The dilute solution addition and recovery electric valve 2 is used to add dilute solution to the dilute solution tank or recover dilute solution from the heat source tower. The concentrated solution replenishment electric valve 3 is used to replenish concentrated solution from the concentrated solution tank into the heat source tower. The dilute solution replenishment electric valve 4 is used to replenish dilute solution from the dilute solution tank into the heat source tower. The solution replenishment electric valves I 5 and II... 6 is used to replenish the solution from the concentrated solution tank, the dilute solution tank, and the stirring tank into the heat source tower; the solution recovery electric valve 7 is used in conjunction with the concentrated solution addition and recovery electric valve 1 or the dilute solution addition and recovery electric valve 2 to recover the solution in the heat source tower into the concentrated solution tank or the dilute solution tank; the solution addition electric valve 8 is used to pump the solution from the stirring tank into the concentrated solution tank, the dilute solution tank, or the heat source tower.

[0079] The water pump 9 is used to pressurize the solution entering the solution addition and recovery device and then output it through a corresponding electric valve;

[0080] The centralized control device 10 is connected to a solution freezing point detection device for the heat source tower, an ambient temperature detection device for the heat source tower, a liquid level detection device for the concentrated solution tank, a liquid level detection device for the dilute solution tank, and a liquid level detection device for the heat source tower. It is used for data acquisition, data processing, and control of electric valves. The acquired data includes the liquid level of the concentrated solution tank, the liquid level of the dilute solution tank, the liquid level inside the heat source tower, the ambient temperature around the heat source tower, the solution concentration inside the heat source tower, and the freezing point of the solution in the heat source tower.

[0081] The heat source tower, concentrated solution tank, dilute solution tank, solution freezing point detection device, ambient temperature detection device of the heat source tower, liquid level detection device of the concentrated solution tank, liquid level detection device of the dilute solution tank, liquid level detection device of the heat source tower, water pump and centralized control device in this embodiment 1 are existing technologies. Calculating the target concentration of the solution in the heat source tower using various parameters is also an existing technology.

Claims

1. A method for controlling the solution balance in an open heat source tower system, characterized in that: The method includes initial solution addition mode, heating solution addition mode, low concentration balance mode, high concentration balance mode, liquid level balance mode of heat source tower, self-balancing concentration mode and solution recovery mode; through centralized control, different modes are operated to add, concentrate and recover heat source tower solution in a timely manner, and adjust and balance the solution of open heat source tower system in a timely manner. By real-time monitoring of the liquid levels in the concentrated solution tank, the dilute solution tank, the heat source tower, the ambient temperature around the heat source tower, the solution concentration in the heat source tower, and the freezing point of the solution in the heat source tower, the target concentration of the solution in the heat source tower is calculated. When adding solution to the heat source tower, the solution in the stirring tank, the dilute solution in the dilute solution tank, or the concentrated solution in the concentrated solution tank is added to the heat source tower through the solution addition and recovery device, so that the solution in the heat source tower reaches the target concentration and the set target liquid level; thereby ensuring that the freezing point of the solution in the heat source tower is lower than the current ambient temperature around the heat source tower. When concentrating and recovering the solution in the heat source tower, the solution inside the heat source tower is dried and concentrated by the tower's fan. Once the concentration of the solution in the heat source tower reaches the target concentration, the solution is recovered to the concentrated solution tank through a solution addition and recovery device. During the concentration process, the target concentration ensures that the freezing point of the solution in the heat source tower is lower than the ambient temperature surrounding the tower. During the recovery process, the target concentration ensures that all the solution in the heat source tower is recovered.

2. The method for controlling the solution balance of an open heat source tower system according to claim 1, characterized in that: The initial solution addition mode specifically includes: when the heat source tower is first commissioned and used, it enters the initial solution addition mode. At this time, the liquid levels of the concentrated solution tank and the dilute solution tank of the heat source tower are below the low pressure level. The target concentration of the solution in the heat source tower is calculated by real-time monitoring of the ambient temperature around the heat source tower. The concentration of the solution equipped with the stirring tank is the same as the target concentration. The solution in the stirring tank is added to the heat source tower through the solution addition and recovery device so that the solution in the heat source tower reaches the target concentration and the set target liquid level, thereby making the freezing point of the solution in the heat source tower lower than the current ambient temperature around the heat source tower.

3. The method for controlling the solution balance of an open heat source tower system according to claim 1, characterized in that: The heating solution addition mode specifically includes: when the heat source tower starts to operate, the heat source tower enters the heating solution addition mode. At this time, the liquid level in the heat source tower is below the low-pressure liquid level, and the liquid level in the concentrated solution tank is above the low-pressure liquid level. The target concentration of the solution in the heat source tower is calculated by monitoring the ambient temperature around the heat source tower in real time. The volume of concentrated solution and water to be added is calculated according to the target concentration. The concentrated solution in the concentrated solution tank and the water in the stirring tank are added to the heat source tower through the solution addition and recovery device, so that the solution in the heat source tower reaches the target concentration and the set target liquid level, thereby making the freezing point of the solution in the heat source tower lower than the current ambient temperature around the heat source tower.

4. The method for controlling the solution balance of an open heat source tower system according to claim 1, characterized in that: The low-concentration equilibrium mode specifically includes: during the operation of the heat source tower, the solution concentration inside the heat source tower decreases. The target concentration of the solution inside the heat source tower is calculated by real-time monitoring of the ambient temperature surrounding the heat source tower. When the solution concentration inside the heat source tower is lower than the target concentration, and the liquid level inside the heat source tower is below the low-pressure level, the volume of concentrated solution to be added is calculated based on the target concentration. Then, it is determined whether the liquid level of the solution inside the heat source tower exceeds the set high liquid level after adding the corresponding volume of concentrated solution. If it does not exceed the high liquid level of the heat source tower, concentrated solution from the concentrated solution tank is added to the heat source tower through a solution addition and recovery device. The process ensures that the solution inside the heat source tower reaches the target concentration and set target liquid level, making the freezing point of the solution inside the heat source tower lower than the current ambient temperature around the heat source tower. When the high liquid level of the heat source tower is exceeded, the volume of solution to be recovered from the heat source tower and the volume of concentrated solution to be added are first calculated based on the target concentration. Then, the solution in the heat source tower is recovered to the dilute solution tank through the solution addition and recovery device. Finally, the concentrated solution from the concentrated solution tank is added to the heat source tower through the solution addition and recovery device, so that the solution inside the heat source tower reaches the target concentration and set target liquid level, making the freezing point of the solution inside the heat source tower lower than the current ambient temperature around the heat source tower.

5. The method for controlling the solution balance of an open heat source tower system according to claim 1, characterized in that: The high-concentration equilibrium mode specifically includes: during the operation of the heat source tower, the concentration of the solution inside the heat source tower increases. By monitoring the ambient temperature around the heat source tower in real time, the target concentration of the solution inside the heat source tower is calculated. When the concentration of the solution inside the heat source tower is higher than the target concentration and the liquid level inside the heat source tower is below the low-pressure liquid level, the volume of dilute solution and water to be added is calculated according to the target concentration. The dilute solution from the dilute solution tank and the water from the stirring tank are added to the heat source tower through the solution addition and recovery device, so that the solution inside the heat source tower reaches the target concentration and the set target liquid level, and the freezing point of the solution inside the heat source tower is lower than the current ambient temperature around the heat source tower.

6. The method for controlling the solution balance of an open heat source tower system according to claim 1, characterized in that: The liquid level balance mode of the heat source tower specifically includes: during the operation of the heat source tower, the liquid level of the solution inside the heat source tower changes. By monitoring the ambient temperature around the heat source tower in real time, the target concentration of the solution inside the heat source tower is calculated. When the liquid level inside the heat source tower is below the low-pressure level, and the liquid level of the concentrated solution tank is above the low-pressure level, and the liquid level of the dilute solution tank is above the low-pressure level, the volume of concentrated or dilute solution to be added, as well as the volume of water, is calculated according to the target concentration. Concentrated solution from the concentrated solution tank or dilute solution from the dilute solution tank and water from the stirring tank are added to the heat source tower through the solution addition and recovery device, so that the solution inside the heat source tower reaches the target concentration and the set target liquid level, and the freezing point of the solution inside the heat source tower is lower than the current ambient temperature around the heat source tower.

7. The method for controlling the solution balance of an open heat source tower system according to claim 1, characterized in that: The self-balancing concentration mode specifically includes: when the heating operation is about to end and the number of operating heat source towers decreases, the target concentration of the solution in the heat source tower is calculated by real-time monitoring of the ambient temperature around the heat source tower; when the concentration of the dilute solution in the dilute solution tank is lower than the target concentration and the liquid level in the concentrated solution tank is below the low-pressure liquid level, the dilute solution in the dilute solution tank is added to the idle heat source tower through the solution addition and recovery device, and the liquid level in the heat source tower is monitored in real time; when the liquid level in the heat source tower reaches the set liquid level of the self-balancing concentration mode, the solution addition and recovery device is turned off, and the fan of the idle heat source tower is turned on to dry and concentrate the dilute solution in the heat source tower through the fan, and the concentration of the solution in the heat source tower is monitored in real time; when the concentration of the solution in the heat source tower reaches the target concentration, the freezing point of the solution in the heat source tower is lower than the current ambient temperature around the heat source tower, and the solution in the heat source tower is recovered to the concentrated solution tank through the solution addition and recovery device, and the liquid level in the concentrated solution tank is monitored in real time to ensure that the liquid level in the concentrated solution tank does not exceed the set maximum liquid level of the concentrated solution tank.

8. The method for controlling the solution balance of an open heat source tower system according to claim 1, characterized in that: The solution recovery mode specifically includes: when the heat source tower stops supplying heat, the heat source tower enters the solution recovery mode, at which time the liquid level in the heat source tower is higher than zero; by real-time monitoring of the liquid level in the heat source tower, the volume of solution in the heat source tower that needs to be recovered is calculated; by real-time monitoring of the liquid level in the dilute solution tank, the remaining volume in the dilute solution tank is calculated; by real-time monitoring of the liquid level in the concentrated solution tank, the remaining volume in the concentrated solution tank is calculated; the target concentration that needs to be concentrated for the complete recovery of the solution in the heat source tower is calculated; the solution in the heat source tower is recovered to the dilute solution tank through the solution addition and recovery device; when the liquid level in the dilute solution tank reaches the set maximum liquid level in the dilute solution tank, the solution addition and recovery device is turned off, and the fan in the heat source tower is turned on to dry and concentrate the remaining solution in the heat source tower; the concentration of the solution in the heat source tower is monitored in real time; when the concentration of the solution in the heat source tower reaches the target concentration, the solution in the heat source tower is recovered to the concentrated solution tank through the solution addition and recovery device, and the liquid level in the heat source tower is monitored in real time to bring the liquid level in the heat source tower back to zero.

9. The method for controlling the solution balance of an open heat source tower system according to claim 1, characterized in that: The heat source tower system also receives the ambient temperature around the heat source tower during the same period of previous years. The calculated target concentration of the solution in the heat source tower should not only make the freezing point of the solution in the heat source tower lower than the current ambient temperature around the heat source tower, but also lower than the ambient temperature around the heat source tower during the same period of previous years.

10. A control device for solution balance in an open heat source tower system, used to execute a control method for solution balance in an open heat source tower system as described in any one of claims 1-9, characterized in that, The device includes: a solution addition and recovery device, a concentrated solution tank, a dilute solution tank, an open heat source tower, and a stirring tank. The concentrated solution tank and the dilute solution tank are respectively connected to the open heat source tower through the solution addition and recovery device, and the stirring tank is connected to the solution addition and recovery device. The stirring tank is used to add water to the solution addition and recovery device, or to prepare a solution of a corresponding concentration according to the target concentration of the solution in the open heat source tower and add it to the solution addition and recovery device; The concentrated solution tank is used to store the concentrated solution required by the open heat source tower. The dilute solution tank is used to store the dilute solution required by the open heat source tower. The open heat source tower collects low-grade heat energy from the outdoor air, which is then transferred to the heat pump unit via a circulating water system. The heated circulating water releases the heat into the indoor space through terminal equipment. The solution addition and recovery device includes an electric valve, a water pump (9), and a central control device; the central control device is communicatively connected to the control terminals of the electric valve and the water pump (9); The electric valves include a concentrated solution addition and recovery electric valve (1), a dilute solution addition and recovery electric valve (2), a concentrated solution replenishment electric valve (3), a dilute solution replenishment electric valve (4), a solution replenishment electric valve I (5), a solution replenishment electric valve II (6), a solution recovery electric valve (7), and a solution addition electric valve (8); the concentrated solution addition and recovery electric valve (1) is used to add concentrated solution to the concentrated solution tank or recover concentrated solution from the heat source tower; the dilute solution addition and recovery electric valve (2) is used to add dilute solution to the dilute solution tank or recover dilute solution from the heat source tower; the concentrated solution replenishment electric valve (3) The electric valve (4) is used to replenish concentrated solution from the concentrated solution tank to the heat source tower; the electric valve (5) is used to replenish dilute solution from the dilute solution tank to the heat source tower; the electric valve I (5) and the electric valve II (6) are used to replenish solution from the concentrated solution tank, the dilute solution tank and the stirring tank to the heat source tower; the electric valve (7) is used in conjunction with the electric valve (1) for adding and recovering concentrated solution or the electric valve (2) for adding and recovering solution from the heat source tower to the concentrated solution tank or the dilute solution tank; the electric valve (8) for adding solution from the stirring tank is used to pump the solution from the stirring tank into the concentrated solution tank, the dilute solution tank or the heat source tower. The water pump (9) is used to pressurize the solution entering the solution addition and recovery device and then output it through the corresponding electric valve; The centralized control device is connected to a solution freezing point detection device for the heat source tower, an ambient temperature detection device for the heat source tower, a liquid level detection device for the concentrated solution tank, a liquid level detection device for the dilute solution tank, and a liquid level detection device for the heat source tower. It is used for data acquisition, data processing, and control of electric valves. The acquired data includes the liquid level of the concentrated solution tank, the liquid level of the dilute solution tank, the liquid level inside the heat source tower, the ambient temperature around the heat source tower, the solution concentration inside the heat source tower, and the freezing point of the solution in the heat source tower.

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