A hybrid energy storage air conditioning system with ice and water storage and its control method

Abstract

The present invention provides a hybrid energy storage air conditioning system of ice storage and water storage and a control method thereof; the system includes an ice storage air conditioning module, a supplementary cooling module, multiple water storage air conditioning modules and a water storage tank parallel switching component. The ice storage air conditioning module and the multiple water storage air conditioning modules correspond to different cooling loads respectively. The supplementary cooling module is used to transfer the cooling capacity stored in the ice storage air conditioning module to any one or more water storage air conditioning modules; the water storage tank parallel switching component is used to switch and distribute the cooling components in the water storage system. The present invention organically combines the water storage system and the ice storage system, giving full play to the advantages of the high energy storage density of ice storage, greatly reducing the energy storage volume of the system, and flexibly configuring multiple water storage systems, giving full play to the advantages of the water storage system's wide energy storage temperature range and high cooling release rate, so that the system can efficiently respond to the energy demand of scenarios with variable cooling temperature zones, large load fluctuations, and frequent changes in peak and valley electricity prices.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage air conditioning, and in particular relates to an ice storage and water storage hybrid energy storage air conditioning system and a control method thereof. Background Art

[0002] Energy storage air conditioning technology achieves efficient energy utilization and conservation by storing cooling or heat during periods of low electricity demand and releasing it during peak periods, thereby reducing electricity demand during peak periods. This technology helps balance grid loads and reduce greenhouse gas emissions.

[0003] With the diversification and intelligent development of building functions, the requirements of different areas for environmental parameters such as temperature and humidity have gradually shown obvious differences, and different temperature and humidity controls need to be provided according to their specific uses and the characteristics of human activities.

[0004] The ice storage system has a high energy storage density, but a narrow cold storage temperature range; the water storage system has a fast charging and discharging speed and a wide cold storage temperature range, but has a low energy storage density and takes up a lot of space. A single ice storage or water storage system can generally only correspond to one temperature zone. In projects where the demand for cooling temperature zones is diverse and complex, it is necessary to establish a separate energy storage cooling system based on one temperature demand. The cooling systems of each temperature zone are relatively independent, and the advantages of each cold storage system cannot complement each other. The cooling capacity of each temperature zone in the energy storage facility cannot be flexibly converted, and the control means are very limited, making it difficult to achieve timely and flexible response to complex and changeable load demands. The present invention proposes a hybrid energy storage air-conditioning cooling system and a flexible response control method, which integrates the respective advantages of ice storage and water storage systems to effectively overcome the above difficulties. Summary of the Invention

[0005] The purpose of the present invention is to provide a hybrid energy storage air conditioning cooling system and a flexible response control method, which organically combines ice storage and water storage technologies to achieve rapid response to variable loads and multiple temperature zones and variable loads on the grid side.

[0006] In a first aspect, the present invention provides a hybrid ice and water storage energy storage air conditioning system, comprising an ice storage air conditioning module, a supplemental cooling module, and multiple water storage air conditioning modules. The ice storage air conditioning module and the multiple water storage air conditioning modules correspond to different cooling loads. The water storage air conditioning module comprises a water storage refrigeration unit, a first chilled water pump, and a cooling assembly. The cooling assembly includes a water storage tank. The water storage refrigeration unit and the first chilled water pump are used to generate and deliver chilled water for supply to the water storage tank or cooling loads.

[0007] The supplementary cooling module is used to transfer the cold energy stored in the ice storage air conditioning module to any one or more water storage air conditioning modules; the supplementary cooling module includes a fourteenth valve and a plurality of supplementary cooling heat exchange units. The number of supplementary cooling heat exchange units is equal to and corresponds one to one with the water storage air conditioning modules. The supplementary cooling heat exchange unit includes a supplementary cooling heat exchanger and a supplementary cooling pump. The first heat exchange channel of the supplementary cooling heat exchanger, the supplementary cooling pump, and the corresponding water storage tank are sequentially connected to form a supplementary cooling circulation loop. The fourteenth valve and the second heat exchange channels of the supplementary cooling heat exchangers in the plurality of supplementary cooling heat exchange units are sequentially connected to form a supplementary cooling heat exchange path; the two ends of the supplementary cooling heat exchange path are connected in parallel to the two ends of the cooling load corresponding to the ice storage air conditioning module.

[0008] Preferably, the ice storage air conditioning module and the multiple water storage air conditioning modules correspond to different temperature zones of cooling load. The temperature zone corresponding to the ice storage air conditioning module is the lowest. The temperature zones corresponding to the water storage air conditioning modules increase in sequence along the flow direction of the chilled water in the supplemental cooling heat exchange path.

[0009] Preferably, the system further includes a water-cooled storage tank parallel switching assembly. The cooling assemblies of the plurality of water-cooled storage air conditioning modules are connected via the water-cooled storage tank parallel switching assembly. The water-cooled storage tank parallel switching assembly is configured to control the parallel connection of the cooling assemblies in any plurality of water-cooled storage air conditioning modules by controlling a valve.

[0010] Preferably, the ice storage and water storage hybrid energy storage air conditioning system has multiple operating modes, including independent working mode, ice storage transfer mode, and water storage combined mode.

[0011] In independent operation mode, the water storage tank parallel switching assembly isolates the water storage tanks in all water storage air conditioning modules. Valve 14 in the supplemental cooling module closes, and the supplemental cooling pumps, valves 11, and 12 in all supplemental cooling heat exchange units close. The ice storage air conditioning module and multiple water storage air conditioning modules each provide cooling for their corresponding cooling loads.

[0012] In the ice storage cooling capacity transfer mode, the water storage air-conditioning module that needs cooling supplement is used as the target water storage air-conditioning module; the connection between the water storage tank and the cooling load in the target water storage air-conditioning module is disconnected; the ice storage refrigeration host, ethylene glycol pump and second chilled water pump in the ice storage air-conditioning module are turned on; the fourteenth valve in the cooling supplement module is opened, and the cooling supplement pump in the cooling supplement heat exchange unit corresponding to the target water storage air-conditioning module is turned on; the ice storage air-conditioning module transports chilled water to the cooling supplement heat exchange path; the cooling capacity of the chilled water is exchanged to the cooling supplement circulation loop when passing through the cooling supplement heat exchanger corresponding to the target water storage air-conditioning module, and stored in the water storage tank.

[0013] In the combined water-cooled storage mode, some water-cooled storage air conditioning modules serve as cold storage utilization modules, while others serve as cold storage external supply modules. The cold storage tank parallel switching component connects the cold storage utilization module and the cold storage tanks in the cold storage external supply module in parallel. In the cold storage external supply module, valves 5, 6, 7, and 8 are closed; in the cold storage utilization module, valves 25 and 26 are opened, disconnecting the cold storage tanks in the cold storage external supply module. The disconnected cold storage tanks are then connected in parallel with the cold storage tanks in the cold storage utilization module, and their cold storage capacity is incorporated into the cold storage utilization module.

[0014] Preferably, the number of the water-cooled storage air-conditioning modules is two; the water-cooled storage tank parallel switching component includes a twenty-fifth valve and a twenty-sixth valve; the tops of the water-cooled storage tanks of the two water-cooled storage air-conditioning modules are connected through the twenty-sixth valve; and the bottoms of the water-cooled storage tanks of the two water-cooled storage air-conditioning modules are connected through the twenty-fifth valve.

[0015] Preferably, the water-cooled storage air conditioning module further includes a second valve and a pump-fluid reversing assembly. The first chilled water pump, the second valve, the water-cooled storage refrigeration unit, and the corresponding cooling load are sequentially connected to form a first refrigeration circuit. The cooling storage assembly is connected to the first refrigeration circuit via the pump-fluid reversing assembly. The pump-fluid reversing assembly is used to switch the flow direction of the chilled water, allowing the cooling storage assembly to directly switch between a cooling storage state and a cooling release state.

[0016] Preferably, the cold storage assembly further comprises a ninth valve, a tenth valve, an eleventh valve, and a twelfth valve. The tenth and eleventh valves are respectively provided at the two top manifolds of the cold water storage tank. The ninth and twelfth valves are respectively provided at the two bottom manifolds of the cold water storage tank. The tenth and ninth valves are connected to the pump reversing assembly; the eleventh and twelfth valves are connected to the supplemental cooling module.

[0017] Preferably, the pump-liquid reversing assembly includes a first cold storage pump, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, and an eighth valve. The fifth valve is connected between the top of the cold water storage tank and the input end of the cold water storage refrigeration unit; the sixth valve is connected between the bottom of the cold water storage tank and the output end of the cold water storage refrigeration unit; the third valve and the fourth valve are respectively provided in the two branches leading from the output end of the first cold storage pump, and are respectively connected to the input end and the output end of the cold water storage refrigeration unit; the seventh valve and the eighth valve are respectively provided in the two branches leading from the input end of the first cold storage pump, and are respectively connected to the top and the bottom of the cold water storage tank.

[0018] Preferably, the ice storage air conditioning module includes an ice storage refrigeration unit, a glycol pump, an ice storage tank, a unit cooling heat exchanger, and a second chilled water pump. The glycol pump, ice storage refrigeration unit, the coils within the ice storage tank, and the first heat exchange channel of the unit cooling heat exchanger are sequentially connected to form an ice refrigeration circuit. Valves and short-circuit pipes are connected in parallel at both ends of the ice storage tank and the unit cooling heat exchanger. The second heat exchange channel of the unit cooling heat exchanger, the second chilled water pump, and the corresponding cooling load of the ice storage air conditioning module are sequentially connected to form an ice cooling circuit.

[0019] Preferably, a first valve is connected in parallel between the two ends of the cooling load corresponding to the water-storage cooling air conditioning module, and a twenty-third valve is connected in parallel between the two ends of the cooling load corresponding to the ice-storage cooling air conditioning module.

[0020] In a second aspect, the present invention provides a control method for a hybrid energy storage air conditioning system of ice storage and water storage, which periodically executes the control method of the water storage air conditioning module and the ice storage air conditioning module according to a preset control cycle.

[0021] The control method of the water-cooled air conditioning module is as follows:

[0022] Step 1: According to the cooling load adjustment of each cooling load, each water-cooled storage air-conditioning module is controlled to operate in an independent working mode or a water-cooled storage combined mode.

[0023] Step 2: If the next period is a valley period, enter the full cold storage mode or the storage and supply mode; if the next period is not a valley period, execute step 3.

[0024] Step 3: If the remaining cooling capacity is sufficient to completely cover all the remaining peak-time cooling loads before the next valley-time period, choose to enter the pure cooling condition or the combined cooling condition; if the remaining cooling capacity is insufficient to cover all the remaining peak-time cooling loads before the next valley-time period, proceed to step 4.

[0025] Step 4: If the remaining cooling capacity combined with the water-storage cooling host is insufficient to cope with the load of the remaining period, the water-storage cooling air-conditioning module is switched to the storage-and-supply mode, and the ice storage cooling capacity transfer mode is entered to supplement the cooling capacity of the ice storage cooling air-conditioning module to the water-storage cooling air-conditioning module; if the remaining cooling capacity combined with the water-storage cooling host is sufficient to cope with the load of the remaining period, the combined cooling mode is entered.

[0026] The control method of the ice storage air conditioning module is as follows:

[0027] Step 1: If the next period is a valley period, enter the full cold storage mode or the storage and supply mode, and the ice storage air conditioning module control of the current cycle is completed; if the next period is not a valley period, execute step 2.

[0028] Step 2: If the current cooling capacity of all water-cooled air-conditioning modules is sufficient to cover all remaining peak-time cooling loads before the next valley-time period, then proceed directly to step 3; if the current cooling capacity of some or all water-cooled air-conditioning modules is insufficient to cover all remaining peak-time cooling loads before the next valley-time period, then enter the ice-cooled capacity transfer mode, so that the ice-cooled air-conditioning modules provide cooling for the water-cooled air-conditioning modules.

[0029] Step 3: If the remaining cooling capacity of the ice storage air-conditioning module is insufficient to cover all remaining peak-time cooling loads before the next valley-time period, the system will enter the storage-and-supply mode to replenish the cooling capacity of the ice storage air-conditioning module. If the remaining cooling capacity is sufficient to completely cover all remaining peak-time cooling loads before the next valley-time period, the system will enter the combined cooling mode.

[0030] The present invention has the following beneficial effects:

[0031] 1. The cold storage capacity in different air-conditioning modules of the present invention is dynamically adjustable and can be quickly transferred: Compared with conventional independent cooling supply systems, the present invention can quickly replenish the cold capacity in the ice storage tank to the water storage tank of the water-cooled air-conditioning module through the cold replenishment module, making the energy storage capacity in the air-conditioning modules in different temperature zones dynamically adjustable and integrated. This makes the energy storage equipment more compact and has higher utilization rate, which can effectively reduce system capacity and investment, and achieve rapid response to loads in multiple temperature zones, effectively ensuring energy supply safety.

[0032] 2. The cold storage capacity between different water-cooled air-conditioning modules in the present invention can be flexibly switched to effectively respond to large loads: In response to large-scale changes in periodic loads such as seasonal changes and production line adjustments, conventional cooling systems can only increase investment to expand unit capacity to cope with large loads. The water-cooled tanks of different water-cooled air-conditioning modules in the present invention can be switched through valves, and water-cooled tanks in multiple temperature zones can be merged into the same temperature zone for use. This not only expands the energy storage capacity of the cooling system in this temperature zone, but also can realize continuous transfer of cold in the ice storage by having one tank accept cold supplemented by the ice storage air-conditioning module and the other tank release cold, thereby greatly improving the load response capability of this temperature zone.

[0033] 3. This invention flexibly responds to grid-side dispatching needs and user-side load demands: Through energy storage evaluation and mode switching, the present invention ensures that the cooling capacity within each temperature zone is sufficient to cover the cooling load for the remaining period, effectively addressing the diverse and complex cooling demands of each temperature zone, ensuring system energy supply security, and efficiently responding to grid-side power control input conditions. Furthermore, the present invention can combine factors such as peak and valley electricity prices and load forecasts to perform combined analysis and computational simulation of various operating modes for the remaining time periods of the entire cooling system, significantly improving the system's operating economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1It is a schematic diagram of the overall structure of the present invention.

[0035] Figure 2 This is a structural diagram of the water-cooled air conditioning module in the present invention.

[0036] Figure 3 This is a structural diagram of the ice storage air conditioning module in the present invention.

[0037] Figure 4 This is a control flow chart of the water-cooled air conditioning module in the present invention.

[0038] Figure 5 This is a control flow chart of the ice storage air conditioning module in the present invention. DETAILED DESCRIPTION

[0039] The present invention will be further described below with reference to the accompanying drawings.

[0040] like Figure 1 As shown, a hybrid ice and water storage energy storage air conditioning system includes two water storage air conditioning modules 100, a supplemental cooling module 200, an ice storage air conditioning module 300, and a water storage tank parallel switching assembly 400. This hybrid ice and water storage energy storage air conditioning system can provide three different cooling temperature zones; the cooling temperatures in these three zones decrease sequentially, corresponding to the ice storage air conditioning module 300 and the two water storage air conditioning modules 100. The three different cooling temperature zones correspond to three cooling loads.

[0041] In this embodiment, the hybrid system can concentrate the system cooling capacity mainly in the ice storage air conditioning module 300. Taking the system with a total cooling capacity of 9000RTh as an example, the ice storage tank can be designed with a cooling capacity of 7000RTh and a single water storage tank with a cooling capacity of 1000RTh. In this case, the ice storage tank volume is about 260m 3 , single volume of water cold storage tank is 500m 3 The total volume of the cold storage module is 1260m 3 Conventional ice and water storage solutions are independent and are divided equally according to the storage capacity. The ice storage tank has a storage capacity of 3000RTh and a volume of 115m 3 The cooling capacity of a single water storage tank is 3000RTh, and the volume of a single tank is 1500m 3 The total volume of the cold storage module is 3115m 3 Compared with the conventional system, the hybrid system of the present invention can save 1855m 3 The energy storage capacity has been reduced by nearly 60%.

[0042] like Figure 1 and Figure 2As shown, the water-cooled air conditioning module 100 includes a water-cooled refrigeration unit 120, a first chilled water pump 130, a first valve 101, a second valve 102, a thirteenth valve 113, a cold storage component, and a pump liquid reversing component. The thirteenth valve 113, the first valve 101, and the second valve 102 are electric regulating valves.

[0043] The first chilled water pump 130, the second valve 102, the water-cooled storage refrigeration unit 120, the thirteenth valve 113, and the corresponding cooling load are sequentially connected to form a first refrigeration circuit. The cold storage component is connected to the first refrigeration circuit via a pump fluid reversing component, forming a switchable cold storage and release circuit.

[0044] The cold storage assembly includes a cold water storage tank 140, a ninth valve 109, a tenth valve 110, an eleventh valve 111, and a twelfth valve 112. The ninth, tenth, eleventh, and twelfth valves 109, 110, 111, and 112 are electrically controlled valves. The top water distributor of the cold water storage tank 140 is equipped with two top manifolds; these two top manifolds are respectively equipped with the tenth and eleventh valves 110 and 111, serving as the two hot water inlet and outlet ports for the cold storage assembly. The bottom water distributor of the cold water storage tank 140 is equipped with two bottom manifolds. These two bottom manifolds are respectively equipped with the ninth and twelfth valves 109 and 112, serving as the two cold water inlet and outlet ports for the cold storage assembly.

[0045] The pump-liquid reversing assembly includes a first cold storage pump 150, a third valve 103, a fourth valve 104, a fifth valve 105, a sixth valve 106, a seventh valve 107, and an eighth valve 108. The third valve 103, the fourth valve 104, the fifth valve 105, the sixth valve 106, the seventh valve 107, and the eighth valve 108 are electrically controlled valves.

[0046] The top water distributor of the water storage tank 140 is connected to the input end of the water storage refrigeration host 120 through the tenth valve 110 and the fifth valve 105; the bottom water distributor of the water storage tank 140 is connected to the output end of the water storage refrigeration host 120 through the ninth valve 109, the sixth valve 106, and the thirteenth valve 113.

[0047] The two branches leading out from the output end of the first cold storage pump 150 are respectively provided with a third valve 103 and a fourth valve 104, and are respectively connected to one end of the fifth valve 105 and the sixth valve 106; the two branches leading out from the input end of the first cold storage pump 150 are respectively provided with a seventh valve 107 and an eighth valve 108, and are respectively connected to the other end of the fifth valve 105 and the sixth valve 106.

[0048] The specific connections between the components in the water-cooled air conditioning module 100 are further described as follows: the input of the water-cooled refrigeration unit 120 is connected to one end of the second valve 102, the third valve 103, and the fifth valve 105; the output of the water-cooled refrigeration unit 120 is connected to one end of the thirteenth valve 113. The other end of the second valve 102 is connected to the output of the first chilled water pump 130. The input of the first chilled water pump 130 is connected to the first valve 101 and the output of the corresponding cooling load. The other end of the thirteenth valve 113 is connected to the input of the cooling load, the other end of the first valve 101, and one end of the fourth valve 104 and the sixth valve 106. The other ends of the third valve 103 and the fourth valve 104 are both connected to the output of the first cooling pump 150. The input of the first cooling pump 150 is connected to one end of the seventh valve 107 and the eighth valve 108. The other ends of the fifth valve 105 and the seventh valve 107 are connected to one end of the tenth valve 110. The other ends of the sixth valve 106 and the eighth valve 108 are connected to one end of the ninth valve 109. The top water distributor of the cold water storage tank 140 is connected to the other end of the tenth valve 110 and one end of the eleventh valve 111. The bottom water distributor of the cold water storage tank 140 is connected to the other end of the valve 119 and one end of the twelfth valve 112.

[0049] like Figure 1 As shown, the cold storage components of two water-cooled storage air conditioning modules 100 are arranged in parallel and switched on and off by a water-cooled storage tank parallel switching assembly 400; the water-cooled storage tank parallel switching assembly 400 includes a twenty-fifth valve 401 and a twenty-sixth valve 402. The hot water inlet and outlet interfaces of the cold storage components of the two water-cooled storage air conditioning modules 100 are connected via the twenty-sixth valve 402; the cold water inlet and outlet interfaces of the cold storage components of the two water-cooled storage air conditioning modules 100 are connected via the twenty-fifth valve 401. The twenty-fifth valve 401 is an electrically powered on / off valve, while the twenty-sixth valve 402 is an electrically powered regulating valve.

[0050] like Figure 1 and Figure 3 As shown, the ice storage air conditioning module 300 includes a refrigeration unit 320, an ethylene glycol pump 330, an ice storage tank 340, a unit cooling heat exchanger 350, a second chilled water pump 360, a 15th valve 301, a 16th valve 302, a 17th valve 303, an 18th valve 304, a 19th valve 305, a 20th valve 306, a 21st valve 307, a 22nd valve 308, a 23rd valve 309, and a 24th valve 310. The 15th valve 301, the 16th valve 302, the 17th valve 303, the 18th valve 304, the 21st valve 307, the 22nd valve 308, and the 24th valve 310 are electrically operated on-off valves. The 17th valve 303, the 18th valve 304, the 19th valve 305, the 20th valve 306, the 23rd valve 309, and the 24th valve 310 are electrically operated regulating valves.

[0051] The input of the glycol pump 330 is connected to the input of the ice storage refrigeration unit 320 and one end of the sixteenth valve 302. The output of the ice storage refrigeration unit 320 is connected to one end of the fifteenth valve 301. The other ends of the fifteenth and sixteenth valves 301 and 302 are connected to one end of the twentieth valve 306 and the coil input of the ice storage tank 340. The coil output of the ice storage tank 340 is connected to one end of the nineteenth valve 305. The other ends of the nineteenth and twentieth valves 305 and 306 are connected to one end of the seventeenth and eighteenth valves 304. The other end of the eighteenth valve 304 is connected to one end of the first heat exchange pipe in the unit cooling heat exchanger 350. The other end of the first heat exchange pipe in the unit cooling heat exchanger 350 and the other end of the seventeenth valve 303 are both connected to the input of the glycol pump 330.

[0052] The output end of the second heat exchange pipe in the main cooling heat exchanger 350 is connected to one end of the twenty-first valve 307; the other end of the twenty-first valve 307 is connected to one end of the twenty-second valve 308, the twenty-third valve 309, and the twenty-fourth valve 310; the other end of the twenty-second valve 308 is connected to the input end of the load corresponding to the ice storage air-conditioning module 300; the output end of the load corresponding to the ice storage air-conditioning module 300 and the other end of the twenty-third valve 309 are both connected to the input end of the second heat exchange pipe in the main cooling heat exchanger 350.

[0053] like Figure 1 and Figure 3 As shown, the supplementary cooling module 200 includes a fourteenth valve 201 and two supplementary cooling heat exchange units. The two supplementary cooling heat exchange units correspond to the two water-cooled air conditioning modules 100, respectively. The supplementary cooling heat exchange unit includes a supplementary cooling heat exchanger 202 and a supplementary cooling pump 203. The first heat exchange channel of the supplementary cooling heat exchanger 202, the supplementary cooling pump 203, the twelfth valve 112, the bottom water distributor of the water-cooled storage tank 140, the top water distributor, and the eleventh valve 111 are sequentially connected to form a supplementary cooling circulation loop. The fourteenth valve 201 and the second heat exchange channels of the supplementary cooling heat exchangers 202 in the two supplementary cooling heat exchange units are sequentially connected to form a supplementary cooling heat exchange path; the two ends of the supplementary cooling heat exchange path are connected in parallel between the output end of the supplementary cooling pump 203 and the input end of the second heat exchange pipe in the main cooling heat exchanger 350.

[0054] The cold storage capacity stored in the ice storage tank 340 can be exchanged to the cold storage components of the two water-cooled air-conditioning modules 100 through the cold supplement module 200, so as to improve the ability of the two water-cooled air-conditioning modules 100 to provide cold capacity; at the same time, since the chilled water output by the second chilled water pump 360 passes through the two water-cooled air-conditioning modules 100 in succession; therefore, the cold temperature obtained by heat exchange in the first water-cooled air-conditioning module 100 is lower than the cold temperature obtained by heat exchange in the second water-cooled air-conditioning module 100; thus, the cold supplement temperature can be made to conform to the temperature zones corresponding to the two water-cooled air-conditioning modules 100.

[0055] Based on the above connection structure, the ice storage air conditioning module 300 and the two water storage air conditioning modules 100 are efficiently coupled, which can provide cooling independently and can also be flexibly converted. Through the matching flexible response control method, flexible response of user-side load can be achieved.

[0056] The ice storage and water storage hybrid energy storage air conditioning system provided in this embodiment has multiple operating modes, including an independent working mode, an ice storage capacity transfer mode, and a water storage combined mode.

[0057] Independent working mode:

[0058] In this mode, one ice-storage air conditioning module 300 and two water-storage air conditioning modules 100 each provide cooling for their corresponding cooling loads without affecting each other. The 26th and 25th valves 402 and 401 in the water-storage tank parallel switching assembly 400 are closed; the 14th valve 201 in the supplemental cooling module 200 is closed, and the supplemental cooling pump 203, 11th valve 111, and 12th valve 112 in both supplemental cooling heat exchange units are closed. The valves within the ice-storage air conditioning module 300 and the water-storage air conditioning module 100 are switched according to the actual needs of the corresponding cooling loads.

[0059] Ice storage capacity transfer mode:

[0060] In this mode, the ice-storage air conditioning module 300 (with a larger cooling capacity) supplements the water-storage air conditioning module 100 (with a smaller cooling capacity). If the system detects insufficient cooling capacity in one of the water-storage air conditioning modules 100 (specifically, insufficient cooling capacity means the cooling capacity of the water-storage air conditioning tank 140 is insufficient to meet the load for the next hour, or the remaining cooling capacity in the water-storage air conditioning tank has reached a preset cooling capacity warning threshold), the water-storage refrigeration unit 120, while maintaining cooling capacity, can rapidly recharge the water-storage air conditioning module 100 with the cooling capacity in the ice-storage air conditioning module 300.

[0061] The specific control method of the ice storage cooling capacity transfer mode is as follows: the water storage cooling air-conditioning module 100 that needs supplementary cooling is used as the target water storage cooling air-conditioning module 100; first, the tenth valve 110 and the ninth valve 109 in the target water storage cooling air-conditioning module 100 are closed, so that the water storage tank 140 of the water storage cooling air-conditioning module 100 stops releasing cold; the ice storage cooling host 320, the ethylene glycol pump 330 and the second chilled water pump 360 in the ice storage cooling air-conditioning module 300 are opened; the fourteenth valve 201 in the supplementary cooling module 200 is opened; at the same time, the eleventh valve 111, the twelfth valve 112 and the supplementary cooling pump 203 in the corresponding supplementary cooling heat exchange unit of the target water storage cooling air-conditioning module 100 are opened, so that the supplementary cooling circulation loop corresponding to the target water storage cooling air-conditioning module 100 is connected and starts circulation; by controlling the opening degree of the fourteenth valve 201 and the frequency of the supplementary cooling pump 203, the cooling capacity in the ice storage tank 340 is accurately controlled and accurately transferred to the water storage tank 140. When the cooling is completed, the cooling pump 203, the eleventh valve 111 and the twelfth valve 112 in the cooling heat exchange unit corresponding to the target water-cooled air-conditioning module 100 are closed to stop the cooling; then the tenth valve 110 and the ninth valve 109 in the target water-cooled air-conditioning module 100 can be opened, and the water-cooled storage tank 140 in the target water-cooled air-conditioning module 100 can be released.

[0062] In the cooling capacity transfer mode, two water-cooled air-conditioning modules 100 can be supplied with cooling at the same time. The chilled water pumped by the second chilled water pump 360 passes through two cooling heat exchange units with cooling temperature zones from low to high in sequence. By controlling the opening of the eleventh valve 111 and the twelfth valve 112 in the two water-cooled air-conditioning modules 100 and the frequency of the cooling pump 203 in the two cooling heat exchange units, precise cooling can be achieved.

[0063] In this embodiment, the ice storage tank is the main body of cold storage, and the designed cold storage capacity is large enough. Generally, there is no problem of insufficient cold capacity. When special circumstances occur, the ice storage system enters the storage and supply mode during the off-peak period to replenish the cold capacity in the ice storage tank.

[0064] Water storage and cooling combined mode:

[0065] In this mode, the cold water storage tanks 140 in two water-cooled air conditioning modules 100 are connected in parallel, with the modules acting as a cold storage utilization module and a cold storage external supply module, respectively. The cold storage tanks 140 in the cold storage external supply module supply the cold storage utilization module with cold water. The combined water-cooled air conditioning mode is useful for situations where the system can flexibly adapt to large load changes, such as seasonal changes or temporary production line adjustments.

[0066] The specific control method of the water storage and cooling combined mode is as follows:

[0067] In the cold storage capacity external supply module, the fifth valve 105 , the sixth valve 106 , the seventh valve 107 , and the eighth valve 108 are closed.

[0068] In the cold storage capacity utilization module, the twenty-sixth valve 402 and the twenty-fifth valve 401 are opened.

[0069] The combined water-cooled storage mode is equivalent to integrating the water-cooled storage tank 140 in the cold storage external supply module 100 with the water-cooled storage tank 140 in the cold storage utilization module 100, thereby expanding the storage capacity. Furthermore, the two cold storage tanks can be switched by a valve, allowing one to release cold while the other replenishes it. This allows the cold energy in the ice storage tank to be continuously fed into the cold storage utilization module 100, meeting the high-volume cooling demands of the corresponding cooling loads in the cold storage utilization module.

[0070] Both the ice-storage air conditioning module 300 and the water-storage air conditioning module 100 have multiple operating modes, including full cold storage, pure cold release, combined cold supply, and both cold storage and supply. Full cold storage means the cooling output of the refrigeration unit is stored in the cold storage assembly or ice storage tank 340. Pure cold release means the refrigeration unit is inoperative, using only the cold storage assembly or ice storage tank 340 to provide cooling to the user. Combined cold supply means the refrigeration unit and the cold storage assembly or ice storage tank 340, which stores cold, jointly provide cooling to the user. Both cold storage and supply means the refrigeration unit simultaneously stores cold for the cold storage assembly while providing cooling to the user.

[0071] In the water-cooled storage combined mode, the cold storage external supply module stops working except for the cold storage components; in addition, in any operating mode, the ice-cooled storage air-conditioning module 300 and the water-cooled storage air-conditioning module 100 can be switched arbitrarily under different working conditions to adapt to the requirements of different cold storage and cooling tasks.

[0072] The control methods of the ice storage air conditioning module 300 and the water storage air conditioning module 100 under different working conditions are the same as those of conventional ice storage systems and water storage systems, and are not described in detail here.

[0073] The valve control of the water-cooled storage air-conditioning module 100 under the condition of storing and supplying at the same time is as follows: open the ninth valve 109, the tenth valve 110, the third valve 103, the seventh valve 107, the second valve 102, the thirteenth valve 113, and the sixth valve 106; close the fourth valve 104, the eighth valve 108, the fifth valve 105, the twenty-fifth valve 401, and the twenty-sixth valve 402; turn on the first cold storage pump 150; and store and supply at the same time by adjusting the frequency of the first cold storage pump 150 and the opening of the first valve 101.

[0074] The valve control for the ice-storage air conditioning module 300 in both storage and supply mode is as follows: Close valves 18 and 306; open valves 17 and 305, and the ice-storage refrigeration unit 320 enters ice-making mode. Simultaneously, open valve 24 and close valve 307, and turn on pump 34. By adjusting the pump 34 frequency and the opening of valve 23 and 309, the cooling load corresponding to the ice-storage air conditioning module 300 is met. The low-temperature ethylene glycol output by the ice-storage refrigeration unit 320 not only ensures cooling but also replenishes the cooling capacity in the ice storage tank 340.

[0075] In addition, this embodiment provides a flexible response control method for the above-mentioned ice storage and water storage hybrid energy storage air conditioning system, which can adjust the system according to various load conditions to achieve rapid system switching and accurate load response.

[0076] In this embodiment, the control cycle is 15 minutes, and the control methods of the water-cooled storage air-conditioning module 100 and the ice-cooled storage air-conditioning module 300 are cyclically executed respectively.

[0077] like Figure 4 As shown, the control method of the water-cooled air conditioning module 100 is as follows:

[0078] Step 1: For the water-cooled air-conditioning module 100, first confirm whether the cooling load of the system has been significantly adjusted. By default, this item is not adjusted. When there is a seasonal change, temporary adjustment of the production line, etc., and the cooling load is adjusted significantly in stages, this item is modified to have adjustment through external input instructions, and the water-cooled joint mode is entered to realize the transfer of cooling capacity, thereby increasing the cooling capacity and maximum cooling capacity of the water-cooled air-conditioning module 100 corresponding to the cooling load with increased cooling capacity.

[0079] Step 2: After the cooling capacity allocation is complete, determine whether the next period is an off-peak period. If so, the system selects either a storage-and-supply mode or a full cooling mode, depending on whether there is cooling load during the off-peak period. This completes the control of the water-cooled air conditioning module 100 for the current cycle. If the next period is not an off-peak period, proceed to step 3.

[0080] Step 3: Evaluate the cooling capacity. If the remaining cooling capacity is sufficient to fully cover all remaining peak-hour cooling loads before the next off-peak period, the system selects either pure cooling mode (for peak periods) or combined cooling mode (for normal periods) based on whether the system is currently in a peak-hour period. This completes the control of the water-cooled air conditioning module 100 for the current cycle. If the remaining cooling capacity cannot fully cover all remaining peak-hour cooling loads before the next off-peak period, proceed to step 4.

[0081] Step 4: Determine whether the remaining cooling capacity, combined with the host, is sufficient to handle the remaining load. If this is not sufficient, the entire ice-water storage hybrid energy storage air conditioning system enters ice storage transfer mode, and the water storage air conditioning module 100 switches to simultaneous storage and supply mode, achieving the fastest possible cooling and ensuring energy supply safety. This completes the control of the water storage air conditioning module 100 for the current cycle.

[0082] If the remaining cooling capacity combined with the host is sufficient to cope with the cooling load for the remaining period (i.e., under the premise of ensuring energy supply security), proceed to step 5.

[0083] Step 5: Determine whether a grid-side power control input condition has been received. If a control input condition has been received, a rapid response is performed. If the control input condition is a power-encouraging instruction, a high-power consumption strategy is adopted under the combined cooling mode (a control strategy that maximizes power consumption, such as primarily using the water-storage cooling unit 120 for cooling). If the control input condition is a power-limiting instruction, a low-power consumption strategy is adopted under the combined cooling mode (a control strategy that minimizes power consumption, such as switching to a fully operational water-storage cooling unit 120 for both storage and cooling).

[0084] If no control input conditions are received, a comprehensive analysis is conducted based on the electricity price in the subsequent period and the predicted loads of the three cooling loads, and a combination simulation of various operating modes is performed for the remaining period, and finally the operating mode with the best economic efficiency is selected.

[0085] like Figure 5 As shown, the control method of the ice storage air conditioning module 300 is as follows:

[0086] Step 1: Determine whether the next period is an off-peak period. If so, select either the "storage-and-supply" mode or the "full cooling" mode based on whether there is cooling load during the off-peak period. If not, proceed to step 2.

[0087] Step 2: Evaluate the cooling capacity of each water-cooled air-conditioning module 100. If the current cooling capacity of all water-cooled air-conditioning modules is sufficient to cope with the load of the remaining period, directly proceed to step 3; if the current cooling capacity of some or all water-cooled air-conditioning modules is insufficient to cope with the load of the remaining period, enter the ice cooling capacity transfer mode, so that the ice cooling air-conditioning module 300 provides cooling for the water-cooled air-conditioning module 100, and then proceed to step 3.

[0088] Step 3: Evaluate the cooling capacity of the ice-storage air conditioning module 300. If the remaining cooling capacity is sufficient to fully cover the remaining peak-time cooling load before the next off-peak period, the system selects either pure cooling mode (for peak periods) or combined cooling mode (for normal periods) based on whether the current peak period is in operation. If the remaining cooling capacity cannot fully cover the remaining peak-time cooling load before the next off-peak period, proceed to step 4.

[0089] Step 4: Determine whether the remaining cooling capacity, combined with the host, is sufficient to cover the remaining loads during all periods. If the remaining cooling capacity, combined with the host, is insufficient to cover the remaining loads during all periods, the system switches to a storage-and-supply mode to supplement the ice storage air conditioning module 300's cooling capacity and ensure energy security. If the remaining cooling capacity is sufficient to fully cover the remaining peak-hour cooling load (i.e., energy security can be guaranteed), proceed to step 5.

[0090] Step 5: Determine whether a power control input condition from the grid side is received. If a control input condition is received, respond quickly. If the control input condition is an instruction to encourage electricity consumption, a high-power consumption strategy is adopted under the combined cooling condition (a control strategy that increases power consumption as much as possible, such as switching to a storage and supply condition with the water storage cooling host 120 fully open); if the control input condition is a power restriction instruction, a low-power consumption strategy is adopted under the combined cooling condition (a control strategy that reduces power consumption as much as possible, such as mainly providing cooling by melting ice and releasing cold in the water storage tank 140).

[0091] If no control input conditions are received, a comprehensive analysis is conducted based on the electricity price in the subsequent period and the predicted loads of the three cooling loads, and a combination simulation of various operating modes is performed for the remaining period, and finally the operating mode with the best economic efficiency is selected.

[0092] As can be seen from the above description, this embodiment effectively combines a water-cooled storage system with an ice-cooled storage system to address complex and diverse cooling temperature zone requirements. This not only leverages the high energy storage density of ice-cooled storage, significantly reducing the overall system energy storage volume, but also leverages the wide range of energy storage temperature zones and rapid response of the water-cooled storage system, enabling the system to promptly respond to variable loads in multiple temperature zones simultaneously. Each temperature zone cooling system can operate independently without interfering with each other, while also being efficiently coupled to achieve rapid switching and transfer of cooling capacity. Furthermore, this embodiment efficiently couples the air conditioning modules corresponding to the three different temperature zones, enabling all three modules to simultaneously store and supply cooling capacity. Furthermore, the ice-cooled storage module and the water-cooled storage module can convert stored energy and efficiently supplement cooling capacity, significantly improving the flexibility and continuity of energy storage and cooling release. Therefore, compared to traditional independent ice and water-cooled storage systems, this embodiment provides a richer and more flexible combination of operating modes and a more rapid and effective optimization and control approach.

Claims

1. An ice storage and water storage hybrid energy storage air conditioning system, comprising an ice storage air conditioning module (300), characterized in that: The system further comprises a water storage tank parallel switching component (400), a supplementary cooling module (200) and a plurality of water storage air conditioning modules (100); the ice storage air conditioning module (300) and the plurality of water storage air conditioning modules (100) respectively correspond to different cooling loads; the water storage air conditioning module (100) comprises a water storage refrigeration main unit (120), a first chilled water pump (130) and a cooling component; the cooling component comprises a water storage tank (140); the water storage refrigeration main unit (120) and the first chilled water pump (130) are used to generate and transport chilled water supplied to the water storage tank (140) or the cooling load; The supplementary cooling module (200) is used to transfer the cold energy stored in the ice storage air conditioning module (300) to any one or more water storage air conditioning modules (100); the supplementary cooling module (200) includes a fourteenth valve (201) and a plurality of supplementary cooling heat exchange units; the number of the supplementary cooling heat exchange units is equal to and corresponds to the water storage air conditioning module (100); the supplementary cooling heat exchange units include a supplementary cooling heat exchanger (202) and a supplementary cooling pump (203); the first heat exchange channel of the supplementary cooling heat exchanger (202), the supplementary cooling pump (203), and the corresponding water storage tank (140) are sequentially connected to form a supplementary cooling circulation loop; the fourteenth valve (201) and the second heat exchange channels of the supplementary cooling heat exchangers (202) in the plurality of supplementary cooling heat exchange units are sequentially connected to form a supplementary cooling heat exchange path; the two ends of the supplementary cooling heat exchange path are connected in parallel to the two ends of the corresponding cold load of the ice storage air conditioning module (300); The ice storage air conditioning module (300) and the plurality of water storage air conditioning modules (100) correspond to cooling loads in different temperature zones; the temperature zone corresponding to the ice storage air conditioning module (300) is the lowest; the temperature zones corresponding to the water storage air conditioning modules (100) increase in sequence along the flow direction of the chilled water in the supplementary cooling heat exchange path; The water-cooled storage tank parallel switching component (400) is used to control the parallel connection or disconnection of the cooling components in any of a plurality of water-cooled storage air-conditioning modules (100) through valves; when the cooling components in a plurality of water-cooled storage air-conditioning modules (100) are disconnected, the water-cooled storage air-conditioning modules (100) each supply cooling to a corresponding cooling load; when the cooling components in a plurality of water-cooled storage air-conditioning modules (100) are connected in parallel, a portion of the water-cooled storage air-conditioning modules serve as cooling capacity utilization modules, and another portion of the water-cooled storage air-conditioning modules serve as cooling capacity external supply modules; the disconnected cooling tanks in the cooling capacity external supply modules are connected in parallel with the cooling tanks in the cooling capacity utilization modules, and the cooling capacity is incorporated into the cooling capacity utilization modules.

2. The ice and water storage hybrid energy storage air conditioning system according to claim 1, characterized in that: The ice storage and water storage hybrid energy storage air conditioning system has multiple operating modes, including independent working mode, ice storage transfer mode, and water storage combined mode.

3. The ice and water storage hybrid energy storage air conditioning system according to claim 2, characterized in that: The number of the water-cooled storage air-conditioning modules (100) is two; the water-cooled storage tank parallel switching component (400) includes a twenty-fifth valve (401) and a twenty-sixth valve (402); the tops of the water-cooled storage tanks (140) of the two water-cooled storage air-conditioning modules (100) are connected via the twenty-sixth valve (402); and the bottoms of the water-cooled storage tanks (140) of the two water-cooled storage air-conditioning modules (100) are connected via the twenty-fifth valve (401).

4. The ice and water storage hybrid energy storage air conditioning system according to claim 3, characterized in that: The water-cooled storage air-conditioning module (100) further includes a second valve (102) and a pump-liquid reversing assembly; a first chilled water pump (130), a second valve (102), a water-cooled storage refrigeration host (120), and corresponding cooling loads are sequentially connected to form a first refrigeration circuit; the cooling storage assembly is connected to the first refrigeration circuit via the pump-liquid reversing assembly; the pump-liquid reversing assembly is used to switch the flow direction of the chilled water, so that the cooling storage assembly can directly switch between a cooling storage state and a cooling release state.

5. The ice and water storage hybrid energy storage air conditioning system according to claim 4, characterized in that: The cold storage component further includes a ninth valve (109), a tenth valve (110), an eleventh valve (111), and a twelfth valve (112); the two top collecting ports of the water cold storage tank (140) are respectively provided with a tenth valve (110) and an eleventh valve (111); the two bottom collecting ports of the water cold storage tank (140) are respectively provided with a ninth valve (109) and a twelfth valve (112); the tenth valve (110) and the ninth valve (109) are connected to the pump liquid reversing component; the eleventh valve (111) and the twelfth valve (112) are connected to the supplementary cooling module (200).

6. The ice and water storage hybrid energy storage air conditioning system according to claim 5, characterized in that: The pump liquid reversing assembly comprises a first cold storage pump (150), a third valve (103), a fourth valve (104), a fifth valve (105), a sixth valve (106), a seventh valve (107) and an eighth valve (108); the fifth valve (105) is connected between the top of the cold water storage tank (140) and the input end of the cold water storage refrigeration host (120); the sixth valve (106) is connected between the bottom of the cold water storage tank (140) and the output end of the cold water storage refrigeration host (120); the third valve (103) and the fourth valve (104) are respectively provided in two branches led out of the output end of the first cold storage pump (150), and are respectively connected to the input end and the output end of the cold water storage refrigeration host (120); the seventh valve (107) and the eighth valve (108) are respectively provided in two branches led out of the input end of the first cold storage pump (150), and are respectively connected to the top and the bottom of the cold water storage tank (140).

7. The ice and water storage hybrid energy storage air conditioning system according to claim 6, characterized in that: In the independent working mode, the water storage tank parallel switching component (400) isolates the water storage tanks (140) in the two water storage air conditioning modules (100); the fourteenth valve (201) in the supplementary cooling module (200) is closed, and the supplementary cooling pumps (203), the eleventh valve (111), and the twelfth valve (112) in all supplementary cooling heat exchange units are closed; the ice storage air conditioning module (300) and the two water storage air conditioning modules (100) each supply cooling to the corresponding cooling load; In the ice storage cooling capacity transfer mode, the water storage air conditioning module (100) that needs supplementary cooling is used as the target water storage air conditioning module (100); the connection between the water storage tank (140) in the target water storage air conditioning module (100) and the cooling load is disconnected; the ice storage air conditioning module (300) is opened; the fourteenth valve (201) in the supplementary cooling module (200) is opened, and the supplementary cooling pump (203) in the supplementary cooling heat exchange unit corresponding to the target water storage air conditioning module (100) is opened; the ice storage air conditioning module (300) delivers chilled water to the supplementary cooling heat exchange path; the cooling capacity of the chilled water is exchanged to the supplementary cooling circulation loop when passing through the supplementary cooling heat exchanger (202) corresponding to the target water storage air conditioning module (100), and is stored in the water storage tank (140); In the water-cooled storage combined mode, one of the water-cooled storage air-conditioning modules (100) is used as a cold storage utilization module, and the other water-cooled storage air-conditioning module (100) is used as a cold storage external supply module; in the cold storage external supply module, the fifth valve (105), the sixth valve (106), the seventh valve (107), and the eighth valve (108) are closed; in the cold storage utilization module, the twenty-sixth valve (402) and the twenty-fifth valve (401) are opened.

8. The ice and water storage hybrid energy storage air conditioning system according to claim 1, characterized in that: The ice storage air conditioning module (300) comprises an ice storage refrigeration host (320), an ethylene glycol pump (330), an ice storage tank (340), a host cooling heat exchanger (350), and a second chilled water pump (360); the ethylene glycol pump (330), the ice storage refrigeration host (320), the coil inside the ice storage tank (340), and the first heat exchange channel of the host cooling heat exchanger (350) are sequentially connected to form an ice refrigeration cycle; the second heat exchange channel of the host cooling heat exchanger (350), the second chilled water pump (360), and the corresponding cooling load of the ice storage air conditioning module (300) are sequentially connected to form an ice cooling cycle.

9. The control method of a hybrid energy storage air conditioning system of ice and water storage according to claim 7, characterized in that: According to a preset control cycle, the control method of the water storage air conditioning module (100) and the ice storage air conditioning module (300) is periodically executed respectively; The control method of the water-cooled air conditioning module (100) is as follows: Step 1: Controlling each water-cooled storage air conditioning module (100) to operate in an independent working mode or a water-cooled storage combined mode according to the cooling load adjustment of each cooling load; Step 2: If the next period is off-peak period, enter full cold storage mode or storage and supply mode; If the next period is not a valley period, proceed to step 3; Step 3: If the remaining cooling capacity is sufficient to fully cover all the remaining peak-time cooling loads before the next valley-time period, select to enter the pure cooling mode or the combined cooling mode; if the remaining cooling capacity is insufficient to cover all the remaining peak-time cooling loads before the next valley-time period, proceed to step 4; Step 4: If the remaining cooling capacity combined with the water-storage cooling host (120) is insufficient to cope with the load of the remaining period, the water-storage cooling air-conditioning module (100) is switched to a storage-and-supply mode, and enters an ice-storage cooling capacity transfer mode, whereby the cooling capacity of the ice-storage cooling air-conditioning module (300) is supplemented to the water-storage cooling air-conditioning module (100); if the remaining cooling capacity combined with the water-storage cooling host (120) is sufficient to cope with the load of the remaining period, the combined cooling mode is entered; The control method of the ice storage air conditioning module (300) is as follows: Step 1: If the next period is a valley period, then enter the full cold storage mode or the storage and supply mode, and the ice storage air conditioning module (300) of the current cycle is regulated; if the next period is not a valley period, then execute step 2; Step 2: If the current cooling capacity of all water-cooled storage air-conditioning modules (100) is sufficient to cover all remaining peak-time cooling loads before the next valley-time period, then directly proceed to step 3; if the current cooling capacity of some or all water-cooled storage air-conditioning modules is insufficient to cover all remaining peak-time cooling loads before the next valley-time period, then enter the ice-cooled storage capacity transfer mode, so that the ice-cooled storage air-conditioning module (300) provides cooling for the water-cooled storage air-conditioning module (100); Step 3: If the remaining cooling capacity of the ice storage air conditioning module (300) is insufficient to cover all the remaining peak power period cooling loads before the next valley power period, then the storage and supply mode is selected to replenish the cooling capacity of the ice storage air conditioning module (300); if the remaining cooling capacity is sufficient to completely cover all the remaining peak power period cooling loads before the next valley power period, then the combined cooling mode is selected.

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