Ice storage and water storage mixed energy storage air conditioning system and control method thereof

Abstract

The invention provides an ice storage and water storage mixed energy storage air conditioning system and a control method thereof. The system comprises an ice storage air conditioner module, a cold supplementing module, a plurality of chilled water storage air conditioner modules and a chilled water storage tank parallel switching assembly. The ice storage air conditioner module and the water storage air conditioner modules correspond to different cold loads respectively. The cold supplementing module is used for transferring the cold energy stored by the ice storage air conditioner module to any one or more chilled water storage air conditioner modules. The chilled water storage tank parallel switching assembly is used for switching and distributing the chilled water storage assemblies in the chilled water storage system. The chilled water storage system and the ice storage system are organically combined, the advantage of high energy storage density of ice storage is played, the energy storage volume of the system is greatly reduced, meanwhile, the multiple chilled water storage systems are flexibly configured, the advantages of wide energy storage temperature area and high cold release rate of the chilled water storage systems are played, and the energy storage efficiency of the system is improved. And the system can efficiently respond to the energy consumption scene requirements of changeable cold supply temperature areas, large load fluctuation amplitude and frequent peak-valley electricity price change.

Description

Technical Field

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

[0002] Energy storage air conditioning technology achieves efficient use and conservation of energy by storing cold or heat during low electricity demand periods and releasing it during peak electricity demand periods to reduce electricity demand during peak load 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 personnel 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 in each temperature zone are relatively independent, and the cold storage systems 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 variable loads in multiple temperature zones on the power grid side.

[0006] In a first aspect, the present invention provides an ice storage and water storage hybrid energy storage air conditioning system, which includes an ice storage air conditioning module, a supplementary cooling module and a plurality of water storage air conditioning modules. The ice storage air conditioning module and the plurality of water storage air conditioning modules correspond to different cooling loads, respectively. The water storage air conditioning module includes a water storage refrigeration main unit, a first chilled water pump and a cooling assembly. The cooling assembly includes a water storage tank. The water storage refrigeration main unit and the first chilled water pump are used to generate and transport chilled water supplied to the water storage tank or the cooling load.

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

[0008] Preferably, the ice storage air conditioning module and the plurality of water storage air conditioning modules correspond to cooling loads in different temperature zones. 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 supplementary cooling heat exchange path.

[0009] Preferably, it also includes a water-cooled tank parallel switching component. The cooling components of the plurality of water-cooled air conditioning modules are connected via the water-cooled tank parallel switching component. The water-cooled tank parallel switching component is used to control the cooling components in any plurality of water-cooled air conditioning modules to be connected in parallel by controlling a valve.

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

[0011] In the independent working mode, the water storage tank parallel switching component isolates the water storage tanks in all water storage air conditioning modules. The fourteenth valve in the supplementary cooling module is closed, and the supplementary cooling pumps, the eleventh valve, and the twelfth valve in all supplementary cooling heat exchange units are closed; the ice storage air conditioning module and multiple water storage air conditioning modules each provide cooling for the corresponding cold load.

[0012] In the ice storage cold capacity transfer mode, the water storage air-conditioning module that needs supplementary cooling is used as the target water storage air-conditioning module; the connection between the water storage tank and the cold 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 supplementary cooling module is opened, and the supplementary cooling pump in the supplementary cooling 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 supplementary cooling heat exchange path; the cold capacity of the chilled water is exchanged to the supplementary cooling circulation loop when passing through the supplementary cooling heat exchanger corresponding to the target water storage air-conditioning module, and is stored in the water storage tank.

[0013] In the water-cooled combined mode, a part of the water-cooled air-conditioning modules are used as cold storage utilization modules, and the other part of the water-cooled air-conditioning modules are used as cold storage external supply modules. The water-cooled tank parallel switching component connects the cold storage utilization module in parallel with the water-cooled tank in the cold storage external supply module. In the cold storage external supply module, close the fifth valve, the sixth valve, the seventh valve, and the eighth valve; in the cold storage utilization module, open the twenty-fifth valve and the twenty-sixth valve, so that the water-cooled tank in the cold storage external supply module is cut off, and the cut-off water-cooled tank is connected in parallel with the water-cooled tank in the cold storage utilization module, and its cold storage capacity is incorporated into the cold storage utilization module.

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

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

[0016] Preferably, the cold storage assembly further comprises a ninth valve, a tenth valve, an eleventh valve and a twelfth valve. The two top headers of the water cold storage tank are provided with the tenth valve and the eleventh valve respectively. The two bottom headers of the water cold storage tank are provided with the ninth valve and the twelfth valve respectively. The tenth valve and the ninth valve are connected to the pump liquid reversing assembly; the eleventh valve and the twelfth valve are connected to the supplementary 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 host; the sixth valve is connected between the bottom of the cold water storage tank and the output end of the cold water storage refrigeration host; the third valve and the fourth valve are respectively arranged in the two branches led out of 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 host; the seventh valve and the eighth valve are respectively arranged in the two branches led out of 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 comprises an ice storage refrigeration host, an ethylene glycol pump, an ice storage tank, a host cooling heat exchanger and a second chilled water pump. The ethylene glycol pump, the ice storage refrigeration host, the coil in the ice storage tank, and the first heat exchange channel of the host cooling heat exchanger are sequentially connected to form an ice refrigeration circulation loop. Both ends of the ice storage tank and the host cooling heat exchanger are provided with valve short-circuit lines in parallel. The second heat exchange channel of the host cooling heat exchanger, the second chilled water pump and the corresponding cold load of the ice storage air conditioning module are sequentially connected to form an ice cooling loop.

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

[0020] In a second aspect, the present invention provides a control method for an ice-storage and water-storage hybrid energy storage air conditioning system, 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: Step 1: According to the cooling load adjustment of each cooling load, each water-cooled air conditioning module is controlled to operate in an independent working mode or a water-cooled combined mode.

[0022] Step 2: If the next period is a valley power period, enter the full cold storage condition or the storage and supply condition; if the next period is not a valley power period, execute step 3.

[0023] Step 3: If the remaining cooling capacity is sufficient to completely cover all remaining peak power period cooling loads before the next valley power period, choose to enter the pure cooling condition or the combined cooling condition; if the remaining cooling capacity is insufficient to cover all remaining peak power period cooling loads before the next valley power period, execute step 4.

[0024] Step 4: If the remaining cooling capacity together 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 together with the water-storage cooling host is sufficient to cope with the load of the remaining period, the combined cooling condition is entered.

[0025] The control method of the ice storage air conditioning module is as follows: Step 1: If the next period is a valley power period, the full cold storage condition or the storage and supply condition is entered, and the ice storage air conditioning module regulation of the current cycle is completed; if the next period is not a valley power period, execute step 2.

[0026] Step 2: If the current cooling capacity of all water-storage cooling air-conditioning modules is sufficient to cover all remaining peak power period cooling loads before the next valley power period, proceed directly to step 3; if the current cooling capacity of some or all water-storage cooling air-conditioning modules is insufficient to cover all remaining peak power period cooling loads before the next valley power period, enter the ice storage cooling capacity transfer mode, so that the ice storage cooling air-conditioning module supplements the cooling for the water storage cooling air-conditioning module.

[0027] Step 3: If the remaining cooling capacity of the ice storage air-conditioning module is not enough to cover all the remaining peak power period cooling loads before the next valley power period, enter the storage and supply mode to supplement the cooling capacity of the ice storage air-conditioning module; if the remaining cooling capacity is sufficient to completely cover all the remaining peak power period cooling loads before the next valley power period, enter the combined cooling mode.

[0028] The present invention has the following beneficial effects: 1. The cold storage capacity in different air-conditioning modules in the present invention is dynamically adjustable and can be quickly transferred: Compared with the conventional independent cooling system, the present invention can quickly supplement the cold in the ice storage tank to the water storage tank of the water storage air-conditioning module through the cold replenishment module, so that the energy storage capacity in the air-conditioning modules in different temperature zones is dynamically adjustable and integrated with each other; thereby making the energy storage equipment more compact and more efficient, effectively reducing the system capacity and investment, and realizing rapid response to loads in multiple temperature zones, effectively ensuring energy supply safety.

[0029] 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 changes in periodic loads due to seasonal changes, production line adjustments, etc., 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, which not only expands the energy storage capacity of the cooling system in this temperature zone, but also can realize continuous transfer of cold in ice storage by having one tank accept cold supplemented by the ice-cooled air-conditioning module and another tank release cold, thereby greatly improving the load response capability of this temperature zone.

[0030] 3. The present invention can flexibly respond to the dispatching requirements of the power grid side and the load requirements of the user side: In the present invention, through energy storage evaluation and mode switching, it is ensured that the cold storage capacity in each temperature zone is sufficient to cover the cold load of the remaining period, effectively respond to the diversified and complex cold demand of each temperature zone, ensure the energy supply safety of the system, and at the same time, can efficiently respond to the power control input conditions on the power grid side. In addition, the present invention can combine factors such as peak and valley electricity prices and load forecasts to perform combined analysis and calculation simulation of various operating modes for the remaining time periods of the entire cooling system, so as to greatly improve the economic efficiency of system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0032] Figure 2 It is a structural schematic diagram of the water-cooled air conditioning module in the present invention.

[0033] Figure 3 It is a structural schematic diagram of the ice storage air conditioning module in the present invention.

[0034] Figure 4 This is a control flow chart of the water-cooled air conditioning module in the present invention.

[0035] Figure 5 This is a control flow chart of the ice storage air conditioning module in the present invention. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] like Figure 1 As shown, an ice storage and water storage hybrid energy storage air conditioning system includes two water storage air conditioning modules 100, a supplementary cooling module 200, an ice storage air conditioning module 300 and a water storage tank parallel switching component 400. The ice storage and water storage hybrid energy storage air conditioning system can provide three different cooling temperature zones; the cooling temperatures of the three cooling temperature zones decrease in sequence, corresponding to the ice storage air conditioning module 300 and the two water storage air conditioning modules 100 respectively. The three different cooling temperature zones correspond to three cooling loads respectively.

[0038] 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 volume of the ice storage tank is about 260m 3 , single volume of water storage tank 500m 3 The total volume of the cold storage module is 1260m 3 Conventional ice and water storage independent solutions, 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%.

[0039] like Figure 1 and Figure 2As shown, the water-cooled air conditioning module 100 includes a water-cooled refrigeration host 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.

[0040] The first chilled water pump 130, the second valve 102, the water storage refrigeration host 120, the thirteenth valve 113, and the corresponding cold load are sequentially connected to form a first refrigeration circuit. The cold storage component is connected to the first refrigeration circuit through a pump liquid reversing component to form a cold storage and release circuit with switchable flow direction.

[0041] The cold storage component includes a water cold storage tank 140, a ninth valve 109, a tenth valve 110, an eleventh valve 111 and a twelfth valve 112. The ninth valve 109, the tenth valve 110, the eleventh valve 111 and the twelfth valve 112 are electric regulating valves. The top water distributor of the water cold storage tank 140 is provided with two top collecting ports; the two top collecting ports are respectively provided with the tenth valve 110 and the eleventh valve 111, which serve as two hot water inlet and outlet interfaces of the cold storage component. The bottom water distributor of the water cold storage tank 140 is provided with two bottom collecting ports. The two bottom collecting ports are respectively provided with the ninth valve 109 and the twelfth valve 112, which serve as two cold water inlet and outlet interfaces of the cold storage component.

[0042] 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 electric regulating valves.

[0043] 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.

[0044] The two branches led 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 led 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.

[0045] The specific connection relationship of each component in the water-cooled air conditioning module 100 is further described as follows: the input end of the water-cooled refrigeration host 120 is connected to one end of the second valve 102, the third valve 103, and the fifth valve 105; the output end of the water-cooled refrigeration host 120 is connected to one end of the thirteenth valve 113. The other end of the second valve 102 is connected to the output end of the first chilled water pump 130. The input end of the first chilled water pump 130 is connected to the first valve 101 and the output end of the corresponding cold load. The other end of the thirteenth valve 113 is connected to the input end of the cold load, the other end of the first valve 101, the fourth valve 104, and one end of the sixth valve 106. The other ends of the third valve 103 and the fourth valve 104 are both connected to the output end of the first cold storage pump 150. The input end of the first cold storage 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 water cold 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 water cold storage tank 140 is connected to the other end of the valve 119 and one end of the twelfth valve 112.

[0046] like Figure 1 As shown, the cold storage components of the two water-cooled air conditioning modules 100 are arranged in parallel, and are switched on and off by the water-cooled tank parallel switching component 400; the water-cooled tank parallel switching component 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 air conditioning modules 100 are connected by the twenty-sixth valve 402; the cold water inlet and outlet interfaces of the cold storage components of the two water-cooled air conditioning modules 100 are connected by the twenty-fifth valve 401; the twenty-fifth valve 401 is an electric switch valve; the twenty-sixth valve 402 is an electric regulating valve.

[0047] like Figure 1 and Figure 3 As shown, the ice storage air conditioning module 300 includes a refrigeration host 320, a glycol pump 330, an ice storage tank 340, a host 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 electric switch 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 electric regulating valves.

[0048] The input end of the glycol pump 330 is connected to the input end of the ice storage refrigeration host 320 and one end of the sixteenth valve 302; the output end of the ice storage refrigeration host 320 is connected to one end of the fifteenth valve 301; the other ends of the fifteenth valve 301 and the sixteenth valve 302 are connected to one end of the twentieth valve 306 and the coil input end of the ice storage tank 340. The coil output end of the ice storage tank 340 is connected to one end of the nineteenth valve 305. The other ends of the nineteenth valve 305 and the twentieth valve 306 are connected to one end of the seventeenth valve 303 and the eighteenth valve 304. The other end of the eighteenth valve 304 is connected to one end of the first heat exchange pipe in the host cooling heat exchanger 350. The other end of the first heat exchange pipe in the host cooling heat exchanger 350 and the other end of the seventeenth valve 303 are both connected to the input end of the glycol pump 330.

[0049] 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.

[0050] 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 cold storage 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 cold 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 channel of the supplementary cooling heat exchanger 202 in the two supplementary cooling heat exchange units are sequentially connected to form a supplementary cooling heat exchange passage; the two ends of the supplementary cooling heat exchange passage 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 host cold supply heat exchanger 350.

[0051] The cold storage capacity stored in the ice storage tank 340 can be exchanged to the cold storage components of the two water-cold storage air-conditioning modules 100 through the supplementary cooling module 200, so as to improve the ability of the two water-cold storage 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-cold storage air-conditioning modules 100 in succession; therefore, the cold temperature obtained by heat exchange in the first water-cold storage air-conditioning module 100 is lower than the cold temperature obtained by heat exchange in the second water-cold storage air-conditioning module 100; thereby, the supplementary cooling temperature can be made to meet the temperature zones corresponding to the two water-cold storage air-conditioning modules 100.

[0052] 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.

[0053] The ice storage and water storage hybrid energy storage air conditioning system provided in this embodiment has multiple operation modes, including an independent working mode, an ice storage capacity transfer mode, and a water storage combined mode.

[0054] Independent working mode: In this mode, one ice storage air conditioning module 300 and two water storage air conditioning modules 100 each provide cooling for the corresponding cold load without affecting each other. The 26th valve 402 and the 25th valve 401 in the water storage tank parallel switching component 400 are closed; the 14th valve 201 in the supplementary cooling module 200 is closed, and the supplementary cooling pump 203, the 11th valve 111, and the 12th valve 112 in the two supplementary cooling heat exchange units are all closed; the valves inside 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 cold load.

[0055] Ice storage capacity transfer mode: In this mode, the ice storage air conditioning module 300 with a larger cold storage capacity is used to supplement the cold storage capacity of the water storage air conditioning module 100 with a smaller cold storage capacity. When the system detects that the intermediate cold storage capacity in one of the water storage air conditioning modules 100 is insufficient (the insufficient cold storage capacity specifically means that the cold storage capacity of the water storage tank 140 cannot cope with the load of the next hour or the remaining cold storage capacity of the water storage tank reaches the preset cold storage warning critical value), the water storage refrigeration host 120 has limited cold storage output under the premise of ensuring cold supply, and the cold storage capacity in the ice storage air conditioning module 300 can be used to quickly charge the water storage air conditioning module 100.

[0056] The specific control method of the ice storage cold capacity transfer mode is as follows: the water storage cold air conditioning module 100 that needs supplementary cooling is used as the target water storage cold air conditioning module 100; first, the tenth valve 110 and the ninth valve 109 in the target water storage cold air conditioning module 100 are closed, so that the water storage tank 140 of the water storage cold air conditioning module 100 stops releasing cold; the ice storage cold refrigeration host 320, the ethylene glycol pump 330 and the second chilled water pump 360 in the ice storage cold 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 of the target water storage cold air conditioning module 100 and the supplementary cooling pump 203 in the corresponding supplementary cooling heat exchange unit are opened, so that the corresponding supplementary cooling circulation loop of the target water storage cold air conditioning module 100 is turned on and starts circulating; by controlling the opening degree of the fourteenth valve 201 and the frequency of the supplementary cooling pump 203, the cold capacity in the ice storage tank 340 is accurately controlled and accurately transferred to the water storage cold 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 turned off 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 tank 140 in the target water-cooled air-conditioning module 100 can be released.

[0057] In the cold capacity transfer mode, two water-cooled air-conditioning modules 100 can be supplied with cold air at the same time, and the chilled water pumped by the second chilled water pump 360 passes through two cold supply heat exchange units with cooling temperature zones from low to high in sequence; precise cold supply is achieved 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 cold supply pumps 203 in the two cold supply heat exchange units.

[0058] 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 valley power period to replenish the cold capacity in the ice storage tank.

[0059] Water storage combined mode: In this mode, the water cold storage tanks 140 in the two water cold storage air conditioning modules 100 are connected in parallel, and the two water cold storage air conditioning modules 100 serve as a cold storage usage module and a cold storage external supply module respectively. The cold storage capacity stored in the water cold storage tank 140 in the cold storage external supply module is supplemented to the cold storage usage module. The use scenario of the water cold storage joint mode is: when the load is subject to seasonal changes, temporary adjustments to the production line, etc., and there are phased and large adjustments, the system can be flexibly converted.

[0060] The specific control method of the water storage and cooling combined mode is as follows: 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.

[0061] In the cold storage capacity utilization module, the twenty-sixth valve 402 and the twenty-fifth valve 401 are opened.

[0062] The water-cooled storage joint mode is equivalent to merging the water-cooled storage tank 140 in the cold storage external supply module 100 into the water-cooled storage tank 140 in the cold storage utilization module 100, thereby expanding the energy storage volume. At the same time, the two water-cooled storage tanks can be switched through valves to realize the function of releasing cold from one water-cooled storage tank while replenishing cold from the other water-cooled storage tank, and continuously input the cold in the ice storage tank into the cold storage utilization module 100, thereby meeting the large amount of cold demand of the cold load corresponding to the cold storage utilization module.

[0063] Both the ice storage air conditioning module 300 and the water storage air conditioning module 100 have multiple working conditions, including full storage condition, pure release condition, combined cooling condition and storage and supply condition; the full storage condition means that the cold output by the refrigeration host is output to the cold storage component or the ice storage tank 340 for storage; the pure release condition means that the refrigeration host does not work and only uses the cold in the cold storage component or the ice storage tank 340 to supply cold to the user. The combined cooling condition means that the refrigeration host and the cold storage component or the ice storage tank 340 that stores cold jointly supply cold to the user. The storage and supply condition means that the refrigeration host stores cold for the cold storage component while supplying cold to the user.

[0064] In the water-cooled storage combined mode, the cold storage external supply module stops working except for the cold storage component; 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.

[0065] 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.

[0066] The valve control of the water-cooled 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.

[0067] The valve control of the ice storage air conditioning module 300 in the operation state of storing and supplying is as follows: close the 18th valve 304 and the 20th valve 306; open the 17th valve 303 and the 19th valve 305, and the ice storage refrigeration host 320 enters the ice making state; at the same time, open the 24th valve 310, close the 21st valve 307, turn on the pump 34, and meet the cold demand of the cold load corresponding to the ice storage air conditioning module 300 by adjusting the frequency of the pump 34 and the opening of the 23rd valve 309. The low-temperature ethylene glycol output by the ice storage refrigeration host 320 replenishes the cold capacity in the ice storage tank 340 while ensuring cold supply.

[0068] 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 switching of the system and accurate response to the load.

[0069] In this embodiment, 15 minutes is used as a control cycle, and the control methods of the water-storage air-conditioning module 100 and the ice-storage air-conditioning module 300 are cyclically executed respectively.

[0070] like Figure 4 As shown, the control method of the water-cooled air conditioning module 100 is as follows: Step 1. For the water-cooled air-conditioning module 100, first confirm whether the system's cooling load has been significantly adjusted. This item is set to no adjustment by default. When there are seasonal changes, temporary adjustments to the production line, etc., and the phased cooling load is adjusted significantly, 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.

[0071] Step 2: After the cold storage capacity is allocated, determine whether the next period is a valley period. If the next period is a valley period, select to enter the storage and supply mode or the full cold storage mode according to whether there is a cold load in the valley period, and the water storage air conditioning module 100 of the current cycle is controlled. If the next period is not a valley period, execute step 3.

[0072] Step 3: Evaluate the cold storage capacity. If the remaining cold storage capacity is sufficient to completely cover all the remaining peak power period cooling loads before the next valley power period, then the pure cooling release condition (peak power period selection) or the combined cooling condition (normal power period selection) is selected according to whether the current peak power period is in progress, and the water storage air conditioning module 100 control of the current cycle is completed. If the remaining cold storage capacity cannot completely cover all the remaining peak power period cooling loads before the next valley power period, then execute step 4.

[0073] Step 4: Determine whether the remaining cooling capacity together with the host is sufficient to cope with the remaining period load. If the remaining cooling capacity together with the host is insufficient to cope with the remaining period load, the entire ice storage and water storage hybrid energy storage air conditioning system enters the ice storage cooling capacity transfer mode, and the water storage air conditioning module 100 switches to the storage and supply mode to achieve the fastest cooling and ensure energy supply safety. The water storage air conditioning module 100 of the current cycle is controlled.

[0074] If the remaining cooling capacity together with the host is sufficient to cope with the cooling load during the remaining period (i.e., under the premise of ensuring energy supply safety), proceed to step five.

[0075] Step 5: Determine whether the power control input condition on the grid side is received. If the control input condition is received, a quick response is performed. When the control input condition is a power consumption encouragement instruction, 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 cooling mainly by using the water storage cooling host 120 for cooling); when 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 switching to a storage and supply condition with the water storage cooling host 120 fully open).

[0076] If the control input conditions are not 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 most economical operating mode is selected.

[0077] like Figure 5 As shown, the control method of the ice storage air conditioning module 300 is as follows: Step 1: Determine whether the next period is a valley period; if the next period is a valley period, select to enter the storage and supply mode or the full cold storage mode according to whether there is a valley period cold load. If the next period is not a valley period, execute step 2.

[0078] Step 2: Evaluate the cold storage capacity of each water-cooled air-conditioning module 100. If the current cold storage 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 cold storage capacity of some or all water-cooled air-conditioning modules is insufficient to cope with the load of the remaining period, enter the ice cold storage capacity transfer mode, so that the ice cold storage air-conditioning module 300 provides cooling for the water-cooled air-conditioning module 100, and then proceed to step 3.

[0079] Step 3: Evaluate the cold storage capacity of the ice storage air conditioning module 300. If the remaining cold capacity is sufficient to completely cover all the remaining peak power period cold loads before the next valley power period, select to enter the pure cold release condition (peak power period selection) or the combined cooling condition (normal power period selection) according to whether the current peak power period is in progress. If the remaining cold capacity cannot completely cover all the remaining peak power period cold loads before the next valley power period, proceed to step 4.

[0080] Step 4: Determine whether the remaining cooling capacity together with the host is sufficient to cope with the remaining loads during all periods. If the remaining cooling capacity together with the host is insufficient to cope with the remaining loads during all periods, switch to the storage and supply mode to supplement the cooling capacity of the ice storage air conditioning module 300 to ensure energy supply safety. If the remaining cooling capacity is sufficient to completely cover the remaining peak power period cooling load (i.e., energy supply safety can be guaranteed), execute step 5.

[0081] Step 5, determine whether the power control input condition on the grid side is received. If the control input condition is received, respond quickly. When 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 refrigeration host 120 fully open); when 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 cooling mainly by melting ice and releasing cold in the water storage tank 140).

[0082] If the control input conditions are not 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 most economical operating mode is selected.

[0083] Combined with the above description, it can be seen that this embodiment organically combines the water storage system and the ice storage system for application scenarios with diversified and complex cooling temperature zone requirements, which not only takes advantage of the high energy storage density of ice storage and greatly reduces the energy storage volume of the entire system, but also takes advantage of the wide energy storage temperature zone and fast response of the water storage system, so that the system can respond to multiple temperature zones and variable loads in a timely manner. The cooling systems in each temperature zone can operate independently without affecting each other, and can also be efficiently coupled to achieve rapid switching and transfer of cold storage. In addition, in this embodiment, the air-conditioning modules corresponding to the three different temperature zones are efficiently coupled, and the three air-conditioning modules can realize simultaneous storage and supply. The ice storage module and the water storage module can also perform energy storage conversion and efficient cold supplement. The flexibility and continuity of energy storage and cold release have been significantly improved. Therefore, compared with the traditional independent ice and water storage systems, it provides a richer and more flexible combination of operation modes and a faster and more effective optimization control method.

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: It also includes a supplementary cooling module (200) and a plurality of water-cooled air conditioning modules (100); the ice-cooled air conditioning module (300) and the plurality of water-cooled air conditioning modules (100) correspond to different cooling loads respectively; the water-cooled air conditioning module (100) includes a water-cooled refrigeration main unit (120), a first chilled water pump (130) and a cooling assembly; the cooling assembly includes a water-cooled storage tank (140); the water-cooled refrigeration main unit (120) and the first chilled water pump (130) are used to generate and transport chilled water supplied to the water-cooled 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) comprises 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 comprise 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 channel of the supplementary cooling heat exchanger (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).

2. The ice storage and water storage hybrid energy storage air conditioning system according to claim 1, characterized in that: 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 respectively; the temperature zone corresponding to the ice storage air conditioning module (300) is the lowest; and 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.

3. The ice storage and water storage hybrid energy storage air conditioning system according to claim 1, characterized in that: It also includes a water cold storage tank parallel switching component (400); the water cold storage tank parallel switching component (400) is used to control the parallel connection or disconnection of cold storage components in any plurality of water cold storage air conditioning modules (100) through valves.

4. The ice-water-storage hybrid energy storage air conditioning system according to claim 3, 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; In the independent working mode, the water storage tank parallel switching component (400) isolates the water storage tanks (140) in all the 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 the supplementary cooling heat exchange units are closed; the ice storage air conditioning module (300) and the plurality of water storage air conditioning modules (100) each provide cooling for the corresponding cold load; In the ice storage cold 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 cold 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) transports chilled water to the supplementary cooling heat exchange path; the cold 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-cooling combined mode, a portion of the water-cooling air conditioning modules (100) are used as cooling capacity utilization modules, and another portion of the water-cooling air conditioning modules (100) are used as cooling capacity external supply modules; in the cooling capacity external supply module, the fifth valve (105), the sixth valve (106), the seventh valve (107), and the eighth valve (108) are closed; and in the cooling capacity utilization module, the twenty-sixth valve (402) and the twenty-fifth valve (401) are opened.

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

6. The ice-water-storage hybrid energy storage air conditioning system according to claim 1, characterized in that: The water-cooled air conditioning module (100) further comprises a second valve (102) and a pump-liquid reversing assembly; a first chilled water pump (130), a second valve (102), a water-cooled refrigeration main unit (120), and a corresponding cold load are sequentially connected to form a first refrigeration circuit; the cold 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 chilled water, so that the cold storage assembly can directly switch between a cold storage state and a cold release state.

7. The ice-water-storage hybrid energy storage air conditioning system according to claim 6, characterized in that: The cold storage component further comprises 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 the tenth valve (110) and the eleventh valve (111); the two bottom collecting ports of the water cold storage tank (140) are respectively provided with the ninth valve (109) and the twelfth valve (112); the tenth valve (110) and the ninth valve (109) are connected to the pump liquid reversing component; and the eleventh valve (111) and the twelfth valve (112) are connected to the supplementary cooling module (200).

8. The ice-water-storage hybrid energy storage air conditioning system according to claim 6, 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 main unit (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 main unit (120); the third valve (103) and the fourth valve (104) are respectively provided in two branches led out from 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 main unit (120); the seventh valve (107) and the eighth valve (108) are respectively provided in two branches led out from 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).

9. The ice-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 circulation loop; the second heat exchange channel of the host cooling heat exchanger (350), the second chilled water pump (360), and the cold load corresponding to the ice storage air conditioning module (300) are sequentially connected to form an ice cooling circuit.

10. The control method of a hybrid energy storage air conditioning system of ice storage and water storage as claimed in claim 4, characterized in that: According to a preset control cycle, a control method for periodically executing the water-storage cooling air conditioning module (100) and the ice-storage cooling air conditioning module (300) respectively; The control method of the water-cooled air conditioning module (100) is as follows: Step 1: Controlling each water-cooled air conditioning module (100) to operate in an independent working mode or a water-cooled combined working mode according to the cooling load adjustment status of each cooling load; Step 2: If the next period is a valley power period, enter the full cold storage mode or the 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 completely cover all the remaining peak power period cooling loads before the next valley power period, select to enter the pure cooling condition or the combined cooling condition; if the remaining cooling capacity is insufficient to cover all the remaining peak power period cooling loads before the next valley power period, execute step 4; Step 4: If the remaining cooling capacity together 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, and 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 together with the water-storage cooling host (120) is sufficient to cope with the load of the remaining period, the combined cooling supply 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 condition or the storage and supply condition, 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 air conditioning modules (100) is sufficient to cover all remaining peak power period cooling loads before the next valley power period, then directly proceed to step 3; if the current cooling capacity of some or all water-cooled air conditioning modules is insufficient to cover all remaining peak power period cooling loads before the next valley power period, then enter the ice cooling capacity transfer mode, so that the ice cooling air conditioning module (300) supplements the cooling of the water-cooled air conditioning module (100); Step 3: If the remaining cooling capacity of the ice storage air conditioning module (300) is insufficient to cover all remaining peak power period cooling loads before the next valley power period, then select to enter the storage and supply mode to replenish the cooling capacity of the ice storage air conditioning module (300); if the remaining cooling capacity is sufficient to completely cover all remaining peak power period cooling loads before the next valley power period, then enter the combined cooling mode.

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