Cold storage device, cold supply device, air conditioning system, control method and control device

Abstract

The invention relates to a cold storage device, a cold supply device, an air conditioning system, a control method and a control device. The cold storage device comprises a first cold storage loop, a second cold storage loop, a first plate heat exchanger and a second double-working-condition refrigerating main machine, wherein the first cold storage loop is formed by a first cold storage pump, a first plate heat exchanger and a first double-working-condition refrigerating main machine; the second cold storage loop is formed by a second cold storage pump, a second plate heat exchanger and a second dual-working-condition refrigeration main machine which are connected in sequence; the first plate heat exchanger and the second plate heat exchanger are connected with the cold storage water pool. According to the embodiment, the lift of the water pump can be matched with the resistance, system energy consumption is reduced, and the energy efficiency ratio of the whole energy supply system is increased; the water pumps can directly provide lift and flow as required, uniform system flow transmission and distribution are achieved, flow attenuation generated by parallel connection of the water pumps is reduced, meanwhile, system resistance is reduced, and system energy efficiency is improved. The resistance balance of the system during cold storage and cold supply of the main machine is met, the flow transmission and distribution of the system are uniform, an electric control valve does not need to be additionally arranged, the system control is simplified, and the system stability is improved.

Description

Technical Field

[0001] The present application relates to the field of air-conditioning technology, and in particular to a cold storage device, a cold supply device, an air-conditioning system, a control method and a control device. Background Art

[0002] At present, most water-storage cooling distribution systems have adopted a more traditional distribution mode, using water pumps in parallel, and realizing pump and valve linkage control through regulating valves + heat meters / flow meters, temperature sensors, pressure sensors, etc. to balance the system flow distribution. The control scheme is complex, the maintenance is difficult, the electric switch / regulating valve is easily damaged, and the initial investment cost and maintenance cost are high.

[0003] High-efficiency water-cooled storage systems generally use a combination of large and small units to meet the storage and cooling needs of each load segment of the system. However, the pressure drops of evaporators and plate heat exchangers of different models will be different, resulting in uneven flow distribution. If the traditional distribution system is still used, the parallel design of the water pump is responsible for the circulation of the water flow in the entire cold storage system, and the head of the cold storage water pump must be designed according to the most unfavorable working conditions, resulting in increased power of some water pumps, increased energy consumption, energy waste, and reduced energy efficiency of the entire energy supply system. Summary of the invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a cold storage device, a cold supply device, an air-conditioning system, a control method and a control device.

[0005] In a first aspect, the present application provides a cold storage device, comprising: a first cold storage circuit and a second cold storage circuit;

[0006] The first cold storage circuit includes: a first cold storage pump, a first plate heat exchanger and a first dual-mode refrigeration host connected in sequence;

[0007] The second cold storage circuit includes: a second cold storage pump, a second plate heat exchanger and a second dual-mode refrigeration host;

[0008] The first plate heat exchanger and the second plate heat exchanger are respectively connected to a cold water storage tank.

[0009] Optionally, it further comprises: a first check valve and a second check valve;

[0010] The first check valve is disposed between the first cold storage pump and the first plate heat exchanger in the first cold storage circuit, and the second check valve is disposed between the second cold storage pump and the second plate heat exchanger in the second cold storage circuit.

[0011] In a second aspect, the present application provides a cooling device, comprising: a first cooling circuit and a second cooling circuit;

[0012] The first cooling circuit comprises: a first cooling pump, the first dual-mode refrigeration host and a first cooling parallel pump group connected in sequence;

[0013] The second cooling circuit comprises: a second cooling pump, the second dual-mode refrigeration host and the first cooling parallel pump group connected in sequence;

[0014] The first cooling supply pump, the second cooling supply pump and the first cooling supply parallel pump group are respectively connected to a target load.

[0015] Optionally, it further comprises: a third check valve and a fourth check valve;

[0016] The third check valve is arranged between the first cooling pump and the first dual-mode refrigeration host in the first cooling circuit, and the fourth check valve is arranged between the second cooling pump and the second dual-mode refrigeration host in the second cooling circuit.

[0017] In a third aspect, the present application provides an air-conditioning system, comprising: a cold storage device as described in any one of the first aspects and a cooling device as described in any one of the third aspects.

[0018] In a fourth aspect, the present application provides a method for controlling the cold storage device as described in the first aspect or the air conditioning system as described in the second aspect, comprising:

[0019] Obtaining a first system load of the air conditioning system in a cold storage mode;

[0020] When the first system load is less than or equal to a first cold storage threshold, the first dual-mode refrigeration host and the first cold storage pump are controlled to be turned on, and the operating frequency of the first cold storage pump is determined according to the cooling capacity of the first dual-mode refrigeration host;

[0021] When the first system load is greater than the first cold storage threshold and the first system load is less than or equal to the second cold storage threshold, the second dual-mode refrigeration host and the second cold storage pump are controlled to be turned on, and the operating frequency of the second cold storage pump is determined according to the cooling capacity of the second dual-mode refrigeration host;

[0022] When the first system load is greater than the second cold storage threshold, the first dual-condition refrigeration host, the first cold storage pump, the second dual-condition refrigeration host and the second cold storage pump are controlled to turn on, the operating frequency of the first cold storage pump is determined according to the cooling capacity of the first dual-condition refrigeration host, and the operating frequency of the second cold storage pump is determined according to the cooling capacity of the second dual-condition refrigeration host.

[0023] In a fifth aspect, the present application provides a method for controlling the cooling device according to the second aspect or the air conditioning system according to the third aspect, comprising:

[0024] Obtaining a second system load of the air-conditioning system in a cooling mode;

[0025] When the load of the second system is less than or equal to the first cooling threshold, the first dual-mode refrigeration host, the first cooling pump and the first cooling parallel pump group are controlled to be turned on, and the operating frequency of the first cooling pump and the first cooling parallel pump group is determined according to the cooling capacity of the first dual-mode refrigeration host;

[0026] When the second system load is greater than the first cooling threshold and the system load is less than or equal to the second cooling threshold, the second dual-mode refrigeration host, the second cooling pump and the first cooling parallel pump group are controlled to be turned on, and the operating frequency of the second cooling pump and the first cooling parallel pump group is determined according to the cooling capacity of the second dual-mode refrigeration host;

[0027] When the second system load is greater than the second cooling threshold, the first dual-condition refrigeration host, the second dual-condition refrigeration host, the first cooling pump, the second cooling pump and the first cooling parallel pump group are controlled to turn on, and the operating frequencies of the first cooling pump, the second cooling pump and the first cooling parallel pump group are determined according to the cooling capacity of the first dual-condition refrigeration host and the second dual-condition refrigeration host.

[0028] In a sixth aspect, the present application provides a control device for the cold storage device as described in the first aspect or for the air conditioning system as described in the third aspect, comprising:

[0029] A first acquisition module, used to acquire a first system load of the air-conditioning system in a cold storage mode;

[0030] a first control module, configured to control the first dual-mode refrigeration host and the first cold storage pump to start when the first system load is less than or equal to a first cold storage threshold, wherein the operating frequency of the first cold storage pump is determined according to the cooling capacity of the first dual-mode refrigeration host;

[0031] a second control module, configured to control the second dual-mode refrigeration host and the second cold storage pump to start when the first system load is greater than the first cold storage threshold and the first system load is less than or equal to the second cold storage threshold, wherein the operating frequency of the second cold storage pump is determined according to the cooling capacity of the second dual-mode refrigeration host;

[0032] The third control module is used to control the first dual-condition refrigeration host, the first cold storage pump, the second dual-condition refrigeration host and the second cold storage pump to start when the first system load is greater than the second cold storage threshold, the operating frequency of the first cold storage pump is determined according to the cooling capacity of the first dual-condition refrigeration host, and the operating frequency of the second cold storage pump is determined according to the cooling capacity of the second dual-condition refrigeration host.

[0033] In a seventh aspect, the present application provides a control device for the cooling device according to the second aspect or for the air conditioning system according to the third aspect, comprising:

[0034] A second acquisition module, used to acquire a second system load of the air-conditioning system in a cooling mode;

[0035] a fourth control module, configured to control the first dual-mode refrigeration host, the first cooling pump, and the first cooling parallel pump group to start when the load of the second system is less than or equal to the first cooling threshold, wherein the operating frequency of the first cooling pump and the first cooling parallel pump group is determined according to the cooling capacity of the first dual-mode refrigeration host;

[0036] a fifth control module, configured to control the second dual-mode refrigeration host, the second cooling pump, and the first cooling parallel pump group to start when the second system load is greater than the first cooling threshold and the system load is less than or equal to the second cooling threshold, wherein the operating frequency of the second cooling pump and the first cooling parallel pump group is determined according to the cooling capacity of the second dual-mode refrigeration host;

[0037] The sixth control module is used for controlling the first dual-condition refrigeration host, the second dual-condition refrigeration host, the first cooling pump, the second cooling pump and the first cooling parallel pump group to start when the second system load is greater than the second cooling threshold, and the operating frequency of the first cooling pump, the second cooling pump and the first cooling parallel pump group is determined according to the cooling capacity of the first dual-condition refrigeration host and the second dual-condition refrigeration host.

[0038] In an eighth aspect, the present application provides an electronic device, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus;

[0039] Memory, used to store computer programs;

[0040] The processor is used to implement the control method described in the fourth aspect or the control method described in the fifth aspect when executing the program stored in the memory.

[0041] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0042] The embodiment of the present application uses a completely independent first cold storage circuit and a second cold storage circuit. On the one hand, the water pump head and resistance can be matched to avoid the situation where the power of some water pumps increases, reduce system energy consumption, avoid energy waste, and improve the energy efficiency ratio of the entire energy supply system; on the other hand, through the direct connection of the pump, the water pump can directly provide head and flow on demand, achieve uniform system flow distribution, reduce flow attenuation caused by parallel connection of water pumps, and at the same time reduce system resistance and improve system energy efficiency; moreover, there is no need to separately provide electric regulating valves and heat meters / flow meters to meet the system resistance balance during host cold storage and cooling, reduce the use of system temperature and pressure sensors, and simplify system control while achieving uniform system flow distribution, improve system stability, and reduce the initial investment cost of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0045] Figure 1 A structural diagram of a traditional water cooling system provided in an embodiment of the present application;

[0046] Figure 2 A structural diagram of an air conditioning system provided in an embodiment of the present application;

[0047] Figure 3 A flow chart of a control method provided in an embodiment of the present application;

[0048] Figure 4 A flowchart of another control method provided in an embodiment of the present application;

[0049] Figure 5 A structural diagram of a control device provided in an embodiment of the present application;

[0050] Figure 6 A structural diagram of another control device provided in an embodiment of the present application;

[0051] Figure 7 A structural diagram of an electronic device provided in an embodiment of the present application.

[0052] Description of the drawings: 1. The first plate heat exchanger, 2. The second plate heat exchanger, 3. The cold storage parallel pump group, 4. Electric regulating valve No. Ⅰ, 5. Electric regulating valve No. Ⅱ, 6. The second cold supply parallel pump group, 7. Regulating valve No. Ⅲ, 8. Regulating valve No. Ⅳ, 9. The first dual-condition refrigeration main unit, 10. The second dual-condition refrigeration main unit, 11. The first cold supply pump, 12. The second cold supply pump, 13. The first cold storage pump, 14. The second cold storage pump, 15. The first cold supply parallel pump group, 16. Electric switching valve No. Ⅰ. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0054] like Figure 1 As shown, in the traditional water-cooled storage system, the water flow circulation of the small unit is: No. Ⅰ electric regulating valve 4→the first plate heat exchanger 1→the cold storage parallel pump group 3→No. Ⅲ regulating valve 7→the first dual-mode refrigeration host 9→No. Ⅰ electric regulating valve 4, and the water flow circulation of the large unit is: No. Ⅱ electric regulating valve 5→the second plate heat exchanger 2→the cold storage parallel pump group 3→No. Ⅳ regulating valve 8→the second dual-mode refrigeration host 10→No. Ⅱ electric regulating valve 5. Since the return water section of the water flow circulation of the large and small units shares the pipeline where the cold storage parallel pump group 3 is located, the water supply section also has a shared pipeline, and since the high-efficiency water-cooled storage system generally adopts the form of matching large and small units to meet the storage and release needs of each load section of the system The requirements are that the pressure drops of evaporators and plate heat exchangers of different models will be different, resulting in uneven flow distribution in the water circulation pipelines of large and small units. The flow distribution in the water circulation pipeline with large resistance will be small, and the flow distribution in the water circulation pipeline with small resistance will be large. It is necessary to adjust through the No. Ⅱ electric regulating valve 5, No. Ⅲ regulating valve 7, and No. Ⅳ regulating valve 8, and the No. Ⅰ electric switch valve 16 must be closed. The large number of regulating valves will increase the control difficulty of the group control system and greatly increase the cost. Moreover, the traditional water storage cooling system must be equipped with regulating valves + heat meters / flow meters, temperature sensors, pressure sensors, etc. to realize pump and valve linkage control to balance the system flow distribution, which will also increase the cost.

[0055] In addition, assume that the pressure drop of the first plate heat exchanger 1 is a kPa, the pressure drop of the second plate heat exchanger 2 is b kPa, the pressure drop of the cold storage of the evaporator of the first dual-mode refrigeration host 9 is c kPa, and the pressure drop of the cold storage of the evaporator of the second dual-mode refrigeration host 10 is d kPa. Assuming that the total resistance of the system pipeline and other valves is e kPa, the head of the cold storage parallel pump group 3 is Max{a+c+e,b+d+e}kPa, if a=1, b=2, c=3, d=4, e=5, f=6, then a+c+e=9, b+d+e=12, which means that the heads of the two pumps in the parallel pump group 3 can be 9m and 12m respectively. However, in the traditional distribution mode, the water pump must be considered according to the most unfavorable working conditions, so the head of the 9m water pump must also be increased to 12m. Therefore, when selecting the water pump, the head will be indirectly increased by 3m. The head of the cold storage water pump must be designed according to the most unfavorable working conditions, which will increase the power of some water pumps, increase energy consumption, cause energy waste, and reduce the energy efficiency ratio of the entire energy supply system. For this reason, if Figure 2 As shown, the cold storage device provided in the embodiment of the present application includes: a first cold storage circuit and a second cold storage circuit;

[0056] The first cold storage circuit includes: a first cold storage pump 13, a first plate heat exchanger 1 and a first dual-condition refrigeration host 9 connected in sequence; the second cold storage circuit includes: a second cold storage pump 14, a second plate heat exchanger 2 and a second dual-condition refrigeration host 10, and the first plate heat exchanger 1 and the second plate heat exchanger 2 are respectively connected to the cold storage water tank.

[0057] In the embodiment of the present application, the flow rate and head of the first cold storage pump 13 are smaller than the flow rate and head of the second cold storage pump 14, the heat exchange rate and pressure drop of the first plate heat exchanger 1 are smaller than the heat exchange rate and pressure drop of the second plate heat exchanger 2, and the cooling capacity and pressure drop of the first dual-condition refrigeration host 9 are smaller than the cooling capacity and pressure drop of the second dual-condition refrigeration host 10.

[0058] like Figure 2 As shown, the output port of the first cold storage pump 13 is connected to the first input port of the first plate heat exchanger 1, the first output port of the first plate heat exchanger 1 is connected to the input port of the cold storage water tank, the output port of the cold storage water tank is connected to the second input port of the first plate heat exchanger 1, the second output port of the first plate heat exchanger 1 is connected to the input port of the first dual-condition refrigeration host 9, and the output port of the first dual-condition refrigeration host 9 is connected to the input port of the first cold storage pump 13, so that a first cold storage circuit is formed, and the water flow circulation direction in the first cold storage circuit is: first cold storage pump 13→first plate heat exchanger 1→first dual-condition refrigeration host 9→first cold storage pump 13.

[0059] The output port of the second cold storage pump 14 is connected to the first input port of the second plate heat exchanger 2, the first output port of the second plate heat exchanger 2 is connected to the input port of the cold storage water tank, the output port of the cold storage water tank is connected to the second input port of the second plate heat exchanger 2, the second output port of the second plate heat exchanger 2 is connected to the input port of the second dual-condition refrigeration host 10, and the output port of the second dual-condition refrigeration host 10 is connected to the input port of the second cold storage pump 14, so that a second cold storage circuit is formed, and the water flow circulation direction in the second cold storage circuit is: second cold storage pump 14→second plate heat exchanger 2→second dual-condition refrigeration host 10→second cold storage pump 14.

[0060] Assume that the pressure drop of the first plate heat exchanger 1 is a kPa, the pressure drop of the second plate heat exchanger 2 is bkPa, the pressure drop of the cold storage of the evaporator of the first dual-condition refrigeration host 9 is c kPa, the pressure drop of the cold storage of the evaporator of the second dual-condition refrigeration host 10 is dkPa, and the total resistance of the system pipelines and other valves is e kPa. Since the first cold storage circuit and the second cold storage circuit are completely independent, the water pump head can be calculated and determined according to the actual resistance of different sections of the system, that is: the head of the first cold storage pump 13 requires a+c+ekPa, and the head of the second cold storage pump 14 requires b+d+ekPa. At this time, the water pump heads and resistances of the large and small machine systems are matched, and the flow rates of the first cold storage pump 13 and the second cold storage pump 14 can be determined according to the design conditions of the dual-condition host itself.

[0061] The embodiment of the present application uses a completely independent first cold storage circuit and a second cold storage circuit. On the one hand, the water pump head and resistance can be matched to avoid the situation where the power of some water pumps increases, reduce system energy consumption, avoid energy waste, and improve the energy efficiency ratio of the entire energy supply system; on the other hand, through the direct connection of the pump, the water pump can directly provide head and flow on demand, achieve uniform system flow distribution, reduce flow attenuation caused by parallel connection of water pumps, and at the same time reduce system resistance and improve system energy efficiency; moreover, there is no need to separately provide electric regulating valves and heat meters / flow meters to meet the system resistance balance during host cold storage and cooling, reduce the use of system temperature and pressure sensors, and simplify system control while achieving uniform system flow distribution, improve system stability, and reduce the initial investment cost of the system.

[0062] In yet another embodiment of the present application, the cold storage device further comprises: a first check valve and a second check valve;

[0063] The first check valve is disposed between the first cold storage pump 13 and the first plate heat exchanger 1 in the first cold storage circuit, and the second check valve is disposed between the second cold storage pump 14 and the second plate heat exchanger 2 in the second cold storage circuit.

[0064] During operation, since the first cold storage pump 13 and the second cold storage pump 14 are responsible for their respective loop pressure drops, the dynamic pressure at point AB before the inlet of the first cold storage pump 13 and the second cold storage pump 14 is 0, and check valves are provided in front of the first cold supply pump 11 and the second cold supply pump 12, the water flow will not flow toward the end during cold storage; the system can achieve uniform flow distribution without an electric regulating valve.

[0065] like Figure 1 As shown, in the traditional water storage cooling system, the water flow circulation of the small unit is: the second cooling parallel pump group 6→No. III regulating valve 7→the first dual-mode refrigeration host 9→No. I electric switch valve 16→terminal load→the conventional second cooling parallel pump group 6, and the water flow circulation of the large unit is: the conventional second cooling parallel pump group 6→No. IV regulating valve 8→the second dual-mode refrigeration host 10→No. I electric switch valve 16→terminal load→the conventional second cooling parallel pump group 6. Since the return water section of the large and small units in the water flow circulation share the pipeline where the cooling parallel pump group 6 is located, there are also common pipelines in the water supply section, and since the high-efficiency water storage cooling system generally adopts the form of matching large and small units to meet the storage and discharge needs of each load section of the system. The pressure drop of evaporators of different models will be different, resulting in uneven flow distribution in the water circulation pipelines of large and small units. The flow distribution in the water circulation pipeline with large resistance will be small, and the flow distribution in the water circulation pipeline with small resistance will be large. It is necessary to adjust through the No. III regulating valve 7 and the No. IV regulating valve 8, and close the No. I electric regulating valve 4 and the No. II electric regulating valve 5, and open the No. I electric switch valve 16. The large number of regulating valves will increase the control difficulty of the group control system and greatly increase the cost. Moreover, the traditional water storage cooling system must be equipped with regulating valves + heat meters / flow meters, temperature sensors, pressure sensors, etc. to realize pump and valve linkage control to balance the system flow distribution, which will also increase the cost.

[0066] Assuming that the pressure drop of the evaporator of the first dual-mode refrigeration host 9 is f kPa, the pressure drop of the evaporator of the second dual-mode refrigeration host 10 is g kPa, and the total resistance of the system except the refrigeration host is h kPa, then the head of the first cooling pump 11 needs f kPa, the head of the second cooling pump 12 needs g kPa, and the head of the conventional cooling secondary pump 15 needs h kPa, then the head of the second cooling parallel pump group 6 is Max{f+h,g+h}kPa, which will also indirectly increase some heads. The head of the cooling water pump must be designed according to the most unfavorable working conditions, resulting in increased power of some water pumps, increased energy consumption, energy waste, and reduced energy efficiency of the entire energy supply system. For this reason, if Figure 2 As shown, the cooling device provided in the embodiment of the present application includes: a first cooling circuit and a second cooling circuit;

[0067] The first cooling circuit includes: a first cooling pump 11, the first dual-mode refrigeration main unit 9 and a first cooling parallel pump group 15 connected in sequence; the second cooling circuit includes: a second cooling pump 12, the second dual-mode refrigeration main unit 10 and the first cooling parallel pump group 15 connected in sequence, and the first cooling pump 11, the second cooling pump 12 and the first cooling parallel pump group 15 are respectively connected to the target load.

[0068] In the embodiment of the present application, the flow rate and lift of the first cooling pump 11 are smaller than the flow rate and lift of the second cooling pump 12 .

[0069] like Figure 2 As shown, the output port of the first cooling pump 11 is connected to the input port of the first dual-mode refrigeration host 9, the output port of the first dual-mode refrigeration host 9 is connected to the input port of the first cooling parallel pump group 15, the output port of the first cooling parallel pump group 15 is connected to the input port of the terminal load, and the output port of the target load is connected to the input port of the first cooling pump 11, so that a first cooling circuit is formed, and the water flow circulation direction in the first cooling circuit is: first cooling pump 11→first dual-mode refrigeration host 9→first cooling parallel pump group 15→terminal load→first cooling pump 11.

[0070] The output port of the second cooling pump 12 is connected to the input port of the second dual-mode refrigeration host 10, the output port of the second dual-mode refrigeration host 10 is connected to the input port of the first cooling parallel pump group 15, the output port of the first cooling parallel pump group 15 is connected to the input port of the end load, and the output port of the target load is connected to the input port of the second cooling pump 12. In this way, a second cooling circuit is formed, and the water flow circulation direction in the second cooling circuit is: second cooling pump 12→second dual-mode refrigeration host 10→first cooling parallel pump group 15→end load→second cooling pump 12.

[0071] Assuming that the pressure drop of the evaporator of the first dual-mode refrigeration host 9 for cooling is f kPa, the pressure drop of the evaporator of the second dual-mode refrigeration host 10 for cooling is g kPa, and the total resistance of the system except the refrigeration host is h kPa, the head of the first cooling pump 11 needs fkPa, the head of the second cooling pump 12 needs g kPa, and the head of the conventional cooling secondary pump 15 needs h kPa. At this time, the head of the water pumps of the large and small systems matches the resistance, and the flow rates of the first cooling pump 11 and the second cooling pump 12 can be determined according to the design conditions of the dual-mode host itself, and the flow rate of the conventional cooling secondary pump 15 is designed according to the terminal demand.

[0072] The embodiment of the present application uses a completely independent first cooling circuit and a second cooling circuit. On the one hand, the water pump head and resistance can be matched to avoid the situation where the power of some water pumps increases, reduce system energy consumption, avoid energy waste, and improve the energy efficiency of the entire energy supply system; on the other hand, through the direct connection of the pump, the water pump can directly provide head and flow on demand, achieve uniform system flow distribution, reduce flow attenuation caused by parallel connection of water pumps, and at the same time reduce system resistance and improve system energy efficiency; moreover, there is no need to separately provide electric regulating valves and heat meters / flow meters to meet the system resistance balance when the main unit is cooling, reduce the use of system temperature and pressure sensors, and simplify system control while achieving uniform system flow distribution, improve system stability, and reduce the initial investment cost of the system.

[0073] In yet another embodiment of the present application, the cooling device further comprises: a third check valve and a fourth check valve;

[0074] The third check valve is arranged between the first cooling pump 11 and the first dual-mode refrigeration host 9 in the first cooling circuit, and the fourth check valve is arranged between the second cooling pump 12 and the second dual-mode refrigeration host 10 in the second cooling circuit.

[0075] During operation, since the first cooling pump 11 and the second cooling pump 12 are respectively responsible for the pressure drop of the first dual-mode refrigeration host 9 and the second dual-mode refrigeration host 10, the dynamic pressure at point AB before the water pump inlet is 0, and check valves are arranged in front of the first cold storage pump 13 and the second cold storage pump 14, the water flow will not flow toward the first plate heat exchanger 1 and the second plate heat exchanger 2 during cold storage; the conventional cold supply secondary pump 15 provides a head of h kPa to meet the cold demand at the terminal, and the system can also achieve uniform flow distribution without an electric regulating valve.

[0076] In another embodiment of the present application, an air conditioning system is provided, comprising: a cold storage device as described in any of the aforementioned embodiments and a cold supply device as described in any of the aforementioned embodiments.

[0077] The embodiment of the present application uses a completely independent first cold storage circuit and a second cold storage circuit. On the one hand, the water pump head and resistance can be matched to avoid the situation where the power of some water pumps increases, reduce system energy consumption, avoid energy waste, and improve the energy efficiency ratio of the entire energy supply system; on the other hand, through the direct connection of the pump, the water pump can directly provide head and flow on demand, achieve uniform system flow distribution, reduce flow attenuation caused by parallel connection of water pumps, and at the same time reduce system resistance and improve system energy efficiency; moreover, there is no need to separately provide electric regulating valves and heat meters / flow meters to meet the system resistance balance during host cold storage and cooling, reduce the use of system temperature and pressure sensors, and simplify system control while achieving uniform system flow distribution, improve system stability, and reduce the initial investment cost of the system.

[0078] Moreover, the embodiment of the present application uses a completely independent first cooling circuit and a second cooling circuit. On the one hand, it can match the water pump head and resistance, avoid the situation where the power of some water pumps increases, reduce system energy consumption, avoid energy waste, and improve the energy efficiency of the entire energy supply system; on the other hand, through the direct connection of the pump, the water pump can directly provide head and flow on demand, achieve uniform system flow distribution, reduce the flow attenuation caused by parallel connection of water pumps, and at the same time reduce system resistance and improve system energy efficiency; moreover, there is no need to separately provide an electric regulating valve or heat meter / flow meter to meet the system resistance balance when the main unit is cooling, reduce the use of system temperature and pressure sensors, and simplify system control while achieving uniform system flow distribution, improve system stability, and reduce the initial investment cost of the system.

[0079] In another embodiment of the present application, a control method for the cold storage device as described in the above embodiment or the air conditioning system as described in the above embodiment is also provided. Figure 3 As shown, the control method may include the following steps:

[0080] Step S101, obtaining a first system load of the air conditioning system in a cold storage mode;

[0081] In the embodiment of the present application, the first system load is determined according to the volume of the cold storage tank. Specifically, in the cold storage mode, the first system load = total cooling capacity / number of main units in operation / nighttime cold storage time, wherein the nighttime cold storage time can be set according to actual conditions, such as 8 hours. The total cooling capacity is determined by the cooling capacity stored in the cold storage tank and the cooling capacity provided by the cold storage tank for daytime cold demand. The cooling capacity stored in the cold storage tank is determined in the following manner: the mass of the cold storage medium can be calculated according to the volume of the cold storage tank and the density of the cold storage medium, and the heat Q = cmdt, c is the specific heat capacity of the cold storage medium, dt is the difference between the supply water temperature and the return water temperature, and the heat Q1 obtained is the cooling capacity stored in the cold storage tank; similarly, the cooling capacity required during the day is determined in the following manner: the mass of the cold storage medium is calculated according to the flow rate of the cold storage medium output by the cold storage tank, and the cooling capacity Q2 required during the day can be calculated based on the heat Q = cmdt.

[0082] Step S102, when the first system load is less than or equal to the first cold storage threshold, controlling the first dual-mode refrigeration host 9 and the first cold storage pump 13 to start, and the operating frequency of the first cold storage pump 13 is determined according to the cooling capacity of the first dual-mode refrigeration host 9;

[0083] In the embodiment of the present application, the control strategy of the operating frequency of the first cold storage pump 13 is: to increase or decrease according to the cooling capacity of the first dual-mode refrigeration host 9. When the temperature difference is constant, the load is proportional to the flow rate. When the load is high, the pump frequency increases, and when the load is low, the pump frequency decreases. For example: when the system load is 1000kW and the supply and return water temperature difference is 5°C, the flow rate is 172m3 / h, and the head is f at this time; when the system load suddenly changes to 2000kW and the supply and return water temperature difference is 5°C, the flow rate is 344m3 / h. 3 / h, at this time the head is F, the resistance of the same pipe diameter under different flow rates is different, F is definitely greater than f, therefore, this application is to achieve the flow rate and head of the pipeline itself through water pump frequency modulation.

[0084] Step S103, when the first system load is greater than the first cold storage threshold and the first system load is less than or equal to the second cold storage threshold, control the second dual-mode refrigeration host 10 and the second cold storage pump 14 to start, and the operating frequency of the second cold storage pump 14 is determined according to the cooling capacity of the second dual-mode refrigeration host 10;

[0085] The principle of the control strategy of the operating frequency of the second cold storage pump 14 is similar to that of the first cold storage pump 13 , and will not be described in detail here.

[0086] Step S104, when the first system load is greater than the second cold storage threshold, the first dual-condition refrigeration host 9, the first cold storage pump 13, the second dual-condition refrigeration host 10 and the second cold storage pump 14 are controlled to be turned on, the operating frequency of the first cold storage pump 13 is determined according to the cooling capacity of the first dual-condition refrigeration host 9, and the operating frequency of the second cold storage pump 14 is determined according to the cooling capacity of the second dual-condition refrigeration host 10.

[0087] Assume that the cooling capacity of the first dual-condition refrigeration host 9 during cold storage is Q, and the high-efficiency range is Q1-Q2, and the cooling capacity of the second dual-condition refrigeration host 10 during cold storage is R, and the high-efficiency range is R1-R2. To ensure that the host is in the high-efficiency operation range:

[0088] When the first system load X≤the first cold storage threshold value Q2, only the first dual-mode refrigeration host 9 and its corresponding first cold storage pump 13 are turned on, and the first cold storage pump 13 directly adjusts the operating frequency according to the cooling capacity of the first dual-mode refrigeration host 9 to provide the flow and lift required by the first plate heat exchanger 1 and the first dual-mode refrigeration host 9;

[0089] When the first system load first cold storage threshold Q2<first system load X≤second cold storage threshold R2, only the second dual-mode refrigeration host 10 and its corresponding second cold storage pump 14 are turned on, and the second cold storage pump 14 directly adjusts the operating frequency according to the cooling capacity of the second dual-mode refrigeration host 10 to provide the flow and lift required by the second plate heat exchanger 2 and the second dual-mode refrigeration host 10;

[0090] When the first system load X is greater than the second cold storage threshold R2, the first dual-condition refrigeration host 9 and the second dual-condition refrigeration host 10 and their corresponding first cold storage pumps 13 and second cold storage pumps 14 are turned on together, and the first cold storage pumps 13 and second cold storage pumps 14 directly adjust the operating frequency according to the cooling capacity of the first dual-condition refrigeration host 9 and the second dual-condition refrigeration host 10 to provide the flow and lift required by each system.

[0091] The embodiment of the present application automatically selects to use the first cold storage circuit and / or the second cold storage circuit to store water in the cold storage water tank based on the size of the first system load, thereby ensuring that the cold storage energy efficiency matches the cold storage demand.

[0092] In another embodiment of the present application, a control method for the cooling device as described in the above embodiment or the air conditioning system as described in the above embodiment is also provided. Figure 4 As shown, the control method may include the following steps:

[0093] Step S201, obtaining a second system load of the air-conditioning system in a cooling mode;

[0094] In the embodiment of the present application, the second system load can be calculated based on the supply and return water temperatures of the terminal load. Specifically, the mass of the cold storage medium is calculated based on the flow rate of the cold storage medium output to the terminal load. According to the heat Q=cmdt, c is the specific heat capacity of the cold supply medium, dt is the difference between the supply water temperature and the return water temperature of the terminal load, the second system load Q3 can be calculated.

[0095] Step S202, when the load of the second system is less than or equal to the first cooling threshold, controlling the first dual-mode refrigeration host 9, the first cooling pump 11 and the first cooling parallel pump group 15 to start, and the operating frequency of the first cooling pump 11 and the first cooling parallel pump group 15 is determined according to the cooling capacity of the first dual-mode refrigeration host 9;

[0096] Step S203, when the second system load is greater than the first cooling threshold and the system load is less than or equal to the second cooling threshold, control the second dual-mode refrigeration host 10, the second cooling pump 12 and the first cooling parallel pump group 15 to start, and the operating frequency of the second cooling pump 12 and the first cooling parallel pump group 15 is determined according to the cooling capacity of the second dual-mode refrigeration host 10;

[0097] Step S204, when the second system load is greater than the second cooling threshold, control the first dual-condition refrigeration host 9, the second dual-condition refrigeration host 10, the first cooling pump 11, the second cooling pump 12 and the first cooling parallel pump group 15 to turn on, and the operating frequency of the first cooling pump 11, the second cooling pump 12 and the first cooling parallel pump group 15 is determined according to the cooling capacity of the first dual-condition refrigeration host 9 and the second dual-condition refrigeration host 10.

[0098] Assume that the cooling capacity of the first dual-mode refrigeration host 9 is q, and the high-efficiency range is q1-q2, and the cooling capacity of the second dual-mode refrigeration host 10 is r, and the high-efficiency range is r1-r2. The second system load x is based on the terminal load demand to ensure that the host is in the high-efficiency operation range:

[0099] When the second system load x≤the first cooling threshold value q2, the supply and return water temperature, only the first dual-mode refrigeration host 9 and its corresponding first cooling pump 11 and conventional cooling secondary pump 15 are turned on, and the first cooling pump 11 and conventional cooling secondary pump 15 directly adjust the operating frequency according to the cooling capacity of the first dual-mode refrigeration host 9 to provide the flow and lift required by the system;

[0100] When the first cooling threshold q2<the second system load x≤the second cooling threshold r2, only the second dual-mode refrigeration host 10 and its corresponding second cooling pump 12 and the conventional cooling secondary pump 15 are turned on, and the second cooling pump 12 and the conventional cooling secondary pump 15 directly adjust the operating frequency according to the cooling capacity of the second dual-mode refrigeration host 10 to provide the flow and lift required by the system;

[0101] When the second system load x>the second cooling threshold value r2, the first dual-condition refrigeration host 9 and the second dual-condition refrigeration host 10 and their corresponding first cooling pump 11, second cooling pump 12 and conventional cooling secondary pump 15 are turned on together, and the first cooling pump 11, the second cooling pump 12 and the conventional cooling secondary pump 15 directly adjust the operating frequency according to the cooling capacity of the first dual-condition refrigeration host 9 and the second dual-condition refrigeration host 10 to provide the flow and lift required by the system.

[0102] The embodiment of the present application automatically selects to use the second cooling circuit and / or the second cooling circuit to cool the terminal load based on the size of the second system load, thereby ensuring that the cooling energy efficiency matches the cooling demand.

[0103] In another embodiment of the present application, a control device for the cold storage device as described in the above embodiment or for the air conditioning system as described in the above embodiment is also provided. Figure 5 As shown, the control device includes:

[0104] A first acquisition module 101 is used to acquire a first system load of the air-conditioning system in a cold storage mode;

[0105] A first control module 102 is used to control the first dual-mode refrigeration host 9 and the first cold storage pump 13 to start when the first system load is less than or equal to a first cold storage threshold, and the operating frequency of the first cold storage pump 13 is determined according to the cooling capacity of the first dual-mode refrigeration host 9;

[0106] The second control module 103 is used to control the second dual-mode refrigeration host 10 and the second cold storage pump 14 to start when the first system load is greater than the first cold storage threshold and the first system load is less than or equal to the second cold storage threshold, and the operating frequency of the second cold storage pump 14 is determined according to the cooling capacity of the second dual-mode refrigeration host 10;

[0107] The third control module 104 is used to control the first dual-condition refrigeration host 9, the first cold storage pump 13, the second dual-condition refrigeration host 10 and the second cold storage pump 14 to start when the first system load is greater than the second cold storage threshold, the operating frequency of the first cold storage pump 13 is determined according to the cooling capacity of the first dual-condition refrigeration host 9, and the operating frequency of the second cold storage pump 14 is determined according to the cooling capacity of the second dual-condition refrigeration host 10.

[0108] In another embodiment of the present application, a control device for the cooling device as described in the above embodiment or for the air conditioning system as described in the above embodiment is also provided. Figure 6 As shown, the control device includes:

[0109] The second acquisition module 201 is used to acquire a second system load of the air-conditioning system in a cooling mode;

[0110] The fourth control module 202 is used to control the first dual-mode refrigeration host 9, the first cooling pump 11 and the first cooling parallel pump group 15 to start when the second system load is less than or equal to the first cooling threshold, and the operating frequency of the first cooling pump 11 and the first cooling parallel pump group 15 is determined according to the cooling capacity of the first dual-mode refrigeration host 9;

[0111] a fifth control module 203, configured to control the second dual-mode refrigeration host 10, the second cooling pump 12, and the first cooling parallel pump group 15 to start when the second system load is greater than the first cooling threshold and the system load is less than or equal to the second cooling threshold, wherein the operating frequencies of the second cooling pump 12 and the first cooling parallel pump group 15 are determined according to the cooling capacity of the second dual-mode refrigeration host 10;

[0112] The sixth control module 204 is used to control the first dual-condition refrigeration host 9, the second dual-condition refrigeration host 10, the first cooling pump 11, the second cooling pump 12 and the first cooling parallel pump group 15 to start up when the second system load is greater than the second cooling threshold value. The operating frequency of the first cooling pump 11, the second cooling pump 12 and the first cooling parallel pump group 15 is determined according to the cooling capacity of the first dual-condition refrigeration host 9 and the second dual-condition refrigeration host 10.

[0113] In another embodiment of the present application, an electronic device is provided, including a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus;

[0114] Memory, used to store computer programs;

[0115] The processor is used to implement the control method described in the above method embodiment when executing the program stored in the memory.

[0116] In the electronic device provided by the embodiment of the present invention, the processor automatically selects to use the first cold storage circuit and / or the second cold storage circuit to store water in the cold storage water tank based on the size of the first system load by executing the program stored in the memory, thereby ensuring that the cold storage energy efficiency matches the cold storage demand; or, based on the size of the second system load, automatically selects to use the second cooling circuit and / or the second cooling supply circuit to supply cooling to the terminal load, thereby ensuring that the cooling energy efficiency matches the cooling demand.

[0117] The communication bus 1140 mentioned in the above electronic device can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The communication bus 1140 can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 7 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0118] The communication interface 1120 is used for communication between the electronic device and other devices.

[0119] The memory 1130 may include a random access memory (RAM) or a non-volatile memory, such as at least one disk memory. Optionally, the memory may also be at least one storage device located away from the aforementioned processor.

[0120] The above-mentioned processor 1110 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0121] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0122] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A cold storage device, characterized in that: include: a first cold storage circuit and a second cold storage circuit; The first cold storage circuit comprises: a first cold storage pump (13), a first plate heat exchanger (1) and a first dual-mode refrigeration main unit (9) which are connected in sequence; The second cold storage circuit comprises: a second cold storage pump (14), a second plate heat exchanger (2) and a second dual-mode refrigeration host (10); The first plate heat exchanger (1) and the second plate heat exchanger (2) are respectively connected to a cold water storage tank.

2. The cold storage device according to claim 1, characterized in that: Also includes: a first check valve and a second check valve; The first check valve is arranged between the first cold storage pump (13) and the first plate heat exchanger (1) in the first cold storage circuit, and the second check valve is arranged between the second cold storage pump (14) and the second plate heat exchanger (2) in the second cold storage circuit.

3. A cooling device, characterized in that: include: a first cooling circuit and a second cooling circuit; The first cooling circuit comprises: a first cooling pump (11), a first dual-mode refrigeration host (9) and a first cooling parallel pump group (15) which are connected in sequence; The second cooling circuit comprises: a second cooling pump (12), a second dual-mode refrigeration host (10) and the first cooling parallel pump group (15) connected in sequence; The first cooling pump (11), the second cooling pump (12) and the first cooling parallel pump group (15) are respectively connected to a target load.

4. The cooling device according to claim 3, characterized in that: Also includes: a third check valve and a fourth check valve; The third check valve is arranged between the first cooling pump (11) and the first dual-mode refrigeration main unit (9) in the first cooling circuit, and the fourth check valve is arranged between the second cooling pump (12) and the second dual-mode refrigeration main unit (10) in the second cooling circuit.

5. An air conditioning system, characterized in that: include: A cold storage device as claimed in any one of claims 1 to 2 and a cold supply device as claimed in any one of claims 3 to 4.

6. A control method for the cold storage device according to claim 1 or 2 or the air conditioning system according to claim 5, characterized in that: include: Obtaining a first system load of the air conditioning system in a cold storage mode; When the first system load is less than or equal to a first cold storage threshold, the first dual-mode refrigeration host (9) and the first cold storage pump (13) are controlled to be turned on, and the operating frequency of the first cold storage pump (13) is determined according to the refrigeration capacity of the first dual-mode refrigeration host (9); When the first system load is greater than the first cold storage threshold and the first system load is less than or equal to the second cold storage threshold, the second dual-mode refrigeration host (10) and the second cold storage pump (14) are controlled to be turned on, and the operating frequency of the second cold storage pump (14) is determined according to the cooling capacity of the second dual-mode refrigeration host (10); When the first system load is greater than the second cold storage threshold, the first dual-condition refrigeration main unit (9), the first cold storage pump (13), the second dual-condition refrigeration main unit (10) and the second cold storage pump (14) are controlled to be turned on; the operating frequency of the first cold storage pump (13) is determined according to the refrigeration capacity of the first dual-condition refrigeration main unit (9); and the operating frequency of the second cold storage pump (14) is determined according to the refrigeration capacity of the second dual-condition refrigeration main unit (10).

7. A method for controlling the cooling device according to claim 3 or 4 or the air conditioning system according to claim 5, characterized in that: include: Obtaining a second system load of the air-conditioning system in a cooling mode; When the load of the second system is less than or equal to the first cooling threshold, the first dual-mode refrigeration host (9), the first cooling pump (11) and the first cooling parallel pump group (15) are controlled to start, and the operating frequency of the first cooling pump (11) and the first cooling parallel pump group (15) is determined according to the cooling capacity of the first dual-mode refrigeration host (9); When the second system load is greater than the first cooling threshold and the system load is less than or equal to the second cooling threshold, the second dual-mode refrigeration host (10), the second cooling pump (12) and the first cooling parallel pump group (15) are controlled to start, and the operating frequency of the second cooling pump (12) and the first cooling parallel pump group (15) is determined according to the cooling capacity of the second dual-mode refrigeration host (10); When the second system load is greater than the second cooling threshold, the first dual-mode refrigeration host (9), the second dual-mode refrigeration host (10), the first cooling pump (11), the second cooling pump (12) and the first cooling parallel pump group (15) are controlled to be turned on, and the operating frequency of the first cooling pump (11), the second cooling pump (12) and the first cooling parallel pump group (15) is determined according to the cooling capacity of the first dual-mode refrigeration host (9) and the second dual-mode refrigeration host (10).

8. A control device for the cold storage device according to claim 1 or 2 or for the air conditioning system according to claim 5, characterized in that: include: A first acquisition module, used to acquire a first system load of the air-conditioning system in a cold storage mode; A first control module, used for controlling the first dual-mode refrigeration host (9) and the first cold storage pump (13) to start when the first system load is less than or equal to a first cold storage threshold, wherein the operating frequency of the first cold storage pump (13) is determined according to the cooling capacity of the first dual-mode refrigeration host (9); a second control module, for controlling the second dual-mode refrigeration host (10) and the second cold storage pump (14) to start when the first system load is greater than the first cold storage threshold and the first system load is less than or equal to the second cold storage threshold, wherein the operating frequency of the second cold storage pump (14) is determined according to the cooling capacity of the second dual-mode refrigeration host (10); A third control module is used for controlling the first dual-condition refrigeration main unit (9), the first cold storage pump (13), the second dual-condition refrigeration main unit (10) and the second cold storage pump (14) to start when the first system load is greater than the second cold storage threshold value, wherein the operating frequency of the first cold storage pump (13) is determined according to the cooling capacity of the first dual-condition refrigeration main unit (9), and the operating frequency of the second cold storage pump (14) is determined according to the cooling capacity of the second dual-condition refrigeration main unit (10).

9. A control device for the cooling device according to claim 3 or 4 or for the air conditioning system according to claim 5, characterized in that: include: A second acquisition module, used to acquire a second system load of the air-conditioning system in a cooling mode; a fourth control module, for controlling the first dual-mode refrigeration host (9), the first refrigeration pump (11) and the first refrigeration parallel pump group (15) to start when the second system load is less than or equal to the first refrigeration threshold, wherein the operating frequency of the first refrigeration pump (11) and the first refrigeration parallel pump group (15) is determined according to the refrigeration capacity of the first dual-mode refrigeration host (9); a fifth control module, for controlling the second dual-mode refrigeration host (10), the second refrigeration pump (12) and the first refrigeration parallel pump group (15) to start when the second system load is greater than the first refrigeration threshold and the system load is less than or equal to the second refrigeration threshold, wherein the operating frequency of the second refrigeration pump (12) and the first refrigeration parallel pump group (15) is determined according to the refrigeration capacity of the second dual-mode refrigeration host (10); A sixth control module is used for controlling the first dual-condition refrigeration host (9), the second dual-condition refrigeration host (10), the first cooling pump (11), the second cooling pump (12) and the first cooling parallel pump group (15) to start when the second system load is greater than the second cooling threshold value, wherein the operating frequency of the first cooling pump (11), the second cooling pump (12) and the first cooling parallel pump group (15) is determined according to the cooling capacity of the first dual-condition refrigeration host (9) and the second dual-condition refrigeration host (10).

10. An electronic device, characterized in that: It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus; Memory, used to store computer programs; The processor is used to implement the control method according to claim 6 or the control method according to claim 7 when executing the program stored in the memory.

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