Energy supply system, energy supply control method and storage medium

Abstract

The invention discloses an energy supply system, an energy supply control method and a storage medium. The energy supply system comprises a photovoltaic photo-thermal assembly, a heat exchange module, a heat exchange module and a power supply module, the domestic hot water tank is connected in series with the heat exchange channel to form circulation; the phase change heat storage device is connected with the domestic hot water tank in parallel and forms circulation with the heat exchange channel; the water chilling unit is connected with the phase change heat storage device, and the phase change heat storage device provides a driving heat source for the water chilling unit; the cold storage device is connected with the water chilling unit; the ice storage device is connected with the water chilling unit; and the tail end is connected to the water chilling unit, the cold storage device and the ice storage device. The cold source and the heat source are subjected to redundancy design, hot water supply and heat storage are achieved through heat of the photovoltaic photo-thermal assembly, gradient utilization of energy is achieved, different requirements of users can be met through cold storage and ice storage, peak regulation is achieved, supply and demand matching is guaranteed, and the system is stable; the problems that supply and demand are not matched and refrigeration and heating output volatility is large during photovoltaic module waste heat utilization are solved.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, and in particular to an energy supply system, an energy supply control method and a storage medium. Background Art

[0002] With the continuous growth of my country's economy, the continuous improvement of people's quality of life and the rapid development of cities, building energy consumption has become an important part of my country's total energy consumption. Therefore, building energy conservation has become an important means for my country to achieve sustainable development.

[0003] As a typical new energy source, solar energy has the characteristics of large storage capacity, clean and pollution-free, and wide distribution. However, it also has disadvantages such as low energy density and difficulty in utilization. In addition, there is a great contradiction between the seasonal supply capacity of a single energy source and the time scale of the actual energy demand of the terminal. In particular, the utilization of solar energy varies greatly with the seasons, climate, and day and night, and the energy supply stability is poor. It needs to be organically coordinated with different grades of energy to ensure the diversification and stabilization of energy supply and improve the comprehensive utilization efficiency of energy.

[0004] At present, solar photovoltaic uses photovoltaic (PV) cells to achieve photoelectric conversion. However, the actual photoelectric conversion efficiency of PV cells is much lower than that under experimental conditions. On the one hand, this is because the performance of the components has been attenuated, and on the other hand, the increase in component temperature will reduce the photoelectric conversion efficiency. Therefore, reducing the component temperature is the key to improving the working efficiency of photovoltaic components. Fluid channels can be used on the back of photovoltaic components to take away the heat of the components to improve their photoelectric conversion performance and realize solar thermal utilization, that is, solar photovoltaic and thermal integrated components. The heat taken away is used to meet the user's domestic water needs, but in summer, hot water production is also sufficient, and there is far more than enough for domestic hot water, so there is a problem of mismatch between supply and demand, and in summer, users' demand for cooling load is much higher than the heating load. In addition, in the existing photovoltaic component waste heat utilization energy supply system, the redundant design is insufficient, and the cooling and heating output fluctuates greatly.

[0005] There is currently no effective solution to the problems of mismatched supply and demand and large fluctuations in cooling and heating output when utilizing waste heat from photovoltaic modules in the existing technology. Summary of the invention

[0006] The embodiments of the present invention provide an energy supply system, an energy supply control method and a storage medium, so as to at least solve the problems in the prior art of mismatch between supply and demand and large fluctuation in cooling and heating output when utilizing waste heat of photovoltaic modules.

[0007] In order to solve the above technical problems, an embodiment of the present invention provides an energy supply system, including:

[0008] Photovoltaic thermal components are provided with heat exchange channels;

[0009] A domestic hot water tank is connected in series with the heat exchange channel to form a circulation;

[0010] A phase-change heat storage device, connected in parallel with the domestic hot water tank and forming a cycle with the heat exchange channel;

[0011] A chiller connected to the phase-change heat storage device, wherein the phase-change heat storage device provides a driving heat source for the chiller;

[0012] A cold storage device connected to the chiller;

[0013] An ice storage device connected to the chiller;

[0014] The ends are respectively connected to the chiller, the cold storage device and the ice storage device.

[0015] Optionally, the energy supply system further includes:

[0016] A buffer water tank connected between the outlet of the heat exchange channel and the inlet of the domestic hot water tank;

[0017] The first heating device is installed in the buffer water tank and is used to heat the water in the buffer water tank so as to transport hot water from the buffer water tank to the domestic hot water tank when the water temperature in the buffer water tank reaches a first preset temperature.

[0018] Optionally, the energy supply system further includes: a second heating device, connected between the outlet of the heat exchange channel and the inlet of the buffer water tank, for heating water flowing out of the heat exchange channel.

[0019] Optionally, a first valve is provided at the outlet of the heat exchange channel, a second valve is provided at the inlet of the domestic hot water tank, a third valve is provided at the outlet of the domestic hot water tank, and a water pump is provided in the circulation loop formed by the domestic hot water tank and the heat exchange channel and in the circulation loop formed by the phase change heat storage device and the heat exchange channel.

[0020] Optionally, the phase change heat storage device comprises: a heat collection side coil and a heating side coil;

[0021] The heat collecting side coil is connected in parallel with the domestic hot water tank, a fourth valve is provided at the inlet of the heat collecting side coil, and a fifth valve is provided at the outlet of the heat collecting side coil;

[0022] The heating side coil is connected to the absorber in the chiller to form a circulation, and a sixth valve is arranged on the connecting pipeline between the outlet of the heating side coil and the inlet of the absorber. The chiller is a hot water type lithium bromide chiller.

[0023] Optionally, the chiller comprises:

[0024] a chilled water supply port connected to the water inlet of the end through a seventh valve, connected to the first port of the cold storage device through an eighth valve, and also connected to the first port of the ice storage device through a ninth valve;

[0025] A chilled water return port is connected to the water outlet of the end through a first pipeline, and a tenth valve, a first circulation pump and an eleventh valve are sequentially arranged on the first pipeline along the return direction;

[0026] The second port of the cold storage device is connected between the tenth valve and the first circulation pump through the twelfth valve;

[0027] The second port of the ice storage device is connected to between the first circulation pump and the eleventh valve through a thirteenth valve.

[0028] Optionally, the second port of the cold storage device is also connected to the return water port at the end through a fourteenth valve, a second circulation pump and a fifteenth valve in sequence.

[0029] Optionally, the ice storage device includes: a refrigeration compressor, a condenser, a throttling element and a refrigeration evaporator which are connected in a cycle in sequence, the refrigeration evaporator is provided with a refrigeration evaporation coil for circulating the refrigerant, and the refrigeration evaporator is provided with a first port and a second port for forming a cycle with the chiller and with the terminal.

[0030] The embodiment of the present invention further provides an energy supply control method, which is applied to the energy supply system described in the embodiment of the present invention, and the method includes:

[0031] When the water temperature in the domestic hot water tank is greater than or equal to the set temperature, the heat of the photovoltaic thermal component is used to store heat in the phase change thermal storage device;

[0032] In the chilled water mode, the chiller supplies chilled water to the terminal and stores ice in the ice storage device under the driving heat source provided by the phase change heat storage device. If the output cooling capacity of the chiller is greater than the sum of the cooling capacity required by the terminal and the cooling capacity required by the ice storage device, the cooling storage device is stored with the chiller. If the output cooling capacity of the chiller is less than the cooling capacity required by the terminal, the cooling storage device is used to supply chilled water to the terminal to make up for the lack of cooling capacity.

[0033] In the ice slurry water mode, the ice storage device is used to supply ice slurry water to the end.

[0034] Optionally, the chiller supplies chilled water to the terminal under the driving heat source provided by the phase change thermal storage device, including:

[0035] Opening the sixth valve so that the phase-change heat storage device provides a driving heat source for the chiller to drive the chiller to operate;

[0036] The seventh valve, the tenth valve, the first circulation pump and the eleventh valve are opened to connect the water supply pipeline and the water return pipeline between the chiller and the terminal.

[0037] Optionally, storing ice in the ice storage device includes: starting a refrigeration compressor in the ice storage device, and opening a ninth valve and a thirteenth valve to allow the chiller to deliver chilled water to the ice storage device.

[0038] Optionally, storing cold in the cold storage device through the chiller includes: opening the eighth valve and the twelfth valve, and controlling the fourteenth valve, the fifteenth valve, the second circulation pump, the ninth valve and the thirteenth valve to remain closed.

[0039] Optionally, the cold storage device is used to supply chilled water to the end to make up for the lack of cold, including: opening the eighth valve, the fourteenth valve, the fifteenth valve and the second circulation pump, and closing the twelfth valve, the ninth valve and the thirteenth valve.

[0040] Optionally, in the ice slurry water mode, using the ice storage device to supply ice slurry water to the terminal includes:

[0041] The chiller is not running, and the sixth valve, the eighth valve, the fourteenth valve, the fifteenth valve, the eleventh valve, the twelfth valve and the second circulation pump are closed;

[0042] Open the ninth valve and the seventh valve to allow the ice storage device to supply ice slurry water to the end;

[0043] Opening the tenth valve, the first circulation pump and the thirteenth valve to allow the return water at the end to return to the ice storage device;

[0044] When the ice slurry water in the ice storage device is insufficient, the refrigeration compressor in the ice storage device is started.

[0045] Optionally, before utilizing the heat of the photovoltaic thermal assembly to store heat in the phase change thermal storage device, the method further includes:

[0046] Detecting the temperature of the photovoltaic thermal assembly;

[0047] If the temperature of the photovoltaic thermal assembly is greater than the temperature threshold, the first valve is opened to allow water flowing out of the heat exchange channel to enter the buffer water tank;

[0048] Detecting the water temperature in the buffer water tank;

[0049] If the water temperature in the buffer water tank is greater than or equal to the first preset temperature, the second valve, the third valve and the water pump are opened to transport hot water from the buffer water tank to the domestic hot water tank;

[0050] If the water temperature in the buffer water tank is greater than or equal to the second preset temperature and less than the first preset temperature, and the water volume in the buffer water tank is greater than or equal to the preset water volume, turning on the first heating device of the buffer water tank;

[0051] If the water temperature in the buffer water tank is lower than the second preset temperature, the second valve, the third valve and the water pump are closed.

[0052] Optionally, allowing the water flowing out of the heat exchange channel to enter the buffer water tank includes: turning on a second heating device to heat the water flowing out of the heat exchange channel and then sending the water into the buffer water tank.

[0053] Optionally, the heat of the photovoltaic thermal assembly is used to store heat in the phase change thermal storage device, including: opening the fourth valve and the fifth valve to send the water in the buffer water tank into the phase change thermal storage device for phase change heat storage.

[0054] The embodiment of the present invention further provides a non-volatile computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described in the embodiment of the present invention are implemented.

[0055] By applying the technical solution of the present invention, the temperature of the photovoltaic thermal module can be effectively reduced by circulating water, thereby improving its power generation efficiency; a redundant design is performed for the cold source and the heat source, and the heat of the photovoltaic thermal module is used to supply hot water. After meeting the hot water demand of the user, the heat of the photovoltaic thermal module can also be used for phase change heat storage, thereby realizing energy cascade utilization, making supply and demand more matched, and the stored heat is used as a heat source to drive the chiller for refrigeration to supply chilled water to the terminal. At the same time, cold and ice can be stored, and the waste heat of the photovoltaic thermal module can be stored as a source of chilled water and ice slurry water, which can meet the different needs of users, achieve peak load regulation, ensure supply and demand matching, effectively ensure system stability and reduce the operating cost of cooling, greatly improve the energy utilization rate of the photovoltaic thermal module, and solve the problem of mismatch between supply and demand and large fluctuation in cooling and heating output when the waste heat of the photovoltaic module is utilized. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 is a schematic diagram of an energy supply system provided by an embodiment of the present invention;

[0057] Figure 2 is another schematic diagram of the energy supply system provided by an embodiment of the present invention;

[0058] Figure 3 is another schematic diagram of an energy supply system provided by an embodiment of the present invention;

[0059] Figure 4 is a schematic diagram of an ice storage device provided by an embodiment of the present invention;

[0060] Figure 5 is a flow chart of an energy supply control method provided by an embodiment of the present invention;

[0061] Figure 6 is a flow chart of energy supply control provided by an embodiment of the present invention;

[0062] Description of reference numerals:

[0063] Photovoltaic thermal assembly 10, domestic hot water tank 20, phase change thermal storage device 30, chiller 40, cold storage device 50, ice storage device 60, terminal 70, buffer water tank 80, first heating device 81, first temperature sensor 82, second heating device 83;

[0064] a second temperature sensor 11, a first valve 12, a second valve 21, a third valve 22, a third temperature sensor 23, a water pump 24, a collector-side coil 31, a heating-side coil 32, a fourth valve 33, a fifth valve 34, a sixth valve 41, a seventh valve 71, an eighth valve 72, a ninth valve 73, a tenth valve 74, an eleventh valve 75, a twelfth valve 76, a thirteenth valve 77, a fourteenth valve 78, and a fifteenth valve 79;

[0065] Refrigeration compressor 61, condenser 62, throttling element 63, refrigeration evaporator 64;

[0066] A first circulation pump 91 , a second circulation pump 92 , a water distributor 1 , a water collector 2 , and a filter 3 . DETAILED DESCRIPTION

[0067] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0068] It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0069] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0070] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0071] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0072] Example 1

[0073] This embodiment provides an energy supply system. Figure 1 is a schematic diagram of an energy supply system provided by an embodiment of the present invention, such as Figure 1 As shown, the energy supply system includes: a photovoltaic thermal component 10, a domestic hot water tank 20, a phase change heat storage device 30, a chiller 40, a cold storage device 50, an ice storage device 60 and a terminal 70.

[0074] The photovoltaic thermal assembly 10 is provided with a heat exchange channel (see Figure 1 The heat exchange channel is used for circulating medium (such as water) to take away the heat in the photovoltaic thermal component 10 and cool the photovoltaic thermal component 10, thereby ensuring the power generation efficiency of the photovoltaic thermal component 10.

[0075] The domestic hot water tank 20 is connected in series with the heat exchange channel to form a cycle. The domestic hot water tank 20 can provide low-temperature water to the heat exchange channel to exchange heat with the photovoltaic thermal component 10. After the heat exchange, the photovoltaic thermal component 10 is cooled down and the water is heated up. The water flowing out of the heat exchange channel can be sent to the domestic hot water tank 20 for user use, thereby realizing the reuse of the waste heat of the photovoltaic thermal component 10.

[0076] The phase change heat storage device 30 is connected in parallel with the domestic hot water tank 20 and forms a cycle with the heat exchange channel. The water flowing out of the heat exchange channel can also be sent to the phase change heat storage device 30 for phase change heat storage. The phase change heat storage material in the phase change heat storage device 30 can be paraffin or a hydrated inorganic salt with CaCl2·6H2O as the main component.

[0077] The chiller 40 is connected to the phase change thermal storage device 30, and the phase change thermal storage device 30 provides a driving heat source for the chiller 40, which can fully utilize the waste heat of the photovoltaic thermal assembly 10 and avoid energy waste. The chiller 40 can specifically be a hot water type lithium bromide chiller.

[0078] The cold storage device 50 is connected to the chiller 40, and the cold storage device 50 can be cold stored by the chilled water output by the chiller 40. The cold storage device 50 can be a cold storage water tank or a phase change cold storage.

[0079] The ice storage device 60 is connected to the chiller 40 , and ice storage can be achieved through the operation of the ice storage device 60 itself and the chilled water output by the chiller 40 .

[0080] The terminal 70 is respectively connected to the chiller 40, the cold storage device 50 and the ice storage device 60, that is, the chiller 40, the cold storage device 50 and the ice storage device 60 are connected in parallel to the terminal 70, and the three can supply cold to the terminal 70. The corresponding cold supply source can be used according to actual usage requirements, for example, using the chiller 40 and / or the cold storage device 50 to supply chilled water to the terminal 70, and using the ice storage device 60 to supply ice slurry water to the terminal 70.

[0081] This embodiment can effectively reduce the temperature of the photovoltaic thermal components through circulating water and improve its power generation efficiency; redundant design is carried out for the cold source and the heat source, and the heat of the photovoltaic thermal components is used to supply hot water. After meeting the user's hot water demand, the heat of the photovoltaic thermal components can also be used for phase change heat storage to achieve energy cascade utilization, so that supply and demand are more matched, and the stored heat is used as a heat source to drive the chiller for refrigeration to supply chilled water to the terminal. At the same time, cold and ice can be stored, and the waste heat of the photovoltaic thermal components can be stored as a source of chilled water and ice slurry water, which can meet the different needs of users, achieve peak load regulation, ensure supply and demand matching, effectively ensure system stability and reduce the operating cost of cooling, greatly improve the energy utilization rate of the photovoltaic thermal components, and solve the problem of mismatch between supply and demand and large fluctuation in cooling and heating output when the waste heat of the photovoltaic components is utilized.

[0082] like Figure 2 As shown, the energy supply system further includes: a buffer water tank 80, connected between the outlet of the heat exchange channel and the inlet of the domestic hot water tank 20. The buffer water tank 80 is equipped with a first heating device 81, which is used to heat the water in the buffer water tank 80, so as to transport hot water from the buffer water tank 80 to the domestic hot water tank 20 when the water temperature in the buffer water tank 80 reaches a first preset temperature.

[0083] Specifically, the first heating device 81 can be installed at the bottom or inside the buffer water tank 80. A first temperature sensor 82 can be provided inside the buffer water tank 80 to detect the water temperature in the buffer water tank 80. The first preset temperature can be set according to actual conditions, for example, the first preset temperature is set to 70°C.

[0084] In this embodiment, a buffer water tank 80 and a first heating device 81 are provided. When the water temperature in the buffer water tank 80 does not reach the first preset temperature, the first heating device 81 is started to heat the water in the buffer water tank 80, thereby ensuring the demand for hot water supply to users.

[0085] like Figure 3 As shown, the energy supply system also includes: a second heating device 83, connected between the outlet of the heat exchange channel and the inlet of the buffer water tank 80, for heating the water flowing out of the heat exchange channel. In this embodiment, the low-grade hot water generated by the photovoltaic thermal assembly 10 can be converted into high-grade hot water by the second heating device 83, and then heated by the buffer water tank 80, thereby ensuring that the user's hot water demand is met to the greatest extent.

[0086] A second temperature sensor 11 may be provided at the photovoltaic thermal assembly 10 to detect the temperature of the photovoltaic thermal assembly 10 .

[0087] A first valve 12 is provided at the outlet of the heat exchange channel, a second valve 21 is provided at the inlet of the domestic hot water tank 20, and a third valve 22 is provided at the outlet of the domestic hot water tank 20. When the temperature of the photovoltaic thermal component 10 is greater than the temperature threshold, the first valve 12, the second valve 21 and the third valve 22 are opened to connect the domestic hot water tank 20 with the circulation loop formed by the heat exchange channel, so that the photovoltaic thermal component 10 is cooled by circulating water and domestic hot water can be provided to the user. Among them, the temperature of the photovoltaic thermal component 10 is greater than the temperature threshold, indicating that the power generation efficiency of the photovoltaic thermal component 10 is significantly affected, and the photovoltaic thermal component 10 needs to be cooled. The temperature threshold can be set according to the actual situation, and the temperature threshold is greater than the optimal operating temperature of the photovoltaic thermal component 10.

[0088] The phase change heat storage device 30 includes: a heat collecting side coil 31 and a heating side coil 32. The heat collecting side coil 31 is connected in parallel with the domestic hot water tank 20, a fourth valve 33 is provided at the inlet of the heat collecting side coil 31, and a fifth valve 34 is provided at the outlet of the heat collecting side coil 31. The heating side coil 32 is connected to the absorber in the chiller 40 to form a cycle, and a sixth valve 41 is provided on the connecting pipeline between the outlet of the heat supply side coil 32 and the inlet of the absorber.

[0089] A third temperature sensor 23 may be provided at the domestic hot water tank 20 to detect the water temperature in the domestic hot water tank 20. When the water temperature in the domestic hot water tank 20 is greater than or equal to the set temperature, it means that the user's hot water demand is met. At this time, the second valve 21 and the third valve 22 are closed, and the first valve 12, the fourth valve 33 and the fifth valve 34 are opened to connect the phase change heat storage device 30 with the circulation loop formed by the heat exchange channel, so as to use the excess heat of the photovoltaic thermal assembly 10 to store heat in the phase change heat storage device 30. When the chiller 40 needs to be operated, the sixth valve 41 is opened to connect the phase change heat storage device 30 with the circulation loop formed by the chiller 40, so as to provide a driving heat source for the chiller 40 through the phase change heat storage device 30.

[0090] In this embodiment, the phase change heat storage device 30 can fully utilize the excess heat of the photovoltaic thermal assembly 10 and provide a driving heat source for the chiller 40 .

[0091] A water pump 24 is provided in the circulation loop formed by the domestic hot water tank 20 and the heat exchange channel and the circulation loop formed by the phase change heat storage device 30 and the heat exchange channel to provide power for water circulation. Preferably, the water pump 24 can be provided on the common pipeline of the circulation loop formed by the domestic hot water tank 20 and the heat exchange channel and the circulation loop formed by the phase change heat storage device 30 and the heat exchange channel. The two circulation loops share the water pump, which can simplify the pipeline and save costs.

[0092] The chiller 40 includes a chilled water supply port and a chilled water return port.

[0093] The chilled water supply port is connected to the water inlet of the terminal 70 through the seventh valve 71, connected to the first port of the cold storage device 50 through the eighth valve 72, and connected to the first port of the ice storage device 60 through the ninth valve 73. The seventh valve 71 can be opened to supply chilled water to the terminal 70, the eighth valve 72 can be opened to enable the chiller 40 to store cold for the cold storage device 50 or to enable the cold storage device 50 to supply chilled water to the terminal 70, and the ninth valve 73 can be opened to enable the chiller 40 to store ice for the ice storage device 60 or to enable the ice storage device 60 to supply ice slurry water to the terminal 70.

[0094] The chilled water return port is connected to the water outlet of the terminal 70 through the first pipeline, and the tenth valve 74, the first circulation pump 91 and the eleventh valve 75 are sequentially arranged on the first pipeline along the return direction. By opening the tenth valve 74, the first circulation pump 91 and the eleventh valve 75, the return water of the terminal 70 can be returned to the chiller 40.

[0095] The second port of the cold storage device 50 is connected between the tenth valve 74 and the first circulation pump 91 through the twelfth valve 76. When the chiller 40 stores cold for the cold storage device 50, opening the twelfth valve 76 can ensure the circulation of water, thereby ensuring smooth cold storage.

[0096] The second port of the ice storage device 60 is connected between the first circulation pump 91 and the eleventh valve 75 through the thirteenth valve 77. Opening the thirteenth valve 77 allows the water returned from the terminal 70 to enter the ice storage device 60, ensuring that the cold storage device 50 continuously supplies ice slurry water to the terminal 70.

[0097] The second port of the cold storage device 50 is also connected to the return water port of the terminal 70 through the fourteenth valve 78, the second circulation pump 92 and the fifteenth valve 79. By opening the fourteenth valve 78, the second circulation pump 92 and the fifteenth valve 79, the return water of the terminal 70 can be smoothly returned to the cold storage device 50.

[0098] By providing the above-mentioned valve and its connection, the opening and closing of the above-mentioned valve can be controlled under different circumstances, so as to ensure the realization of cold storage, ice storage, supply of chilled water and supply of ice slurry water.

[0099] refer to Figure 3 A plurality of first circulating pumps 91 connected in parallel may be provided, and a plurality of second circulating pumps 92 connected in parallel may be provided, so as to ensure sufficient circulating power.

[0100] like Figure 4As shown, the ice storage device 60 includes: a refrigeration compressor 61, a condenser 62, a throttling element 63 and a refrigeration evaporator 64 which are connected in a cycle in sequence. The refrigeration evaporator 64 is provided with a refrigeration evaporation coil for circulating the refrigerant. The refrigeration evaporator 64 is provided with a first port and a second port (i.e., the first port and the second port of the cold storage device 60), which are used to form a cycle with the chiller 40 and a cycle with the terminal 70. The 7°C chilled water output by the chiller 40 enters the refrigeration evaporator 64, and the refrigerant evaporates in the refrigeration evaporator 64 to obtain ice slurry water, thereby realizing ice storage. This embodiment can realize ice storage and ice release (i.e., supply ice slurry water to the terminal 70) through the ice storage device 60.

[0101] Example 2

[0102] This embodiment provides an energy supply control method, which is applied to the energy supply system described in the above embodiment. Figure 5 is a flow chart of the energy supply control method provided by an embodiment of the present invention, such as Figure 5 As shown, the method comprises the following steps:

[0103] S501, when the water temperature in the domestic hot water tank 20 is greater than or equal to the set temperature, the heat of the photovoltaic thermal assembly 10 is used to store heat in the phase change thermal storage device 30.

[0104] S502, in the chilled water mode, the chiller 40 supplies chilled water to the terminal 70 and stores ice in the ice storage device 60 under the driving heat source provided by the phase change heat storage device 30. If the output cooling capacity of the chiller 40 is greater than the sum of the terminal demand cooling capacity and the ice storage demand cooling capacity, the cold storage device 50 is stored with the chiller 40. If the output cooling capacity of the chiller 40 is less than the terminal demand cooling capacity, the cold storage device 50 is used to supply chilled water to the terminal 70 to make up for the lack of cooling capacity.

[0105] S503, in the ice slurry water mode, the ice storage device 60 is used to supply ice slurry water to the terminal 70.

[0106] While meeting the demand for hot water supply, this embodiment utilizes the heat of the photovoltaic thermal components for heat storage, realizes energy cascade utilization, and makes supply and demand more matched; the stored heat is used as a heat source to drive the chiller to operate, and ice and cold can be stored while supplying chilled water to users through the chiller. The waste heat of the photovoltaic thermal components is stored as a source of chilled water and ice slurry water, so that the lack of chilled water can be supplemented by the cold storage device or ice slurry water can be supplied to the terminal by the ice storage device. This can meet the different needs of users, achieve peak regulation, ensure supply and demand matching, effectively ensure system stability and reduce the operating cost of cooling, greatly improve the energy utilization rate of the photovoltaic thermal components, and solve the problem of mismatch between supply and demand and large fluctuation in cooling and heating output when utilizing the waste heat of the photovoltaic components.

[0107] The chiller 40 supplies chilled water to the terminal 70 under the driving heat source provided by the phase change heat storage device 30, including: opening the sixth valve 41 so that the phase change heat storage device 30 provides the chiller 40 with a driving heat source to drive the chiller 40 to operate; opening the seventh valve 71, the tenth valve 74, the first circulation pump 91 and the eleventh valve 75 so that the water supply pipeline and the return pipeline between the chiller 40 and the terminal 70 are connected. In this way, the chiller 40 can operate and output chilled water.

[0108] The ice storage device 60 is stored with ice, including: starting the refrigeration compressor 61 in the ice storage device 60, opening the ninth valve 73 and the thirteenth valve 77 so that the chiller 40 delivers refrigerated water to the ice storage device 60, and closing the eighth valve 72, the twelfth valve 76, the fourteenth valve 78, the fifteenth valve 79 and the second circulation pump 92. Thus, ice storage can be achieved.

[0109] The cold storage device 50 is stored cold by the chiller 40, including: opening the eighth valve 72 and the twelfth valve 76, and controlling the fourteenth valve 78, the fifteenth valve 79, the second circulation pump 92, the ninth valve 73, and the thirteenth valve 77 to remain closed. Thus, cold storage can be performed by the chilled water output by the chiller 40.

[0110] The cold storage device 50 is used to supply chilled water to the terminal 70 to make up for the lack of cold, including: opening the eighth valve 72, the fourteenth valve 78, the fifteenth valve 79 and the second circulation pump 92, and closing the twelfth valve 76, the ninth valve 73 and the thirteenth valve 77. Thus, the cold storage device 50 can supply chilled water to the user.

[0111] In the ice slurry water mode, the ice storage device 60 is used to supply ice slurry water to the terminal 70, including: the chiller 40 is not running, the sixth valve 41, the eighth valve 72, the fourteenth valve 78, the fifteenth valve 79, the eleventh valve 75, the twelfth valve 76 and the second circulation pump 92 are closed; the ninth valve 73 and the seventh valve 71 are opened to allow the ice storage device 60 to supply ice slurry water to the terminal 70; the tenth valve 74, the first circulation pump 91 and the thirteenth valve 77 are opened to allow the return water of the terminal 70 to return to the ice storage device 60; when the ice slurry water in the ice storage device 60 is insufficient, the refrigeration compressor 61 in the ice storage device 60 is started. In this way, ice slurry water can be supplied to the user through the ice storage device 60.

[0112] Before utilizing the heat of the photovoltaic thermal component 10 to store heat in the phase change thermal storage device 30, it also includes: detecting the temperature of the photovoltaic thermal component 10; if the temperature of the photovoltaic thermal component 10 is greater than the temperature threshold, opening the first valve 12 to allow the water flowing out of the heat exchange channel to enter the buffer water tank 80; detecting the water temperature in the buffer water tank 80; if the water temperature in the buffer water tank 80 is greater than or equal to the first preset temperature, opening the second valve 21, the third valve 22 and the water pump 24 to transport hot water from the buffer water tank 80 to the domestic hot water tank 20; if the water temperature in the buffer water tank 80 is greater than or equal to the second preset temperature and less than the first preset temperature, and the amount of water in the buffer water tank 80 is greater than or equal to the preset water amount, opening the first heating device 81 of the buffer water tank 80; if the water temperature in the buffer water tank 80 is less than the second preset temperature, closing the second valve 21, the third valve 22 and the water pump 24.

[0113] Among them, the temperature of the photovoltaic thermal assembly 10 is greater than the temperature threshold, indicating that the power generation efficiency of the photovoltaic thermal assembly 10 is significantly affected, and the photovoltaic thermal assembly 10 needs to be cooled. The temperature threshold can be set according to actual conditions, and the temperature threshold is greater than the optimal operating temperature of the photovoltaic thermal assembly 10. The first preset temperature is greater than the second preset temperature, and both the first preset temperature and the second preset temperature can be set according to actual conditions. For example, the first preset temperature is 70°C and the second preset temperature is 50°C. The preset water volume can be set to half the capacity of the buffer water tank.

[0114] In this embodiment, when the water temperature in the buffer water tank 80 does not reach the first preset temperature, the first heating device 81 is started to heat the water in the buffer water tank 80, thereby ensuring the demand for hot water supply to the user.

[0115] The water flowing out of the heat exchange channel enters the buffer water tank 80, including: turning on the second heating device 83 to heat the water flowing out of the heat exchange channel, and then sending it to the buffer water tank 80. In this embodiment, the low-grade hot water generated by the photovoltaic thermal assembly 10 can be converted into high-grade hot water by the second heating device 83, and then heated by the buffer water tank 80, thereby ensuring that the user's hot water demand is met to the greatest extent.

[0116] The heat of the photovoltaic thermal assembly 10 is used to store heat in the phase change thermal storage device 30, including: opening the fourth valve 33 and the fifth valve 34 to send the water in the buffer water tank 80 into the phase change thermal storage device 30 for phase change thermal storage. In this way, the heat of the photovoltaic thermal assembly can be used to store heat smoothly, realizing full utilization of energy.

[0117] Example 3

[0118] This embodiment combines Figure 3 and Figure 6The above energy supply system and energy supply control method are described. However, it is worth noting that this specific embodiment is only for better illustrating the present application and does not constitute an improper limitation on the present application. The explanation of terms that are the same or corresponding to the above embodiment will not be repeated in this embodiment.

[0119] When the energy supply system is working, the photovoltaic cells in the photovoltaic thermal assembly 10 generate electricity under the influence of solar radiation. The generated electricity can supply power to the entire system and can also be used by users.

[0120] The temperature of the photovoltaic thermal component 10 is detected. When its temperature is too high and affects the power generation efficiency, the first valve 12 is automatically opened, and low-temperature water flows through the photovoltaic thermal component 10 to take away its heat. The water that takes away the heat flows into the second heating device 83 for heating and is converted into high-quality energy. The heated hot water is then sent to the buffer water tank 80. When the water temperature in the buffer water tank 80 is greater than or equal to 70°C, the water pump 24, the second valve 21 and the third valve 22 are automatically opened to send the hot water into the domestic hot water tank 20, so that the heat can be used for domestic hot water heating; if the water temperature in the buffer water tank 80 is less than 50°C, the water pump 24, the second valve 21 and the third valve 22 are closed; if the water temperature in the buffer water tank 80 is greater than or equal to 50°C and less than 70°C and the amount of water in the buffer water tank 80 is greater than half of the volume, the first heating device 81 is automatically opened to heat the water in the buffer water tank 80 to 70°C.

[0121] At the same time, when it is detected that the water temperature in the domestic hot water tank 20 reaches the set temperature, the fourth valve 33 and the fifth valve 34 are automatically opened to input the hot water in the buffer tank 80 into the phase change heat storage device 30, and phase change heat storage is performed through the collector side coil 31.

[0122] In addition to the above-mentioned function of supplying domestic hot water, the energy supply system can also supply chilled water and ice slurry water. Users can choose to supply chilled water or ice slurry water according to their own needs. The multi-operating mode provides users with more choices.

[0123] In the first energy supply mode (i.e., supplying chilled water), the sixth valve 41 is opened so that the phase change thermal storage device 30 provides a driving heat source for the chiller 40, driving the chiller 40 to operate, and the seventh valve 71, the tenth valve 74, the first circulation pump 91 and the eleventh valve 75 are opened so that the supply and return water pipelines between the chiller 40 and the terminal 70 are connected, so that the chiller 40 operates under the driving heat source provided by the phase change thermal storage device 30 and can supply chilled water to the terminal 70. At this time, the other valves on the heating side and the second circulation pump 92 are all in a closed state.

[0124] If the ice storage device 60 needs to store ice, start the refrigeration compressor 61 in the ice storage device 60, open the ninth valve 73 and the thirteenth valve 77, and store ice with the chilled water output by the chiller 40 to form ice slurry water, which will be supplied to the terminal 70 when the user needs ice slurry water later.

[0125] After ice storage is completed, the ninth valve 73 and the thirteenth valve 77 are closed. If the cold output of the chiller 40 has excess cold in addition to supplying the terminal and storing ice, if the cold storage device 50 needs to store cold, the eighth valve 72 and the twelfth valve 76 are opened, and the fourteenth valve 78, the fifteenth valve 79 and the second circulation pump 92 remain closed, so that the chilled water output by the chiller 40 can be used to store cold, so as to be used to supplement the cold for the terminal when the chiller output is insufficient. In this case, the chilled water returned from the terminal 70 through the water collector 2 is treated by the filter 3 and the stored cold water released by the cold storage device 50 is merged at the intersection between the tenth valve 74 and the twelfth valve 76, and then returns to the evaporator side of the chiller 40 through the eleventh valve 75 under the action of the first circulation pump 91. The chilled water after cooling is output from the chiller 40, a part of which is supplied to the terminal 70 through the seventh valve 71, and the other part is supplied to the cold storage device 50 through the eighth valve 72 for cold storage.

[0126] When the cold storage device 50 is needed to supply cold to the terminal 70 to make up for the lack of cold, the eighth valve 72, the fourteenth valve 78, the fifteenth valve 79 and the second circulation pump 92 are opened, and the twelfth valve 76 is closed. At this time, the ninth valve 73 and the thirteenth valve 77 remain closed, so that chilled water can be supplied to the user through the cold storage device 50.

[0127] In the second energy supply mode (i.e., supplying ice slurry water), the chiller 40 does not operate, the sixth valve 41, the eighth valve 72, the fourteenth valve 78, the fifteenth valve 79, the eleventh valve 75, the twelfth valve 76 and the second circulation pump 92 are closed; the ninth valve 73 and the seventh valve 71 are opened to allow the ice storage device 60 to supply ice slurry water to the terminal 70; the tenth valve 74, the first circulation pump 91 and the thirteenth valve 77 are opened to allow the return water of the terminal 70 to return to the ice storage device 60. In this way, ice slurry water can be supplied to the user through the ice storage device 60. When the ice slurry water in the ice storage device is insufficient, the refrigeration compressor 61 in the ice storage device 60 is started. In this case, the refrigeration compressor 61 and the cooling fan of the condenser 62 in the ice storage device 60 will consume part of the electricity generated by the photovoltaic power generation, and drive the compressed and condensed liquid refrigerant to the throttling element 63 for throttling, and then enter the refrigeration evaporation coil of the refrigeration evaporator 64. The chilled water return from the terminal 70 is treated by the filter 3 and then returned to the refrigeration evaporator 64 side of the ice storage device 60 under the action of the first circulation pump 91 for cooling to obtain ice slurry water, which continues to be supplied to the terminal 70.

[0128] refer to Figure 6 , the energy supply control process includes the following steps:

[0129] S601, using the heat of the photovoltaic thermal assembly 10 to obtain hot water.

[0130] S602, determine whether the water temperature in the buffer water tank 80 is greater than or equal to 70°C, if so, proceed to S603, if not, proceed to S604.

[0131] S603, sending the hot water in the buffer water tank 80 to the domestic hot water tank 20.

[0132] S604, using the first heating device 81 to heat the water in the buffer water tank 80, and when the temperature reaches 70°C, the water is sent to the domestic hot water tank 20.

[0133] S605, after the domestic hot water demand is met, the hot water is sent to the phase change heat storage device 30.

[0134] S606 , utilizing the heat stored in the phase change heat storage device 30 as a driving heat source for the chiller 40 to operate the chiller 40 .

[0135] S607, determine whether the output cooling capacity of the chiller 40 is greater than the terminal cooling capacity required, if so, proceed to S608, if not, proceed to S609.

[0136] S608, the chiller 40 directly supplies chilled water to the terminal 70, and the excess cooling capacity can be used for ice storage. After the ice storage is completed, the excess cooling capacity is stored for cold storage.

[0137] S609, the chiller 40 supplies chilled water to the terminal 70, and the insufficient cooling capacity is supplemented by the cold storage device 50.

[0138] S610: The ice storage device 60 stores ice.

[0139] This embodiment proposes a multi-operating-condition energy supply system based on photovoltaic thermal energy, which can be used for a long time. The system can effectively reduce the working temperature of photovoltaic thermal energy components and improve the power generation efficiency of photovoltaic thermal energy components. By utilizing the waste heat resources of photovoltaic thermal energy components, waste can be turned into treasure. The second heating device is used to increase the low-grade waste heat. The cold storage device is used as an emergency cold source for the cooling system, providing the system with a redundant design of cold water source. The ice storage device is used as the source of ice slurry for the system, providing the system with ice slurry water, meeting the user's demand for sub-zero temperature load, and effectively ensuring the user's diversified choice of heat load and cold load. It greatly improves the solar energy utilization efficiency of existing photovoltaic thermal energy components, improves the comprehensive utilization efficiency of solar energy, and has a wide range of application scenarios in photovoltaic power generation scenarios with abundant waste heat resources. This embodiment uses ice storage and / or cold storage to store the waste heat of photovoltaic thermal energy components. Relying on the redundant design of cold sources and heat sources, different energy supply modes can be reasonably enabled for different situations to ensure the stability of the cooling and heating systems and reduce the operating costs of diversified energy supply systems.

[0140] Example 4

[0141] This embodiment provides a non-volatile computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described in the above embodiment are implemented.

[0142] Example 5

[0143] This embodiment provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method described in the above embodiment when executing the computer program.

[0144] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0145] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy supply system, characterized in that: include: Photovoltaic thermal components are provided with heat exchange channels; A domestic hot water tank is connected in series with the heat exchange channel to form a circulation; A phase-change heat storage device, connected in parallel with the domestic hot water tank and forming a cycle with the heat exchange channel; A chiller connected to the phase-change heat storage device, wherein the phase-change heat storage device provides a driving heat source for the chiller; A cold storage device connected to the chiller; An ice storage device connected to the chiller; The ends are respectively connected to the chiller, the cold storage device and the ice storage device.

2. The energy supply system according to claim 1, characterized in that: The energy supply system further comprises: A buffer water tank connected between the outlet of the heat exchange channel and the inlet of the domestic hot water tank; The first heating device is installed in the buffer water tank and is used to heat the water in the buffer water tank so as to transport hot water from the buffer water tank to the domestic hot water tank when the water temperature in the buffer water tank reaches a first preset temperature.

3. The energy supply system according to claim 2, characterized in that: The energy supply system further includes: a second heating device connected between the outlet of the heat exchange channel and the inlet of the buffer water tank, and used for heating water flowing out of the heat exchange channel.

4. The energy supply system according to claim 1, characterized in that: A first valve is arranged at the outlet of the heat exchange channel, a second valve is arranged at the inlet of the domestic hot water tank, a third valve is arranged at the outlet of the domestic hot water tank, and a water pump is arranged in the circulation loop formed by the domestic hot water tank and the heat exchange channel and in the circulation loop formed by the phase change heat storage device and the heat exchange channel.

5. The energy supply system according to claim 1, characterized in that: The phase change heat storage device comprises: a heat collection side coil and a heating side coil; The heat collecting side coil is connected in parallel with the domestic hot water tank, a fourth valve is provided at the inlet of the heat collecting side coil, and a fifth valve is provided at the outlet of the heat collecting side coil; The heating side coil is connected to the absorber in the chiller to form a circulation, and a sixth valve is arranged on the connecting pipeline between the outlet of the heating side coil and the inlet of the absorber. The chiller is a hot water type lithium bromide chiller.

6. The energy supply system according to claim 1, characterized in that: The chiller comprises: a chilled water supply port connected to the water inlet of the end through a seventh valve, connected to the first port of the cold storage device through an eighth valve, and also connected to the first port of the ice storage device through a ninth valve; A chilled water return port is connected to the water outlet of the end through a first pipeline, and a tenth valve, a first circulation pump and an eleventh valve are sequentially arranged on the first pipeline along the return direction; The second port of the cold storage device is connected between the tenth valve and the first circulation pump through the twelfth valve; The second port of the ice storage device is connected between the first circulation pump and the eleventh valve through a thirteenth valve.

7. The energy supply system according to claim 6, characterized in that: The second port of the cold storage device is also connected to the water return port at the end through the fourteenth valve, the second circulation pump and the fifteenth valve in sequence.

8. The energy supply system according to claim 1, characterized in that: The ice storage device includes: a refrigeration compressor, a condenser, a throttling element and a refrigeration evaporator which are connected in a cycle in sequence. The refrigeration evaporator is provided with a refrigeration evaporation coil for circulating the refrigerant. The refrigeration evaporator is provided with a first port and a second port for forming a cycle with the chiller and the terminal.

9. A method for controlling energy supply, characterized in that: Applied to the energy supply system according to any one of claims 1 to 8, the method comprising: When the water temperature in the domestic hot water tank is greater than or equal to the set temperature, the heat of the photovoltaic thermal component is used to store heat in the phase change thermal storage device; In the chilled water mode, the chiller supplies chilled water to the terminal and stores ice in the ice storage device under the driving heat source provided by the phase change heat storage device. If the output cooling capacity of the chiller is greater than the sum of the cooling capacity required by the terminal and the cooling capacity required by the ice storage device, the cooling storage device is stored with the chiller. If the output cooling capacity of the chiller is less than the cooling capacity required by the terminal, the cooling storage device is used to supply chilled water to the terminal to make up for the lack of cooling capacity. In the ice slurry water mode, the ice storage device is used to supply ice slurry water to the end.

10. The method according to claim 9, characterized in that The chiller supplies chilled water to the terminal under the driving heat source provided by the phase change heat storage device, including: Opening the sixth valve to allow the phase-change heat storage device to provide a driving heat source for the chiller to drive the chiller to operate; The seventh valve, the tenth valve, the first circulation pump and the eleventh valve are opened to connect the water supply pipeline and the water return pipeline between the chiller and the terminal.

11. The method according to claim 9, characterized in that Storing ice in an ice storage device includes: The refrigeration compressor in the ice storage device is started, and the ninth valve and the thirteenth valve are opened to allow the chiller to deliver refrigerated water to the ice storage device.

12. The method according to claim 9, characterized in that The cold storage device is stored cold by the chiller, comprising: Open the eighth valve and the twelfth valve, and control the fourteenth valve, the fifteenth valve, the second circulation pump, the ninth valve and the thirteenth valve to remain closed.

13. The method according to claim 9, characterized in that Utilizing the cold storage device to supply chilled water to the terminal to make up for the lack of cold capacity, including: Open the eighth valve, the fourteenth valve, the fifteenth valve and the second circulation pump, and close the twelfth valve, the ninth valve and the thirteenth valve.

14. The method according to claim 9, characterized in that In the ice slurry water mode, the ice slurry water is supplied to the terminal by using the ice storage device, including: The chiller is not running, and the sixth valve, the eighth valve, the fourteenth valve, the fifteenth valve, the eleventh valve, the twelfth valve and the second circulation pump are closed; Open the ninth valve and the seventh valve to allow the ice storage device to supply ice slurry water to the end; Opening the tenth valve, the first circulation pump and the thirteenth valve to allow the return water at the end to return to the ice storage device; When the ice slurry water in the ice storage device is insufficient, the refrigeration compressor in the ice storage device is started.

15. The method according to any one of claims 9 to 14, characterized in that Before utilizing the heat of the photovoltaic thermal assembly to store heat in the phase change thermal storage device, the method further includes: Detecting the temperature of the photovoltaic thermal assembly; If the temperature of the photovoltaic thermal assembly is greater than the temperature threshold, the first valve is opened to allow water flowing out of the heat exchange channel to enter the buffer water tank; Detecting the water temperature in the buffer water tank; If the water temperature in the buffer water tank is greater than or equal to the first preset temperature, the second valve, the third valve and the water pump are opened to transport hot water from the buffer water tank to the domestic hot water tank; If the water temperature in the buffer water tank is greater than or equal to the second preset temperature and less than the first preset temperature, and the water volume in the buffer water tank is greater than or equal to the preset water volume, turning on the first heating device of the buffer water tank; If the water temperature in the buffer water tank is lower than the second preset temperature, the second valve, the third valve and the water pump are closed.

16. The method according to claim 15, characterized in that The water flowing out of the heat exchange channel enters the buffer water tank, including: The second heating device is turned on to heat the water flowing out of the heat exchange channel and then sent to the buffer water tank.

17. The method according to any one of claims 9 to 14, characterized in that The heat of the photovoltaic thermal component is used to store heat in the phase change thermal storage device, including: The fourth valve and the fifth valve are opened to send the water in the buffer water tank into the phase change heat storage device for phase change heat storage.

18. A non-volatile computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 9 to 17 are implemented.

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