Methods, systems, and storage media for estimating the area of ​​parabolic trough solar collector fields

Abstract

This invention provides a method, system, and storage medium for estimating the area of ​​a parabolic trough solar collector field. The method includes: obtaining the collector model and parameters used in the parabolic trough solar thermal field; obtaining the changes in solar irradiance and incident angle at the location of the parabolic trough solar thermal field to determine the solar irradiance received by the mirrors of the parabolic trough collector; obtaining the optical efficiency of the parabolic trough collector to determine the solar irradiance absorbed by the absorber tubes; obtaining the thermal conversion efficiency and operating time of the parabolic trough collector to determine the solar irradiance absorbed by the heat transfer medium flowing through a unit length of absorber tubes; determining the single-loop length of the collector field based on the temperature of the compressed heat transfer medium and the expansion heat temperature, combined with the collector field parameters of the parabolic trough solar thermal power plant; calculating the design flow rate of the single loop of the collector field based on the optimal solar irradiance value; calculating the flow rate of the single loop and the total number of loops during the operating time based on the total amount of compressed heat transfer medium to be heated; and calculating the total area of ​​the collector field. This invention solves the problems of poor flexibility and high complexity in existing solar thermal compressed air energy storage systems.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to a method, system and storage medium for estimating the area of ​​a parabolic trough solar collector field. Background Technology

[0002] Among large-scale physical energy storage technologies, non-combustion compressed air (NCA) energy storage technology has become one of the main ways to achieve the "dual carbon" goal due to its advantages such as cleanliness, high efficiency, long operating cycle, and low site requirements. The biggest feature of NCA is that by introducing a heat exchange system, it can recover the heat of compression during energy storage and use it in the energy release process to improve system efficiency. Although it has successfully moved towards commercial operation, NCA still has room for expansion in terms of absorbing renewable energy and improving its own efficiency. This is mainly due to the introduction of a heat exchange system, which provides more energy flow interfaces. For example, by introducing solar thermal energy, the heat of compression can be significantly improved, compressor power consumption reduced, and solar energy absorption promoted. Therefore, solar thermal combined compressed air energy storage technology has become one of the current hot technologies in this field. Among various solar thermal collection technologies, parabolic trough solar thermal collection technology is the preferred choice for integration with NCA due to its high degree of commercialization and the high degree of matching between the operating temperature range of the heat transfer medium and the heat of compression.

[0003] Although it can further promote the absorption of solar energy and improve system efficiency, there are still some factors that restrict the further development of parabolic trough solar thermal combined compressed air energy storage systems. On the parabolic trough solar thermal side, there are the following main problems. First, the technologies used in mature and commercially operating parabolic trough solar thermal power plants cannot be directly copied. For example, in typical commercial power plants, the collector field and inlet / outlet parameters are basically fixed. Each loop in the collector field is 600 m long (usually composed of four 150 m long collector units connected in series), and the inlet and outlet temperatures of the heat transfer medium are 293℃ and 393℃, respectively. Since the scale, operating time, and compression heat temperature of non-combustion compressed air energy storage will vary flexibly according to the application scenario, the collector field parameters should also be changed accordingly. Furthermore, the model of a parabolic trough solar collector involves optics and various heat exchange processes, making calculations complex. Adjusting the collector field parameters based on this model would incur significant computational costs. Finally, because solar irradiance is constantly changing, the parabolic trough solar collector field is almost always operating outside of its design conditions. The parabolic trough collector field must heat all the working medium from the compression heat temperature to the expansion heat operating temperature within a full operating cycle, which further increases the design difficulty of the collector field parameters. Summary of the Invention

[0004] This invention provides a method, system, and storage medium for estimating the area of ​​a parabolic trough solar collector field, in order to solve the problems of poor flexibility and high complexity of existing parabolic trough solar thermal combined compressed air energy storage systems.

[0005] This invention provides a method for estimating the area of ​​a trough-type solar collector field, comprising:

[0006] Obtain the model and parameters of the solar collectors used in the trough solar collector application;

[0007] Obtain the solar irradiance and incident angle variation at the location of the parabolic trough collector field, and determine the solar irradiance received by the mirror surface of the parabolic trough collector per unit length;

[0008] Obtain the optical efficiency of the parabolic trough collector, determine the solar irradiance absorbed per unit length of the absorber tube, obtain the thermal conversion efficiency and operating time of the parabolic trough collector, and determine the solar irradiance absorbed by the heat transfer medium flowing through the absorber tube per unit length.

[0009] Based on the given temperature of the compressible heat medium and the temperature of the expansion heat, and combined with the parameters of the collector field of the trough solar thermal power plant, the single loop length of the collector field is determined.

[0010] Calculate the design flow rate of a single loop in the collector field based on the optimal solar irradiance value. Based on the given total amount of compressed heat medium to be heated, determine the flow rate of a single loop and the total number of loops required during the operating time.

[0011] The total area of ​​the solar collector field is calculated based on the design flow rate of a single loop, the flow rate of a single loop, and the required total number of loops.

[0012] According to the present invention, a method for estimating the area of ​​a trough solar collector field, wherein obtaining the changes in solar irradiance and incident angle at the location of the trough solar collector field, and determining the solar irradiance received per unit length of the trough collector mirror, specifically includes:

[0013] The solar radiation received by the mirror surface of the unit length trough solar collector The calculation method is as follows:

[0014]

[0015] In the formula, Solar normal direct irradiance, W / m 2 ; The width of the trough-type solar collector opening is in meters. Angle of incidence o ; The incident angle correction factor is The function.

[0016] According to the present invention, a method for estimating the area of ​​a parabolic trough solar collector field includes obtaining the optical efficiency of the parabolic trough collector, determining the solar irradiance absorbed per unit length of the absorber tube, obtaining the thermal conversion efficiency and operating time of the parabolic trough collector, and determining the solar irradiance absorbed by the heat transfer medium flowing through the absorber tube per unit length. Specifically, this includes:

[0017] optical efficiency The calculation method is as follows:

[0018]

[0019] In the formula, For parabolic trough collectors, Let be the reflectivity of the parabolic mirror. The transmittance of the glass light-transmitting tube. The absorptivity of the heat absorber surface;

[0020] The solar radiation absorbed by the heat absorber per unit length The calculation method is as follows:

[0021]

[0022] thermal conversion efficiency The calculation method is as follows:

[0023]

[0024] In the formula, the function The value can be obtained by fitting experimental data;

[0025] The amount of solar radiation absorbed by the heat transfer medium per unit length of the heat absorber tube The calculation method is as follows:

[0026] .

[0027] According to the present invention, a method for estimating the area of ​​a parabolic trough solar collector field includes determining the single-loop length of the collector field based on given compressible heat transfer fluid temperature and expansion heat temperature, combined with the collector field parameters of the parabolic trough solar thermal power plant. Specifically, this method includes:

[0028] The single-loop length of the trough-type solar collector The calculation method is as follows:

[0029]

[0030] In the formula and These are the design temperatures of the heat transfer medium for the heat of compression and expansion in a non-combustion compressed air energy storage system combined with a trough-type heat collector; This refers to the single-loop temperature rise gradient determined based on the heat collection site in a commercial parabolic trough solar thermal power plant.

[0031] According to the present invention, a method for estimating the area of ​​a trough-type solar collector field is provided. This method calculates the design flow rate of a single loop in the collector field based on the optimal solar irradiance value, and determines the flow rate of a single loop and the required total number of loops during operation based on a given total amount of compressed heat medium to be heated. Specifically, the method includes:

[0032] The single-loop design flow rate of the trough-type solar collector The calculation method is as follows:

[0033]

[0034] In the formula The maximum solar irradiance that the heat transfer medium can absorb when flowing through a unit length of heat absorber tube, in W / m; Let be the specific enthalpy of the heat transfer medium, and be a single-valued function of the temperature of the heat transfer medium, in J / kg.

[0035] The total number of loops in the trough-type solar collector field The calculation method is as follows:

[0036]

[0037] In the formula The total mass of the working fluid to be heated in a non-combustion compressed air energy storage system, in kg; The runtime is in seconds. The total operating time of the trough-type solar collector is in seconds. Let be the time step, in seconds; For any The mass flow rate of a single loop at any given time, in kg / s, will Substitute for any time interval It can then be obtained.

[0038] According to the present invention, a method for estimating the area of ​​a trough-type solar collector field is provided, which calculates the total area of ​​the collector field based on the design flow rate of a single loop, the flow rate of a single loop, and the required total number of loops. Specifically, the method includes:

[0039] The total area of ​​the trough-type heat collection field The calculation method is as follows:

[0040] .

[0041] This invention also discloses a system for estimating the area of ​​a trough-type solar collector field, the system comprising:

[0042] The data acquisition module is used to acquire the model and parameters of the solar collectors used in trough solar collector applications;

[0043] The first solar irradiance determination module is used to obtain the solar irradiance and incident angle changes at the location of the trough collector field, and to determine the solar irradiance received by the mirror of the trough collector per unit length.

[0044] The second solar irradiance determination module is used to obtain the optical efficiency of the trough collector, determine the solar irradiance absorbed by the absorber tube per unit length, obtain the thermal conversion efficiency and operating time of the trough collector, and determine the solar irradiance absorbed by the heat transfer medium flowing through the absorber tube per unit length.

[0045] The single-loop length determination module for the collector field is used to determine the single-loop length of the collector field based on the given temperature of the compressed heat working fluid and the temperature of the expansion heat, combined with the collector field parameters of the parabolic trough solar thermal power plant.

[0046] The flow calculation module is used to calculate the design flow rate of a single loop in the collector field based on the optimal solar irradiance value, and to calculate the flow rate of a single loop and the total number of loops required during the operating time based on the given total amount of compressed heat medium to be heated.

[0047] The total area calculation module of the solar collector field is used to calculate the total area of ​​the solar collector field based on the design flow rate of a single loop, the flow rate of a single loop, and the required total number of loops.

[0048] The present invention also 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 executes the program to implement the above-described method for estimating the area of ​​a parabolic trough solar collector field.

[0049] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for estimating the area of ​​a trough solar collector field as described above.

[0050] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method for estimating the area of ​​a trough-type solar collector field.

[0051] This invention provides a method, system, and storage medium for estimating the area of ​​a parabolic trough solar collector field. This promotes the integration and coupling between parabolic trough solar collector technology and non-combustion compressed air energy storage technology. By introducing the parameter of thermal conversion efficiency, the main parameters of the parabolic trough solar collector field can be designed quickly and conveniently based on the parameter requirements of compression heat and expansion heat of non-combustion compressed air energy storage. In addition to the area, this invention also includes methods for calculating important parameters such as the single-loop flow rate of the collector field and the optimal operating flow rate under varying solar irradiance. Furthermore, the parameters obtained in this invention can provide important support for calculating the investment and operation and maintenance costs, pump power consumption, and operation strategy of the parabolic trough solar collector field. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0053] Figure 1 This is a flowchart illustrating a method for estimating the area of ​​a trough-type solar collector field provided by the present invention;

[0054] Figure 2 This invention provides and A diagram illustrating the relationships between them;

[0055] Figure 3 This is a schematic diagram of the module connection of a trough-type solar collector area estimation system provided by the present invention;

[0056] Figure 4 This is a schematic diagram of the structure of the electronic device provided by the present invention.

[0057] Figure label:

[0058] 110: Data acquisition module; 120: First solar irradiance determination module; 130: Second solar irradiance determination module; 140: Single loop length determination module for collector field; 150: Flow rate calculation module; 160: Total area calculation module for collector field;

[0059] 710: Processor; 720: Communication interface; 730: Memory; 740: Communication bus. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0061] The following is combined with Figure 1 A method for estimating the area of ​​a trough-type solar collector field according to the present invention includes:

[0062] S100. Obtain the model and parameters of the solar collector used in the trough solar collector application;

[0063] S200. Obtain the solar irradiance and incident angle variation at the location of the trough collector field, and determine the solar irradiance received by the mirror of the trough collector per unit length.

[0064] S300. Obtain the optical efficiency of the parabolic trough collector, determine the solar irradiance absorbed per unit length of the absorber tube, obtain the thermal conversion efficiency and operating time of the parabolic trough collector, and determine the solar irradiance absorbed by the heat transfer medium flowing through the absorber tube per unit length.

[0065] S400. Based on the given temperature of the compressed heat working fluid and the temperature of the expansion heat, and in combination with the parameters of the collector field of the trough solar thermal power plant, determine the single loop length of the collector field.

[0066] S500: Calculate the design flow rate of a single loop in the collector field based on the optimal solar irradiance value. Based on the given total amount of compressed heat medium to be heated, calculate the flow rate of a single loop and the total number of loops required during the operating time.

[0067] S600. Calculate the total area of ​​the heat collection field based on the design flow rate of a single loop, the flow rate of a single loop, and the required total number of loops.

[0068] This invention, by introducing the parameter of thermal conversion efficiency, enables the rapid and convenient design of the main parameters of a parabolic trough solar collector field based on the parameter requirements of compression heat and expansion heat in non-combustion compressed air energy storage. In addition to the area, this invention also includes methods for calculating important parameters such as the single-loop flow rate of the collector field and the optimal operating flow rate under varying solar irradiance. Furthermore, the parameters obtained in this invention can provide important support for calculating the investment and operation and maintenance costs, pump power consumption, and operation strategy of parabolic trough solar collector fields.

[0069] To obtain the changes in solar irradiance and incident angle at the location of the trough solar collector, and to determine the solar irradiance received by the mirror surface of the trough solar collector per unit length, specifically including:

[0070] The solar radiation received by the mirror surface of the unit length trough solar collector The calculation method is as follows:

[0071] (1)

[0072] In the formula, Solar normal direct irradiance, W / m 2 ; The width of the trough-type solar collector opening is in meters. Angle of incidence o ; The incident angle correction factor is The function.

[0073] To obtain the optical efficiency of the parabolic trough collector, determine the solar irradiance absorbed per unit length of the absorber tube, obtain the thermal conversion efficiency and operating time of the parabolic trough collector, and determine the solar irradiance absorbed by the heat transfer medium flowing through a unit length of the absorber tube, specifically including:

[0074] optical efficiency The calculation method is as follows:

[0075] (2)

[0076] In the formula, For parabolic trough collectors, Let be the reflectivity of the parabolic mirror. The transmittance of the glass light-transmitting tube. The absorptivity of the heat absorber surface;

[0077] The solar radiation absorbed by the heat absorber per unit length The calculation method is as follows:

[0078] (3)

[0079] thermal conversion efficiency The calculation method is as follows:

[0080] (4)

[0081] In the formula, the function The value can be obtained by fitting experimental data;

[0082] The amount of solar radiation absorbed by the heat transfer medium per unit length of the heat absorber tube The calculation method is as follows:

[0083] (5)

[0084] Based on the given temperature of the compressible heat transfer fluid and the temperature of its expansion, and combined with the parameters of the parabolic trough solar thermal power plant's collector field, the single-loop length of the collector field is determined, specifically including:

[0085] The single-loop length of the trough-type solar collector The calculation method is as follows:

[0086] (6)

[0087] In the formula and These are the design temperatures of the heat transfer medium for the heat of compression and expansion in a non-combustion compressed air energy storage system combined with a trough-type heat collector; This refers to the single-loop temperature rise gradient determined based on the heat collection site in a commercial parabolic trough solar thermal power plant.

[0088] Calculate the design flow rate of a single loop in the solar collector field based on the optimal solar irradiance value. Given the total amount of compressed heat medium to be heated, determine the flow rate of a single loop during operation and the required total number of loops. Specifically, this includes:

[0089] The single-loop design flow rate of the trough-type solar collector The calculation method is as follows:

[0090] (7)

[0091] In the formula The maximum solar irradiance that the heat transfer medium can absorb when flowing through a unit length of heat absorber tube, in W / m; Let be the specific enthalpy of the heat transfer medium, and be a single-valued function of the temperature of the heat transfer medium, in J / kg.

[0092] The total number of loops in the trough-type solar collector field The calculation method is as follows:

[0093] (8)

[0094] In the formula The total mass of the working fluid to be heated in a non-combustion compressed air energy storage system, in kg; The runtime is in seconds. The total operating time of the trough-type solar collector is in seconds. Let be the time step, in seconds; For any The mass flow rate of a single loop at any given time, in kg / s, will Substitute for any time interval It can then be obtained.

[0095] The total area of ​​the solar collector field is calculated based on the design flow rate of a single loop, the flow rate of a single loop, and the required total number of loops. Specifically, this includes:

[0096] The total area of ​​the trough-type heat collection field The calculation method is as follows:

[0097] (9)

[0098] In one specific embodiment, a solar thermal combined compressed air energy storage system is constructed in Ulanqab City, Inner Mongolia. It is known that the system's heat exchange system uses Therminol VP-1 heat transfer oil, commonly used in industry, as the heat transfer medium. By recovering the heat of compression, a total of 288,000 kg of heat transfer oil at a temperature of 250°C can be obtained. However, the trough solar collector requires further heating of the heat transfer oil to 385°C. The area of ​​the trough solar collector can be calculated using the following steps:

[0099] Step 1: The parabolic trough solar collector mainly consists of a parabolic trough mirror and a collector. The parabolic trough mirror uses the most commonly used Euro-Trough series. This model of mirror has a cutoff factor of 0.9317, a reflectivity of 0.935, an opening width of 5.75 m, and the incident angle correction factor can be calculated by the following formula:

[0100] (9)

[0101] The solar collector uses the most commonly used Schott PTR70 series, which has a transmittance of 0.963 on the glass cover tube and an absorptivity of 0.95 on the surface of the absorber tube.

[0102] Step 2: According to the investigation, Ulanqab City is located at 41.0925°N and 113.07°E. According to meteorological data, the solar radiation resources are best on the vernal equinox among the four typical days of the year in this region. Therefore, the design of the trough solar collector field is based on the DNI of that day. Furthermore, according to Equation (1), the solar radiation received by the mirror of the trough solar collector per unit length can be obtained.

[0103] Step 3: Based on the optical parameters of the parabolic trough collector and according to equation (2), the optical efficiency of the parabolic trough collector can be obtained. The value is 0.7998; furthermore, according to equation (3), the solar radiation absorbed per unit length of the heat-absorbing tube can be calculated. .

[0104] Step four, according to Figure 2 Intermediate heat conversion efficiency Solar radiation absorbed per unit length of heat absorber tube The relationship between them can be obtained. Furthermore, according to equation (5), the solar radiation absorbed by the heat transfer medium flowing through a unit length of the heat absorber tube can be calculated. The maximum value It is 3355.8 W / m; further, take The time indicated is the operating time of the trough solar collector field, which can be determined to be 8:00-15:30.

[0105] Step 5: In a commercial power plant, the total length of a single loop in a trough-type collector field is 600 m, and the temperature rise is 100 ℃. The single-loop temperature rise gradient can be taken. for ℃ / m, further, based on the requirements for the compressive heat and expansion heat temperatures in this system and equation (6), the single-loop length of the trough-type heat collector field can be obtained. It is 810 m.

[0106] Step six, the relationship between the temperature and enthalpy of Therminol VP-1 heat transfer oil can be found as follows:

[0107] (10)

[0108] The design flow rate of a single loop in a trough-type solar collector can be obtained according to equation (7). It is 8.5 kg / s.

[0109] Step 7, in equation (7) Replace with time-varying According to equation (7), the operating cycle can be calculated. Furthermore, according to equation (8), the total number of loops in the trough-type collector field can be obtained. It is 11.

[0110] Step 8: According to equation (9), the total area of ​​the trough-type heat collector field can be obtained. 51233 m 2 。

[0111] The method for estimating the area of ​​a parabolic trough solar collector field provided by this invention promotes the integration and coupling between parabolic trough solar collector technology and non-combustion compressed air energy storage technology. By introducing the parameter of thermal conversion efficiency, the main parameters of the parabolic trough solar collector field can be designed quickly and conveniently based on the parameter requirements of compression heat and expansion heat of non-combustion compressed air energy storage. In addition to the area, this invention also includes methods for calculating important parameters such as the single-loop flow rate of the collector field and the optimal operating flow rate when solar irradiance varies. Furthermore, the parameters obtained in this invention can provide important support for calculating the investment and operation and maintenance costs, pump power consumption, and operation strategy of the parabolic trough solar collector field.

[0112] This invention also discloses a system for estimating the area of ​​a trough-type solar collector field, the system comprising:

[0113] The data acquisition module 110 is used to acquire the model and parameters of the solar collectors used in the trough solar collector application.

[0114] The first solar irradiance determination module 120 is used to obtain the solar irradiance and incident angle variation at the location of the trough collector field and determine the solar irradiance received by the mirror of the trough collector per unit length.

[0115] The second solar irradiance determination module 130 is used to obtain the optical efficiency of the trough collector, determine the solar irradiance absorbed by the heat absorber tube per unit length, obtain the thermal conversion efficiency and operating time of the trough collector, and determine the solar irradiance absorbed by the heat transfer medium flowing through the heat absorber tube per unit length.

[0116] The single-loop length determination module 140 for the collector field is used to determine the single-loop length of the collector field based on the given temperature of the compressible heat working fluid and the temperature of the expansion heat, combined with the collector field parameters of the parabolic trough solar thermal power plant.

[0117] The flow calculation module 150 is used to calculate the design flow rate of a single loop in the collector field based on the optimal solar irradiance value, and to calculate the flow rate of a single loop and the total number of loops required during the operating time based on the given total amount of compressed heat working fluid to be heated.

[0118] The total area calculation module 160 of the heat collection field is used to calculate the total area of ​​the heat collection field based on the design flow rate of a single loop, the flow rate of a single loop, and the required total number of loops.

[0119] The parabolic trough solar collector area estimation system provided by this invention promotes the integration and coupling between parabolic trough solar collector technology and non-combustion compressed air energy storage technology. By introducing the parameter of thermal conversion efficiency, the main parameters of the parabolic trough solar collector can be designed quickly and conveniently according to the parameter requirements of compression heat and expansion heat of non-combustion compressed air energy storage. In addition to area, this invention also includes calculation methods for important parameters such as single-loop flow rate of the collector and optimal operating flow rate under varying solar irradiance. Furthermore, the parameters obtained in this invention can provide important support for calculating investment and operation and maintenance costs, pump power consumption, and operation strategy formulation for parabolic trough solar collectors.

[0120] Figure 4 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 4 As shown, the electronic device may include a processor 710, a communication interface 720, a memory 730, and a communication bus 740, wherein the processor 710, the communication interface 720, and the memory 730 communicate with each other via the communication bus 740. The processor 710 can call logical instructions in the memory 730 to execute a method for estimating the area of ​​a parabolic trough solar collector field. This method includes: obtaining the collector model and parameters used in the parabolic trough solar collector field;

[0121] Obtain the solar irradiance and incident angle variation at the location of the parabolic trough collector field, and determine the solar irradiance received by the mirror surface of the parabolic trough collector per unit length;

[0122] Obtain the optical efficiency of the parabolic trough collector, determine the solar irradiance absorbed per unit length of the absorber tube, obtain the thermal conversion efficiency and operating time of the parabolic trough collector, and determine the solar irradiance absorbed by the heat transfer medium flowing through the absorber tube per unit length.

[0123] Based on the given temperature of the compressible heat medium and the temperature of the expansion heat, and combined with the parameters of the collector field of the trough solar thermal power plant, the single loop length of the collector field is determined.

[0124] Calculate the design flow rate of a single loop in the collector field based on the optimal solar irradiance value. Based on the given total amount of compressed heat medium to be heated, determine the flow rate of a single loop and the total number of loops required during the operating time.

[0125] The total area of ​​the solar collector field is calculated based on the design flow rate of a single loop, the flow rate of a single loop, and the required total number of loops.

[0126] Furthermore, the logical instructions in the aforementioned memory 730 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0127] On the other hand, the present invention also provides a computer program product, the computer program product including a computer program, the computer program being able to be stored on a non-transitory computer-readable storage medium, the computer program being executed by a processor, the computer being able to execute a method for estimating the area of ​​a parabolic trough solar collector field provided by the above methods, the method including: obtaining the collector model and parameters used in the parabolic trough solar collector field;

[0128] Obtain the solar irradiance and incident angle variation at the location of the parabolic trough collector field, and determine the solar irradiance received by the mirror surface of the parabolic trough collector per unit length;

[0129] Obtain the optical efficiency of the parabolic trough collector, determine the solar irradiance absorbed per unit length of the absorber tube, obtain the thermal conversion efficiency and operating time of the parabolic trough collector, and determine the solar irradiance absorbed by the heat transfer medium flowing through the absorber tube per unit length.

[0130] Based on the given temperature of the compressible heat medium and the temperature of the expansion heat, and combined with the parameters of the collector field of the trough solar thermal power plant, the single loop length of the collector field is determined.

[0131] Calculate the design flow rate of a single loop in the collector field based on the optimal solar irradiance value. Based on the given total amount of compressed heat medium to be heated, determine the flow rate of a single loop and the total number of loops required during the operating time.

[0132] The total area of ​​the solar collector field is calculated based on the design flow rate of a single loop, the flow rate of a single loop, and the required total number of loops.

[0133] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for estimating the area of ​​a parabolic trough solar collector field provided by the methods described above, the method comprising: obtaining the collector model and parameters used in the parabolic trough solar collector field;

[0134] Obtain the solar irradiance and incident angle variation at the location of the parabolic trough collector field, and determine the solar irradiance received by the mirror surface of the parabolic trough collector per unit length;

[0135] Obtain the optical efficiency of the parabolic trough collector, determine the solar irradiance absorbed per unit length of the absorber tube, obtain the thermal conversion efficiency and operating time of the parabolic trough collector, and determine the solar irradiance absorbed by the heat transfer medium flowing through the absorber tube per unit length.

[0136] Based on the given temperature of the compressible heat medium and the temperature of the expansion heat, and combined with the parameters of the collector field of the trough solar thermal power plant, the single loop length of the collector field is determined.

[0137] Calculate the design flow rate of a single loop in the collector field based on the optimal solar irradiance value. Based on the given total amount of compressed heat medium to be heated, determine the flow rate of a single loop and the total number of loops required during the operating time.

[0138] The total area of ​​the solar collector field is calculated based on the design flow rate of a single loop, the flow rate of a single loop, and the required total number of loops.

[0139] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0140] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0141] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for estimating the area of ​​a trough-type solar collector field, characterized in that, include: Obtain the model and parameters of the solar collectors used in the parabolic trough solar collector application; Obtain the solar irradiance and incident angle variation at the location of the parabolic trough collector field, and determine the solar irradiance received by the mirror surface of the parabolic trough collector per unit length; Obtain the optical efficiency of the parabolic trough collector, determine the solar irradiance absorbed per unit length of the absorber tube, obtain the thermal conversion efficiency and operating time of the parabolic trough collector, and determine the solar irradiance absorbed by the heat transfer medium flowing through the absorber tube per unit length. Based on the given temperature of the compressible heat medium and the temperature of the expansion heat, combined with the parameters of the collector field of the trough solar thermal power plant, the single loop length of the collector field is determined. Calculate the design flow rate of a single loop in the collector field based on the optimal solar irradiance value. Based on the given total amount of compressed heat medium to be heated, determine the flow rate of a single loop and the total number of loops required during the operating time. Calculate the total area of ​​the solar collector field based on the design flow rate of a single loop, the flow rate of a single loop, and the required total number of loops. The process of obtaining the solar irradiance and incident angle variation at the location of the trough solar collector, and determining the solar irradiance received by the mirror surface of the trough solar collector per unit length, specifically includes: The solar radiation received by the mirror surface of the unit length trough collector The calculation method is as follows: ； In the formula, This refers to the normal direct solar irradiance. The width of the opening of the trough-type solar collector; Angle of incidence; The incident angle correction factor is The function; The process of obtaining the optical efficiency of the trough solar collector, determining the solar irradiance absorbed per unit length of the absorber tube, obtaining the thermal conversion efficiency and operating time of the trough solar collector, and determining the solar irradiance absorbed by the heat transfer medium flowing through the absorber tube per unit length specifically includes: optical efficiency The calculation method is as follows: ； In the formula, For parabolic trough collectors, Let be the reflectivity of the parabolic mirror. The transmittance of the glass light-transmitting tube. The absorptivity of the heat absorber surface; The solar radiation absorbed by the heat absorber per unit length The calculation method is as follows: ； thermal conversion efficiency The calculation method is as follows: ； In the formula, the function The value can be obtained by fitting experimental data; The amount of solar radiation absorbed by the heat transfer medium per unit length of the heat absorber tube The calculation method is as follows: ； The determination of the single-loop length of the collector field based on the given temperature of the compressible heat medium and the temperature of its expansion, combined with the collector field parameters of the trough solar thermal power plant, specifically includes: The single-loop length of the trough-type solar collector The calculation method is as follows: ； In the formula and These are the design temperatures of the heat transfer medium for the heat of compression and expansion in a non-combustion compressed air energy storage system combined with a trough-type heat collector; The single-loop temperature rise gradient is determined based on the collector location in a commercial parabolic trough solar thermal power plant. Calculate the design flow rate of a single loop in the solar collector field based on the optimal solar irradiance value. Given the total amount of compressed heat medium to be heated, determine the flow rate of a single loop during operation and the required total number of loops. Specifically, this includes: The single-loop design flow rate of the trough-type solar collector The calculation method is as follows: ； In the formula This is the maximum solar irradiance that the heat transfer medium can absorb when flowing through a unit length of the heat absorber tube; is the specific enthalpy of the heat transfer medium, and is a single-valued function of the temperature of the heat transfer medium; The total number of loops in the trough-type solar collector field The calculation method is as follows: ； In the formula The total mass of the working fluid to be heated in a non-combustion-type compressed air energy storage system; Runtime; This represents the total operating time of the trough-type solar collector field. For time step; For any The mass flow rate of a single loop at any given time will Substitute for any time interval It can be obtained; The total area of ​​the solar collector field is calculated based on the design flow rate of a single loop, the flow rate of a single loop, and the required total number of loops. Specifically, this includes: The total area of ​​the trough-type heat collection field The calculation method is as follows: 。 2. A system for estimating the area of ​​a trough-type solar collector field, characterized in that, The system includes: The data acquisition module is used to acquire the model and parameters of the solar collectors used in trough solar collector applications; The first solar irradiance determination module is used to obtain the solar irradiance and incident angle changes at the location of the trough collector field, and to determine the solar irradiance received by the mirror of the trough collector per unit length. The second solar irradiance determination module is used to obtain the optical efficiency of the trough collector, determine the solar irradiance absorbed by the absorber tube per unit length, obtain the thermal conversion efficiency and operating time of the trough collector, and determine the solar irradiance absorbed by the heat transfer medium flowing through the absorber tube per unit length. The single-loop length determination module for the collector field is used to determine the single-loop length of the collector field based on the given temperature of the compressed heat working fluid and the temperature of the expansion heat, combined with the collector field parameters of the parabolic trough solar thermal power plant. The flow calculation module is used to calculate the design flow rate of a single loop in the collector field based on the optimal solar irradiance value, and to calculate the flow rate of a single loop and the total number of loops required during the operating time based on the given total amount of compressed heat medium to be heated. The total area calculation module for the solar collector field is used to calculate the total area of ​​the solar collector field based on the design flow rate of a single loop, the flow rate of a single loop, and the required total number of loops. Specifically, obtaining the solar irradiance and incident angle variation at the location of the trough solar collector field, and determining the solar irradiance received by the mirror surface of the trough solar collector per unit length, includes: The solar radiation received by the mirror surface of the unit length trough collector The calculation method is as follows: ； In the formula, This refers to the normal direct solar irradiance. The width of the opening of the trough-type solar collector; Angle of incidence; The incident angle correction factor is The function; The process of obtaining the optical efficiency of the trough solar collector, determining the solar irradiance absorbed per unit length of the absorber tube, obtaining the thermal conversion efficiency and operating time of the trough solar collector, and determining the solar irradiance absorbed by the heat transfer medium flowing through the absorber tube per unit length specifically includes: optical efficiency The calculation method is as follows: ； In the formula, For parabolic trough collectors, Let be the reflectivity of the parabolic mirror. The transmittance of the glass light-transmitting tube. The absorptivity of the heat absorber surface; The solar radiation absorbed by the heat absorber per unit length The calculation method is as follows: ； thermal conversion efficiency The calculation method is as follows: ； In the formula, the function The value can be obtained by fitting experimental data; The amount of solar radiation absorbed by the heat transfer medium per unit length of the heat absorber tube The calculation method is as follows: ； The determination of the single-loop length of the collector field based on the given temperature of the compressible heat medium and the temperature of its expansion, combined with the collector field parameters of the trough solar thermal power plant, specifically includes: The single-loop length of the trough-type solar collector The calculation method is as follows: ； In the formula and These are the design temperatures of the heat transfer medium for the heat of compression and expansion in a non-combustion compressed air energy storage system combined with a trough-type heat collector; The single-loop temperature rise gradient is determined based on the collector location in a commercial parabolic trough solar thermal power plant. Calculate the design flow rate of a single loop in the solar collector field based on the optimal solar irradiance value. Given the total amount of compressed heat medium to be heated, determine the flow rate of a single loop during operation and the required total number of loops. Specifically, this includes: The single-loop design flow rate of the trough-type solar collector The calculation method is as follows: ； In the formula This is the maximum solar irradiance that the heat transfer medium can absorb when flowing through a unit length of the heat absorber tube; is the specific enthalpy of the heat transfer medium, and is a single-valued function of the temperature of the heat transfer medium; The total number of loops in the trough-type solar collector field The calculation method is as follows: ； In the formula The total mass of the working fluid to be heated in a non-combustion-type compressed air energy storage system; Runtime; This represents the total operating time of the trough-type solar collector field. For time step; For any The mass flow rate of a single loop at any given time will Substitute for any time interval It can be obtained; The total area of ​​the solar collector field is calculated based on the design flow rate of a single loop, the flow rate of a single loop, and the required total number of loops. Specifically, this includes: The total area of ​​the trough-type heat collection field The calculation method is as follows: 。 3. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method for estimating the area of ​​a trough-type solar collector field as described in claim 1.

4. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method for estimating the area of ​​a trough-type solar collector field as described in claim 1.

5. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the method for estimating the area of ​​a trough-type solar collector field as described in claim 1.

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