A geothermal-based solar thermal energy storage system

Abstract

The present invention relates to the field of solar energy storage technology, including a geothermal-based solar thermal energy storage system, including: an energy storage tank, a water storage device, a water circulation pipeline, a downhole temperature sensor, a water temperature sensor, and a data processing control unit. The operation mode of the solar thermal energy storage system starts from a single-cycle operation mode, the energy collection and heating device heats the water in the heating tank to a preset temperature, the data processing control unit determines the conversion temperature through the water temperature sensor data, and determines whether to start the constant cycle operation mode by comparing the downhole temperature sensor data with the conversion temperature; in the constant cycle operation mode, the data processing control unit determines whether to start the detection mode according to the first stop condition and the second stop condition; in the detection mode, the data processing control unit determines whether to start the single-cycle operation mode according to the average water temperature in the reservoir and the standard average water temperature in the reservoir.

Description

Technical Field

[0001] The present invention relates to the technical field of solar energy energy storage, and in particular to a solar thermal energy storage system based on geothermal energy. Background Art

[0002] Using solar thermal energy for energy storage is a technology for efficiently utilizing renewable energy. It utilizes the clean and renewable nature of solar energy to convert solar energy into other forms of energy for power supply. Such a system can utilize renewable energy on a large scale, at low cost, continuously and stably for clean energy heating, and there is no pollution or emission.

[0003] Chinese Patent Publication No.: CN115247904A. Disclosed is a buried solar energy storage system for cold winters, including a solar energy device provided with a water inlet and a water outlet. The water inlet is connected to the water outlet pipe of an underground water storage tank through a pipeline and a water inlet pump, and the water outlet is connected to the water inlet pipe of the underground water storage tank through a pipeline and a water outlet pump. The water outlet pipe and the water inlet pipe are connected to the top of the underground water storage tank. A makeup water pipe and a domestic water outlet pipe are connected to the top of the underground water storage tank. The domestic water outlet pipe is connected to a filtering device through a water supply pump. The filtering device is connected to a water collection tank through a pipeline and a water transfer pump. A temperature sensor is installed inside the water collection tank. This device system can store energy through the geothermal insulation effect, and cooperate with the solar energy device to repeatedly heat low-temperature water to high temperature, which can be used for daily water use and winter heating.

[0004] It can be seen that when the solar energy storage system is working, the following problems exist: the energy storage process is not refined enough, and the operation mode of the energy storage system is not adjusted according to the external temperature. Summary of the Invention

[0005] Therefore, the present invention provides a solar thermal energy storage system based on geothermal energy to overcome the problems in the prior art that the energy storage process is not refined enough and the operation mode of the energy storage system is not adjusted according to the external temperature.

[0006] To achieve the above object, the present invention provides a solar thermal energy storage system based on geothermal energy, including

[0007] An energy storage tank for heating and storing water;

[0008] A water storage device for storing the water heated to a preset temperature in the energy storage tank;

[0009] A water circulation pipeline connected to the energy storage tank and the water storage device. The water extraction pipeline is used to extract the water in the water storage device to the heating device; the water discharge pipeline is used to discharge the water in the heating device to the water storage device;

[0010] Underground temperature sensor group, which includes several temperature sensors, and each of the temperature sensors is arranged on the water extraction pipeline and the water discharge pipeline;

[0011] Water temperature sensor, which is installed in the heating tank and used to detect the water temperature in the heating tank;

[0012] Data processing and control unit, which is connected to the energy storage tank body, the water storage device, the underground temperature sensor, the water temperature sensor and the water circulation pipeline. The data processing and control unit analyzes the temperature data collected by the water temperature sensor and the temperature data collected by the underground temperature sensor to determine the operation mode of the solar thermal energy storage system; in the single-cycle operation mode, the data processing and control unit generates the water temperature rising rate in the heating tank through the data collected by the water temperature sensor, and determines the water discharge temperature of the water discharge pipeline according to the rising rate; in the constant-cycle operation mode, the data processing and control unit determines whether to start the detection mode according to the first stop condition and the second stop condition.

[0013] Further, the energy storage tank body includes,

[0014] Heating tank, which is used to store the water to be heated;

[0015] Energy collection and heating device, which is used to convert solar energy into heat energy to heat the water in the heating tank;

[0016] The water storage device includes,

[0017] Underground reservoir, which is used to store the water heated to the preset temperature in the heating tank;

[0018] Water inlet, which is arranged on one side of the underground reservoir and used to inject water into the underground reservoir;

[0019] Water outlet, which is arranged on one side of the underground reservoir and used to discharge water from the underground reservoir.

[0020] Further, the water circulation pipeline includes: a water extraction pipeline and a water discharge pipeline. The water extraction pipeline has several water extraction ports, and the water discharge pipeline has several water discharge ports. Any one of the water extraction ports and the water discharge ports is correspondingly provided with an underground temperature sensor, which is used to detect the water temperature at different positions in the underground reservoir. The data processing and control unit calculates the average water temperature of the underground reservoir according to the temperatures collected by each underground temperature sensor at different positions in the underground reservoir. The number of underground temperature sensors is determined according to the capacity of the underground reservoir.

[0021] Further, after the underground reservoir is filled with water, the solar thermal energy storage system starts to operate, and is divided into three operation modes, including,

[0022] Single - cycle operation mode. The data - processing control unit controls the water - pumping pipeline to start pumping water from the underground reservoir into the heating tank. After the energy - collecting heating device heats the water temperature in the heating tank to the preset temperature, the data - processing control unit controls the water - discharging pipeline to start discharging water into the underground reservoir for storage;

[0023] Constant - cycle operation mode, which is the mode started after the water in the underground reservoir is heated to the conversion temperature in the single - cycle operation mode;

[0024] After the constant - cycle operation mode stops, it is the mode of periodically detecting the water temperature in the underground reservoir.

[0025] Furthermore, after the data - processing control unit controls the energy - collecting heating device to start, the data - processing control unit calculates and generates the heating rate of the water temperature in the heating tank based on the temperature data collected by the water - temperature sensor; the data - processing control unit analyzes the solar - light illumination value according to the heating rate of the water temperature in the heating tank, and the data - processing control unit adjusts the water - discharging temperature of the water - discharging pipeline according to the solar - light illumination value.

[0026] Furthermore, the data - processing control unit sets the influence parameter of the heating rate of the water temperature in the heating tank on the operation - mode conversion temperature of the solar - light and heat energy - storage system. The data - processing control unit generates the operation - mode conversion temperature of the solar - light and heat energy - storage system according to the influence parameter of the heating rate of the water temperature in the heating tank on the operation - mode conversion temperature of the solar - light and heat energy - storage system. The data - processing control unit determines the operation mode of the solar - light and heat energy - storage system through the comparison result of the temperature data collected by the water - temperature sensor and the operation - mode conversion temperature data of the solar - light and heat energy - storage system.

[0027] Furthermore, the data - processing control unit obtains the water temperatures in different regions of the underground reservoir according to the temperature data collected by each down - hole temperature sensor, and selects a set of data with the largest temperature difference; the data - processing control unit controls the water - pumping port of the corresponding water - pumping pipeline and the water - discharging port of the water - discharging pipeline to work according to the data group with the largest temperature difference, pumps the water in the area with the lowest temperature in the underground reservoir into the heating tank for heating, and opens the water - discharging port in the area with the highest temperature in the underground reservoir to discharge the water in the heating tank that has been heated to the water - discharging temperature;

[0028] The data - processing control unit sets the time for one water - pumping and one water - discharging as one - cycle time.

[0029] Furthermore, the data - processing control unit calculates the average water temperature in the water - storage device according to the temperature data collected by the water - temperature sensor, and the data - processing control unit compares the average water temperature in the water - storage device with the operation - mode conversion temperature of the solar - light and heat energy - storage system.

[0030] If the average water temperature in the water storage device is less than the operating mode conversion temperature of the solar thermal energy storage system, the data processing and control unit controls the solar thermal energy storage system to operate in a single-cycle operating mode;

[0031] If the average water temperature in the water storage device is greater than or equal to the operating mode conversion temperature of the solar thermal energy storage system, the data processing and control unit controls the solar thermal energy storage system to operate in a constant-cycle operating mode.

[0032] Furthermore, the data processing and control unit sets two conditions for stopping the constant-cycle operating mode of the energy storage tank, which are,

[0033] The first stop condition: The data processing and control unit sets a standard rising rate of the average water temperature in the underground reservoir. The data processing and control unit determines whether to stop the constant-cycle operating mode according to the comparison result between the standard rising rate of the average water temperature in the underground reservoir and the rising rate of the average water temperature in the underground reservoir;

[0034] The second stop condition: The data processing and control unit sets a stop operating water temperature of the energy storage tank. The data processing and control unit determines whether to stop the constant-cycle operating mode according to the comparison result between the stop operating water temperature of the energy storage tank and the average water temperature in the underground reservoir.

[0035] Furthermore, the data processing and control unit sets a stop operating detection period of the solar thermal energy storage system and an initial operating temperature of the solar thermal energy storage system. After the solar thermal energy storage system stops operating, the data processing and control unit calculates the average water temperature in the underground reservoir at regular intervals according to the stop operating detection period of the solar thermal energy storage system for the temperature data collected by the downhole temperature sensor;

[0036] If the average water temperature in the underground reservoir is less than the initial operating temperature of the solar thermal energy storage system, the data processing and control unit controls the solar thermal energy storage system to operate in a single-cycle operating mode.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows. The solar thermal energy storage system is divided into three operating modes: single-cycle operating mode, constant-cycle operating mode, and detection mode. According to the single-cycle operating mode, the solar thermal energy storage system can quickly heat the water in the heating tank. After the water temperature is heated to the preset temperature, the water is discharged into the water storage device through the water discharge pipeline, so that the water in the water storage device can be quickly heated, reducing the heating duration. According to the constant-cycle operating mode, the data processing and control unit circulates and heats the water in the water storage device between the heating tank and the water storage device. Since the water temperature can be guaranteed to be within a certain temperature range when used after the water temperature rises, it can avoid the water temperature in the water storage device decreasing due to excessive water consumption while the water heated in the heating tank has not been heated completely, resulting in too low water temperature to be used, increasing the practicability of this patent. According to the detection mode, when the water temperature in the water storage device reaches the preset stop water temperature, the water temperature in the water storage device can be periodically detected. If the temperature is too low, the data processing and control unit controls the heating tank to start heating the water in the water storage device, thereby ensuring that the water temperature in the water storage device is within the preset temperature range and guaranteeing the stability of the water temperature during water use.

[0038] Further, when the solar thermal energy storage system is in the single-cycle operating mode, the data processing and control unit determines the corresponding temperature of the water discharge port of the water discharge pipeline according to the temperature data collected by the downhole sensor, so as to determine to select the water discharge port with the highest temperature for water discharge when discharging water. The above water discharge process can effectively avoid the rapid decrease of the water discharge temperature caused by the large temperature difference between the warm water of each water discharge port in the water storage device and the water discharge temperature, reducing the heating time of the water in the water storage device. At the same time, the data processing and control unit determines the corresponding temperature of the water intake port of the water intake pipeline according to the downhole sensor data, so as to determine to select the water intake port with the lowest temperature for water intake when pumping water, so as to shorten the heating time when the energy storage tank heats the water in it, improving the practicability of this invention.

[0039] Further, the data processing and control unit obtains the heating rate of the water in the heating tank by analyzing the temperature data collected by the water temperature sensor, and adjusts the conversion temperature according to the heating rate of the water in the heating tank. The heating rate of the water in the heating tank can reflect the sunlight situation of the current weather. The faster the heating rate of the water in the heating tank, the higher the corresponding conversion temperature; the slower the heating rate of the water in the heating tank, the lower the corresponding conversion temperature. Through this adjustment method, solar energy can be fully utilized to quickly heat the water in the water storage device, shortening the heating time and extending the service life of each device.

[0040] Further, the data processing and control unit adjusts the water discharge temperature of the water discharge pipeline according to the heating rate of the water in the heating tank. When the heating rate of the water in the heating tank is high, it reflects good weather and strong sunlight. Strong sunlight can make the water in the heating tank heat up faster and reach a higher temperature. Therefore, when the sunlight is strong, the data processing and control unit sets a higher water discharge temperature for the water discharge pipeline, thereby increasing the energy utilization rate and reducing the heating time of the water in the heating tank.

[0041] Further, when the solar thermal energy storage system is in a constant circulation operation mode, the data processing and control unit determines whether to stop the constant circulation operation mode of the energy storage tank according to the first stop condition. The first stop condition is that the data processing and control unit determines whether to stop the constant circulation operation mode of the energy storage tank and start the detection mode by comparing the heating rate in the water storage device with the set standard heating rate in the water storage device. Through the above stop condition, it can be determined when the weather is bad and the light value is small, avoiding the situation that each device of the invention continues to work because the water temperature in the water storage device cannot reach the preset value when the weather is bad and the light value is small, effectively prolonging the service life of each device.

[0042] Further, when the solar thermal energy storage system is in a constant circulation operation mode, the data processing and control unit determines whether to stop the constant circulation operation mode of the energy storage tank according to the second stop condition. The second stop condition is that the data processing and control unit determines whether to stop based on whether the average water temperature in the water storage device reaches the water temperature at which the energy storage tank stops running set by the data processing and control unit. Through the above stop condition, it can be determined when the weather is good and the light value is large, avoiding unnecessary losses to each device when the water temperature in the water storage device has reached the highest temperature that can be reached at this light value and the devices of the invention continue to work when the weather is good and the light value is large.

[0043] Further, the data processing and control unit is set with a detection period for the stop of the solar thermal energy storage system and an initial operating temperature of the solar thermal energy storage system. After the solar thermal energy storage system stops running, the data processing and control unit regularly calculates the temperature data collected by the downhole temperature sensor according to the detection period for the stop of the solar thermal energy storage system, compares the calculation result with the initial operating temperature of the solar thermal energy storage system, and determines whether to control the continued operation of the solar thermal energy storage system based on the comparison result. The data processing and control unit setting the detection period for the stop of the solar thermal energy storage system can avoid the water temperature in the water storage device being too low, resulting in too long a heating time and unnecessary losses to each device when the solar thermal energy storage system runs next time. The data processing and control unit setting the initial operating temperature of the solar thermal energy storage system can perform staged heating on the water temperature in the water storage device, thereby ensuring that the water temperature is always within the usable temperature range, thus enhancing the practicality of the system. Description of the Drawings

[0044] Figure 1 This is a schematic structural diagram of the geothermal-based solar thermal energy storage system according to the embodiments of the present invention;

[0045] Figure 2 This is a flowchart of the operation of the geothermal-based solar thermal energy storage system according to the embodiments of the present invention;

[0046] Figure 3 This is a flowchart of the operation of the single-cycle operation mode of the geothermal-based solar thermal energy storage system according to the embodiments of the present invention;

[0047] Figure 4 This is a flowchart of the constant-cycle operation mode of the geothermal-based solar thermal energy storage system according to the embodiments of the present invention;

[0048] Figure 5 This is a flowchart of the operation of the detection mode of the geothermal-based solar thermal energy storage system according to the embodiments of the present invention. Detailed Embodiments

[0049] In order to make the objectives and advantages of the present invention clearer and more understandable, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0050] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0051] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0052] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] Please refer to Figures 1 - 5 as shown Figure 1Schematic diagram of the structure of the geothermal-based solar thermal energy storage system according to the embodiments of the present invention; Figure 2 Operation flow chart of the geothermal-based solar thermal energy storage system according to the embodiments of the present invention; Figure 3 Operation flow chart of the single-cycle operation mode of the geothermal-based solar thermal energy storage system according to the embodiments of the present invention; Figure 4 Operation flow chart of the constant-cycle mode of the geothermal-based solar thermal energy storage system according to the embodiments of the present invention; Figure 5 Operation flow chart of the detection mode of the geothermal-based solar thermal energy storage system according to the embodiments of the present invention.

[0054] The present invention discloses a geothermal-based solar thermal energy storage system, including,

[0055] Energy storage tank body, used for heating and storing water;

[0056] Water storage device, used for storing the water heated to a preset temperature in the heating tank;

[0057] Water circulation pipeline, which is connected to the heating device and the water storage device. The water extraction pipeline 1 is used to extract the water from the water storage device to the heating device; the water discharge pipeline 2 is used to discharge the water from the heating device to the water storage device;

[0058] Underground temperature sensor group 3, which includes several temperature sensors, and each of the temperature sensors is arranged on the water extraction pipeline and the water discharge pipeline;

[0059] Water temperature sensor 4, which is arranged in the heating tank and is used to detect the water temperature in the heating tank;

[0060] Data processing and control unit, which is connected to the energy storage tank body, the water storage device, the underground temperature sensor, the water temperature sensor and the water circulation pipeline. The data processing and control unit analyzes the data collected by the water temperature sensor and the data collected by the underground temperature sensor to determine the operation mode of the energy storage tank body; in the single-cycle operation mode, the data processing and control unit generates the heating rate of the water temperature in the heating tank based on the data collected by the water temperature sensor, and determines the water discharge temperature of the water discharge pipeline according to the heating rate; in the constant-cycle operation mode, the data processing and control unit determines whether to start the detection mode according to the first stop condition and the second stop condition.

[0061] Specifically, the energy storage tank body includes,

[0062] Heating tank 5, used for storing water to be heated;

[0063] Energy collection and heating device 6, used to convert solar energy into heat energy to heat the water in the heating tank;

[0064] The water storage device includes,

[0065] An underground water storage tank 7 for storing the water heated to a preset temperature in the heating tank;

[0066] An inlet 8 is provided on one side of the underground water storage tank for injecting water into the underground water storage tank;

[0067] A water outlet 9 is provided on one side of the underground water storage tank for discharging water from the underground water storage tank.

[0068] Specifically, the water circulation pipeline includes a water extraction pipeline and a water discharge pipeline. The water extraction pipeline has a plurality of water extraction ports, and the water discharge pipeline has a plurality of water discharge ports. A downhole temperature sensor is correspondingly provided for any one of the water extraction ports and the water discharge ports to detect the water temperature at different positions in the underground water storage tank. The data processing and control unit calculates the average water temperature of the underground water storage tank according to the temperatures collected by each downhole temperature sensor at different positions in the underground water storage tank. The number of downhole temperature sensors is determined according to the capacity of the underground water storage tank.

[0069] In the embodiment of the present invention,

[0070] The data processing and control unit controls the water discharge numbers of a plurality of water discharge ports in the water circulation pipeline as the first water discharge port A1, the second water discharge port A2,..., the nth water discharge port An. The order is sequentially from small to large in number and close to the water extraction pipeline. The temperature data collected by the downhole temperature sensors corresponding to each numbered water discharge outlet are Ta1, Ta2,..., Tan. For any water discharge port Ai, i = 1, 2,..., n, in the water discharge pipeline, the temperature data collected by the corresponding temperature sensor is Tai. The data processing and control unit selects the water discharge port of the water discharge pipeline with the highest temperature for water discharge;

[0071] The data processing and control unit controls the water extraction numbers of a plurality of water extraction ports in the water circulation pipeline as the first water extraction port B1, the first water extraction port B2,..., the nth water extraction port Bn. The order is sequentially from small to large in number and close to the water discharge pipeline. The temperature data collected by the downhole temperature sensors corresponding to each numbered water extraction outlet are Tb1, Tb2,..., Tbn. For any water extraction outlet Bj, j = 1, 2,..., n, in the water extraction pipeline, the temperature data collected by the corresponding temperature sensor is Tbj. The data processing and control unit selects the water extraction port of the water extraction pipeline with the lowest temperature for water extraction.

[0072] Specifically, the data processing and control unit obtains the temperatures near a plurality of water discharge ports in the water discharge pipeline according to the data of the downhole temperature sensors as A1 = 18°C, A2 = 20°C, A3 = 23°C, A4 = 25°C, A5 = 20°C. Then the data processing and control unit controls the water discharge port A4 of the water discharge pipeline to discharge water;

[0073] The data processing and control unit obtains the temperatures near several water pumping outlets of the water pumping pipeline according to the downhole temperature sensor data as B1 = 19°C, B2 = 20°C, B3 = 16°C, B4 = 23°C, B5 = 15°C, and then the data processing and control unit controls the water pumping at the B5 water pumping outlet of the water pumping pipeline.

[0074] The beneficial effect of the present invention is that when the solar thermal energy storage system operates in a single-cycle mode, the data processing and control unit determines the corresponding temperature of the water discharge outlet of the water discharge pipeline according to the temperature data collected by the downhole sensor, so as to determine to select the water discharge outlet with the highest temperature for water discharge when discharging water. The above water discharge process can effectively avoid the rapid decrease of the water discharge temperature caused by the too large temperature difference between the warm water at each water discharge outlet in the water storage device and the water discharge temperature, reduce the time for heating the water in the water storage device. At the same time, the data processing and control unit determines the corresponding temperature of the water pumping outlet of the water pumping pipeline according to the downhole sensor data, so as to determine to select the water pumping outlet with the lowest temperature for water pumping when pumping water. Thus, when the energy storage tank heats the water in it, the heating time can be shortened, and the practicability of the present invention can be improved.

[0075] The data processing and control unit calculates the average water temperature Tp in the underground reservoir according to the downhole temperature sensor data, and Tp = (Ta1 + Ta2 +... + Tan + Tb1 + Tb2 +... + Tbn) / 2n.

[0076] Specifically, after the underground reservoir is filled with water, the energy storage tank starts to operate, which is divided into three operation modes, including

[0077] The single-cycle operation mode, in which the data processing and control unit controls the water pumping pipeline to start pumping the water in the underground reservoir into the heating tank. After the energy collection and heating device heats the water temperature in the heating tank to the preset temperature, the data processing and control unit controls the water discharge pipeline to start discharging the water into the underground reservoir for storage;

[0078] The constant-cycle operation mode, which is the mode started after the water in the underground reservoir is heated to the conversion temperature in the single-cycle operation mode;

[0079] The detection mode, which is the mode in which the constant-cycle operation mode stops and the water temperature in the underground reservoir is periodically detected.

[0080] Furthermore, the solar thermal energy storage system is divided into three operating modes: single-cycle operating mode, constant-cycle operating mode, and detection mode. According to the single-cycle operating mode, the solar thermal energy storage system can quickly heat the water in the heating tank. After the water temperature is heated to the preset temperature, the water is discharged into the water storage device through the water discharge pipeline, so that the water in the water storage device can be quickly heated, reducing the heating time. According to the constant-cycle operating mode, the data processing and control unit circulates and heats the water in the water storage device between the heating tank and the water storage device. Since the water temperature can be guaranteed to be within a certain temperature range when in use after the water temperature rises, it can avoid the water temperature in the water storage device from decreasing due to excessive water consumption while the water heated in the heating tank has not been heated completely, resulting in too low water temperature to be used, increasing the practicability of this patent. According to the detection mode, when the water temperature in the water storage device reaches the preset stop water temperature, the water temperature in the water storage device can be periodically detected. If the temperature is too low, the data processing and control unit controls the heating tank to start heating the water in the water storage device, so as to ensure that the water temperature in the water storage device is within the preset temperature range and guarantee the stability of the water temperature when in use.

[0081] Specifically, after the data processing and control unit controls the energy collection and heating device to start, the data processing and control unit calculates and generates the heating rate of the water temperature in the heating tank as K = (T2 - T1) / t according to the temperature data collected by the water temperature sensor, where T1 is the initial water temperature in the heating tank, T2 is the water temperature in the heating tank at any moment greater than the initial water temperature, and T2 is the value within the heating rising period, and t is the time for the water temperature in the heating tank to be heated from T1 to T2;

[0082] The data processing and control unit analyzes the solar light value according to the heating rate of the water temperature in the heating tank. The solar light value is Y = Ya + K × a, where Ya is the initial solar light value, a is the influence determination compensation parameter of the heating rate on the solar light value. For any influence parameter a of the heating rate on the solar light value, its value is related to the corresponding heating rate K. The data processing and control unit sets the heating rate interval and sets different influence parameters of the heating rate on the solar light value according to different heating rate intervals;

[0083] The data processing and control unit is provided with a first-class heating rate KC1 affecting the initial solar light value and a first-class heating rate KC2 affecting the initial solar light value.

[0084] If K = 0, then Ya = 0;

[0085] If 0 < K < KC1, then Ya = 3;

[0086] If KC1 ≤ K ≤ KC2, then Ya = 7;

[0087] If K > KC2, then Ya = 10;

[0088] A first heating rate standard value KB1 and a second heating rate standard value KB2 are set in the data processing and control unit.

[0089] If K ≤ KB1, then select the first heating rate and use the preset influence parameter value a1 of the solar light value as the value of the influence parameter a.

[0090] If KB1 < K ≤ KB2, then select the second heating rate and use the preset influence parameter value a2 of the solar light value as the value of the influence parameter a.

[0091] If K > KB2, then select the third heating rate and use the preset influence parameter value a3 of the solar light value as the value of the influence parameter a.

[0092] In this embodiment, KB1 = 6.5 °C / h and KB2 = 11 °C / h.

[0093] If the heating rate K is in the range of (0 - 6.5 °C / h], then a = a1. a1 is the influence determination compensation parameter of the heating rate on the solar light value when the heating rate K is in the range of (0 - 6.5 °C / h], and a1 is set to 1.3.

[0094] If the heating rate K is in the range of [6.5 °C / h - 10 °C / h], then a = a2. a2 is the influence determination compensation parameter of the heating rate on the solar light value when the heating rate K is in the range of (6.5 °C / h - 10 °C / h], and a2 is set to 1.6.

[0095] If the heating rate K > 10 °C / h, then a = a3. a3 is the influence determination compensation parameter of the heating rate on the solar light value when the heating rate K > 10 °C / h, and a3 is set to 2.3.

[0096] The water discharge temperature Tf of the water discharge pipeline is Tf = T0 + Y × b, where T0 is the initial water temperature in the heating tank, b is a fixed value of the influence parameter of the solar light value on the water discharge temperature of the water discharge pipeline, the data processing and control unit adjusts the water discharge temperature of the water discharge pipeline according to the solar light value. For any solar light value that affects the water discharge temperature Tf of the water discharge pipeline, its value is related to the corresponding solar light value Y. The data processing and control unit sets a solar light value interval and sets different influences of different solar light value intervals on the water discharge temperature of the water discharge pipeline.

[0097] If the solar light value Y is in the range of [0, 38), then Tf = Tf1. Tf1 is the influence of the solar light value on the water discharge temperature of the water discharge pipeline when the solar light value Y is in the range of [0, 38), and Tf1 is set to 60 °C.

[0098] If the solar light intensity value Y is in the range of [38, 67), then Tf = Tf2. When the solar light intensity value Y is in the range of [38, 67), the solar light intensity affects the water discharge temperature of the water discharge pipeline, and Tf2 is set to 70 °C.

[0099] If the solar light intensity value Y ≥ 67, then Tf = Tf3. When the solar light intensity value Y ≥ 67, the solar light intensity affects the water discharge temperature of the water discharge pipeline, and Tf1 is set to 85 °C.

[0100] Furthermore, the data processing and control unit adjusts the water discharge temperature of the water discharge pipeline according to the heating rate of the water in the heating tank. When the heating rate of the water in the heating tank is high, it reflects good weather and strong sunlight. Strong sunlight can make the water in the heating tank heat up faster and the water temperature higher. Therefore, when the sunlight is strong, the data processing and control unit sets a higher water discharge temperature for the water discharge pipeline, thereby increasing the energy utilization rate and reducing the heating time of the water in the heating tank.

[0101] Specifically, the data processing and control unit sets the influence parameter of the heating rate of the water temperature in the heating tank on the operation mode conversion temperature of the solar thermal energy storage system as c. The data processing and control unit generates the operation mode conversion temperature of the solar thermal energy storage system as Tz = T0` + K × c according to the heating rate of the water temperature in the heating tank and the influence parameter of the heating rate of the water temperature in the heating tank on the operation mode conversion temperature of the energy storage tank body. Here, T0` is the initial water temperature in the water storage device, and the data processing and control unit determines the operation mode of the solar thermal energy storage system through the comparison result of the temperature data collected by the water temperature sensor and the operation mode conversion temperature of the solar thermal energy storage system.

[0102] In the embodiment of the present invention, the data processing and control unit analyzes the relationship between the heating rate and the operation mode conversion temperature of the energy storage tank body, and sets different operation mode conversion temperatures of the energy storage tank body according to different heating rate intervals of the heating rate.

[0103] If the heating rate K is in the range of (0 - 6.5 °C / h], then Tz = Tz1. When the heating rate K is in the range of (0 - 6.5 °C / h], Tz1 is the operation mode conversion temperature of the energy storage tank body, and Tz1 is set to 55 °C.

[0104] If the heating rate K is in the range of [6.5 °C / h - 10 °C / h], then Tz = Tz2. When the heating rate K is in the range of [6.5 °C / h - 10 °C / h], Tz2 is the operation mode conversion temperature of the energy storage tank body, and Tz2 is set to 65 °C.

[0105] If the heating rate K > 10 °C / h, then Tz = Tz3. When the heating rate K > 10 °C / h, Tz3 is the operation mode conversion temperature of the energy storage tank body, and Tz3 is set to 78 °C.

[0106] Furthermore, the data processing and control unit obtains the heating rate of the water in the heating tank through the temperature data collected by the water temperature sensor, and adjusts the conversion temperature according to the heating rate of the water in the heating tank. The heating rate of the water in the heating tank can reflect the weather and light conditions at that time. The faster the heating rate of the water in the heating tank, the higher the corresponding conversion temperature, and the slower the heating rate of the water in the heating tank, the lower the corresponding conversion temperature. Through this adjustment method, solar energy can be fully utilized to quickly heat the water in the water storage device, thereby shortening the heating time and extending the service life of each device.

[0107] The data processing control unit sets the time required to complete one pumping and one draining as one cycle time tx.

[0108] Specifically, the data processing control unit calculates the average water temperature in the water storage device according to the temperature data collected by the water temperature sensor, and the data processing control unit compares the average water temperature in the water storage device with the operating mode conversion temperature of the solar thermal energy storage system.

[0109] If Tp<Tz, the data processing control unit controls the solar thermal energy storage system to operate in a single cycle operation mode;

[0110] If Tp≥Tz, the data processing control unit controls the solar thermal energy storage system to operate in a constant cycle operation mode.

[0111] Specifically, the data processing control unit is provided with the water temperature T2 at which the solar thermal energy storage system stops operating, and the data processing control unit is provided with the average water temperature rise rate Kp in the water reservoir = (Tp`-Tp) / tx, wherein Tp` is the water temperature after the average water temperature in the water reservoir rises within the cycle time tx, and the solar thermal energy storage system operates in a constant cycle operation mode. The data processing control unit is provided with two conditions for stopping the constant cycle operation mode of the energy storage tank, which are respectively,

[0112] The first stop condition is that if Kp≤Kb in two consecutive cycles, where Kb is the standard rate of increase of the average water temperature in the water reservoir, the data processing control unit determines to stop the constant cycle operation mode of the solar thermal energy storage system and start the detection mode;

[0113] If Kp>Kb, the data processing control unit determines that the solar thermal energy storage system continues to operate in the normal cycle operation mode;

[0114] Further, when the solar thermal energy storage system is in the constant circulation operation mode, the data processing and control unit determines whether to stop the constant circulation operation mode of the energy storage tank according to the first stop condition. The first stop condition is that the data processing and control unit determines whether to stop the constant circulation operation mode of the energy storage tank and start the detection mode by comparing the heating rate in the water storage device with the set standard heating rate in the water storage device. Through the above stop condition, it can be determined when the weather is bad and the light value is small, avoiding the situation that when the weather is bad and the light value is small, each device of the invention continues to work because the water temperature in the water storage device cannot reach the preset value, effectively extending the service life of each device.

[0115] The second stop condition is that the data processing and control unit sets the stop operation water temperature of the solar thermal energy storage system. The data processing and control unit determines whether to stop the constant circulation operation mode of the solar thermal energy storage system according to the comparison result of the stop operation water temperature of the solar thermal energy storage system and the average water temperature in the reservoir.

[0116] If Tp≥T2, the data processing and control unit determines to stop the constant circulation operation mode of the solar thermal energy storage system and start the detection mode.

[0117] If Tp<T2, the data processing and control unit determines that the solar thermal energy storage system continues to operate in the constant circulation operation mode. If the condition for stopping the constant circulation operation mode of the solar thermal energy storage system meets any one of the above, the data processing and control unit stops the constant circulation operation mode of the solar thermal energy storage system and starts the detection mode.

[0118] Further, when the solar thermal energy storage system is in the constant circulation operation mode, the data processing and control unit determines whether to stop the constant circulation operation mode of the energy storage tank according to the second stop condition. The second stop condition is that the data processing and control unit determines whether the average water temperature in the water storage device reaches the stop operation water temperature of the energy storage tank set by the data processing and control unit. Through the above stop condition, it can be determined when the weather is good and the light value is large, avoiding the situation that when the weather is good and the light value is large, the water temperature in the water storage device has reached the highest temperature that can be reached by this light value, and each device of the invention continues to work, thus causing unnecessary losses to each device.

[0119] Specifically, the data processing and control unit sets the stop operation detection period of the solar thermal energy storage system and the initial operation temperature of the solar thermal energy storage system as T1. After the solar thermal energy storage system stops operating, the data processing and control unit calculates the average water temperature in the underground reservoir regularly according to the stop operation detection period of the solar thermal energy storage system for the data of the downhole temperature sensor.

[0120] If Tp < T1, the data processing and control unit controls the solar thermal energy storage system to operate in a single-cycle operation mode.

[0121] Further, the data processing and control unit is provided with a detection period for the stop of the solar thermal energy storage system and an initial operating temperature of the solar thermal energy storage system. After the solar thermal energy storage system stops operating, the data processing and control unit periodically calculates the data of the downhole temperature sensor according to the detection period for the stop of the solar thermal energy storage system, compares the calculation result with the initial operating temperature of the solar thermal energy storage system, and determines whether to control the solar thermal energy storage system to continue operating according to the comparison result. The data processing and control unit setting the detection period for the stop of the solar thermal energy storage system can prevent the water temperature in the water storage device from being too low, resulting in too long heating time and unnecessary losses to each device when the solar thermal energy storage system operates next time. The data processing and control unit setting the initial operating temperature of the solar thermal energy storage system can perform staged heating on the water temperature in the water storage device, so as to ensure that the water temperature is always within the operating temperature range, thereby improving the practicability of the system.

[0122] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0123] The above are only the preferred embodiments of the present invention and are not used to limit the present invention; for those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A geothermal solar thermal energy storage system, characterized in that: include, Energy storage tank, used to heat the stored water; A water storage device, used to store water heated to a preset temperature in the energy storage tank; A water circulation pipeline connected to the energy storage tank and the water storage device, and a water pumping pipeline used to pump water from the water storage device into the heating device; The water discharge pipeline is used to discharge the water of the heating device into the water storage device; A downhole temperature sensor group, comprising a plurality of temperature sensors, each of which is arranged on a water pumping pipeline and a water discharge pipeline; A water temperature sensor is placed in the heating tank and is used to detect the water temperature in the heating tank; a data processing control unit connected to the energy storage tank, the water storage device, the downhole temperature sensor, the water temperature sensor and the water circulation pipeline, and the data processing control unit determines the operation mode of the solar thermal energy storage system by analyzing the temperature data collected by the water temperature sensor and the temperature data collected by the downhole temperature sensor; In the single-cycle operation mode, the data processing control unit generates the water temperature rise rate in the heating tank through the data collected by the water temperature sensor, and determines the water discharge temperature of the water discharge pipeline according to the temperature rise rate; In the normal cycle operation mode, the data processing control unit determines whether to start the detection mode according to the first stop condition and the second stop condition.

2. The geothermal solar thermal energy storage system according to claim 1, characterized in that: The energy storage tank comprises: A heating tank for storing water to be heated; An energy collection and heating device, used to convert solar energy into thermal energy to heat the water in the heating tank; The water storage device comprises: An underground water storage tank, used to store the water heated to a preset temperature in the heating tank; A water inlet, arranged at one side of the underground water reservoir, for injecting water into the underground water reservoir; The water outlet is arranged on one side of the underground water reservoir and is used to discharge water from the underground water reservoir.

3. The geothermal solar thermal energy storage system according to claim 2 is characterized in that: The water circulation pipeline includes: a water pumping pipeline and a water discharge pipeline, wherein the water pumping pipeline has several water pumping ports, and the water discharge pipeline has several water discharge ports. A downhole temperature sensor is correspondingly arranged at each of the water pumping ports and the water discharge ports, for detecting the water temperature at different positions in the underground water reservoir. The data processing and control unit calculates the average water temperature of the underground water reservoir based on the temperatures collected by each downhole temperature sensor at different positions in the underground water reservoir. The number of downhole temperature sensors is determined according to the capacity of the underground water reservoir.

4. The geothermal-based solar thermal energy storage system according to claim 2, characterized in that: After the underground water tank is filled with water, the solar thermal energy storage system starts to operate, which is divided into three operating modes, including: In the single-cycle operation mode, the data processing control unit controls the water pumping pipeline to start pumping water from the underground water tank into the heating tank. After the energy collection and heating device heats the water in the heating tank to a preset temperature, the data processing control unit controls the water discharge pipeline to start discharging water into the underground water tank for storage. A constant cycle operation mode, wherein the single cycle operation mode is started after the water in the underground water storage tank is heated to a conversion temperature; The detection mode is a mode for periodically detecting the water temperature in the underground water storage tank after the constant circulation operation mode is stopped.

5. The geothermal-based solar thermal energy storage system according to claim 4, characterized in that: After the data processing control unit controls the energy collection and heating device to start, the data processing control unit calculates and generates a heating rate of the water temperature in the heating tank according to the temperature data collected by the water temperature sensor; The data processing control unit analyzes the solar radiation value according to the temperature increase rate of the water temperature in the heating tank, and adjusts the water discharge temperature of the water discharge pipeline according to the solar radiation value.

6. The geothermal-based solar thermal energy storage system according to claim 5, characterized in that: The data processing and control unit is provided with an influence parameter of the heating rate of the water temperature in the heating tank on the operating mode conversion temperature of the solar thermal energy storage system. The data processing and control unit generates the operating mode conversion temperature of the solar thermal energy storage system according to the influence parameter of the heating rate of the water temperature in the heating tank on the operating mode conversion temperature of the solar thermal energy storage system. The data processing and control unit determines the operating mode of the solar thermal energy storage system by comparing the temperature data collected by the water temperature sensor with the operating mode conversion temperature data of the solar thermal energy storage system.

7. The geothermal solar thermal energy storage system according to claim 6, characterized in that: The data processing control unit obtains the water temperature of different areas of the underground water reservoir according to the temperature data collected by each downhole temperature sensor, and selects a group of data with the largest temperature difference; the data processing control unit controls the corresponding water inlet of the water pumping pipeline and the water outlet of the water discharge pipeline to work according to the data group with the largest temperature difference, extracts the water in the lowest temperature area of ​​the underground water reservoir into the heating tank for heating, and opens the water outlet of the highest temperature area of ​​the underground water reservoir to discharge the water in the heating tank that has been heated to the water discharge temperature; The data processing control unit sets the time to complete one pumping and one draining as one cycle time.

8. The geothermal-based solar thermal energy storage system according to claim 7, characterized in that: The data processing control unit calculates the average water temperature in the water storage device based on the temperature data collected by the water temperature sensor, and the data processing control unit compares the average water temperature in the water storage device with the operating mode conversion temperature of the solar thermal energy storage system. If the average water temperature in the water storage device is lower than the operating mode switching temperature of the solar thermal energy storage system, the data processing control unit controls the solar thermal energy storage system to operate in a single cycle operating mode; If the average water temperature in the water storage device is greater than or equal to the operating mode conversion temperature of the solar thermal energy storage system, the data processing control unit controls the solar thermal energy storage system to operate in a constant cycle operating mode.

9. The geothermal-based solar thermal energy storage system according to claim 8, characterized in that: The solar thermal energy storage system operates in a constant cycle operation mode, and the data processing control unit is provided with two conditions for stopping the constant cycle operation mode, which are: The first stop condition, the data processing control unit is provided with a standard rising rate of the average water temperature in the underground water reservoir, and the data processing control unit determines whether to stop the constant circulation operation mode according to a comparison result between the standard rising rate of the average water temperature in the underground water reservoir and the rising rate of the average water temperature in the underground water reservoir; The second stop condition is that the data processing control unit is provided with the water temperature at which the energy storage tank stops operating, and the data processing control unit determines whether to stop the constant circulation operation mode according to the comparison result between the water temperature at which the energy storage tank stops operating and the average water temperature in the underground water tank.

10. The geothermal-based solar thermal energy storage system according to claim 9, characterized in that: The data processing control unit is provided with a solar thermal energy storage system stop operation detection cycle and an initial operation temperature of the solar thermal energy storage system. When the solar thermal energy storage system stops operating, the data processing control unit regularly calculates the temperature data collected by the downhole temperature sensor according to the solar thermal energy storage system stop operation detection cycle to obtain the average water temperature in the underground water storage tank; If the average water temperature in the underground water tank is lower than the initial operating temperature of the solar thermal energy storage system, the data processing control unit controls the solar thermal energy storage system to operate in a single cycle operation mode.

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