Solar energy and geothermal energy coupled heat supply control method and system and electronic equipment

Abstract

The invention provides a solar energy and geothermal energy coupled heat supply control method and system and electronic equipment, and relates to the technical field of heat supply control, and the method comprises the steps that a first environment parameter representing the solar energy input intensity and a second environment parameter representing the underground heat source state are obtained; the solar heat supply heat is calculated according to the first environment parameter, and a geothermal heat exchange path is determined according to the second environment parameter; the performance coefficient of the ground source heat pump is calculated according to the soil average temperature corresponding to the geothermal heat exchange path, and the geothermal energy heat supply heat is calculated according to the performance coefficient and the heat pump input power; according to the matching degree between the heat supply demand and the solar heat supply heat, the target heat supply proportion between the solar heat supply heat and the geothermal heat supply heat is determined; and determining a target heat supply device based on the target heat supply proportion so as to carry out coupling heat supply control of solar energy and geothermal energy. According to the invention, cooperative coupling control of multiple energy sources is realized, and the overall energy efficiency and operation stability of the system are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat supply control, in particular to a heat supply control method and system coupling solar energy and geothermal energy and an electronic device. BACKGROUND

[0002] At present, in the existing solar-geothermal combined heat supply system, solar energy and geothermal energy usually adopt a time-sharing start-stop or simple superposition operation mode, lack a dynamic energy distribution mechanism based on real-time working conditions, resulting in low energy collaborative utilization efficiency. The temperature control system relies on the single-point temperature signal of the heat storage water tank, and does not comprehensively consider the actual heat load change on the user side, which easily causes large indoor temperature fluctuations. The underground heat exchange device has fixed burial depth and single structure, and long-term heat extraction or heat rejection easily causes imbalance of the soil temperature field, and the heat exchange capacity decreases year by year. In addition, the system lacks effective standby heating means when solar energy is insufficient or equipment fails, affecting the continuous heating reliability. SUMMARY

[0003] The present application aims to provide a heat supply control method and system coupling solar energy and geothermal energy and an electronic device to alleviate the above technical problems in the prior art.

[0004] In a first aspect, the present application provides a heat supply control method coupling solar energy and geothermal energy, comprising the following steps: obtaining a first environmental parameter representing solar energy input intensity and a second environmental parameter representing underground heat source state; calculating solar heat supply heat according to the first environmental parameter, and determining a geothermal heat exchange path according to the second environmental parameter; wherein the geothermal heat exchange path is determined by adjusting the burial depth and pipe diameter of the underground heat exchange coil; calculating the performance coefficient of the ground source heat pump according to the average soil temperature corresponding to the geothermal heat exchange path, and calculating the geothermal heat supply heat according to the performance coefficient and the heat pump input power; determining the target heat supply proportion between the solar heat supply heat and the geothermal heat supply heat according to the matching degree between the heat supply demand and the solar heat supply heat; determining the target heat supply device based on the target heat supply proportion to perform coupling heat supply control of solar energy and geothermal energy.

[0005] In an optional embodiment, the first environmental parameter includes solar radiation intensity, collector outlet temperature and outdoor environment temperature; calculating the solar heat supply heat according to the first environmental parameter comprises: calculating the total energy projected to the collector surface per unit time based on the solar radiation intensity and the effective area of the collector; calculating the temperature difference data between the collector surface and the environment according to the outdoor environment temperature and the collector outlet temperature; The standard set heat collection efficiency is corrected based on the temperature difference data to obtain an actual heat collection efficiency under the current working condition; The solar heat supply heat is calculated according to the actual heat collection efficiency, the total energy per unit time and the continuous running time under the current working condition.

[0006] In an optional embodiment, the second environmental parameter is the soil temperature at different depths in a geothermal heat exchange path; and the geothermal heat exchange path is determined according to the second environmental parameter, including: The soil level corresponding to the soil temperature higher than the preset threshold is determined from the soil temperatures at multiple different depths; The embedding depth of the underground heat exchange coil corresponding to the soil level is determined; The electromagnetic valve is controlled to switch to the target pipe diameter according to the current heating load demand data; The geothermal heat exchange path is determined based on the embedding depth and the target pipe diameter.

[0007] In an optional embodiment, the coefficient of performance of the ground source heat pump is calculated according to the average soil temperature corresponding to the geothermal heat exchange path, and the geothermal energy heating heat is calculated according to the coefficient of performance and the input power of the heat pump, including: The soil temperatures at multiple different depths corresponding to the geothermal heat exchange path are weighted to obtain equivalent temperature data for characterizing the heat state on the geothermal heat exchange path; The energy conversion efficiency of the ground source heat pump under the current working condition is estimated based on the equivalent temperature data to obtain the coefficient of performance of the ground source heat pump; The actual electric energy input of the ground source heat pump is obtained, the effective heat output by the geothermal energy system is calculated based on the actual electric energy input and the coefficient of performance, and the geothermal energy heating heat is determined according to the effective heat.

[0008] In an optional embodiment, the target heating proportion between the solar heat supply heat and the geothermal energy heating heat is determined according to the matching degree between the heating demand and the solar heat supply heat, including: The heating demand is calculated based on the user set temperature, the actual indoor temperature, the number of rooms and the heat dissipation area; The multiple heating stage intervals are divided according to the proportional relationship between the solar heat supply heat and the heating demand; When the proportion of the solar heat supply heat is higher than the preset proportion, the first heating proportion of the solar system and the second heating proportion of the geothermal energy system are determined; When the proportion of the solar heat supply heat is lower than the preset proportion, the second heating proportion is correspondingly increased and the first heating proportion is decreased; The target heating proportion between the solar heat supply heat and the geothermal energy heating heat is determined based on the dynamically adjusted first heating proportion and the scheduled second heating proportion.

[0009] In an optional embodiment, the target heating device is determined based on the target heating proportion to perform the coupling heating control of solar energy and geothermal energy, comprising: starting or stopping the target water pump in the solar heat collection circulating loop, adjusting the working frequency of the ground source heat pump and the flow of the geothermal side circulating water pump according to the target heating proportion; controlling the state of the internal flow guide structure of the double-stage heat storage water tank to supply the high-temperature zone water to the user end and the low-temperature zone water for preheating and supplementing to perform the coupling heating control of solar energy and geothermal energy.

[0010] In an optional embodiment, it further comprises: continuously monitoring the indoor temperature change data of multiple positions of the user end; predicting the heating load fluctuation in the next stage based on the historical operation data and the indoor temperature change data; adjusting the geothermal heat exchange path or changing the target heating proportion according to the predicted heating load fluctuation; when the main heating equipment failure is detected, switching to the emergency heating mode, and sending a failure alarm signal to the remote monitoring terminal.

[0011] In a second aspect, the present application provides a heating control system coupling solar energy and geothermal energy, comprising an energy collection unit, an underground heat exchange unit, an energy storage unit, an energy conversion unit, a sensing and monitoring unit, a control unit, a circulating driving unit and an emergency heating unit; The energy collection unit is connected with the energy storage unit through a pipeline, used for collecting solar thermal energy and transmitting it to the energy storage unit; The underground heat exchange unit is arranged below the ground, and its inlet and outlet are respectively connected to the energy conversion unit through pipelines, used for extracting or releasing thermal energy from the soil; The output end of the energy conversion unit is connected with the energy storage unit through a pipeline, used for inputting the low-temperature thermal energy from the underground heat exchange unit into the energy storage unit after temperature rising treatment; The energy storage unit is provided with a layered structure, and is internally configured with a temperature partition device to form a high-temperature heat storage zone and a low-temperature preheating zone, and realizes controllable heat exchange between the two zones through an internal flow guide structure; The sensing and monitoring unit comprises multiple distributed sensors arranged in the energy collection unit, the underground heat exchange unit, the energy storage unit, the user end and the external environment, used for collecting solar radiation intensity, environmental temperature, heat collection medium temperature, soil temperature at different depths, energy storage medium temperature, actual temperature and flow parameter of the user side in real time, and transmitting the collected data to the control unit; The control unit is electrically connected to the energy harvesting unit, energy conversion unit, underground heat exchange unit, energy storage unit, sensing and monitoring unit and circulation drive unit. It receives the acquisition signals from the sensing and monitoring unit, calculates the current total heating load demand and the ratio of heat that can be provided by solar energy to heat that can be provided by geothermal energy according to the preset algorithm, and generates control commands to output to the corresponding execution components. The circulating drive unit includes multiple adjustable speed water pumps, which are respectively installed in the energy harvesting loop, the underground heat exchange loop and the user heating loop. They are controlled by the control unit and dynamically adjust the medium flow rate of each loop according to the heating load. The emergency heating unit is installed in the energy storage unit or the user's heating circuit and is electrically connected to the control unit. When the main energy supply capacity is insufficient or the system fails, it is activated according to the control unit's instructions to supplement the system with heat energy.

[0012] Thirdly, the present invention provides an electronic device including a processor and a memory, the memory storing computer-executable instructions that can be executed by the processor, the processor executing the computer-executable instructions to implement the solar and geothermal energy coupling heating control method of any of the foregoing embodiments.

[0013] Fourthly, the present invention provides a computer-readable storage medium storing computer-executable instructions. When the computer-executable instructions are invoked and executed by a processor, the computer-executable instructions cause the processor to implement the solar and geothermal energy coupling heating control method of any of the foregoing embodiments.

[0014] The solar and geothermal energy coupled heating control method, system, and electronic equipment provided in this application achieve real-time sensing of the input capacity of the two energy sources by acquiring solar energy input intensity and underground heat source state parameters, solving the problem of low energy utilization caused by the lack of dynamic coordination mechanism in traditional systems. By dynamically determining the geothermal heat exchange path based on soil temperature and adjusting the burial depth and pipe diameter, the underground heat exchange efficiency is optimized, effectively alleviating the problem of temperature imbalance and heat exchange attenuation in the soil during long-term operation. Based on this path, the performance coefficient of the ground source heat pump is calculated and the geothermal heating capacity is accurately estimated, improving the accuracy of energy dispatch. Combining the matching degree between heating demand and solar heating capacity, the dual-energy heating ratio is dynamically determined, and the target heating device is selected accordingly, realizing intelligent coupling control of multi-energy synergy, avoiding frequent equipment start-ups and shutdowns, and improving the overall energy efficiency and operational stability of the system. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 A flowchart illustrating a heating control method that couples solar and geothermal energy, provided as an embodiment of this application; Figure 2 A schematic diagram of a solar and geothermal energy coupled heating control system provided for an embodiment of this application; Figure 3 A schematic diagram of the operation phase of a solar and geothermal coupled heating control system provided in this application embodiment; Figure 4 This is a structural diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] This application provides a heating control method that couples solar and geothermal energy, see [link to relevant documentation]. Figure 1 As shown, the method mainly includes the following steps: S110, obtain the first environmental parameter characterizing the intensity of solar energy input and the second environmental parameter characterizing the state of the underground heat source.

[0021] The aforementioned first environmental parameter refers to key parameters used to characterize the current availability of solar energy, such as ambient temperature, solar radiation intensity, and real-time temperature at the outlet of the solar collector. These parameters can be collected by radiation sensors and temperature sensors installed on the photovoltaic-thermal integrated collector array.

[0022] The second environmental parameter mentioned above refers to the state parameters used to assess the extractability of underground soil thermal energy, mainly including the real-time soil temperature at different burial depths (e.g., 60 meters, 100 meters, 150 meters, etc.). This type of data is acquired by multi-layer temperature sensing devices buried underground to reflect the distribution of underground temperature gradients.

[0023] In one implementation, a distributed sensor network can be used to simultaneously collect the first environmental parameter characterizing the intensity of solar energy input and the second environmental parameter characterizing the state of the underground heat source for subsequent energy estimation and path decision-making.

[0024] S120, calculate the solar heating capacity based on the first environmental parameter, and determine the geothermal heat exchange path based on the second environmental parameter; wherein, the geothermal heat exchange path is determined by adjusting the burial depth of the underground heat exchange coil and the pipe diameter.

[0025] Solar heating capacity is the available thermal energy calculated based on solar radiation intensity, total collector area, and collector efficiency. It is used to characterize the energy supply capacity of the solar subsystem under current conditions. When determining the geothermal heat exchange path, the most suitable heat extraction depth can be selected from multiple preset burial depths, and a suitable pipe diameter can be matched to achieve efficient heat exchange.

[0026] In practice, based on the obtained soil temperatures at different depths, the layer with the highest temperature is selected as the current burial depth, and the burial depth is switched by a three-stage telescopic structure driven by an electric actuator. Simultaneously, according to the current heat load demand, the solenoid valve is controlled to switch the pipe diameter to 32 mm or 40 mm, thereby adjusting the flow rate and heat exchange area. This path selection strategy helps to increase the soil heat exchange per unit time and can mitigate localized heat or cold accumulation.

[0027] S130 calculates the coefficient of performance (COP) of the ground source heat pump based on the average soil temperature corresponding to the geothermal heat exchange path, and calculates the geothermal heating capacity based on the COP and the heat pump input power.

[0028] The average soil temperature refers to the weighted average temperature value within the depth range of the currently selected heat exchange path, used to characterize the initial temperature conditions on the heat source side during the operation of a ground source heat pump. A higher average soil temperature indicates more abundant underground thermal energy, which is more conducive to improving the energy efficiency of the heat pump.

[0029] The coefficient of performance, or COP, represents the amount of heat a ground source heat pump can provide per unit of electricity consumed. Its value increases with rising average soil temperature. The system estimates the COP under current operating conditions based on a pre-defined empirical model (i.e., the correlation between average soil temperature and COP). Then, combining this with the actual input power of the variable frequency ground source heat pump unit, the actual heat output provided by geothermal energy at this time is calculated.

[0030] S140, based on the degree of matching between heating demand and solar heating, determine the target heating ratio between solar heating and geothermal heating.

[0031] Heating demand refers to the total amount of heat required by users to maintain a set room temperature. Its magnitude depends on factors such as the number of rooms, heat dissipation area, indoor-outdoor temperature difference, and heat dissipation coefficient. The degree of matching between heating demand and solar heating capacity is also known as the proportion of solar heating capacity to heating demand.

[0032] In one example, when the ratio is higher than a set threshold (e.g., 60%), it indicates that solar energy can meet most or even all of the heating demand, and solar energy alone is prioritized for heating. When the ratio is between 40% and 60%, geothermal energy is activated to supplement heating, forming a synergistic mode. When it is lower than 40%, the contribution ratio of geothermal energy needs to be significantly increased, and emergency supplementary measures should be prepared. This ratio is only illustrative and not specifically limited; in practical applications, it can be adjusted adaptively. By determining the target heating ratio and dividing the operation into multiple operating ranges, the target heating ratio between solar and geothermal energy is dynamically set to ensure optimal energy utilization.

[0033] S150 determines the target heating device based on the target heating ratio to carry out coupled heating control of solar and geothermal energy.

[0034] The target heating system refers to the combination of equipment selected for operation based on the current optimal heating ratio. For example, under solar-dominated conditions, only the collector circulating water pump and the user circulating water pump are started, while the ground source heat pump is shut down to save electricity. When geothermal energy needs to be introduced, the variable frequency ground source heat pump unit is started, and its operating frequency and circulating water pump flow rate are adjusted to match its output heat with the target ratio. Under high load or extreme weather conditions, if geothermal energy is still insufficient, an electric auxiliary heating emergency module is further activated as a supplement. The controller automatically switches the operating mode based on the aforementioned calculation results, coordinating the operation of each subsystem to achieve the goal of on-demand heating and stable energy saving.

[0035] For ease of understanding, the heating control method for the coupling of solar and geothermal energy provided in this application will be described in detail below.

[0036] In one embodiment, the first environmental parameters include solar radiation intensity, collector outlet temperature, and outdoor ambient temperature. The calculation of solar heating capacity based on these first environmental parameters may, in specific implementation, include the following steps 1.1 to 1.4: Step 1.1: Calculate the total energy projected onto the collector surface per unit time based on the solar radiation intensity and the effective area of ​​the collector.

[0037] Solar radiation intensity refers to the amount of solar energy received per unit area, used to characterize the current level of usable solar energy. This solar radiation intensity is collected in real time by radiation sensors installed above the solar collector array. The effective area of ​​the solar collector refers to the actual light-receiving area involved in photothermal conversion, and is one of the system design parameters.

[0038] The total energy projected onto the collector surface per unit time is obtained by multiplying the solar radiation intensity by the effective area of ​​the collector.

[0039] Step 1.2: Calculate the temperature difference between the collector surface and the environment based on the outdoor ambient temperature and the collector outlet temperature.

[0040] The collector outlet temperature is the temperature of the heat transfer medium flowing out of the collector after being heated by the sun. The temperature difference between the collector surface and the external environment is determined by the temperature difference between the outdoor ambient temperature and the collector outlet temperature. A larger temperature difference indicates a higher risk of heat loss due to convection and radiation during collector operation. This temperature difference data is used to correct the collector efficiency under standard operating conditions to more accurately reflect the energy conversion capacity under actual operating conditions.

[0041] Step 1.3: Correct the standard heat collection efficiency based on the temperature difference data to obtain the actual heat collection efficiency under the current operating conditions.

[0042] Standard collector efficiency is the maximum energy conversion efficiency of a solar collector measured under standard laboratory conditions, typically a fixed value (e.g., 65%-75%). Actual collector efficiency, on the other hand, is a dynamic efficiency value considering heat loss under current complex environmental conditions. By correcting the standard collector efficiency using temperature difference data, when the temperature difference is small, heat loss is low, and the actual efficiency is close to the standard efficiency; when the temperature difference increases, the system automatically lowers the efficiency estimate to reflect the impact of heat dissipation. The resulting actual collector efficiency more accurately reflects the actual operating performance in the field.

[0043] Step 1.4: Calculate the solar heating capacity based on the actual heat collection efficiency, the total energy per unit time, and the continuous operating time under the current operating conditions.

[0044] The aforementioned continuous operating time refers to the length of time during which the current operating conditions remain stable, determined by periodic sampling by the control system. By multiplying the total energy per unit time by the actual heat collection efficiency, and then by the continuous operating time, the cumulative heat supply that the solar subsystem can actually provide during this period is finally obtained.

[0045] This method integrates multiple parameters, including solar radiation intensity, collector outlet temperature, and outdoor ambient temperature, to calculate the actual solar heating capacity under current operating conditions. It not only considers the input solar energy but also incorporates temperature difference factors to dynamically correct the collector efficiency, avoiding estimation biases caused by the fixed efficiency used in traditional methods. The obtained solar heating capacity more closely reflects actual operating conditions, improving the accuracy of energy dispatching and the precision of overall system energy efficiency control, providing a solid data foundation for the intelligent coupling of solar and geothermal energy.

[0046] Furthermore, the aforementioned second environmental parameter refers to the soil temperature at different depths along the geothermal heat exchange path. In specific implementation, determining the geothermal heat exchange path based on the second environmental parameter may include the following steps 2.1 to 2.4: Step 2.1: Determine the soil layer whose soil temperature is higher than a preset threshold among soil temperatures at multiple different depths.

[0047] Soil temperature at different depths refers to real-time soil temperature data collected by temperature sensors buried at multiple depths, such as 60 meters, 100 meters, and 150 meters, reflecting the vertical distribution characteristics of the underground temperature field. The preset threshold is a pre-defined minimum suitable heat extraction temperature (e.g., 10℃). Below this temperature, heat exchange efficiency decreases significantly and soil cold accumulation is easily exacerbated. This step compares the temperature values ​​at each depth measurement point with the preset threshold to screen out effective temperature zones that meet heating requirements. If multiple layers are above the threshold, the layer with the highest temperature is selected as the target heat extraction area to improve the energy efficiency of the ground source heat pump.

[0048] Step 2.2: Determine the burial depth of the underground heat exchange coil based on the soil strata.

[0049] Soil layers correspond to geological strata at different burial depths, and each layer is associated with a set of pre-defined underground heat exchange coil locations. Burial depth refers to the actual vertical depth at which the heat exchange coil is put into operation. This step, based on the high-temperature effective temperature zone identified in step 2.1, controls an electric actuator to drive a three-section telescopic structure for mechanical adjustment, switching the heat exchange coil to the corresponding depth (e.g., 60 meters, 100 meters, or 150 meters) to achieve dynamic adaptation to the soil temperature gradient. This method allows for flexible selection of the optimal heat exchange layer in different seasons or during long-term operation, avoiding localized temperature decay caused by continuous heat extraction from a single depth.

[0050] Step 2.3: Based on the current heating load demand data, control the solenoid valve to switch to the target pipe diameter.

[0051] Current heating load demand data characterizes the amount of heat required by users and is calculated from indoor temperature, set temperature difference, and heat dissipation area. The target pipe diameter refers to the pipe diameter selected based on the load; the system offers two pipe diameter options: 32 mm and 40 mm. When the load is low, the control system issues a command to close part of the flow channel, allowing the medium to flow through the smaller diameter (32 mm), increasing flow velocity, enhancing disturbance, and improving heat transfer intensity. When the load is high, it switches to the larger diameter (40 mm) to reduce flow resistance and ensure sufficient flow supply. This adjustment method achieves optimized matching between hydraulic conditions and heat load.

[0052] Step 2.4: Determine the geothermal heat exchange path based on the burial depth and the target pipe diameter.

[0053] A geothermal heat exchange path is a complete heat exchange channel formed by the selected burial depth and pipe diameter. This path not only determines the spatial depth of the heat extraction location but also affects the flow characteristics and heat exchange area of ​​the medium within the pipe. By combining the burial depth and pipe diameter, a complete heat exchange path decision is obtained and fed back to the controller for subsequent coefficient of performance calculations and heat pump control. Each path corresponds to a specific heat exchange capacity and energy consumption level, thus enabling fine-grained control.

[0054] This method achieves dynamic optimization of geothermal heat exchange paths by comprehensively monitoring soil temperature at multiple depths and assessing load demand. Utilizing an adjustable underground heat exchange coil structure, combined with electric actuators and solenoid valve control, the burial depth and pipe diameter can be flexibly adjusted, enabling the system to adapt to changing soil temperature fields and effectively mitigating heat exchange attenuation caused by long-term operation at a single layer. Simultaneously, matching appropriate pipe flow paths according to actual heating needs improves heat exchange response speed and energy utilization efficiency, enhancing the system's adaptability and stability under different operating conditions.

[0055] Furthermore, the calculation of the coefficient of performance (COP) of the ground source heat pump based on the average soil temperature corresponding to the geothermal heat exchange path, and the calculation of the geothermal heating capacity based on the COP and the heat pump input power, can, in specific implementation, include the following steps 3.1 to 3.3: Step 3.1: Weight the soil temperatures at multiple different depths corresponding to the geothermal heat exchange path to obtain equivalent temperature data that characterizes the thermal state of the geothermal heat exchange path.

[0056] The geothermal heat exchange path refers to the combination of burial depth and pipe diameter of the currently operational underground heat exchange coils, and the soil area involved is the actual spatial range where heat exchange occurs. Soil temperatures at multiple different depths can be collected in real time by temperature sensors pre-buried at locations such as 60 meters, 100 meters, and 150 meters.

[0057] In this step, the system does not simply take the arithmetic mean of the temperatures at all measuring points. Instead, it weights the data based on the degree of participation of each depth in the current heat exchange path and its thermal resistance characteristics. For example, if the current operating mode is dominated by a depth of 100 meters, the temperature of that layer has the highest weight. If it is a multi-layer collaborative heat exchange, the weights are allocated according to the proportion of heat contribution. This ultimately generates equivalent temperature data that accurately reflects the overall thermal level of the current underground heat exchange interface for subsequent performance evaluation.

[0058] Step 3.2: Estimate the energy conversion efficiency of the ground source heat pump under the current operating conditions based on the equivalent temperature data, and obtain the coefficient of performance of the ground source heat pump.

[0059] The coefficient of performance, or COP (coefficient of performance, ratio of heating capacity to electrical energy consumption), is used to measure the energy efficiency of a ground source heat pump. This step uses equivalent temperature data and a pre-set empirical model to estimate the energy conversion efficiency of the ground source heat pump under current operating conditions. This empirical model follows the principle that the higher the soil temperature, the more efficient the heat absorption on the evaporator side, and the relatively lower the compressor power consumption. For example, when the equivalent temperature is in a higher range (such as above 18°C), the COP value tends to the upper limit (reaching 5.5-6.0); when the temperature is lower, the estimate is automatically adjusted downwards. The resulting COP more closely reflects actual operating conditions, avoiding control deviations caused by using a fixed COP and improving energy dispatch accuracy.

[0060] Step 3.3: Obtain the actual electrical energy input of the ground source heat pump, calculate the effective heat output of the geothermal energy system based on the actual electrical energy input and the coefficient of performance, and determine the geothermal heating capacity based on the effective heat output.

[0061] Actual electrical energy input refers to the actual electrical power consumed by the variable frequency ground source heat pump unit per unit time. It is collected in real time by the built-in energy metering module and reflects the current energy consumption level of the equipment. Effective heat is the usable heat energy released to the outside by the geothermal energy system after extracting and raising the temperature from the soil through the heat pump cycle. Its value is equal to the actual electrical energy input multiplied by the current coefficient of performance.

[0062] This step combines the actual electrical energy input of the ground source heat pump with the real-time estimated COP value to calculate the actual heating capacity that the geothermal energy subsystem can provide at this time, and determines the geothermal heating capacity. This determination of the geothermal heating capacity comprehensively considers external heat source conditions, equipment operating status, and energy conversion efficiency, providing an accurate basis for subsequent decisions on the coupling ratio of solar and geothermal energy.

[0063] This method obtains more representative equivalent temperature data by weighting the soil temperature at multiple depths along the geothermal heat exchange path, thus improving the accuracy of heat source status perception. Based on this, the performance coefficient of the ground source heat pump is dynamically estimated using an empirical model, and the geothermal heating capacity is accurately calculated by combining actual electrical energy input. Compared to traditional methods that use fixed parameters or single-point temperature estimation, this significantly improves the scientific rigor of energy prediction and the adaptability of control strategies, helping to reduce overall energy consumption and enhance long-term operational stability.

[0064] Furthermore, the above-mentioned determination of the target heating ratio between solar heating and geothermal heating based on the matching degree between heating demand and solar heating capacity can, in specific implementation, include the following steps 4.1 to 4.5: Step 4.1: Calculate the heating demand based on the user-set temperature, actual indoor temperature, number of rooms, and heat dissipation area.

[0065] User-set temperature refers to the desired indoor comfort temperature, typically set between 18°C ​​and 22°C. Actual indoor temperature is collected by distributed temperature sensors installed in each room, reflecting the current room temperature level. Heat exchange area refers to the sum of the effective heat exchange areas of the heating terminals (such as underfloor heating coils or radiators) in each room.

[0066] By combining the above parameters with the heat dissipation coefficient model, the total heat required to maintain the set temperature, i.e. the heating demand, can be calculated, thereby dynamically reflecting the actual heat consumption intensity on the user side.

[0067] Step 4.2: Divide the heating phase into multiple intervals based on the ratio between solar heating heat and heating demand.

[0068] The solar heating capacity refers to the effective heat that the current solar subsystem can provide, calculated in the previous steps. The ratio of solar heating capacity to heating demand characterizes the contribution of solar energy to the overall heating task. This ratio divides the operating conditions into several preset heating phase intervals; for example, when the ratio is above 60%, it is a solar-dominated zone; between 40% and 60%, it is a coordinated heating zone; and below 40%, it is a geothermal-dominated zone. Each interval corresponds to different control logic and equipment start-up and shutdown strategies for hierarchical intelligent regulation.

[0069] Step 4.3: When the proportion of solar heating is higher than the preset proportion, determine the first heating proportion of the solar system and the second heating proportion of the geothermal system.

[0070] The preset ratio is a pre-defined threshold (e.g., 60%) used to identify whether solar energy has the dominant heating capacity. When the proportion of solar heating exceeds this threshold, it indicates that solar energy resources are sufficient, and the system enters a priority utilization mode. At this time, the controller sets the solar system to undertake the main heating task, that is, the first heating ratio is high (close to or equal to 100%), while the second heating ratio of the geothermal energy system is adjusted to the minimum, only maintaining a standby or low-level operation state to avoid unnecessary equipment startup and reduce power consumption.

[0071] Step 4.4: When the proportion of solar heating is lower than the preset proportion, the second heating proportion is increased and the first heating proportion is decreased accordingly.

[0072] When solar heating is insufficient to meet most heating demands, the system determines that auxiliary or supplementary power sources must intervene. At this point, as solar energy contribution decreases, the controller automatically reduces the primary heating contribution of the solar system and simultaneously increases the secondary heating contribution of the geothermal system. For example, in areas with coordinated heating, the geothermal system begins operation, undertaking 30%-60% of the heating task; in areas primarily supplied by geothermal energy, its heating contribution further increases to over 70%, ensuring continuous and stable overall heating. This dynamic adjustment process is accomplished collaboratively by a variable frequency ground source heat pump and a circulating water pump.

[0073] Step 4.5: Determine the target heating ratio between solar heating and geothermal heating based on the dynamically adjusted first heating ratio and the scheduled second heating ratio.

[0074] The target heating ratio is the final determined dual-energy synergistic output ratio based on the current operating range, used to characterize the distribution relationship between solar and geothermal energy under current operating conditions. For example, maintaining a "high-solar-low-geothermal" mode under sunny weather conditions, and switching to a "low-solar-high-geothermal" mode during cloudy or rainy weather or at night to optimize energy utilization.

[0075] This method accurately calculates heating demand by comprehensively considering user-set temperature, actual room temperature, and building thermal characteristics. It then divides the system into multiple operating zones based on the matching degree of solar heating capacity, achieving dynamic and precise adjustment of the heating ratio. The contribution weights of solar and geothermal energy are automatically adjusted according to different operating conditions, maximizing the utilization of clean solar energy resources while ensuring the stability and responsiveness of the heating system. Compared to traditional fixed switching logic, this solution avoids frequent start-stop cycles and energy waste, improving overall system energy efficiency and user experience, and providing a reliable control path for the intelligent operation of new energy coupled heating systems.

[0076] Furthermore, the above-mentioned determination of the target heating device based on the target heating ratio for coupled heating control of solar and geothermal energy may include the following steps 5.1 and 5.2 in specific implementation: Step 5.1: Start or stop the target water pump in the solar collector circulation loop according to the target heating ratio, and adjust the operating frequency of the ground source heat pump and the flow rate of the geothermal side circulation water pump.

[0077] The target water pump in the solar thermal collector circulation loop refers to the circulating water pump connecting the photovoltaic-thermal integrated collector and the two-stage hot water storage tank, which drives the heat transfer medium to complete heat transfer. When the proportion of solar energy in the target heating ratio is high, the system starts the water pump to form a complete heat collection cycle; when the contribution of solar energy is insufficient or there is no input, the pump is turned off to reduce ineffective energy consumption.

[0078] The operating frequency of the ground source heat pump is adjusted by a variable frequency controller to regulate the compressor's operating speed, thereby changing the heating output capacity and continuously adjusting it from partial load to full load. The flow rate of the geothermal circulating water pump is dynamically adjusted according to actual heat exchange demand to ensure that the medium flow rate in the underground heat exchange coils matches the current heat load. This process, through coordinated control of pump start-up and shutdown, frequency regulation, and flow matching, enables each device to accurately respond to the target heating ratio, achieving a dynamic balance between energy supply and demand.

[0079] Step 5.2: Control the state of the internal flow guiding structure of the two-stage hot water storage tank to supply hot water from the high-temperature zone to the user end, and use hot water from the low-temperature zone for preheating supplementation, so as to carry out coupled heating control of solar energy and geothermal energy.

[0080] The two-stage hot water storage tank is an energy storage device with an upper and lower tiered structure. The upper tier is a high-temperature zone (45℃-55℃), primarily storing high-temperature hot water directly heated by solar energy or boosted by a heat pump. The lower tier is a low-temperature zone (30℃-40℃), used to store return water from geothermal preheating or low-grade heat energy. The internal flow guiding structure refers to the temperature isolation plates and flow guiding pipe system installed inside the tank, used to maintain the stratification of hot and cold water, prevent mixing, and guide water of different temperature levels to flow as needed. When the system supplies heat to users, the controller controls the valve opening path, prioritizing water intake from the high-temperature zone to supply the user end, ensuring heating quality. Simultaneously, the low-temperature water returning from the user side is guided to the lower tier as preheating water for the geothermal heat exchange system, increasing its initial temperature and reducing subsequent heating energy consumption. This tiered utilization method achieves direct supply of high-grade heat energy and tiered utilization of low-grade heat energy, improving overall thermal efficiency.

[0081] This approach achieves precise coupling of solar and geothermal energy through the coordinated control of the equipment layers driven by the target heating ratio. It flexibly starts and stops water pumps and adjusts heat pump frequency and circulation flow based on energy contribution levels, avoiding equipment idling and energy waste, and improving system response accuracy and energy efficiency. Simultaneously, combined with the internal flow control of the two-stage hot water storage tank, it fully leverages its tiered heat storage advantages, achieving an orderly energy flow with priority supply of high-temperature hot water and tiered preheating of low-temperature return water. This control strategy not only enhances heating stability but also significantly reduces the operating load and power consumption of the ground source heat pump, extending equipment lifespan.

[0082] Furthermore, in an optional implementation, the above method further includes steps 6.1 to 6.4: Step 6.1: Continuously monitor indoor temperature change data at multiple locations on the user terminal.

[0083] Multiple user-end locations refer to different rooms or functional areas served by the system. Each area is equipped with an independent temperature sensor, forming part of a distributed sensor network. Indoor temperature change data consists of real-time temperature values ​​collected and uploaded from each measuring point, along with their trends over time. This step acquires dynamic room temperature data for the entire house or multiple areas through high-frequency sampling (e.g., once every 30 seconds), comprehensively understanding the spatial distribution and temporal response characteristics of the heating effect, thereby identifying whether there is localized overheating or insufficient heating.

[0084] Step 6.2: Based on historical operating data and indoor temperature change data, predict the heating load fluctuation in the next stage.

[0085] Historical operational data can include information such as the system's heating output, solar energy input intensity, outdoor ambient temperature, water pump operating status, and corresponding room temperature response curves over the past hour. Heating load fluctuations refer to the potential trend of heat demand changes on the user side within a future period (such as the next 15-30 minutes). This step utilizes the load prediction algorithm built into the intelligent coupling controller, combined with the current rate of room temperature change, heat dissipation characteristics, and weather trends, to analyze thermal inertia response patterns and predict whether future conditions such as delayed temperature rise or accelerated temperature drop will occur. For example, when a rapid drop in outdoor temperature and slow indoor temperature rise are detected, a heating shortage can be anticipated in advance, allowing for proactive increases in energy reserves.

[0086] Step 6.3: Adjust the geothermal heat exchange path or change the target heating ratio based on the predicted heating load fluctuations.

[0087] If a significant increase in heating load is predicted in the next phase, a switch to a geothermal heat exchange path with higher heat exchange capacity (such as choosing a deeper burial layer or a larger pipe diameter) should be initiated in advance to enhance the preparedness of the ground source side. At the same time, the proportion of geothermal energy in the target heating ratio should be appropriately increased to avoid response delays caused by temporary start-ups and shutdowns. Conversely, if a decrease in load is predicted, the solar-dominated mode should be restored first to reduce electricity consumption.

[0088] Step 6.4: When a fault is detected in the main heating equipment, switch to emergency heating mode and send a fault alarm signal to the remote monitoring terminal.

[0089] In one implementation, the main heating equipment may include core components such as a variable frequency ground source heat pump unit, a collector circulating water pump, and key control modules. The system determines its normal operation by monitoring parameters such as operating current, temperature feedback, and communication status in real time. Once an anomaly is detected (such as heat pump shutdown, no temperature rise in the collector, or circulation interruption), the controller immediately identifies it as an equipment failure and automatically activates the emergency heating mode: shutting down the main circuit, activating the electric auxiliary heating emergency module, and directly heating the lower layer of the two-stage hot water storage tank or the user's circulation circuit to ensure that the user's temperature does not fall below the set lower limit (e.g., 20°C). Simultaneously, the fault type, occurrence time, and location information are pushed to the remote monitoring terminal of maintenance personnel via the communication module for timely response and repair.

[0090] This method continuously collects multi-point room temperature data and combines it with historical operating patterns to predict load fluctuations, avoiding the temperature fluctuations and increased energy consumption caused by traditional passive responses. Based on the prediction results, it optimizes geothermal heat exchange paths and heating ratio allocation in advance, enhancing the initiative and accuracy of energy dispatch. Simultaneously, through fault detection and emergency heating, it can maintain basic heating functions even in the event of main equipment failure, and provides remote alarms, effectively preventing heating interruptions and improving user comfort and system safety.

[0091] In summary, the solar and geothermal energy coupled heating control method provided in this application, through multi-dimensional sensing monitoring and dynamic coupling algorithms, achieves intelligent coordinated allocation of solar and geothermal energy, significantly improving the overall energy efficiency of the system. The adoption of adjustable underground heat exchange coils and a two-stage hot water storage tank structure optimizes the soil heat exchange path and reduces heat loss, effectively mitigating the heat exchange attenuation problem caused by long-term operation. Combined with a distributed temperature control strategy based on load forecasting, user comfort is greatly improved. The addition of an electric auxiliary heating emergency module ensures heating continuity under extreme operating conditions, significantly enhancing system reliability.

[0092] This application also provides a heating control system that couples solar and geothermal energy, see [link to relevant documentation]. Figure 2As shown, the system includes an energy harvesting unit, an underground heat exchange unit, an energy storage unit, an energy conversion unit, a sensing and monitoring unit, a control unit, a circulation drive unit, and an emergency heating unit. Specifically, 1. Energy Harvesting Unit The energy harvesting unit is connected to the energy storage unit via pipelines to collect solar thermal energy and transmit it to the storage unit. This energy harvesting unit refers to a device module used to collect solar radiation energy and convert it into usable heat energy; its core component is a photovoltaic-thermal integrated collector array. This collector not only possesses traditional solar thermal collection functions, converting solar radiation energy into a high-temperature heat transfer medium (such as a heat transfer fluid or water), but also integrates a photovoltaic power generation layer, which can generate direct current (DC) electricity while collecting heat energy, powering the system control unit and other low-power devices, thus achieving energy self-sufficiency.

[0093] In this embodiment, the energy harvesting unit consists of 8 to 16 sets of photovoltaic-thermal integrated collectors, each with an area of ​​approximately 2.5 square meters, for a total collector area of ​​20–40 square meters. These collectors are installed on building rooftops or in open areas, facing due south with an inclination angle adapted to the local latitude to maximize the reception of solar radiation throughout the year. The collector outlets are connected to the upper high-temperature zone of the energy storage unit via insulated pipes, forming an independent heat collection circulation loop. When the solar radiation intensity exceeds 80 W / m², the heat collection circulation water pump is activated, transporting the high-temperature medium, after absorbing heat, to the energy storage unit for storage or direct heating.

[0094] Key performance parameters of this unit include: a heat collection efficiency of 65%–75%, which is much higher than that of traditional flat-plate or vacuum tube collectors; and a photoelectric conversion efficiency of approximately 12%–15%, which can meet the daily power supply needs of the controller, sensor network and communication modules, reducing dependence on the external power grid.

[0095] 2. Underground heat exchange unit The underground heat exchange unit is located below ground level, with its inlet and outlet connected to the energy conversion unit via pipelines. It is used to extract or release heat energy from the soil. The underground heat exchange unit refers to a heat exchange structure buried below ground level, used to extract heat energy from the shallow, constant-temperature zone of the soil (in winter) or to release excess heat into the soil (in summer cooling conditions). It is a core component of geothermal energy utilization. It exchanges heat with the surrounding soil through a circulating medium (usually an antifreeze solution) in closed pipelines.

[0096] In this embodiment, the underground heat exchange unit adopts an adjustable underground heat exchange coil with 3–6 independent loops. The burial depth of each loop can be switched between three levels: 60m, 100m, and 150m. The pipe diameter can be automatically adjusted between 32mm and 40mm specifications via a solenoid valve. This three-section telescopic structure, combined with an electric actuator, can select the optimal burial depth and flow cross-section based on real-time collected soil temperatures at different depths, thereby avoiding low-temperature areas, matching the optimal heat exchange temperature difference, and significantly alleviating the problem of cold soil accumulation caused by long-term heat extraction.

[0097] For example, in the later stages of a continuous heating season, if the soil temperature at a depth of 100m drops below 10℃ while it remains above 13℃ at 150m, the control system automatically switches to a deeper burial path and increases the pipe diameter to improve flow rate and enhance the heat exchange capacity of the deep soil. This design effectively reduces the soil heat exchange attenuation rate, with an average annual attenuation controlled within 2%, far superior to the 5%–8% of existing technologies.

[0098] 3. Energy storage unit The output of the energy conversion unit is connected to the energy storage unit via pipeline. This process heats the low-temperature heat energy from the underground heat exchange unit before inputting it into the energy storage unit. The energy storage unit is a device used to store and manage thermal energy. Its main function is to store excess heat when solar energy is abundant and release heat when solar energy is insufficient to balance supply and demand.

[0099] In this embodiment, the energy storage unit adopts a two-stage hot water storage tank, with a single unit having an effective volume of 800–2000L. It is equipped with a temperature zoning device, namely horizontally arranged heat-insulating baffles, which physically divide the tank into an upper high-temperature zone (45–55℃) and a lower low-temperature preheating zone (30–40℃). The high-temperature zone is mainly used to receive hot water directly heated by solar energy and the heated heat energy output from the heat pump, specifically for end-user heating. The low-temperature zone is used to temporarily store the lower-temperature hot water initially heated by the ground source heat pump, serving as a preheating source for the next stage of heating or mixed heating.

[0100] The water tank is equipped with a flow guide pipe and a water distributor to ensure even water distribution and prevent heat loss caused by violent mixing of hot and cold water. Furthermore, the outer shell of the water tank uses polyurethane foam insulation material with a thermal insulation coefficient of over 0.95, further reducing heat loss compared to existing technologies. This layered heat storage structure enables a tiered utilization mode of direct high-temperature supply and low-temperature preheating, improving overall thermal energy utilization efficiency.

[0101] 4. Energy conversion unit The energy storage unit has a layered structure with internal temperature zoning devices to form a high-temperature heat storage zone and a low-temperature preheating zone, and controllable heat exchange between the two zones is achieved through an internal flow guiding structure. The energy conversion unit refers to the energy-enhancing device that upgrades low-temperature heat energy into usable high-temperature heat energy, mainly a variable frequency ground source heat pump unit. Based on the reverse Carnot cycle principle, this unit uses a compressor to raise the low-temperature heat energy (typically 8–15℃) from the underground heat exchange unit to 45–55℃ to meet heating needs.

[0102] In this embodiment, the energy conversion unit employs a variable frequency ground source heat pump unit with a rated heating capacity of 15–30 kW. Its COP (coefficient of performance) under ideal operating conditions can reach 4.8–6.0, significantly higher than the 3.0–4.5 of existing technologies. In a specific example, the COP value exhibits a linear relationship with the average soil temperature: COPground ≈ 0.08 × Ttemperature 土平均 +3.2. Therefore, the control system prioritizes heat extraction from the higher-temperature soil layer to maintain high-efficiency operation.

[0103] The input end of the heat pump unit is connected to the outlet of the underground heat exchange unit, and the output end is connected to the upper high-temperature zone of the two-stage hot water storage tank through pipelines to realize heat energy injection. Its operating frequency (0–50Hz) is dynamically adjusted by the control unit according to the load demand to avoid the impact and increased energy consumption caused by frequent start-stop.

[0104] 5. Sensing and monitoring unit The sensing and monitoring unit includes multiple distributed sensors, which are respectively arranged in the energy harvesting unit, underground heat exchange unit, energy storage unit, user terminal and external environment. They are used to collect solar radiation intensity, ambient temperature, heat collection medium temperature, soil temperature at different depths, energy storage medium temperature, actual temperature on the user side and flow parameters in real time, and transmit the collected data to the control unit.

[0105] The sensing and monitoring unit refers to a distributed set of sensors located at key nodes of the system, used to collect environmental, equipment status and operating parameters in real time, providing a data foundation for intelligent control.

[0106] In this embodiment, the sensing and monitoring unit includes: two radiation sensors installed in an open outdoor area for real-time measurement of solar radiation intensity I (unit: W / m²); and sensors respectively arranged at the collector outlet (T1) and soil at different depths (T). 土1 T 土2 T 土3 ), two-stage water tank, upper and lower layers (T) 上 T 下 ), user-side heatsink (T) 用1 ~T 用nThe system includes 12–18 temperature sensors for the ambient space (T0); and 4 flow sensors installed on the main pipelines of the heat collection circulation, geothermal circulation, and user heating to monitor the medium velocity and instantaneous flow rate. All sensors transmit data to the control unit via RS485 bus. The sampling period can be set to 30 seconds, and a built-in filtering algorithm is used to remove abnormal jump values ​​to ensure data reliability.

[0107] 6. Control Unit The control unit is electrically connected to the energy harvesting unit, energy conversion unit, underground heat exchange unit, energy storage unit, sensing and monitoring unit, and circulation drive unit. It receives the acquisition signals from the sensing and monitoring unit, calculates the current total heating load demand and the ratio of heat that can be provided by solar energy to heat that can be provided by geothermal energy according to the preset algorithm, and generates control commands to output to the corresponding execution components.

[0108] In this embodiment, the control unit refers to an embedded industrial controller, which is pre-configured with the solar-geothermal dynamic coupling algorithm used in this application embodiment. The algorithm's workflow is as follows: 1) Calculate the total heating load Q. 总 : According to the user-set temperature T 设 (e.g., 20℃), measured average user-side temperature T 用平均 Given the number of rooms n and their total heat dissipation area S (unit: m²), and using the empirical heat dissipation coefficient k (values ​​ranging from 0.03 to 0.05 kW / (m²·℃)), calculate the required heating power: Q 总 =k×S×(T 设 -T 用平均 ) 2) Predict the solar thermal capacity Q 太 : Based on the current solar radiation intensity I and the total collector area S 集 Heat collection efficiency η 太 And the time factor τ (hours), to estimate the solar thermal energy available in the current period: Q 太 =I×S 集 ×η 太 ×τ 3) Assess the geothermal energy supply capacity Qgeothermal: Based on average soil temperature T 土平均 Calculate the COP of a heat pump 地 Combined with the heat pump input power P 地 The geothermal contribution was determined as follows: Q 地 =COP 地 ×P 地 Among them, COP 地 The coefficient of performance of a heat pump (derived from soil temperature T) 土平均 Calculate: COP 地 =0.08×T 土平均 +3.2), P 地 Input power of the heat pump (unit: kW).

[0109] Coupled controller according to Q 太 With Q 总 The ratio of Q to the circulating water pump flow rate V (0.5-2.0 m³ / h) is dynamically adjusted by regulating the heat pump operating frequency f (0-50 Hz) and the circulating water pump flow rate V (0.5-2.0 m³ / h). 太 +Q 地 =Q 总 And Q 太 Prioritize a proportion of ≥60% (maximizing the utilization of solar energy).

[0110] 4) Dynamically allocate heating ratio: The controller formulates a differentiation strategy based on the ratio of Qtotal to Qminimum: When Q 太 ≥Q 总 When only the solar collector circulating water pump is activated, solar thermal energy is directly input into the upper layer of the hot water storage tank and then supplied to the user through the user's circulating water pump.

[0111] When 40%≤Q 太 总 When starting the heat pump unit, adjust the burial depth of the underground heat exchange coil (select the location with the highest burial depth in T soil) and the pipe diameter. After extracting geothermal energy and heating it up, it is input into the hot water storage tank along with solar thermal energy. The two-stage water tank achieves heat exchange through internal guide plates to maintain a stable upper temperature.

[0112] When Q 太 <40%Q 总 At this time: the heat pump operates at full load, and the electric auxiliary heating emergency module is activated to supplement heat to the hot water storage tank, ensuring that the temperature above T is ≥45℃.

[0113] In addition, the control unit introduces a load prediction factor based on the PID control principle, which uses historical data trends from the previous hour to predict future load changes, adjusts the water pump flow and heat pump frequency in advance, and reduces response delay and fluctuations.

[0114] 7. Cyclic Drive Unit The circulation drive unit includes multiple adjustable-speed water pumps, which are respectively installed in the energy harvesting loop, the underground heat exchange loop, and the user heating loop. Controlled by a control unit, the flow rate of the medium in each loop is dynamically adjusted according to the heating load. The circulation drive unit refers to the power device that drives the heat medium to circulate between the subsystems; its performance directly affects heat transfer efficiency and energy consumption. ​

[0115] In this embodiment, the circulation drive unit comprises three sets of variable frequency water pumps: a heat collection circulating water pump located between the energy harvesting unit and the energy storage unit to drive the circulation of high-temperature medium; a geothermal circulating water pump connecting the underground heat exchange unit and the energy conversion unit to transport low-temperature heat exchange medium; and a user circulating water pump connecting the energy storage unit and the user terminal to realize heat distribution.

[0116] All water pumps are variable frequency speed control type, with a flow range of 0.5–2.0 m³ / h, and are controlled by the control unit. The controller dynamically adjusts the speed of each pump according to real-time load demand to achieve on-demand water supply and avoid pump power waste caused by excessive circulation. For example, during low-load periods at night, the flow rate of the user's circulating water pump is automatically reduced to the minimum safe value to maintain stable system operation.

[0117] 8. Emergency heating unit The emergency heating unit is installed in the energy storage unit or the user's heating circuit and is electrically connected to the control unit. When the main energy supply capacity is insufficient or the system fails, it is activated according to the control unit's instructions to supplement the system with heat energy.

[0118] In this embodiment, the emergency heating unit is an electric auxiliary heating module with a rated power of 3–5kW, installed inside a two-stage hot water storage tank or at the front end of the user's heating circuit. It is electrically connected to the control unit and is automatically triggered when any of the following conditions occur: continuous cloudy or rainy days causing solar energy to be unable to meet the minimum heating demand, heat pump unit failure and shutdown, collector damage or circulation interruption, and user-side temperature remaining below the set value by more than 1°C for more than 5 minutes.

[0119] Once the emergency mode is activated, the electric auxiliary heating module will start immediately, prioritizing the heating temperature in core areas (such as bedrooms and living rooms) to be no lower than 20°C. At the same time, the control unit will issue an audible and visual alarm and send fault information to the operation and maintenance platform through the wireless communication module to remind manual intervention for maintenance.

[0120] The energy architecture of solar energy, geothermal energy, and electric auxiliary heating greatly enhances the system's ability to cope with complex operating conditions and significantly extends the mean time between failures (MTBF).

[0121] Based on the specific component structure of the above system, the solar and geothermal coupled heating control system of the present invention, in actual operation, see [reference]. Figure 3 As shown, the following process can be adopted: 1. Startup Phase: After the system is powered on, the sensing and monitoring unit begins to collect initial environmental and equipment parameters; 2. Data transmission and processing stage: All data is uploaded to the control unit via RS485 bus for filtering and normalization. 3. Coupled Decision Stage: The control unit runs a dynamic coupling algorithm to comprehensively determine the energy combination strategy to be adopted and the equipment operating parameters; 4. Output execution phase: Control commands are sent to the energy harvesting unit, energy conversion unit, and cycle drive unit to start the corresponding equipment; 5. Feedback and adjustment phase: Feedback data is collected again every 30 seconds. If the indoor temperature deviation exceeds ±0.5℃, the control strategy is re-optimized. If an abnormal operating condition is detected, the system is switched to emergency mode.

[0122] This system, through the aforementioned technical means, including dynamic coupling algorithms and adjustable heat exchange structures, improves solar energy utilization, reduces soil heat exchange attenuation rate, and lowers annual operating energy consumption. By combining distributed sensor networks with load forecasting algorithms, it reduces the range of indoor temperature fluctuations. At the same time, the addition of an emergency module avoids heating interruption problems, and the system's mean time between failures (MTBF) is extended. It is suitable for various scenarios such as residential and commercial buildings, combining economy and practicality.

[0123] This application also provides an electronic device, such as... Figure 4 The diagram shows the structure of the electronic device 100, which includes a processor 41 and a memory 40. The memory 40 stores computer-executable instructions that can be executed by the processor 41. The processor 41 executes the computer-executable instructions to implement any of the above-mentioned solar and geothermal energy coupling heating control methods.

[0124] exist Figure 4 In the illustrated embodiment, the electronic device further includes a bus 42 and a communication interface 43, wherein the processor 41, the communication interface 43, and the memory 40 are connected via the bus 42.

[0125] The memory 40 may include high-speed random access memory (RAM) or non-volatile memory, such as at least one disk storage device. Communication between this system network element and at least one other network element is achieved through at least one communication interface 43 (which can be wired or wireless), such as the Internet, wide area network, local area network, metropolitan area network, etc. The bus 42 may be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. The bus 42 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 4 The symbol is represented by a single double-headed arrow, but this does not mean that there is only one bus or one type of bus.

[0126] Processor 41 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of processor 41 or by software instructions. Processor 41 can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of this application can be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in the memory. The processor 41 reads the information in the memory and, in conjunction with its hardware, completes the steps of the solar and geothermal energy coupling heating control method of the aforementioned embodiment.

[0127] This application also provides a computer-readable storage medium storing computer-executable instructions. When these computer-executable instructions are called and executed by a processor, they cause the processor to implement the above-described heating control method that couples solar and geothermal energy. For specific implementation details, please refer to the foregoing method embodiments, which will not be repeated here.

[0128] The computer program product of the solar and geothermal energy coupled heating control method, system and electronic device provided in the embodiments of this application includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the methods described in the preceding method embodiments. For specific implementation, please refer to the method embodiments, which will not be repeated here.

[0129] Unless otherwise specifically stated, the relative steps, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application.

[0130] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion 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 this application. 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.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A heating control method coupling solar and geothermal energy, characterized in that, Includes the following steps: Obtain a first environmental parameter characterizing the intensity of solar energy input and a second environmental parameter characterizing the state of the underground heat source; The solar heating capacity is calculated based on the first environmental parameter, and the geothermal heat exchange path is determined based on the second environmental parameter; wherein the geothermal heat exchange path is determined by adjusting the burial depth of the underground heat exchange coil and the pipe diameter. The performance coefficient of the ground source heat pump is calculated based on the average soil temperature corresponding to the geothermal heat exchange path, and the geothermal heating capacity is calculated based on the performance coefficient and the heat pump input power. Based on the degree of matching between heating demand and solar heating capacity, a target heating ratio between solar heating capacity and geothermal heating capacity is determined. The target heating device is determined based on the target heating ratio to carry out coupled heating control of solar and geothermal energy.

2. The heating control method for coupling solar and geothermal energy according to claim 1, characterized in that, The first environmental parameter includes solar radiation intensity, collector outlet temperature, and outdoor ambient temperature; Calculating the solar heating capacity based on the first environmental parameter includes: Based on the solar radiation intensity and the effective area of ​​the collector, calculate the total energy projected onto the collector surface per unit time. Calculate the temperature difference between the collector surface and the environment based on the outdoor ambient temperature and the collector outlet temperature. The standard heat collection efficiency is corrected based on the temperature difference data to obtain the actual heat collection efficiency under the current operating conditions. The solar heating capacity is calculated based on the actual heat collection efficiency, the total energy per unit time, and the continuous operating time under the current conditions.

3. The heating control method for coupling solar and geothermal energy according to claim 1, characterized in that, The second environmental parameter is the soil temperature at different depths along the geothermal heat exchange path; Determining the geothermal heat exchange path based on the second environmental parameter includes: Determine the soil layer whose soil temperature is higher than a preset threshold among soil temperatures at multiple different depths; The burial depth corresponding to the underground heat exchange coil is determined based on the soil layer. Based on the current heating load demand data, control the solenoid valve to switch to the target pipe diameter; The geothermal heat exchange path is determined based on the burial depth and the target pipeline diameter.

4. The heating control method for coupling solar and geothermal energy according to claim 1, characterized in that, The coefficient of performance (COP) of the ground source heat pump is calculated based on the average soil temperature corresponding to the geothermal heat exchange path, and the geothermal heating capacity is calculated based on the COP and the heat pump input power, including: The soil temperatures at multiple different depths corresponding to the geothermal heat exchange path are weighted to obtain equivalent temperature data that characterizes the thermal state of the geothermal heat exchange path. Based on the equivalent temperature data, the energy conversion efficiency of the ground source heat pump under the current operating conditions is estimated, and the coefficient of performance of the ground source heat pump is obtained. The actual electrical energy input of the ground source heat pump is obtained, the effective heat output of the geothermal energy system is calculated based on the actual electrical energy input and the coefficient of performance, and the geothermal heating capacity is determined based on the effective heat output.

5. The heating control method for coupling solar and geothermal energy according to claim 1, characterized in that, Based on the degree of matching between heating demand and the solar heating capacity, a target heating ratio between solar heating capacity and geothermal heating capacity is determined, including: Heating demand is calculated based on user-set temperature, actual indoor temperature, number of rooms, and heat dissipation area. The heating phases are divided into multiple intervals based on the ratio between the solar heating capacity and the heating demand. When the proportion of solar heating is higher than a preset proportion, a first heating proportion of the solar system and a second heating proportion of the geothermal system are determined. When the proportion of solar heating is lower than a preset proportion, the second heating proportion is increased accordingly, and the first heating proportion is decreased. The target heating ratio between solar heating and geothermal heating is determined based on the dynamically adjusted first heating ratio and the scheduled second heating ratio.

6. The heating control method for coupling solar and geothermal energy according to claim 1, characterized in that, The target heating device is determined based on the target heating ratio to perform coupled heating control of solar and geothermal energy, including: Start or stop the target water pump in the solar collector circulation loop according to the target heating ratio, and adjust the operating frequency of the ground source heat pump and the flow rate of the geothermal side circulation water pump. The system controls the flow distribution structure inside the two-stage hot water storage tank to supply hot water from the high-temperature zone to the user end, while hot water from the low-temperature zone is used for preheating and supplementation, thus enabling coupled heating control of solar and geothermal energy.

7. The heating control method for coupling solar and geothermal energy according to claim 1, characterized in that, Also includes: Continuously monitor indoor temperature changes at multiple locations on the user's device; Based on historical operating data and indoor temperature change data, predict the fluctuation of heating load in the next stage. Adjust the geothermal heat exchange path or change the target heating ratio based on the predicted heating load fluctuations. When a fault is detected in the main heating equipment, the system switches to emergency heating mode and sends a fault alarm signal to the remote monitoring terminal.

8. A heating control system coupling solar and geothermal energy, characterized in that, It includes an energy harvesting unit, an underground heat exchange unit, an energy storage unit, an energy conversion unit, a sensing and monitoring unit, a control unit, a circulation drive unit, and an emergency heating unit; The energy harvesting unit is connected to the energy storage unit via a pipeline, and is used to harvest solar thermal energy and transmit it to the energy storage unit; The underground heat exchange unit is located below ground level, and its inlet and outlet are connected to the energy conversion unit through pipelines, respectively, for extracting or releasing heat energy from the soil; The output end of the energy conversion unit is connected to the energy storage unit through a pipeline, and is used to heat up the low-temperature heat energy from the underground heat exchange unit before inputting it into the energy storage unit. The energy storage unit has a layered structure and is equipped with a temperature partitioning device to form a high-temperature heat storage zone and a low-temperature preheating zone, and achieves controllable heat exchange between the two zones through an internal flow guiding structure. The sensing and monitoring unit includes multiple distributed sensors, which are respectively arranged in the energy harvesting unit, underground heat exchange unit, energy storage unit, user terminal and external environment. They are used to collect solar radiation intensity, ambient temperature, heat collection medium temperature, soil temperature at different depths, energy storage medium temperature, actual temperature on the user side and flow parameters in real time, and transmit the collected data to the control unit. The control unit is electrically connected to the energy harvesting unit, energy conversion unit, underground heat exchange unit, energy storage unit, sensing and monitoring unit and circulation drive unit. It receives the acquisition signals from the sensing and monitoring unit, calculates the current total heating load demand and the ratio of heat that solar energy can provide to heat that geothermal energy can provide according to a preset algorithm, and generates control commands to output to the corresponding execution components. The circulating drive unit includes multiple adjustable speed water pumps, which are respectively installed in the energy harvesting loop, the underground heat exchange loop and the user heating loop. They are controlled by the control unit and dynamically adjust the medium flow rate of each loop according to the heating load. The emergency heating unit is installed in the energy storage unit or the user's heating circuit and is electrically connected to the control unit. When the main energy supply capacity is insufficient or the system fails, it is activated according to the control unit's instructions to supplement the system with heat energy.

9. An electronic device, characterized in that, The device includes a processor and a memory, the memory storing computer-executable instructions that can be executed by the processor, the processor executing the computer-executable instructions to implement the solar and geothermal energy coupling heating control method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when invoked and executed by a processor, cause the processor to implement the solar and geothermal energy coupling heating control method according to any one of claims 1 to 7.

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