Photovoltaic heat supply anti-freezing system, method and device

Abstract

The invention provides a photovoltaic heat supply anti-freezing system and method, and relates to the technical field of photovoltaic.The photovoltaic heat supply anti-freezing method comprises the steps that the first temperature and the second temperature of an inlet and an outlet of a heat collector are obtained, and the temperature of the heat collector is calculated according to the first temperature and the second temperature; the third temperature and the fourth temperature of the first junction point and the second junction point are obtained, and the outdoor pipeline temperature is obtained through calculation according to the third temperature and the fourth temperature; and a corresponding anti-freezing strategy is determined according to the temperature of the heat collector and the temperature of the outdoor pipeline, and the water pump, the pipeline switching module and the auxiliary anti-freezing module are controlled based on the anti-freezing strategy. The control module controls the water pump, the pipeline switching module and the auxiliary anti-freezing module on the basis of the temperature, accurate anti-freezing control is achieved, pipeline freezing is avoided, and the operation efficiency of the heat supply system is improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a photovoltaic heating and antifreeze system, method and device. Background Art

[0002] Due to the low outdoor temperature in winter in some parts of my country, the antifreeze problem of solar collectors must be considered when applying solar energy. The antifreeze control of the antifreeze system in the relevant technology is not accurate enough, and it may not be able to detect the freezing of the pipeline in time, which will lead to the freezing of the pipeline and reduce the operating efficiency of the heating system. Summary of the invention

[0003] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0004] To this end, the first objective of the present application is to propose a photovoltaic heating and antifreeze system.

[0005] The second purpose of this application is to propose a photovoltaic heating and antifreeze method.

[0006] The third objective of the present application is to provide a photovoltaic heating and antifreeze device.

[0007] The fourth objective of the present application is to provide an electronic device.

[0008] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a photovoltaic heating antifreeze system, including: a collector, a temperature sensor, a water pump, a pipeline switching module, an antifreeze pipeline, and an auxiliary antifreeze module;

[0009] The heat collector and the water pump are arranged on a heat collection loop, a portion of the pipeline in the heat collection loop passing through the heat exchanger is a heat exchange pipeline, and two ends of the heat exchange pipeline are a first node and a second node;

[0010] Both ends of the antifreeze pipeline are connected to the first node and the second node;

[0011] The pipeline switching module is arranged on the heat exchange pipeline and the antifreeze pipeline, and is used to switch the pipeline connected to the heat collection loop;

[0012] The temperature sensors are arranged at the inlet and outlet of the heat collector and at the first and second intersections of the outdoor and indoor sides of the heat collection loop;

[0013] The auxiliary antifreeze module is arranged on the heat collection loop for auxiliary heating.

[0014] The second purpose of this application is to propose a photovoltaic heating and antifreeze method. It includes:

[0015] Acquire a first temperature and a second temperature at an inlet and an outlet of the collector, and calculate the collector temperature according to the first temperature and the second temperature;

[0016] Acquire a third temperature and a fourth temperature of the first junction point and the second junction point, and calculate the outdoor pipeline temperature according to the third temperature and the fourth temperature;

[0017] A corresponding antifreeze strategy is determined according to the collector temperature and the outdoor pipeline temperature, and the water pump, the pipeline switching module and the auxiliary antifreeze module are controlled based on the antifreeze strategy.

[0018] Optionally, calculating the collector temperature according to the first temperature and the second temperature includes:

[0019] Calculate the average value of the first temperature and the second temperature as the collector temperature; or,

[0020] A weighted average of the first temperature and the second temperature is calculated as the collector temperature.

[0021] Optionally, the calculating the collector temperature according to the third temperature and the fourth temperature includes:

[0022] Calculating an average value of the third temperature and the fourth temperature as the outdoor pipe temperature; or,

[0023] A weighted average of the third temperature and the fourth temperature is calculated as the outdoor pipe temperature.

[0024] Optionally, determining a corresponding antifreeze strategy according to the collector temperature and the outdoor pipeline temperature, and controlling the water pump, the pipeline switching module and the auxiliary antifreeze module based on the antifreeze strategy includes:

[0025] If the outdoor pipe temperature is greater than or equal to a preset first temperature threshold, the pipeline switching module is controlled to switch to the heat exchange pipeline, the water pump stops running, and the auxiliary antifreeze module stops running;

[0026] If the outdoor pipeline temperature is lower than the preset first temperature threshold, the pipeline switching module is controlled to switch to the antifreeze pipeline, the water pump runs intermittently, and the auxiliary antifreeze module stops running; and the antifreeze strategy is determined according to the collector temperature after running for a preset time.

[0027] Optionally, determining the antifreeze strategy according to the collector temperature after running for a period of time includes:

[0028] If the collector temperature is greater than a preset second temperature threshold, the pipeline switching module is controlled to switch to the heat exchange pipeline, the water pump stops running, and the auxiliary antifreeze module stops running;

[0029] If the collector temperature is less than or equal to a preset second temperature threshold, an antifreeze strategy is determined according to the outdoor pipeline temperature.

[0030] Optionally, determining the antifreeze strategy according to the outdoor pipeline temperature includes:

[0031] If the outdoor pipe temperature is greater than a preset third temperature threshold, the pipeline switching module is controlled to switch to the antifreeze pipeline, the water pump continues to operate, and the auxiliary antifreeze module stops operating;

[0032] If the outdoor pipeline temperature is less than or equal to the preset third temperature threshold, the pipeline switching module is controlled to switch to the antifreeze pipeline, the water pump runs continuously, the auxiliary antifreeze module starts to run, and determines the antifreeze strategy according to the collector temperature after running for a preset period of time.

[0033] Optionally, the step of determining an antifreeze strategy according to the collector temperature after running for a preset period of time includes:

[0034] If the collector temperature is greater than a preset second temperature threshold, the pipeline switching module is controlled to switch to the heat exchange pipeline, the water pump stops running, and the auxiliary antifreeze module stops running;

[0035] If the collector temperature is less than or equal to a preset second temperature threshold, the pipeline switching module is controlled to switch to the antifreeze pipeline, the water pump runs continuously, and the auxiliary antifreeze module starts to run.

[0036] The third object of the present application is to provide a photovoltaic heating and antifreeze device. It includes:

[0037] A first calculation module, used for acquiring a first temperature and a second temperature at an inlet and an outlet of the collector, and calculating a collector temperature according to the first temperature and the second temperature;

[0038] A second calculation module is used to obtain a third temperature and a fourth temperature of the first junction point and the second junction point, and calculate the outdoor pipeline temperature according to the third temperature and the fourth temperature;

[0039] The antifreeze control module is used to determine the corresponding antifreeze strategy according to the collector temperature and the outdoor pipeline temperature, and control the water pump, the pipeline switching module and the auxiliary antifreeze module based on the antifreeze strategy.

[0040] To achieve the above-mentioned purpose, a fourth aspect of the present application provides an electronic device, comprising: a processor, and a memory communicatively connected to the processor;

[0041] The memory stores computer-executable instructions;

[0042] The processor executes the computer-executable instructions stored in the memory to implement the system as described in any one of the first aspects.

[0043] The photovoltaic heating and antifreeze system provided in the present application controls the water pump, pipeline switching module and auxiliary antifreeze module based on temperature through the control module, thereby achieving precise antifreeze control, avoiding pipeline freezing, and improving the operating efficiency of the heating system.

[0044] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0046] Figure 1 A schematic diagram of the structure of a photovoltaic heating and antifreeze system provided in an embodiment of the present application;

[0047] Figure 2 A schematic diagram of a photovoltaic heating and antifreeze method provided in an embodiment of the present application;

[0048] Figure 3 A schematic diagram of a photovoltaic heating and antifreeze method provided in an embodiment of the present application;

[0049] Figure 4 A schematic structural diagram of a photovoltaic heating and antifreeze device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0050] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0051] For the thermal link, the antifreeze problem of solar energy system is one of the main problems restricting the utilization of solar energy thermal energy in cold and severe cold regions. Therefore, the antifreeze problem of equipment and pipelines should be specially considered when operating in cold regions. The freezing process of water is as follows: when the temperature of water drops below 0℃, it becomes supercooled water. When ice nuclei larger than the critical size appear in the supercooled water, the freezing process begins. The ice nuclei grow in the supercooled water and eventually become ice in the macroscopic sense. Whether supercooled water with a certain degree of supercooling freezes is affected by many factors, including the flow state of water; the geometric and physical properties of the surface of the ice matrix; the surface area and the external force, etc. Studying the influence of these factors on the freezing of supercooled water will help to propose new ideas to prevent freezing, solve the antifreeze problem in solar water heating systems, and promote the application of solar water heating systems.

[0052] At present, commonly used antifreeze measures include: using antifreeze liquid; using air as the collector working fluid; using a circulating pump to circulate hot water between the hot water storage tank and the flat plate collector; emptying the working fluid in the collector; designing antifreeze collector plates and pipelines, etc.

[0053] Circulation antifreeze refers to a method of circulating water between the outdoor collector and pipeline and the water storage tank, using the high-temperature heat source in the water storage tank to heat the outdoor collector and pipeline to prevent them from freezing. Circulation antifreeze requires a circulation water pump (two sets of circulation pumps are required in an indirect system), and also consumes the high-temperature heat energy in the water tank. It can be said that circulation antifreeze is not energy-saving. Once a power outage occurs, the heat collection loop may freeze or freeze. In addition, when used in extremely cold areas, it may still freeze even if it is circulated. Especially for flat-plate collectors with large heat dissipation, the heat absorption plate core may be frozen.

[0054] Electric heating tape antifreeze means that electric heating tape is arranged at the location where frost cracking may occur. When the temperature is lower than the set value, the electric heating tape is turned on for heating to keep the water inside the pipe from freezing. This antifreeze method can be used in extremely cold areas, but some literature points out that the antifreeze effect and economy are not very good in extremely cold areas. Electric heating tape can only solve the antifreeze problem of pipelines, but cannot solve the antifreeze problem of collectors. Therefore, it can only be used in vacuum tube solar energy systems with antifreeze collectors. In addition, electric heating tape antifreeze consumes high-grade electricity, and the power is generally 10 to 25W / m, which has certain fire hazards and cannot be used during power outages.

[0055] Drainage antifreeze is an active antifreeze solution with a relatively reliable antifreeze effect, especially reflux drainage antifreeze. Therefore, it is mostly used for winter antifreeze of flat-plate collector systems. For all-glass vacuum tube collector systems, it is generally not advisable to use the drain antifreeze solution, because when the water is added again after draining, the all-glass vacuum tube may explode. In addition, drain antifreeze has certain requirements for the slope of the system pipeline and the collector. For large-scale solar heating systems, due to the long outdoor pipelines, the slope of the pipelines is affected by the site or layout, etc., and there is often water accumulation in the elbows and other pipe sections, which cannot be effectively drained.

[0056] Some scholars have modified the collector or system structure to solve the possible icing problem. Zheng Weili used low-temperature electric heating film to heat the core of the flat-plate solar collector, and conducted experimental research on the heating position, heating area, heating time, and heating power. The results showed that the use of low-temperature electric heating film can prevent the flat-plate solar collector from freezing and cracking in winter. Based on the comparative analysis of the anti-freezing principle, flow channel design, material properties and manufacturing process of the flat-plate collector structure, a diamond-shaped iron rope-shaped stainless steel structure anti-freezing flat-plate collector was developed, which can be used in the severely cold areas in the north.

[0057] Considering the application complexity and actual effect, adding antifreeze to the working fluid is a better antifreeze measure. Antifreeze antifreeze has the advantage of reliable antifreeze and is suitable for various types of collectors. Antifreeze antifreeze is usually used in split double-circuit solar energy systems or indirect circulation solar water heating or heating systems. It is a more common antifreeze method. Antifreeze is generally a mixture of ethylene glycol, water and a small amount of additives. The freezing point range is generally -40 to -60 ° C, and the specific heat capacity is about 3.56×10 3 J / (kg·℃), it can be seen that the minimum allowable operating temperature of the antifreeze liquid meets the temperature conditions of the area where the cold-region barracks are located. At the same time, it has a high specific heat capacity, so it is suitable as a heat collecting medium to solve the antifreeze problem of thermal equipment and pipelines in cold-region barracks.

[0058] At the same time, the selection of antifreeze concentration is usually determined based on the local minimum outdoor ambient temperature, which often leads to a higher antifreeze concentration, increasing system operating costs, or a lower antifreeze concentration that cannot effectively prevent freezing. Therefore, other antifreeze measures should also be adopted.

[0059] To address this problem, the present application provides a photovoltaic heating and antifreeze system. Figure 1 This is a schematic diagram of the structure of a photovoltaic heating and antifreeze system provided in an embodiment of the present application. Figure 1 As shown, the system includes:

[0060] Heat collector 10, temperature sensor 20, water pump 30, pipeline switching module 40, antifreeze pipeline 50, auxiliary antifreeze module 60;

[0061] The heat collector and the water pump are arranged on a heat collection loop, and a portion of the pipeline in the heat collection loop passing through the heat exchanger is a heat exchange pipeline 70, and two ends of the heat exchange pipeline are a first node 80 and a second node 90;

[0062] Both ends of the antifreeze pipeline are connected to the first node and the second node;

[0063] The pipeline switching module is arranged on the heat exchange pipeline and the antifreeze pipeline, and is used to switch the pipeline connected to the heat collection loop;

[0064] In a possible embodiment, the pipeline switching module is a solenoid valve, and a solenoid valve is respectively provided on the heat exchange pipeline and the antifreeze pipeline. When it is necessary to switch to the heat exchange pipeline, the solenoid valve on the antifreeze pipeline is closed, and the solenoid valve on the heat exchange pipeline is opened. When it is necessary to switch to the antifreeze pipeline, the solenoid valve on the heat exchange pipeline is closed, and the solenoid valve on the antifreeze pipeline is opened.

[0065] In a possible embodiment, the pipeline switching module is a 3-way interface arranged at the second node or the first node. When it is necessary to switch to the heat exchange pipeline, the interface connected to the antifreeze pipeline is closed, and the interface connected to the heat exchange pipeline is opened. When it is necessary to switch to the antifreeze pipeline, the interface connected to the heat exchange pipeline is closed, and the interface connected to the antifreeze pipeline is opened.

[0066] The temperature sensors are arranged at the inlet and outlet of the collector and the first and second intersections of the outdoor and indoor sides of the collector loop; the measured temperatures are respectively the first temperature T1, the second temperature T2, the third temperature T3, and the fourth temperature T4.

[0067] The auxiliary antifreeze module is arranged on the heat collection loop for auxiliary heating.

[0068] Figure 2 The schematic diagram of a photovoltaic heating antifreeze method provided in the embodiment of the present application is as follows Figure 2 As shown, the method includes:

[0069] Step 201, obtaining a first temperature and a second temperature at an inlet and an outlet of the collector, and calculating the collector temperature according to the first temperature and the second temperature;

[0070] Step 202, obtaining a third temperature and a fourth temperature of the first junction point and the second junction point, and calculating an outdoor pipeline temperature according to the third temperature and the fourth temperature;

[0071] Step 203, determining a corresponding antifreeze strategy according to the collector temperature and the outdoor pipeline temperature, and controlling the water pump, the pipeline switching module and the auxiliary antifreeze module based on the antifreeze strategy.

[0072] Optionally, calculating the collector temperature according to the first temperature and the second temperature includes:

[0073] Calculate the average value of the first temperature and the second temperature as the collector temperature; or,

[0074] A weighted average of the first temperature and the second temperature is calculated as the collector temperature.

[0075] The first temperature and the second temperature both reflect the temperature of the collector. In order to facilitate subsequent antifreeze control, the first temperature and the second temperature are processed to obtain a collector temperature.

[0076] Optionally, the minimum value between the first temperature and the second temperature may be used as the collector temperature.

[0077] Optionally, the calculating the collector temperature according to the third temperature and the fourth temperature includes:

[0078] Calculating an average value of the third temperature and the fourth temperature as the outdoor pipe temperature; or,

[0079] A weighted average of the third temperature and the fourth temperature is calculated as the outdoor pipe temperature.

[0080] The third temperature and the fourth temperature both reflect the temperature of the outdoor pipe. In order to facilitate subsequent antifreeze control, the third temperature and the fourth temperature are processed to obtain an outdoor pipe temperature.

[0081] Optionally, the minimum value between the third temperature and the fourth temperature may be used as the outdoor pipe temperature.

[0082] According to the principle of solar energy self-circulation antifreeze, the solar energy self-circulation control strategy is divided into three cases:

[0083] Case 1: When the temperature of the liquid in the collector is high, first of all, we must make full use of the residual heat of the liquid in the vacuum tube for antifreeze. Since the vacuum tube collector has good thermal insulation performance and a large water capacity, the temperature is significantly higher than that of the outdoor pipe. Therefore, during nighttime operation, as time goes by and the outdoor ambient temperature changes, the temperature drop trend of the outdoor pipe part will be significantly higher than that of the collector. Therefore, compared with the collector, the temperature of the outdoor pipe part (T3, T4) will first reach the freezing temperature or be lower than a certain temperature value. Therefore, at this time, the high-temperature liquid in the collector can be sent to the outdoor pipeline by circulation to ensure that the temperature of the outdoor pipeline part is at a high level, and the entire collector loop will not freeze. At the same time, after a certain period of operation, when the liquid temperature in the entire collector loop is relatively uniform, the antifreeze operation should be stopped to reduce the operation time and save energy consumption. This situation is called intermittent operation.

[0084] Case 2: When the temperature of the liquid in the collector is low but not frozen, while fully utilizing the residual heat of the liquid in the vacuum tube, ensure that there is no possibility of freezing of the liquid in the collector and outdoor pipeline. In this case, since the temperature of the liquid in the collector is low, the liquid temperature rise that can be achieved by circulating the outdoor pipeline is also low, and the time interval between two circulation operations is also short. In this case, the intermittent operation is changed to continuous operation.

[0085] Case 3: The collector is always in a heat dissipation state at night. As time goes by and the temperature of the liquid in the collector decreases, the entire collector loop may freeze. When there is no excess heat in the collector for antifreeze, other measures are needed to prevent the entire loop from freezing. This situation is called auxiliary operation condition.

[0086] In short, the entire antifreeze operation process includes three operating conditions: intermittent operation, continuous operation, and auxiliary operation. Intermittent operation is the main one. When intermittent operation cannot meet the requirements, continuous operation and auxiliary operation are adopted. The setting of continuous operation is set when the liquid temperature in the collector is low in order to avoid frequent start and stop of intermittent cycle. The purpose is to facilitate the stable operation of the antifreeze system and equipment safety. The setting of auxiliary operation is mainly to meet the antifreeze needs in extreme weather conditions, such as multiple consecutive rainy days. When the entire collector loop is likely to freeze, it is necessary to heat the collector loop through auxiliary heat sources or other antifreeze measures to achieve antifreeze requirements. Usually, auxiliary measures can be used to circulate and heat the high-temperature liquid in the water tank.

[0087] Therefore, at certain nights, if the temperature of the liquid in the collector is high and the heat dissipation at night is small, only one or more intermittent operations are needed to meet the antifreeze requirements for the entire night; at certain nights, if the temperature of the liquid in the collector is low or the heat dissipation at night is large, as the temperature of the liquid in the collector decreases, when intermittent operation is not enough to meet the antifreeze requirements, it is necessary to change to continuous operation on the basis of intermittent operation. At this time, the night antifreeze operation mode includes two working conditions: intermittent operation and continuous operation. In extreme weather conditions (such as continuous rainy or snowy weather), due to the lack of solar radiation or low solar radiation, the liquid temperature rise during the day is not enough to meet the antifreeze requirements, and the entire collector loop is in danger of freezing. In this case, it is necessary to add additional heat to the collector loop for antifreeze. At this time, it is necessary to add auxiliary operation on the basis of intermittent operation and continuous operation.

[0088] Figure 3 A schematic diagram of a photovoltaic heating and antifreeze method provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, the corresponding antifreeze strategy is determined according to the collector temperature and the outdoor pipeline temperature, and the water pump, the pipeline switching module and the auxiliary antifreeze module are controlled based on the antifreeze strategy, including:

[0089] Step 301, read in the outdoor pipe temperature T6 and the collector temperature T5;

[0090] Step 302: If the outdoor pipe temperature T6 is greater than or equal to the preset first temperature threshold TA, the pipeline switching module is controlled to switch to the heat exchange pipeline, the water pump stops running, and the auxiliary antifreeze module stops running;

[0091] Step 303, if the outdoor pipeline temperature T6 is less than the preset first temperature threshold TA, the pipeline switching module is controlled to switch to the antifreeze pipeline, the water pump runs intermittently, and the auxiliary antifreeze module stops running; and the antifreeze strategy is determined according to the collector temperature after running for a preset time.

[0092] Step 304: if the collector temperature T5 is greater than the preset second temperature threshold TB, the pipeline switching module is controlled to switch to the heat exchange pipeline, the water pump stops running, and the auxiliary antifreeze module stops running;

[0093] Step 305: If the collector temperature T5 is less than or equal to a preset second temperature threshold TB, an antifreeze strategy is determined according to the outdoor pipeline temperature.

[0094] If the outdoor pipe temperature T6 is greater than the preset third temperature threshold TC, the pipeline switching module is controlled to switch to the antifreeze pipeline, the water pump continues to operate, and the auxiliary antifreeze module stops operating;

[0095] Step 306, if the outdoor pipeline temperature T6 is less than or equal to the preset third temperature threshold TC, the pipeline switching module is controlled to switch to the antifreeze pipeline, the water pump runs continuously, the auxiliary antifreeze module starts to run, and determines the antifreeze strategy according to the collector temperature after running for a preset period of time.

[0096] Step 307: if the collector temperature T5 is greater than the preset second temperature threshold TB, the pipeline switching module is controlled to switch to the heat exchange pipeline, the water pump stops running, and the auxiliary antifreeze module stops running;

[0097] Step 308: If the collector temperature T5 is less than or equal to the preset second temperature threshold TB, the pipeline switching module is controlled to switch to the antifreeze pipeline, the water pump runs continuously, and the auxiliary antifreeze module starts to run.

[0098] In this embodiment, according to the above three operating conditions of intermittent operation, continuous operation and auxiliary operation, in order to more accurately implement the solar self-circulation antifreeze control strategy, the following control parameters are set:

[0099] Temperature measuring points T1, T2, T3, and T4 are used to test the liquid temperature at different positions of the collector loop, where T1 and T2 are the collector inlet and outlet temperatures, respectively, and T3 and T4 are the temperatures of the outdoor pipelines most susceptible to freezing. Under normal circumstances, the temperature values ​​of T1 and T2 are greater than T3 and T4, so under normal circumstances, T5 is greater than T6.

[0100] The initial temperature of antifreeze operation (the first temperature threshold) TA, when the temperature of a certain measuring point reaches this temperature value, the intermittent antifreeze operation is turned on. Since the collector inlet and outlet temperatures T1 and T2 are normally greater than T3 and T4, the initial temperature of antifreeze operation TA is determined by T6 corresponding to T3 and T4. Usually TA can be taken as the freezing point temperature of the pipeline liquid or 3 to 5°C higher than the freezing point temperature.

[0101] The antifreeze operation time tA refers to the time from the start of the antifreeze operation to the time when the liquid temperature at the outdoor pipeline measuring point is basically close to the collector inlet and outlet liquid temperature and can relatively maintain stability and balance. The antifreeze operation time tA is usually determined based on the length of the outdoor pipeline and the liquid flow rate in the pipe. The time should not be too long or too short. On the one hand, if the antifreeze operation time is too long, more water pump energy will be consumed, and the heat dissipation between the liquid in the pipe and the external environment will also be greater, affecting the economy of the antifreeze system: on the other hand, if the antifreeze operation time is too short, the high-temperature liquid in the collector cannot effectively exchange heat with the low-temperature liquid in the outdoor pipeline, which will shorten the antifreeze operation time interval and even cause frequent start and stop of the antifreeze system.

[0102] The antifreeze operation stop temperature (second temperature threshold) TB refers to the time after the intermittent antifreeze operation for a certain period of time. When the liquid temperature in the entire collector loop reaches a uniform and stable state, it is necessary to determine whether the antifreeze operation should be stopped or continued, and the basis for the determination is TB. If the collector temperature T5 is higher than TB, it corresponds to situation 1, and the intermittent operation antifreeze strategy should be adopted; otherwise, it corresponds to situation 2, and the continuous operation strategy should be adopted. Usually, TB should be slightly higher than TA to meet the situation requirements, such as TB = TA + 3 ~ 5 ° C.

[0103] TC is the auxiliary operation temperature (the third temperature threshold), which is mainly designed for situation 3. Auxiliary operation is based on continuous operation. When the liquid temperature in the entire collector loop drops from TB to TC, it indicates that the liquid in the collector loop will soon freeze, so an auxiliary heat source is needed to prevent freezing. TC is usually determined based on the outdoor pipe temperature T6, and the freezing point temperature of the liquid in the pipe can be taken. However, studies have shown that for the liquid in the pipe in a flowing state, especially in a turbulent state, freezing will only occur in a supercooled state, and the supercooling degree is generally 0.5 to 4°C, so the setting of TC can be slightly lower than its freezing point temperature. Therefore, the relationship between the above-mentioned set temperature values ​​is: TC <TA<TB。

[0104] Figure 4 A schematic diagram of the structure of a photovoltaic heating and antifreeze device provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, the device comprises:

[0105] A first calculation module 410 is used to obtain a first temperature and a second temperature at an inlet and an outlet of the collector, and calculate the collector temperature according to the first temperature and the second temperature;

[0106] A second calculation module 420 is used to obtain a third temperature and a fourth temperature of the first junction point and the second junction point, and calculate the outdoor pipeline temperature according to the third temperature and the fourth temperature;

[0107] The antifreeze control module 430 is used to determine the corresponding antifreeze strategy according to the collector temperature and the outdoor pipeline temperature, and control the water pump, the pipeline switching module and the auxiliary antifreeze module based on the antifreeze strategy.

[0108] In order to implement the above embodiments, the present application also proposes an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the system or method provided by the above embodiments.

[0109] In order to implement the above embodiments, the present application also proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the system or method provided by the above embodiments.

[0110] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which implements the system or method provided by the above embodiments when executed by a processor.

[0111] The collection, storage, use, processing, transmission, provision and disclosure of user personal information involved in this application are in compliance with relevant laws and regulations and do not violate public order and good morals.

[0112] It should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0113] The present application is expected to provide an implementation scheme for users to selectively block the use or access of personal information data. That is, the present disclosure is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, the risk can be minimized by limiting data collection and deleting the data. In addition, when applicable, such personal information is de-identified to protect the privacy of the user.

[0114] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0115] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0116] Any process or system description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0117] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0118] It should be understood that the various parts of the present application can be implemented with hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or systems can be implemented with software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented with hardware, as in another embodiment, it can be implemented with any one of the following technologies known in the art or their combination: a discrete logic circuit with a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit with a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0119] A person skilled in the art may understand that all or part of the steps of the system implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the system embodiment.

[0120] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0121] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A photovoltaic heating and antifreeze system, characterized in that: include: Collector, temperature sensor, water pump, pipeline switching module, antifreeze pipeline, auxiliary antifreeze module; The heat collector and the water pump are arranged on a heat collection loop, a portion of the pipeline in the heat collection loop passing through the heat exchanger is a heat exchange pipeline, and two ends of the heat exchange pipeline are a first node and a second node; Both ends of the antifreeze pipeline are connected to the first node and the second node; The pipeline switching module is arranged on the heat exchange pipeline and the antifreeze pipeline, and is used to switch the pipeline connected to the heat collection loop; The temperature sensors are arranged at the inlet and outlet of the heat collector and at the first and second intersections of the outdoor and indoor sides of the heat collection loop; The auxiliary antifreeze module is arranged on the heat collection loop for auxiliary heating.

2. A photovoltaic heating antifreeze method, characterized in that: Applicable to the photovoltaic heating and antifreeze system as claimed in claim 1, comprising: Acquire a first temperature and a second temperature at an inlet and an outlet of the collector, and calculate the collector temperature according to the first temperature and the second temperature; Acquire a third temperature and a fourth temperature of the first junction point and the second junction point, and calculate the outdoor pipeline temperature according to the third temperature and the fourth temperature; A corresponding antifreeze strategy is determined according to the collector temperature and the outdoor pipeline temperature, and the water pump, the pipeline switching module and the auxiliary antifreeze module are controlled based on the antifreeze strategy.

3. The method according to claim 2, characterized in that The step of calculating the collector temperature according to the first temperature and the second temperature includes: Calculate the average value of the first temperature and the second temperature as the collector temperature; or, A weighted average of the first temperature and the second temperature is calculated as the collector temperature.

4. The method according to claim 3, characterized in that The step of calculating the collector temperature according to the third temperature and the fourth temperature includes: Calculating an average value of the third temperature and the fourth temperature as the outdoor pipe temperature; or, A weighted average of the third temperature and the fourth temperature is calculated as the outdoor pipe temperature.

5. The method according to claim 4, characterized in that The method of determining a corresponding antifreeze strategy according to the collector temperature and the outdoor pipeline temperature, and controlling the water pump, the pipeline switching module and the auxiliary antifreeze module based on the antifreeze strategy, includes: If the outdoor pipe temperature is greater than or equal to a preset first temperature threshold, the pipeline switching module is controlled to switch to the heat exchange pipeline, the water pump stops running, and the auxiliary antifreeze module stops running; If the outdoor pipeline temperature is lower than the preset first temperature threshold, the pipeline switching module is controlled to switch to the antifreeze pipeline, the water pump runs intermittently, and the auxiliary antifreeze module stops running; and the antifreeze strategy is determined according to the collector temperature after running for a preset time.

6. The method according to claim 5, characterized in that Determining the antifreeze strategy according to the collector temperature after running for a period of time includes: If the collector temperature is greater than a preset second temperature threshold, the pipeline switching module is controlled to switch to the heat exchange pipeline, the water pump stops running, and the auxiliary antifreeze module stops running; If the collector temperature is less than or equal to a preset second temperature threshold, an antifreeze strategy is determined according to the outdoor pipeline temperature.

7. The method according to claim 6, characterized in that The step of determining the antifreeze strategy according to the outdoor pipeline temperature includes: If the outdoor pipe temperature is greater than a preset third temperature threshold, the pipeline switching module is controlled to switch to the antifreeze pipeline, the water pump continues to operate, and the auxiliary antifreeze module stops operating; If the outdoor pipeline temperature is less than or equal to the preset third temperature threshold, the pipeline switching module is controlled to switch to the antifreeze pipeline, the water pump runs continuously, the auxiliary antifreeze module starts to run, and determines the antifreeze strategy according to the collector temperature after running for a preset period of time.

8. The method according to claim 6, characterized in that The step of determining the antifreeze strategy according to the collector temperature after running for a preset time period includes: If the collector temperature is greater than a preset second temperature threshold, the pipeline switching module is controlled to switch to the heat exchange pipeline, the water pump stops running, and the auxiliary antifreeze module stops running; If the collector temperature is less than or equal to a preset second temperature threshold, the pipeline switching module is controlled to switch to the antifreeze pipeline, the water pump runs continuously, and the auxiliary antifreeze module starts to run.

9. A photovoltaic heating and antifreeze device, characterized in that: include: A first calculation module, used for obtaining a first temperature and a second temperature at an inlet and an outlet of the collector, and calculating a collector temperature according to the first temperature and the second temperature; A second calculation module is used to obtain a third temperature and a fourth temperature of the first junction point and the second junction point, and calculate the outdoor pipeline temperature according to the third temperature and the fourth temperature; The antifreeze control module is used to determine the corresponding antifreeze strategy according to the collector temperature and the outdoor pipeline temperature, and control the water pump, the pipeline switching module and the auxiliary antifreeze module based on the antifreeze strategy.

10. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the system according to any one of claims 2 to 8.

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