Electric heating film heating control system for overwintering production of sunlight greenhouse

Abstract

The invention discloses a solar greenhouse overwintering production electrothermal film heating control system, and relates to the technical field of greenhouse environment control, and the system comprises a crop distribution monitoring module which is used for collecting the position distribution condition of crops in a greenhouse and determining the temperature required by the growth of different crops; the region division module is used for dividing the interior of the greenhouse into different regions in a matrix region mode according to the shape and the area of the greenhouse; the data acquisition module is used for acquiring and preprocessing first environment information after the region division module divides the interior of the greenhouse into different regions, and the first environment information at least comprises room temperature data; after power regulation and control are completed, the room temperature of each region is continuously monitored through the data monitoring module, so that whether the self-adaptive auxiliary module is controlled to start working or not is determined, the region with the higher temperature is cooled, the region with the lower temperature is heated, and crops are made to be at the proper growth temperature.

Description

Technical Field

[0001] The invention relates to the technical field of greenhouse environment control, and more specifically to an electric heating film heating control system for wintering production in a solar greenhouse. Background Art

[0002] Solar greenhouse wintering production refers to the use of solar greenhouses to cultivate crops such as vegetables in winter, so as to produce fresh vegetables even in cold seasons. Solar greenhouses make full use of solar energy to maintain indoor temperature without or with little heating, so that crops can safely survive the winter and continue to produce; In greenhouse cultivation, the difference in soil position and sunlight reception angle leads to the non-uniform distribution of temperature inside the greenhouse. This non-uniform temperature distribution has an adverse effect on crop growth. For example, in areas with lower temperatures, crops grow slowly and are susceptible to pests and diseases; while in areas with higher temperatures, crops may be damaged by excessive evaporation of water and physiological metabolic disorders. Traditional greenhouse temperature control methods often only focus on the temperature regulation of the entire greenhouse, but fail to effectively solve the problem of temperature non-uniformity caused by location differences.

[0003] Therefore, there is an urgent need for a system that can accurately control the temperature distribution in the greenhouse to improve this unevenness and provide a more uniform growth environment for crops. Summary of the invention

[0004] In order to solve the above problems, the present invention provides an electric heating film heating control system for wintering production in a solar greenhouse.

[0005] The present invention provides a solar greenhouse wintering production electric heating film heating control system, comprising: The crop distribution monitoring module is used to collect the location distribution of crops in the greenhouse and determine the temperature required for the growth of different crops; The area division module divides the greenhouse into different areas in a matrix manner according to the shape and area of ​​the greenhouse; A data acquisition module, which acquires and pre-processes first environmental information after the area division module divides the interior of the greenhouse into different areas, wherein the first environmental information at least includes room temperature data; A data analysis and decision module receives the first environmental information transmitted by the data acquisition module, processes the temperature data based on the temperature uniformity model, determines the area to be regulated and the regulation range, and obtains the heating power adjustment required for the electric heating film in each area; A control execution module receives the instructions sent by the data analysis and decision module and accurately controls the electric heating film power in each area; An adaptive auxiliary module, after the control execution module completes the execution of the control instruction, assists in raising the temperature for the temperature deviation area, and assists in lowering the temperature for the temperature high area; Human-computer interaction module, used to display relevant data to users.

[0006] Preferably, the temperature data is processed based on the temperature uniformity model, and the specific steps are: The temperature of each area collection point is collected; Calculate the average temperature of all regional collection points as the reference temperature ; For each collection point i, calculate the difference between the current collection point temperature and the reference temperature ; Pre-set temperature difference threshold ; like , a first result is generated and a first operation is performed.

[0007] Preferably, generating the first result and performing the first operation specifically includes: Determine that the area where the collection point is located is a control area; Combined with the current temperature deviation ( ) size to calculate the required heating power adjustment amount for the electric heating film in this area.

[0008] Preferably, the adaptive adjustment module includes a ventilation module, and the specific working process is as follows: Determine a temperature coefficient (when 0:00); Calculate the ventilation correction factor ; in accordance with Determine the initial ventilation volume of the ventilation module ; Calculate actual ventilation volume ; By formula Get ventilation time.

[0009] Preferably, the determined temperature coefficient The specific steps are: Determine the current sunlight intensity ; Through empirical formula Conclude.

[0010] Preferably, the adaptive adjustment module also includes a sunshade module, and the specific working process is as follows: Calculate the shade area ; Calculate the duration of shading ; Adjust the shading area ratio in real time.

[0011] Preferably, the adaptive adjustment module also includes a heating compensation module, and the specific working process is as follows: set up is the temperature deviation (when 0:00); According to the formula ; in, is a preset time period parameter used to control the period of the sine function. To set the temperature, is the current temperature, is the basic heating power, t is the heating duration; Setting power cap ,when hour, , and trigger an alarm.

[0012] Preferably, the ventilation correction factor is calculated Specifically: Determine the temperature and internal air humidity H; Determine the current outdoor wind speed ; According to the formula Derive the ventilation correction factor.

[0013] Preferably, the precise control of the electric heating film power in each area includes: Re-order crops based on the temperature required in each area; The temperature required by the crops is in the middle value as the midpoint position; The temperatures required for crops are arranged in increasing order from the starting point to the midpoint.

[0014] The required temperatures of crops are arranged in descending order from the midpoint to the focal point; Based on the above, the positions of crops are sorted again.

[0015] Preferably, the human-computer interaction module is used to display relevant data to the user, specifically including: The module allows users to set the target temperature and the allowable temperature deviation range, and displays the real-time temperature data of each area and the working status of the electric heating film to the user.

[0016] Beneficial effect: After the power regulation is completed, the data monitoring module continues to monitor the room temperature of each area, so as to decide whether to control the adaptive auxiliary module to start working, so as to cool down the area with high temperature and heat up the area with low temperature, so that the crops are at a suitable growth temperature. Through such cyclic monitoring and regulation, the greenhouse can maintain a relatively uniform temperature distribution in different seasons and at different times, creating a good thermal environment for crop growth. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flow chart of the management system of the present invention. DETAILED DESCRIPTION

[0018] Application scenarios: In greenhouse cultivation, the difference in soil position and sunlight reception angle leads to the non-uniform distribution of temperature inside the greenhouse. This non-uniform temperature distribution has an adverse effect on crop growth. For example, in areas with lower temperatures, crops grow slowly and are susceptible to pests and diseases; while in areas with higher temperatures, crops may be damaged by excessive evaporation of water and physiological metabolic disorders. Traditional greenhouse temperature control methods often only focus on the temperature regulation of the entire greenhouse, but fail to effectively solve the problem of temperature non-uniformity caused by location differences.

[0019] like Figure 1 Shown: Solar greenhouse wintering production electric heating film heating control system, including: The crop distribution monitoring module is used to collect the location distribution of crops in the greenhouse and determine the temperature required for the growth of different crops; It should be noted that by placing crops in pre-defined areas and understanding the temperature required for the growth of each crop, for example, if there are four varieties of crops, the same variety can be placed in the same area, and the growth temperature required for different varieties can be obtained in advance.

[0020] The area division module divides the greenhouse into different areas in a matrix manner according to the shape and area of ​​the greenhouse; For example, the area division module divides the areas reasonably in a matrix manner according to the shape and area of ​​the greenhouse, and lays electric heating film. Temperature sensors are installed in each area to monitor the temperature in real time. The electric heating film uses high thermal conductivity and aging-resistant materials to ensure uniform heating and long life.

[0021] It should be noted that by dividing the interior of the greenhouse into a "chessboard" shape and placing different types of crops in corresponding areas, when it is necessary to add areas or functional areas, they can be added on the original basis more conveniently without causing too much interference to the overall layout.

[0022] A data acquisition module, which acquires and pre-processes first environmental information after the area division module divides the interior of the greenhouse into different areas, wherein the first environmental information at least includes room temperature data; It should be noted that the data acquisition module is connected to the temperature sensors in each area to collect room temperature data in real time and transmit the data to the data analysis and decision module for analysis and processing. The module has data preprocessing functions such as filtering and amplification to improve the accuracy of the data.

[0023] A data analysis and decision module receives the first environmental information transmitted by the data acquisition module, processes the temperature data based on the temperature uniformity model, determines the area to be regulated and the regulation range, and obtains the heating power adjustment amount required for the electric heating film in each area; It should be noted that after obtaining the collected temperature data, the heating power adjustment amount of the electric heating film in each area is calculated by pre-setting the temperature standard value and the real-time temperature of the area to achieve uniform control.

[0024] A control execution module receives the instructions sent by the data analysis and decision module and accurately controls the electric heating film power in each area; It should be noted that the power electronic technology such as thyristor voltage regulation is used to accurately adjust the power of the electric heating film to achieve continuous and smooth adjustment from 0 to rated power.

[0025] An adaptive auxiliary module, after the control execution module completes the execution of the control instruction, assists in raising the temperature for the temperature deviation area, and assists in lowering the temperature for the temperature high area; It should be noted that after the power regulation is completed, the data monitoring module continues to monitor the room temperature in each area, so as to decide whether to control the adaptive auxiliary module to start working, so as to cool down the area with high temperature and heat up the area with low temperature, so that the crops are at a suitable growth temperature.

[0026] Human-computer interaction module, used to display relevant data to users.

[0027] It should be understood that, first of all, in the greenhouse planning and construction stage, the installation location of the temperature sensor should be reasonably determined according to the shape, size and cultivation layout of the greenhouse to ensure that the temperature conditions in different areas of the greenhouse can be fully and accurately reflected; after the system is started, the data acquisition module continues to work, and the data analysis and decision-making module continuously analyzes the data and directs the control execution module to act; For example, when the sun shines in the morning in winter, the temperature of the cultivation bed on the east side may rise quickly, and it is difficult to reduce the temperature to a suitable level by adjusting the power of the electric heating film. The data analysis and decision module activates the adaptive auxiliary module to appropriately assist ventilation and cooling. On the west side, the temperature is low due to insufficient sunlight, and it is difficult to raise the temperature to a suitable temperature by adjusting the power of the electric heating film. At this time, the adaptive auxiliary module on the west side is started to slowly heat up. Through such cyclic monitoring and regulation, the greenhouse can maintain a relatively uniform temperature distribution in different seasons and at different times, creating a good thermal environment for crop growth.

[0028] As a further embodiment, the temperature data is processed based on the temperature uniformity model, and the specific steps are: The temperature of each area collection point is collected; Calculate the average temperature of all regional collection points as the reference temperature ; For each collection point i, calculate the difference between the current collection point temperature and the reference temperature ; Pre-set temperature difference threshold ; like , a first result is generated and a first operation is performed.

[0029] It should be understood that if we have a large greenhouse for crops, it is divided into four areas, A, B, C, and D, and each area is equipped with electric heating film for heating; The first is to preset the temperature standard value, for example, the temperature suitable for crop growth in the entire greenhouse is set at 20 degrees Celsius; temperature sensors are installed in each area to collect real-time temperature data; Suppose, in the initial state, the real-time temperature of area A is 18 degrees Celsius, area B is 20 degrees Celsius, area C is 19 degrees Celsius, and area D is 21 degrees Celsius; The intelligent algorithm will compare and analyze these real-time temperature data with the preset standard value of 20 degrees Celsius; For area A, the temperature is 2 degrees Celsius lower than the standard value; the intelligent algorithm will determine the amount of heating power adjustment that needs to be increased based on its own calculation rules; For example, the intelligent algorithm calculates that for every 1 degree Celsius drop in temperature, 100 watts of power needs to be added to quickly heat up, so area A needs to increase power by 200 watts; The temperature in area B is just the standard value, so the algorithm calculates that the heating power of the electric heating film in this area does not need to be adjusted and can be kept in the current state; The temperature in area C is 1 degree Celsius lower than the standard value. According to the algorithm rules, it may be necessary to increase the power by 100 watts; If the temperature in area D is 1 degree Celsius higher than the standard value, the algorithm may calculate that a certain amount of power needs to be reduced to cool it down, such as reducing the power by 80 watts to gradually reduce the temperature to the standard value.

[0030] By calculating the heating power adjustment required for the electric heating film for each area and implementing corresponding adjustments, the goal of controlling the uniformity of the temperature distribution in the entire greenhouse can be achieved, so that the temperature in each area is close to 20 degrees Celsius, providing a suitable growth environment for crops.

[0031] As a further embodiment, generating the first result and performing the first operation specifically includes: Determine that the area where the collection point is located is a control area; Combined with the current temperature deviation ( ) size to calculate the required heating power adjustment amount for the electric heating film in this area.

[0032] It should be noted that, for example, the intelligent algorithm stipulates that for every 1°C temperature deviation, the electric heating film power needs to be adjusted by a certain wattage, so that the specific power adjustment amount can be calculated based on this proportional relationship and set in advance for calculation.

[0033] As a further embodiment, the adaptive adjustment module includes a ventilation module, and the specific working process is as follows: Determine a temperature coefficient (when 0:00); Calculate the ventilation correction factor ; in accordance with Determine the initial ventilation volume of the ventilation module ; It should be noted that, for example, The value of initial ventilation is determined by : like At 3-5 degrees, set ; like At 5-8 degrees, set ; like At 8 degrees, .

[0034] Calculate actual ventilation volume ; It should be noted that according to the formula Calculated.

[0035] By formula Get the ventilation time; it should be noted that 0.05 is the empirical heat dissipation efficiency coefficient.

[0036] It should be understood that after the power of the electric heating film is adjusted, the temperature situation continues to be monitored. If the temperature has not dropped to the expected level, the adaptive auxiliary module needs to intervene to assist in cooling the temperature.

[0037] As a further embodiment, the temperature coefficient is determined The specific steps are: Determine the current sunlight intensity ; The unit is lux, and the value range is 0-10000. Through empirical formula Among them, 0.01 is A parameter that determines Temperature coefficient The degree of influence, 0.2 is a fixed addend, When it is equal to 0, The value is 0.2.

[0038] As a further embodiment, the adaptive adjustment module further includes a sunshade module, and the specific working process is as follows: Calculate the shade area ; It should be noted that, using the formula Calculated.

[0039] Calculate the duration of shading ; It should be noted that, using the formula It is concluded that 0.02 is the shading and cooling efficiency coefficient.

[0040] Adjust the shading area ratio in real time. It should be noted that during the shading process, the shading area ratio is adjusted in real time according to the temperature change. If the temperature drop rate exceeds a certain value (such as 0.5 degrees per minute), the shading area is appropriately reduced, otherwise it is increased.

[0041] Specifically, when Apply shading module for shading.

[0042] As a further embodiment, the adaptive adjustment module further includes a heating compensation module, and the specific working process is as follows: set up is the temperature deviation (when 0:00); According to the formula ; in, is a preset time period parameter used to control the period of the sine function. To set the temperature, is the current temperature, is the basic heating power, t is the heating duration; Setting power cap ,when hour, , and trigger an alarm.

[0043] It should be understood that after the power of the electric heating film is adjusted, the temperature situation continues to be monitored. If the temperature has not risen to the expected level, the adaptive auxiliary module needs to intervene to assist in heating.

[0044] It should be understood that during the heating process, the current temperature is updated and the heating power is recalculated at regular intervals until the stop condition is met: n consecutive times (n is the preset number of times) When the temperature is less than or equal to the preset stop threshold, heating is stopped and the temperature monitoring state is entered. If the temperature exceeds the range again, the algorithm is restarted.

[0045] It needs further explanation that This part reflects the dynamic response to temperature deviation. It adjusts the heating power according to the size of the temperature deviation. The larger the absolute value of is, the more obvious the effect of this part on the heating power is; for example, when the temperature deviation is large, the value of this part will be closer to 2, so that the heating power will increase significantly on the basis of the basic power to quickly make up for the temperature difference; Should Partly taking into account the set temperature and current temperature The difference affects the heating power in a form similar to the logistic function. When the set temperature and the current temperature differ greatly, this part will increase the heating power. It simulates the heating demand of factors such as environmental heat dissipation. This design can adjust the heating power more accurately according to the actual temperature difference, rather than simply judging whether the temperature is below a certain threshold. at last, A time period factor is introduced. During the heating process, the heating power will fluctuate periodically over time. This fluctuation can simulate some natural fluctuations of the equipment during long-term heating, or to better adapt to factors such as the thermal inertia of the heated object. For example, for some materials with thermal hysteresis characteristics, this periodic adjustment may help to heat more evenly.

[0046] Specifically, the whole formula realizes comprehensive adaptive adjustment of heating power by multiplying these three factors. As the heating process proceeds, the temperature deviation will gradually decrease, the relationship between the ambient temperature and the heated object will also change, and the time period factor will continue to play a role. This comprehensive adaptive mechanism can make the heating power change dynamically according to the actual heating situation, which is conducive to avoiding the over-heating or under-heating that may occur in traditional heating methods. Moreover, reasonable restrictions are imposed on the adjustment part of each factor; for example, the numerator and denominator of the temperature deviation factor are designed so that the value of this part will not be too large, which helps to avoid the situation where the heating power increases without limit due to excessive temperature deviation; similarly, the function form of the ambient temperature factor also has an asymptote, which will not cause the heating power to increase infinitely due to excessive temperature difference; this design helps to maintain the stability and safety of the heating system in various complex heating environments.

[0047] As a further embodiment, the ventilation correction factor is calculated Specifically: Determine the temperature and internal air humidity H; where the value range is 0% to 100%; Determine the current outdoor wind speed ; The unit is meters per second, and the value range is 0 to 20.

[0048] According to the formula Derive the ventilation correction factor.

[0049] As a further embodiment, the precise control of the electric heating film power in each area includes: Re-order crops based on the temperature required in each area; The temperature required by the crops is in the middle value as the midpoint position; The temperatures required for crops are arranged in increasing order from the starting point to the midpoint.

[0050] The required temperatures of crops are arranged in decreasing order from midpoint to key point; Based on the above, the positions of crops are sorted again.

[0051] It should be understood that by re-arranging the areas of crops in the greenhouse, it is helpful to avoid the problem that the difference between the requirements of different crops is too large and affects their growth. For example, the three existing areas A, B, C, D, and E correspond to the required temperatures of 18, 16, 25, 21, and 22 degrees respectively. If it is divided according to the previous division, there may be an arrangement order of ABCDE. At this time, the adjacent crops are not sorted according to the smallest temperature difference, so the temperature of adjacent crops is greatly affected. For example, there is a difference of 9 degrees between B and C. In this way, whether the temperature is lowered or increased in the future, it may affect the growth of adjacent crops. Therefore, based on this situation, we need to re-sort. According to the new sorting method, we will take 21 degrees as the middle value, and the final sorting order is BADEC. The temperature difference required for the crops after re-sorting is the smallest. At this time, after cooling or warming operations, the growth temperature required for adjacent crops is the smallest. Therefore, it is helpful to avoid excessive temperature differences and affect the growth of crops.

[0052] As a further embodiment, the human-computer interaction module is used to display relevant data to the user, specifically including: The module allows users to set the target temperature and the allowable temperature deviation range, and displays the real-time temperature data of each area and the working status of the electric heating film to the user.

[0053] It should be noted that the human-computer interaction module allows operators to set parameters such as target temperature and deviation range, and view the real-time temperature of the area and the status of the electric heating film. The interface is simple and intuitive, and is easy to operate and monitor.

[0054] How it works First, during the planning and construction phase of the greenhouse, the installation location of the temperature sensor is reasonably determined according to the shape, size and cultivation layout of the greenhouse to ensure that the temperature conditions in different areas of the greenhouse can be fully and accurately reflected; after the system is started, the data acquisition module continues to work, and the data analysis and decision-making module continuously analyzes the data and directs the control execution module to act; for example, in the winter morning when the sun shines, the cultivation bed on the east side may heat up faster, and it is difficult to reduce the temperature to a suitable temperature by adjusting the power of the electric heating film. The data analysis and decision-making module starts the adaptive auxiliary module to appropriately assist ventilation and cooling; and the west side is low due to insufficient light, and it is difficult to heat up to a suitable temperature by adjusting the power of the electric heating film. At this time, the adaptive auxiliary module on the west side is started to slowly heat up; through such cyclic monitoring and regulation, the greenhouse can maintain a relatively uniform temperature distribution in different seasons and at different times, creating a good thermal environment for crop growth.

[0055] The above are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technical staff in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of this template.

Claims

1. Solar greenhouse wintering production electric heating film heating control system, characterized by: include: The crop distribution monitoring module is used to collect the location distribution of crops in the greenhouse and determine the temperature required for the growth of different crops; The area division module divides the greenhouse into different areas in a matrix manner according to the shape and area of ​​the greenhouse; A data acquisition module, which acquires and pre-processes first environmental information after the area division module divides the interior of the greenhouse into different areas, wherein the first environmental information at least includes room temperature data; A data analysis and decision module receives the first environmental information transmitted by the data acquisition module, processes the temperature data based on the temperature uniformity model, determines the area to be regulated and the regulation range, and obtains the heating power adjustment amount required for the electric heating film in each area; A control execution module receives the instructions sent by the data analysis and decision module and accurately controls the electric heating film power in each area; An adaptive auxiliary module, after the control execution module completes the execution of the control instruction, assists in raising the temperature for the temperature deviation area, and assists in lowering the temperature for the temperature high area; Human-computer interaction module, used to display relevant data to users.

2. The solar greenhouse overwintering production electric heating film heating control system according to claim 1 is characterized in that: The temperature data is processed based on the temperature uniformity model, and the specific steps are as follows: The temperature of each area collection point is collected; Calculate the average temperature of all regional collection points as the reference temperature ; For each collection point i, calculate the difference between the current collection point temperature and the reference temperature ; Pre-set temperature difference threshold ; like , a first result is generated and a first operation is performed.

3. The solar greenhouse overwintering production electric heating film heating control system according to claim 2 is characterized in that: The generating of the first result and performing the first operation specifically includes: Determine that the area where the collection point is located is a control area; Combined with the current temperature deviation ( ) size to calculate the required heating power adjustment amount for the electric heating film in this area.

4. The solar greenhouse overwintering production electric heating film heating control system according to claim 3 is characterized in that: The adaptive adjustment module includes a ventilation module, and the specific working process is as follows: Determine a temperature coefficient (when 0:00); Calculate the ventilation correction factor ; in accordance with Determine the initial ventilation volume of the ventilation module ; Calculate actual ventilation volume ; By formula Get ventilation time.

5. The solar greenhouse overwintering production electric heating film heating control system according to claim 1 is characterized in that: The temperature coefficient is determined The specific steps are: Determine the current sunlight intensity ; Through empirical formula Conclude.

6. The electric heating film heating control system for wintering production in a solar greenhouse according to claim 5 is characterized in that: The self-adaptive adjustment module also includes a sunshade module, and the specific working process is as follows: Calculate the shade area ; Calculate the duration of shading ; Adjust the shading area ratio in real time.

7. The solar greenhouse overwintering production electric heating film heating control system according to claim 6 is characterized in that: The adaptive adjustment module also includes a heating compensation module, and the specific working process is as follows: set up is the temperature deviation (when 0:00); According to the formula ; in, is a preset time period parameter used to control the period of the sine function. To set the temperature, is the current temperature, is the basic heating power, t is the heating duration; Setting power cap ,when hour, , and trigger an alarm.

8. The solar greenhouse overwintering production electric heating film heating control system according to claim 7 is characterized in that: The calculated ventilation correction factor Specifically: Determine the temperature and internal air humidity H; Determine the current outdoor wind speed ; According to the formula Derive the ventilation correction factor.

9. The solar greenhouse overwintering production electric heating film heating control system according to claim 8, characterized in that: The precise control of the electric heating film power in each area includes: Re-order crops based on the temperature required in each area; The temperature required by the crops is in the middle value as the midpoint position; The required temperatures of crops are arranged in increasing order from the starting point to the midpoint; The required temperatures of crops are arranged in decreasing order from midpoint to key point; Based on the above, the positions of crops are sorted again.

10. The solar greenhouse overwintering production electric heating film heating control system according to claim 9, characterized in that: The human-computer interaction module is used to display relevant data to the user, specifically including: The module allows users to set the target temperature and the allowable temperature deviation range, and displays the real-time temperature data of each area and the working status of the electric heating film to the user.

Images