A constant temperature and dehumidification system and its regulation and control method for an air conditioner used in grain warehouses

Abstract

This invention provides a constant temperature and dehumidification system and control method for a grain silo air conditioner, comprising: an air duct and an air outlet for supplying fresh air; a temperature and humidity sensor and an electric air valve are installed at the air outlet, and the airflow at the air outlet is controlled by adjusting the opening of the electric air valve; fluid in the temperature control pipeline is used to exchange heat with the air entering the air outlet; an electronic expansion valve is installed on the refrigeration pipeline of the air conditioner, located between the evaporator and condenser of the air conditioner; a controller is connected to the temperature and humidity sensor and the electric air valve respectively, and the controller controls the opening of the electronic expansion valve according to the signal from the temperature and humidity sensor to adjust the humidity of the grain silo; the controller calculates the required airflow at the air outlet according to the signal transmitted by the temperature and humidity sensor, thereby controlling the opening of the electric air valve to adjust the temperature of the grain silo, thus solving the technical problem of high energy consumption and high cost of grain storage silos in existing constant temperature and dehumidification control methods in related technologies.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology in grain warehouses, specifically to a constant temperature and dehumidification system and control method for an air conditioner used in grain warehouses. Background Technology

[0002] After a bountiful harvest, grain needs to be stored in granaries. However, the storage time is closely related to the temperature and humidity of the storage environment. Excessively high temperatures and low humidity will affect the taste and quality of the grain. Therefore, granaries need to be kept under constant temperature and humidity control to maintain the grain in optimal condition.

[0003] During the dehumidification process of grain silos, the temperature drops due to the moisture in the liquefied air. To maintain a constant temperature inside the silo, it is necessary to raise the temperature. Existing grain silo constant temperature and dehumidification air conditioning technology typically uses electric heating wires to heat the air outlet for constant temperature and dehumidification. Although this method is simple and easy to implement, it has disadvantages such as high energy consumption, low efficiency, and easy equipment damage.

[0004] Therefore, existing technologies need further development. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a constant temperature and dehumidification system and regulation and control method for grain warehouse air conditioners, so as to solve the technical problem that the existing constant temperature and dehumidification regulation and control methods for grain warehouses have high energy consumption, resulting in high costs for grain storage warehouses.

[0006] To achieve the above technical objectives, the present invention adopts the following technical solution: A constant temperature and dehumidification system for a grain silo air conditioner is provided, comprising: an air duct leading to the grain silo for ventilation; the air duct having an air outlet for supplying fresh air; a temperature and humidity sensor and an electric air valve installed at the air outlet; the airflow at the air outlet being controlled by adjusting the opening of the electric air valve; a temperature control pipeline installed at the air outlet; the fluid in the temperature control pipeline being used for heat exchange with the air entering the air outlet; an electronic expansion valve installed on the air conditioner's refrigeration pipeline, located between the evaporator and condenser of the air conditioner; and a controller connected to the temperature and humidity sensor and the electric air valve respectively; the controller controlling the opening of the electronic expansion valve according to the signal from the temperature and humidity sensor to regulate the humidity of the grain silo; and the controller calculating the required airflow at the air outlet based on the signal from the temperature and humidity sensor, and controlling the opening of the electric air valve according to the required airflow to regulate the temperature of the grain silo.

[0007] Furthermore, one end of the temperature control line is connected to the fluid inlet of the condenser, and the other end of the temperature control line is connected to the fluid outlet of the condenser.

[0008] Furthermore, the condenser is a finned condenser.

[0009] Furthermore, a liquid supply filter is installed on the refrigeration pipeline, located between the evaporator and the electronic expansion valve.

[0010] Furthermore, a shut-off valve is installed on the temperature control pipeline. The shut-off valve is used to open or close the temperature control pipeline, and the controller is connected to the shut-off valve via a signal connection.

[0011] A regulation and control method is applied to the constant temperature and dehumidification system of the grain silo air conditioner described above. The regulation and control method includes: setting an initial humidity Fs, and monitoring the actual humidity Fs1 through a temperature and humidity sensor; when Fs1≠Fs, the controller starts the constant temperature and dehumidification system; determining the relationship between Fs1 and Fs, if Fs1>Fs, the opening degree Ks of the electronic expansion valve decreases; if Fs1<Fs, the opening degree Ks of the electronic expansion valve increases; the air at the air outlet exchanges heat with the fluid in the temperature control pipeline, and the required air volume f1 at the air outlet is calculated based on the air outlet temperature T3 after heat exchange, and the opening degree K1 of the electric air valve is adjusted until the temperature inside the grain silo reaches a suitable temperature T.

[0012] Furthermore, the actual opening degree Ks1 of the electronic expansion valve is calculated according to the following formula: Ks1=Ks+Xs(Fs1-Fs), where Xs is the correction coefficient for the opening degree of the electronic expansion valve and the humidity.

[0013] Furthermore, the opening degree K1 of the electric damper is calculated as follows: K1 = K f1 / f, where K is the initial opening degree of the electric damper and f is the initial air volume of the outlet.

[0014] Furthermore, the required air volume f1 is calculated as follows: f1 = (T - T2) / (Ka) T3), where T2 is the actual temperature of the grain warehouse and Ka is the proportionality coefficient.

[0015] Furthermore, the proportionality coefficient Ka is calculated as follows: ka = t / V, where t is the dehumidification time and V is the volume of the grain silo.

[0016] Furthermore, the proportionality constant Ka is obtained through the following formula: T = f t T1 / V, where T1 is the initial temperature at the air outlet before heat exchange.

[0017] Beneficial effects:

[0018] 1. The constant temperature and dehumidification system of the grain warehouse air conditioner of the present invention has a temperature control pipeline installed on the condenser and extended to the air outlet. When the system is dehumidifying, the shut-off valve on the condenser is opened to draw in air, and the high temperature refrigerant in the condenser is used to heat the air supply, which effectively saves energy, further controls the storage cost of grain, and reduces costs.

[0019] 2. The constant temperature and dehumidification system of the grain warehouse air conditioner of the present invention uses the refrigerant in the system to control the temperature of the air outlet when dehumidifying through the electronic expansion valve, and at the same time uses the electric air valve of the air outlet to control the air volume of the air outlet, so as to ensure that the temperature inside the grain warehouse remains unchanged and achieve effective constant temperature.

[0020] 3. The adjustment and control method of the present invention can effectively control the temperature and humidity inside the grain warehouse, ensuring that the grain is stored in an optimal environment and extending its shelf life.

[0021] 4. Using the regulation and control method of the present invention, the constant temperature and dehumidification system is used to monitor and control the humidity and temperature in the grain warehouse, prevent the grain from getting damp or over-drying, improve the taste and quality of stored grain, and provide people with better food. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the air outlet of the constant temperature and dehumidification system of the grain warehouse air conditioner used in this embodiment of the invention.

[0023] Figure 2 This is a schematic diagram of the constant temperature and dehumidification system of the grain warehouse air conditioner used in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the temperature control pipeline of the constant temperature and dehumidification system of the grain warehouse air conditioner used in this embodiment of the invention;

[0025] Figure 4 This is a control flowchart of the dehumidification regulation and control method used in the embodiments of the present invention.

[0026] The above figures include the following reference numerals:

[0027] 1. Air duct; 11. Air outlet; 2. Temperature and humidity sensor; 3. Electric air valve; 4. Temperature control pipeline; 41. Shut-off valve; 5. Electronic expansion valve; 6. Refrigeration pipeline; 7. Evaporator; 8. Condenser; 9. Liquid supply filter. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0029] According to an embodiment of the present invention, a constant temperature and dehumidification system for an air conditioner used in grain storage is provided. Please refer to [link to relevant documentation]. Figures 1 to 3 The system includes: an air duct 1 leading to the grain silo for ventilation; an air outlet 11 for supplying fresh air; a temperature and humidity sensor 2 and an electric air valve 3 installed at the air outlet 11; the airflow at the air outlet 11 is controlled by adjusting the opening of the electric air valve 3; a temperature control pipe 4 located at the air outlet 11, with fluid in the pipe used for heat exchange with the air entering the outlet 11; an electronic expansion valve 5 located on the refrigeration pipe 6 of the air conditioner, between the evaporator 7 and the condenser 8; and a controller connected to both the temperature and humidity sensor 2 and the electric air valve 3. The controller controls the opening of the electronic expansion valve 5 based on the signal from the temperature and humidity sensor 2 to regulate the humidity of the grain silo. The controller also calculates the required airflow at the air outlet 11 based on the signal from the temperature and humidity sensor 2 and controls the opening of the electric air valve 3 to regulate the temperature of the grain silo.

[0030] In the constant temperature and dehumidification system of the grain silo air conditioner in this embodiment, an electronic expansion valve 5 is installed on the air conditioning pipe 6 and between the evaporator 7 and the condenser 8. The opening of the electronic expansion valve 5 is adjusted to control the humidity of the grain silo. Specifically, the dehumidification principle is as follows: the evaporator 7 in the constant temperature and dehumidification system of the air conditioner draws in air from the grain silo, and then the refrigerant in the evaporator 7 lowers the temperature of the air in the grain silo, causing the moisture in the air to condense into water droplets. These water droplets are collected in a water tray below the evaporator 7, thereby reducing the humidity in the air. However, during the liquefaction process of the moisture in the grain silo condensing into water droplets, the temperature inside the grain silo will decrease. In order to ensure that the temperature inside the grain silo remains constant, the temperature inside the grain silo needs to be controlled during the dehumidification process. The temperature control method adopted is: a temperature control pipe 4 is installed at the air outlet 11 of the air conditioner. The fluid in the temperature control pipe 4 is used to exchange heat with the air entering the air outlet 11, raising the temperature of the air at the air outlet 11, and then blowing it into the grain silo through the air duct 1 of the air conditioner, thereby increasing the temperature inside the grain silo. The constant temperature and dehumidification system of the grain silo air conditioner in this embodiment only requires passing a high-temperature fluid through the temperature control pipe 4 to exchange heat with the air outside the pipe 4, thus achieving temperature raising inside the grain silo. Compared with existing electric heating wire methods, this system is more energy-efficient and reduces grain storage costs. The constant temperature and dehumidification system of the grain silo air conditioner in this embodiment solves the technical problem of high energy consumption and high storage costs in existing grain silo constant temperature and dehumidification control methods.

[0031] See Figure 2 and Figure 3 In the constant temperature and dehumidification system of the grain silo air conditioner in this embodiment, one end of the temperature control pipe 4 is connected to the fluid inlet of the condenser 8, and the other end of the temperature control pipe 4 is connected to the fluid outlet of the condenser 8. Air is drawn from one side of the condenser 8 to divert a portion of the refrigerant, forming the temperature control pipe 4. This portion of the refrigerant is used to heat the air at the air outlet 11. When the moisture in the air condenses into water droplets, the humidity in the air decreases, and the air temperature also drops. To maintain a comfortable indoor temperature, the constant temperature and dehumidification system heats the refrigerant in the condenser 8, causing it to rise in temperature and thus evaporating the moisture in the air, further reducing the humidity. The humidity in the grain silo is controlled through the cooperation of the evaporator 7 and the condenser 8, thereby optimizing the ambient temperature inside the grain silo. The high-temperature refrigerant generated in the air conditioning system is used at the air outlet 11 to exchange heat with the air supplied to the grain silo, achieving resource reuse, further achieving energy-saving effects, and further controlling grain storage costs. At the same time, the constant temperature and humidity inside the grain warehouse further ensures the taste and quality of the grain, providing people with better food.

[0032] See Figure 2In the constant temperature and dehumidification system of the grain silo air conditioner in this embodiment, the condenser 8 is a finned condenser. A finned condenser is a high-efficiency heat exchanger that uses fins as heat transfer elements. It exchanges heat with the air inside the grain silo during the refrigerant's condensation process, carrying away the refrigerant's heat and thus condensing the refrigerant, which is more conducive to dehumidification. Furthermore, the biggest advantage of a finned condenser is its larger surface area, which allows for faster cooling of the refrigerant. Simultaneously, the finned structure also increases the efficiency of heat conduction and heat exchange, which is beneficial for improving the heat exchange efficiency of the air at the outlet 11, making the entire system more efficient.

[0033] See Figure 2 In the constant temperature and dehumidification system of the grain silo air conditioner of this embodiment, a liquid supply filter 9 is installed on the refrigeration pipe 6, located between the evaporator 7 and the electronic expansion valve 5. The main function of the liquid supply filter 9 on the refrigeration pipe 6 of the evaporator 7 is to remove residual moisture, impurities, and acidic substances from the refrigeration pipe 6. Furthermore, the liquid supply filter 9 can compensate for and adjust the refrigerant loss to prevent a large amount of refrigerant from accumulating in the evaporator 7 after the compressor stops, thus avoiding liquid return and damage to the air conditioner upon the next startup. The liquid supply filter 9 is located downstream of the evaporator 7 and upstream of the electronic expansion valve 5, also protecting the electronic expansion valve 5 and ensuring its normal operation in the constant temperature and dehumidification system.

[0034] See Figure 3 In the constant temperature and dehumidification system of the grain silo air conditioner in this embodiment, a shut-off valve 41 is installed on the temperature control pipeline 4. The shut-off valve 41 is used to open or close the temperature control pipeline 4, and the controller is signal-connected to the shut-off valve 41. When the air conditioner needs to perform dehumidification operation, it transmits a signal to the controller, which opens the shut-off valve 41, thereby opening the temperature control pipeline 4 and allowing the high-temperature refrigerant in the temperature control pipeline 4 to exchange heat with the air at the air outlet 11. If the air conditioner does not perform dehumidification operation, the shut-off valve 41 is in the closed state, so that the refrigerant can flow in the condenser 8 and exchange heat with the cooling medium.

[0035] See Figure 4 In this embodiment, the adjustment and control method is applied to the constant temperature and dehumidification system of the grain warehouse air conditioner as described above. The control method includes: setting an initial humidity Fs, and monitoring the actual humidity Fs1 through the temperature and humidity sensor 2; when Fs1≠Fs, the controller turns on the constant temperature and dehumidification system; judging the relationship between Fs1 and Fs, if Fs1>Fs, the opening degree Ks of the electronic expansion valve 5 decreases; if Fs1<Fs, the opening degree Ks of the electronic expansion valve 5 increases; the air from the air outlet 11 exchanges heat with the fluid in the temperature control pipeline 4, and the required air volume f1 of the air outlet 11 is calculated based on the air outlet temperature T3 after heat exchange, and the opening degree K1 of the electric air valve 3 is adjusted until the temperature inside the grain warehouse reaches a suitable temperature T.

[0036] The regulation and control method in this embodiment includes a dehumidification regulation and control method and a constant temperature regulation and control method. A temperature and humidity sensor 2 is installed at the air outlet 11 of the grain silo air conditioner to monitor the humidity at the air outlet 11 in real time and transmit the temperature and humidity data to the controller. After receiving the temperature and humidity data, the controller calculates the required opening degree Ks of the electronic expansion valve 5 based on the preset initial humidity Fs and the actual humidity Fs1. Precise humidity control is achieved by automatically adjusting the opening degree of the electronic expansion valve 5. The controller also automatically adjusts the operating state of the air conditioner based on the real-time humidity and the initial humidity Fs to ensure stable humidity control.

[0037] Meanwhile, an electric air valve 3 is installed at the air outlet 11. The air outlet temperature T3 of the air outlet 11 after heat exchange with the refrigerant in the temperature control pipeline 4 is monitored by the temperature and humidity sensor 2. The required air volume f1 of the air outlet 11 is calculated, and the opening degree K1 of the electric air valve 3 is adjusted until the temperature in the grain silo reaches a suitable temperature T, thereby achieving constant temperature regulation and control.

[0038] See Figure 4 In the adjustment and control method of this embodiment, the dehumidification adjustment and control method is as follows:

[0039] Set the initial humidity Fs, and the temperature and humidity sensor 2 monitors the actual humidity Fs1;

[0040] If Fs1≠Fs, turn on the constant temperature dehumidification system;

[0041] After dehumidification time t1, determine the magnitudes of Fs1 and Fs;

[0042] If Fs1 > Fs, the opening degree Ks of the electronic expansion valve 5 decreases;

[0043] If Fs1 < Fs, the opening degree Ks of the electronic expansion valve 5 increases;

[0044] If Fs1 = Fs, maintain the opening degree Ks of the electronic expansion valve 5.

[0045] See Figure 4 In the adjustment and control method of this embodiment, the actual opening degree Ks1 of the electronic expansion valve 5 is calculated according to the following formula: Ks1=Ks+Xs(Fs1-Fs), where Xs is the correction coefficient of the opening degree of the electronic expansion valve and the humidity.

[0046] See Figure 4 In the adjustment and control method of this embodiment, the opening degree K1 of the electric air valve 3 is calculated as follows: K1 = K f1 / f, where K is the initial opening degree of the electric damper and f is the initial air volume of the outlet.

[0047] See Figure 4, in the adjustment control method of this embodiment, the calculation method of the required air volume f1 is: f1 = (T - T2) / (Ka T3), where T2 is the actual temperature of the granary, and Ka is the proportionality coefficient.

[0048] Refer to Figure 4 , in the adjustment control method of this embodiment, the calculation method of the proportionality coefficient Ka is: ka = t / V, where t is the dehumidification time and V is the volume of the granary.

[0049] Refer to Figure 4 , in the adjustment control method of this embodiment, the proportionality coefficient Ka is obtained through the following formula: T = f t T1 / V, where T1 is the initial temperature at the air outlet 11 before heat exchange.

[0050] In the adjustment control method of this embodiment, the constant temperature adjustment control method is as follows:

[0051] Set a suitable temperature T, the initial temperature T1 at the air outlet 11 before heat exchange, and when the dehumidification of the granary air conditioner starts for a time t, the temperature in the granary reaches T. At this time, according to the formula, we can get: T = f t T1 / V, where the volume in the granary is V and the initial air volume at the air outlet is f.

[0052] When the granary air conditioner starts to dehumidify using the electronic expansion valve 5, the stop valve 41 opens and starts to take gas from the condenser 8. At this time, the high-temperature refrigerant in the condenser 8 heats the air at the air outlet 11. At this time, the temperature T2 (T2 < T) in the granary is detected by the temperature and humidity sensor 2 at the outlet of the granary, and the temperature T3 (T3 > T2) of the air outlet 11 heated by the refrigerant in the condenser 8 is detected by the temperature and humidity sensor 2. According to the formula T = f t T1 / V, it can be calculated that: Ka = t / V, and Ka is the proportionality coefficient.

[0053] Then the required air outlet temperature f1 = (T - T2) / (Ka T3);

[0054] Set the opening degree of the initial electric air valve as K, and the required opening degree of the electric air valve K1 = K f1 / f;

[0055] Calculate the opening degree K1 of the electric air valve 3 through the controller program to control the air volume f1 at the air outlet, so that the temperature in the granary reaches the appropriate temperature T.

[0056] This embodiment proposes a constant temperature and dehumidification system and regulation and control method for a grain warehouse air conditioner. By increasing the temperature of the air outlet 11 through the refrigerant flowing through the condenser 8, the temperature fluctuation inside the grain warehouse is reduced when the grain warehouse air conditioner uses the electronic expansion valve 5 for dehumidification. This achieves precise control of the constant temperature and dehumidification of the grain warehouse air conditioner, effectively reducing temperature fluctuations during the dehumidification process and ensuring the storage quality of the grain.

[0057] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0058] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0059] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0060] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0061] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for regulating and controlling a constant temperature and dehumidification system for an air conditioner used in grain storage, characterized in that, The constant temperature dehumidification system includes: The air duct (1) leads to the grain warehouse for ventilation. The air duct (1) has an air outlet (11) for supplying fresh air. A temperature and humidity sensor (2) and an electric air valve (3) are installed at the air outlet (11). The air volume at the air outlet (11) is controlled by adjusting the opening of the electric air valve (3). Temperature control pipeline (4), the temperature control pipeline (4) is located at the air outlet (11), and the fluid in the temperature control pipeline (4) is used to exchange heat with the air entering the air outlet (11); An electronic expansion valve (5) is installed on the refrigeration pipe (6) of the air conditioner and is located between the evaporator (7) and the condenser (8) of the air conditioner. The controller is connected to the temperature and humidity sensor (2) and the electric air valve (3) respectively. The controller controls the opening of the electronic expansion valve (5) according to the signal of the temperature and humidity sensor (2) to adjust the humidity of the grain silo. The controller calculates the required air volume of the air outlet (11) according to the signal transmitted by the temperature and humidity sensor (2), and controls the opening of the electric air valve (3) according to the required air volume to adjust the temperature of the grain silo. The adjustment and control method includes: An initial humidity Fs is set, and the actual humidity Fs1 is monitored by the temperature and humidity sensor (2); When Fs1≠Fs, the controller activates the constant temperature and dehumidification system; Determine the relationship between Fs1 and Fs. If Fs1 > Fs, the opening degree Ks of the electronic expansion valve (5) decreases; if Fs1 < Fs, the opening degree Ks of the electronic expansion valve (5) increases. The air from the air outlet (11) exchanges heat with the fluid in the temperature control pipeline (4). The required air volume f1 of the air outlet (11) is calculated by the air outlet temperature T3 after heat exchange. The opening degree K1 of the electric air valve (3) is adjusted until the temperature in the grain silo reaches a suitable temperature T. The actual opening degree Ks1 of the electronic expansion valve (5) is calculated according to the following formula: Ks1=Ks+Xs(Fs1-Fs), where Xs is the correction coefficient of the opening degree of the electronic expansion valve and the humidity. The opening degree K1 of the electric air valve (3) is calculated as follows: K1 = K f1 / f, where K is the initial opening of the electric damper and f is the initial air volume at the outlet; The required air volume f1 is calculated as follows: f1 = (T - T2) / (Ka) T3), where T2 is the actual temperature of the grain warehouse, and Ka is the proportionality coefficient; The proportionality coefficient Ka is calculated as follows: ka = t / V, where t is the dehumidification time and V is the grain silo volume.

2. The adjustment and control method for the constant temperature and dehumidification system of the grain warehouse air conditioner according to claim 1, characterized in that, One end of the temperature control pipeline (4) is connected to the fluid inlet of the condenser (8), and the other end of the temperature control pipeline (4) is connected to the fluid outlet of the condenser (8).

3. The adjustment and control method for the constant temperature and dehumidification system of the grain warehouse air conditioner according to claim 2, characterized in that, The condenser (8) is a finned condenser.

4. The adjustment and control method for the constant temperature and dehumidification system of the grain silo air conditioner according to claim 3, characterized in that, A liquid supply filter (9) is provided on the refrigeration pipeline (6), and the liquid supply filter (9) is located between the evaporator (7) and the electronic expansion valve (5).

5. The adjustment and control method for the constant temperature and dehumidification system of the grain silo air conditioner according to claim 1, characterized in that, A shut-off valve (41) is provided on the temperature control pipeline (4). The shut-off valve (41) is used to open or close the temperature control pipeline (4). The controller is signal-connected to the shut-off valve (41).

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