A closed cowshed precision ventilation cooling system and regulation method

Abstract

The application discloses a closed cowshed precise ventilation cooling system and a regulation and control method, wherein a ventilation pipeline is connected with an indirect evaporative cooling system, the ventilation pipeline adopts a reduced-diameter pipe, the diameter of the ventilation pipeline far from the indirect evaporative cooling system is smaller than the diameter of the ventilation pipeline close to the indirect evaporative cooling system, and a plurality of air supply holes are arranged on the ventilation pipeline at intervals; the regulation and control method comprises the following steps: acquiring the temperature inside and outside the cowshed, if the temperature outside the cowshed is less than or equal to a set value, controlling an intelligent two-way ball valve to open for ventilation mode, and if the temperature outside the cowshed is greater than the set value, controlling a spraying mechanism of the indirect evaporative cooling system to open for cooling mode. The application can realize precise and uniform air supply, can also take into account the environmental stability inside the cowshed, can make the fresh air directly and completely cover the cow activity area, and can effectively improve the air environment inside the closed cowshed and reduce the disease risk of the cows in the cowshed by cooperating with the centralized exhaust of the ventilation ridge. The application has a compact structure, greatly reduces the number of cowshed fans, saves the cost and reduces the energy consumption.

Description

Technical Field

[0001] This invention belongs to the field of ventilation and cooling technology for enclosed cattle sheds, specifically relating to a precision ventilation and cooling system and control method for enclosed cattle sheds. Background Technology

[0002] The temperature and humidity parameters inside the cattle shed are related to the growth, health, and production performance of cattle. Excessive temperature in summer can easily cause heat stress in cattle, which manifests as increased respiratory rate, rapid heartbeat and pulse, elevated body temperature, decreased feed intake, continuously increased water intake, disordered estrus or anestrus, and restless behavior. In addition, heat stress can also induce various diseases in cattle, including mastitis, which seriously damages the health of cattle and affects their milk production performance, causing huge economic losses.

[0003] Currently, cattle sheds mainly use evaporative cooling systems with fans and sprinkler systems to enhance ventilation and heat dissipation, but these methods cannot effectively achieve precise cooling. Research shows that precision ventilation systems based on variable-diameter pipes are more conducive to simultaneously cooling large areas of cattle in enclosed cattle sheds, improving the practicality of the cooling system. In existing technology, the targeted ventilation device for alleviating heat stress in cattle disclosed in literature CN103004612B combines variable-diameter pipes and sprinkler pipes to cool cattle simultaneously. However, this scheme only opens a single ventilation opening aimed at the neck of the cattle. In reality, without absolutely restricting the cattle's movement, it is difficult to guarantee the targeted cooling effect and cannot achieve uniform cooling throughout the entire enclosed cattle shed.

[0004] More importantly, due to the large space inside the cattle shed, the existing precision ventilation system still faces the problem of long temperature control response time (the time required for at least five points inside the cattle shed to reach the target temperature from the set target temperature). Taking a closed cattle shed with a height of 3 meters, a width of 4 meters, and a length of 50 meters as an example, when using a set of rectangular reducer pipes (the rectangular reducer pipe has multiple spaced air outlets on its side wall, the distance between the top surface of the rectangular reducer pipe and the top wall of the cattle shed is 0.4 meters, the distance between the center line of the rectangular reducer pipe and the ground is 2.4 meters, the length of the rectangular reducer pipe is 49.5 meters, and the inlet size of the rectangular reducer pipe is 0.4 m * 0.4 m), its temperature control response time is as long as about three minutes. Summary of the Invention

[0005] In view of the technical problems mentioned in the background art, the purpose of this invention is to provide a precise ventilation and cooling system and control method for enclosed cattle sheds.

[0006] The present invention adopts the following technical solution.

[0007] A precision ventilation and cooling system for a closed cattle shed includes a ventilation duct arranged horizontally inside the closed cattle shed. The ventilation duct is connected to an indirect evaporative cooling system. External airflow enters the ventilation duct after passing through the indirect evaporative cooling system. The ventilation duct is a reduced-diameter pipe, and the diameter of the ventilation duct further away from the indirect evaporative cooling system is smaller than the diameter of the ventilation duct closer to the indirect evaporative cooling system. Several air supply holes are provided at intervals on the ventilation duct.

[0008] Furthermore, the indirect evaporative cooling system includes multiple boxes connected in series, each box is equipped with an evaporative cooling core, each box has an air inlet and an air outlet on its side wall, with the air inlet facing the air outlet, and each box has an exhaust fan at the secondary exhaust port on the top of the box, with a baffle plate at the exhaust fan to prevent water vapor from entering the fan.

[0009] Furthermore, the indirect evaporative cooling system is connected to the ventilation duct via a chamber, with a side air intake channel at the bottom of the chamber and an intelligent two-way ball valve installed on the side air intake channel.

[0010] Furthermore, the external airflow is divided into two parts after being cooled by the evaporative cooling core in the first chamber. The first part of the airflow enters the heat medium channel of the evaporative cooling core in the second chamber and is cooled there. The second part of the airflow enters the cold medium channel of the evaporative cooling core in the second chamber and exits vertically through the outlet of the cold medium channel into the secondary exhaust port of the second chamber. The airflow flowing out of the cold medium channel in the second chamber is again divided into two parts. One part of the airflow enters the heat medium channel of the evaporative cooling core in the third chamber and is cooled there. This part of the airflow enters the chamber as fresh air. The other part of the airflow enters the cold medium channel of the evaporative cooling core in the third chamber and exits vertically through the outlet of the cold medium channel into the secondary exhaust port of the third chamber.

[0011] Furthermore, the indirect evaporative cooling system also includes a spray mechanism, which includes a water collection tank located at the bottom of the housing. The space inside the water collection tank also serves as an air duct for the cooling medium. The water collection tank is connected to the top of the evaporative cooling core via a pipeline with a circulating water pump, and a spray nozzle is installed at the upper end of the pipeline.

[0012] Furthermore, a ventilated roof ridge is installed on the top of the enclosed cattle shed.

[0013] To effectively reduce the temperature control response time in the cattle shed, as one preferred solution, the ventilation duct includes several gourd-shaped segments and a narrowed inner tube inserted inside the gourd-shaped segments. The narrowed inner tube has 2-4 through holes evenly arranged on it. Each gourd-shaped segment includes a large hollow sphere and a small hollow sphere, which are connected together by a throat. Both the large and small hollow spheres have multiple air outlets facing different directions, with some air outlets located in the lower half of the large and small hollow spheres. After the cold airflow from the indirect evaporative cooling system enters the narrowed inner tube, it is distributed to each of the large and small hollow spheres through the through holes, and then delivered to the sealed cattle shed through the air outlets on the large and small hollow spheres.

[0014] To effectively reduce the temperature control response time in the cattle shed, as a second preferred option, the ventilation duct includes several gourd-shaped segments. Each gourd-shaped segment includes a large hollow sphere and a small hollow sphere. The large and small hollow spheres are connected together through a throat joint. Both the large and small hollow spheres are provided with multiple air outlets facing different directions, with the air outlets located in the lower half of the large and small hollow spheres. The cold airflow from the indirect evaporative cooling system enters each large and small hollow sphere sequentially, and then is delivered to the sealed cattle shed through the air outlets on the large and small hollow spheres.

[0015] A control method using the aforementioned precision ventilation and cooling system for closed cattle sheds includes the following steps:

[0016] S1, using a temperature sensor module to obtain the temperature inside the sealed cattle shed and the temperature outside the sealed cattle shed in real time;

[0017] S21, if the outside temperature is less than or equal to the set value, control the intelligent two-way ball valve to open and enter the ventilation mode. Then, when the inside temperature is just within the control temperature range, stabilize the opening of the intelligent two-way ball valve to maintain this state. When the inside temperature is outside the control temperature range, adjust the ventilation temperature by adjusting the opening and closing degree of the intelligent two-way ball valve.

[0018] S22, If the outside temperature is greater than the set value, control the spray mechanism of the indirect evaporative cooling system to start the cooling mode.

[0019] First, obtain the required and minimum ventilation volumes for the enclosed cattle shed;

[0020] If the required ventilation volume is less than or equal to the minimum ventilation volume, the required ventilation volume is set to the minimum ventilation volume. Then, the intelligent two-way ball valve is opened and ventilation mode is activated. Subsequently, when the temperature inside the building is just within the control temperature range, the opening of the intelligent two-way ball valve is stabilized to maintain this state. When the temperature inside the building is outside the control temperature range, the ventilation temperature is adjusted by adjusting the opening and closing degree of the intelligent two-way ball valve.

[0021] If the required ventilation volume is greater than the minimum ventilation volume, the preset ventilation volume will be set to the required ventilation volume. Then, if the indoor temperature is within the controlled temperature range, this state will be maintained; if the indoor temperature is outside the controlled temperature range, the ventilation volume will be adjusted by adjusting the fan speed.

[0022] Beneficial effects: The solution of this invention can achieve precise and uniform air supply only to the area below the ventilation duct, while taking into account the environmental stability inside the barn. Fresh air directly and completely covers the cattle's activity area, and combined with the centralized exhaust from the ventilation ridge, it effectively improves the air environment inside the enclosed cattle barn, reducing the risk of disease in the cattle. More importantly, this solution significantly shortens the temperature control response time in the enclosed cattle barn, controlling it to about half a minute, with relatively less loss of cold air. This invention overcomes the limitations of traditional wet curtain fan cooling systems, reducing the air temperature to near the dew point temperature, thus improving cooling efficiency. This invention has both cooling and ventilation modes, suitable for environmental control in enclosed cattle barns with different climates. Its compact structure significantly reduces the number of cattle barn fans, saving costs and reducing energy consumption. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the precision ventilation and cooling system for the enclosed cattle shed in Example 1;

[0024] Figure 2 This is a schematic diagram of the precision ventilation and cooling system for the enclosed cattle shed in Example 2;

[0025] Figure 3 This is a schematic diagram of the ventilation ducts of the precision ventilation and cooling system for the closed cattle shed in Example 2;

[0026] Figure 4 This is a schematic diagram of the airflow field in the ventilation duct of the precision ventilation and cooling system for the closed cattle shed in Example 2;

[0027] Figure 5 This is a lateral schematic diagram of the precision ventilation and cooling system for the enclosed cattle shed in Example 2;

[0028] Figure 6 This is a schematic diagram of the precision ventilation and cooling system for the enclosed cattle shed in Example 3;

[0029] Figure 7 This is a schematic diagram of the control logic for the precise ventilation and cooling system in the enclosed cattle shed described in the embodiment. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0031] Combination Figure 1 As shown, a precision ventilation and cooling system for a closed cattle shed includes a ventilation duct 1 horizontally arranged within the closed cattle shed 8. The top of the closed cattle shed 8 is equipped with a ventilation ridge 25. The ventilation duct 1 is connected to an indirect evaporative cooling system 2. External airflow is cooled by the indirect evaporative cooling system 2 before entering the ventilation duct 1. The ventilation duct 1 uses a reduced-diameter pipe, and the diameter of the ventilation duct 1 furthest from the indirect evaporative cooling system 2 is smaller than the diameter of the ventilation duct 1 closest to the indirect evaporative cooling system 2. Several air supply holes 22 are spaced apart on the ventilation duct 1. In this embodiment, the top surface of the rectangular ventilation duct 1 is 0.4m from the top wall of the cattle shed, the centerline of the ventilation duct 1 is 2.4m from the ground, the length of the ventilation duct 1 is 49.5m, and the inlet size of the ventilation duct 1 is 0.4m * 0.4m.

[0032] In this embodiment, the indirect evaporative cooling system 2 includes three boxes connected in series. Each box contains an evaporative cooling core 4. Each box has an air inlet 5 and an air outlet on its side wall, with the air inlet 5 facing the air outlet. Each box has an exhaust fan 6 at its secondary exhaust port 7 on top, and the exhaust fan 6 has a baffle plate 12 to prevent water vapor from entering the fan 3. The indirect evaporative cooling system 2 is connected to the ventilation duct 1 through a chamber 15. A side air inlet channel 13 is provided at the bottom of the chamber 15, and an intelligent two-way ball valve 14 is provided on the side air inlet channel 13.

[0033] In this embodiment, the external airflow is divided into two parts after being cooled by the evaporative cooling core 4 in the first chamber. The first part of the airflow enters the heat medium channel of the evaporative cooling core 4 in the second chamber and is cooled. The second part of the airflow enters the cold medium channel of the evaporative cooling core 4 in the second chamber. After exiting the cold medium channel, the second part of the airflow enters the secondary exhaust port 7 of the second chamber vertically and is discharged. The airflow flowing out of the cold medium channel in the second chamber is divided into two parts again. One part of the airflow enters the heat medium channel of the evaporative cooling core 4 in the third chamber and is cooled. This part of the airflow enters the chamber 15 as fresh air (i.e., cold airflow enters the chamber 15). The other part of the airflow enters the cold medium channel of the evaporative cooling core 4 in the third chamber. After exiting the cold medium channel, the airflow enters the secondary exhaust port 7 of the third chamber vertically and is discharged.

[0034] In this embodiment, the indirect evaporative cooling system 2 also includes a spraying mechanism, which includes a water collection tank 16 located at the bottom of the housing. The water collection tank 16 is connected to the top of the evaporative cooling core 4 via a pipeline with a circulating water pump 17, and a nozzle 11 is provided at the upper end of the pipeline.

[0035] In each embodiment, the temperature sensor module 27 inside the sealed cattle shed 8, the temperature sensor module 26 outside the sealed cattle shed 8, the circulating water pump 17, the intelligent two-way ball valve 14, the exhaust fan 6, and other components are all connected to the controller 28, which controls the operation and pause of these connected components.

[0036] During operation, the outside airflow first enters the evaporative cooling core 4 and is cooled to form cold air (i.e., fresh air). Then it enters the chamber 15, then the ventilation duct 1 and is sent to the sealed cattle shed 8, and finally is discharged through the ventilation ridge 25. When the cold airflow enters the ventilation duct 1 (which is a reduced diameter duct in this example) through the chamber 15, the cold airflow will flow forward along the length of the ventilation duct 1, and this cold airflow will be sent to the sealed cattle shed 8 through each air outlet 22. Example 2

[0037] Combination Figures 2 to 5 As shown, a precision ventilation and cooling system for a closed cattle shed 8 includes a ventilation duct 1 arranged horizontally inside the closed cattle shed 8. The top of the closed cattle shed 8 is provided with a ventilation ridge 25. The ventilation duct 1 is connected to an indirect evaporative cooling system 2. The outside airflow is cooled by the indirect evaporative cooling system 2 and then enters the ventilation duct 1. The ventilation duct 1 is a reduced diameter pipe, and the diameter of the ventilation duct 1 away from the indirect evaporative cooling system 2 is smaller than the diameter of the ventilation duct 1 close to the indirect evaporative cooling system 2. Several air supply holes 22 are provided at intervals on the ventilation duct 1.

[0038] In this embodiment, the indirect evaporative cooling system 2 includes three boxes connected in series. Each box contains an evaporative cooling core 4. Each box has an air inlet 5 and an air outlet on its side wall, with the air inlet 5 facing the air outlet. Each box has an exhaust fan 6 at its secondary exhaust port 7 on top, and the exhaust fan 6 has a baffle plate 12 to prevent water vapor from entering the fan 3. The indirect evaporative cooling system 2 is connected to the ventilation duct 1 through a chamber 15. A side air inlet channel 13 is provided at the bottom of the chamber 15, and an intelligent two-way ball valve 14 is provided on the side air inlet channel 13.

[0039] In this embodiment, the external airflow enters the evaporative cooling core 4 of the first chamber laterally and then splits into two parts. The first part of the airflow is cooled by it and then enters the second chamber, while the second part of the airflow enters the secondary exhaust port 7 of the first chamber vertically and is discharged. The first part of the airflow enters the evaporative cooling core 4 of the second chamber and then splits into two parts again. One part of the airflow is cooled by it and then enters the third chamber, while the other part of the airflow enters the secondary exhaust port 7 of the second chamber vertically and is discharged. The airflow entering the evaporative cooling core 4 of the third chamber is also split into two parts. One part of the airflow is cooled by it and then enters the chamber 15 (i.e., the cold airflow enters the chamber 15), while the other part of the airflow enters the secondary exhaust port 7 of the third chamber vertically and is discharged.

[0040] In this embodiment, the indirect evaporative cooling system 2 also includes a spraying mechanism, which includes a water collection tank 16 located at the bottom of the housing. The water collection tank 16 is connected to the top of the evaporative cooling core 4 via a pipeline with a circulating water pump 17, and a nozzle 11 is provided at the upper end of the pipeline.

[0041] In this embodiment, combined with Figure 3 and Figure 4 As shown, the ventilation duct 1 includes several gourd-shaped segments 31 and a reduced-diameter inner pipe 35 inserted inside the gourd-shaped segments 31. The same cross-section of the reduced-diameter inner pipe 35 is evenly arranged with 2-4 through holes 36. Each gourd-shaped segment 31 includes a large hollow sphere 32 and a small hollow sphere 33. The large hollow sphere 32 and the small hollow sphere 33 are connected together by a throat 34. Both the large hollow sphere 32 and the small hollow sphere 33 are provided with multiple air outlets 22 facing different directions (wherein...). The main air supply hole 23 is only located on the lower half of the circumference of the hollow sphere, while the auxiliary air supply holes 24 are distributed throughout the entire hollow sphere. The air supply hole 22 is located on the lower half of the large hollow sphere 32 and the small hollow sphere 33. After the cold airflow from the indirect evaporative cooling system 2 enters the reduced-diameter inner pipe 35, it is distributed to each of the large hollow sphere 32 and the small hollow sphere 33 through the through hole 36, and then sent to the sealed cattle shed 8 through the air supply holes 22 on the large hollow sphere 32 and the small hollow sphere 33. In this embodiment, the distance between the top surface of the rectangular reduced-diameter inner pipe 35 and the top wall of the cattle shed is 0.4m, the distance between the center line of the reduced-diameter inner pipe 35 and the ground is 2.4m, the length of the reduced-diameter inner pipe 35 is 49.5m, the inlet size of the reduced-diameter inner pipe 35 is 0.4m*0.4m, and the gourd-shaped segment 31 just covers the reduced-diameter inner pipe 35.

[0042] When the cold airflow enters the narrowed-diameter inner tube 35 through the chamber 15, the cold airflow will flow forward along the length of the narrowed-diameter inner tube 35, and this cold airflow will flow radially through each through hole 36 to the inner cavity of each large hollow sphere 32 and small hollow sphere 33, and then be sent to the sealed cattle shed 8 from multiple dimensions through the air outlet 22 on the large hollow sphere 32 and small hollow sphere 33. On the other hand, due to the use of a specific gourd-shaped segment 31 structure, the airflow velocity in the gourd-shaped segment 31 will become faster and faster along the airflow direction of the narrowed-diameter inner tube 35, ensuring that the airflow in all gourd-shaped segments 31 can be smoothly and evenly sent to the sealed cattle shed 8. A small portion of the airflow in the large hollow sphere 32 of the same gourd-shaped segment 31 will flow into the small hollow sphere 33, and a small portion of the airflow in the small hollow sphere 33 of adjacent gourd-shaped segments 31 will flow into the large hollow sphere 33. More importantly, the main airflow 36 (the airflow perpendicular to the axis of the narrowed inner tube 35, i.e., the airflow from the main air outlet 23) flowing out of the large hollow sphere 32 will exhibit a parabolic flow pattern in the same cross-sectional area (the state at this time is as follows). Figure 5 As indicated by the middle arrow), and covering the entire space of the cattle pen 29, the main airflow 36 flowing out from the small hollow sphere 33 also exhibits a parabolic flow pattern in the same cross-sectional area. These main airflows 36 can quickly enter the space below the ventilation duct 1, thereby achieving rapid and uniform cooling. The space 38 between adjacent main airflows 36 and the space above the ventilation duct 1 are mainly filled by airflows that are not perpendicular to the axis of the narrow-diameter inner pipe 35 (that is, the secondary airflow 37 sent out from the secondary air outlet 24). In the traditional scheme, a large part of the main airflow sent out from the ventilation duct 1 needs to flow to the space above the ventilation duct 1 before it can slowly fill the entire cattle pen, and higher flow rates and pressures are required to drive the airflow into the cattle pen. Example 3

[0043] A precision ventilation and cooling system for a closed cattle shed, referring to Example 1 and combined with Figure 6 As shown, the main difference between this and Embodiment 1 is that only the gourd-shaped segment 31 is used as the ventilation duct 1, omitting the reduced-diameter inner pipe 35. Specifically, the ventilation duct 1 includes several gourd-shaped segments 31, each of which includes a large hollow sphere 32 and a small hollow sphere 33. The large hollow sphere 32 and the small hollow sphere 33 are connected together by a throat section 34. Both the large hollow sphere 32 and the small hollow sphere 33 are provided with multiple air outlets 22 facing different directions. The air outlets 22 are located in the lower half of the large hollow sphere 32 and the small hollow sphere 33. The cold airflow from the indirect evaporative cooling system 2 enters each of the large hollow spheres 32 and the small hollow spheres 33 in sequence, and then is delivered to the enclosed cattle shed 8 through the air outlets 22 on the large hollow spheres 32 and the small hollow spheres 33.

[0044] In this embodiment, when the cold airflow enters the narrowed inner tube 35 through the chamber 15, the cold airflow will enter the gourd segment 31 and flow forward along its length. Moreover, this cold airflow will be delivered to the sealed cattle shed 8 from multiple dimensions through the air outlets 22 on each large hollow sphere 32 and small hollow sphere 33. On the other hand, due to the use of a specific gourd segment 31 structure, the airflow velocity in the gourd segment 31 will become faster and faster along the airflow direction, ensuring that the airflow in all gourd segments 31 can be delivered smoothly and evenly to the sealed cattle shed 8. More importantly, the main airflow 36 (airflow perpendicular to the axis of the narrowed inner tube 35) flowing out of the large hollow sphere 32 exhibits a parabolic flow pattern in the same cross-sectional area, and the main airflow 36 flowing out of the small hollow sphere 33 also exhibits a parabolic flow pattern in the same cross-sectional area. These main airflows 36 can quickly enter the space below the ventilation duct 1, thereby achieving rapid and uniform cooling. The space between adjacent main airflows 36 and the space above the ventilation duct 1 are mainly filled by airflows that are not perpendicular to the axis of the narrowed inner tube 35. In contrast, in traditional solutions, a large portion of the main airflow delivered by the ventilation duct 1 needs to flow to the space above the ventilation duct 1 before slowly filling the entire cattle shed, and higher flow velocities and pressures are required to drive the airflow into the cattle shed.

[0045] Comparative Example: Refer to Example 1, the difference being that the indirect evaporative cooling system is omitted.

[0046] A ventilation control experiment was conducted using a closed cattle shed with a height of 3 meters, a width of 4 meters, and a length of 50 meters as an example. Temperature monitoring points were set up in five pens within the closed shed, with a temperature sensor at each end of the pen. The outside air temperature was 38°C, and the target control temperature range inside the closed shed was 23-26°C. The temperature control response time refers to the time required from the end of the set target control temperature until all temperature monitoring points in the pens reached the target temperature. Using the scheme in Comparative Example 1, the required temperature control response time was as long as three minutes and ten seconds, and the lowest temperature that could be lowered was only 32°C; using the scheme in Example 1, the required temperature control response time was two minutes and five seconds; using the scheme in Example 2, the required temperature control response time was forty-six seconds; and using the scheme in Example 3, the required temperature control response time was sixty-two seconds. Example 4

[0047] A control method using any of the precision ventilation and cooling systems in enclosed cattle sheds from Examples 1-3, combined with... Figure 7 As shown, the steps include:

[0048] S1, using a temperature sensor module to obtain the temperature inside the sealed cattle shed and the temperature outside the sealed cattle shed in real time;

[0049] S21, if the outside temperature is less than or equal to the set value, control the intelligent two-way ball valve 14 to open and enter the ventilation mode. Then, when the inside temperature is just within the control temperature range, stabilize the opening of the intelligent two-way ball valve 14 to maintain this state. When the inside temperature is outside the control temperature range, adjust the ventilation temperature by adjusting the opening and closing degree of the intelligent two-way ball valve 14.

[0050] S22, if the outside temperature is greater than the set value, control the spray mechanism of the indirect evaporative cooling system 2 to start the cooling mode;

[0051] First, obtain the required and minimum ventilation volumes for the enclosed cattle shed;

[0052] If the required ventilation volume is less than or equal to the minimum ventilation volume, the required ventilation volume is set to the minimum ventilation volume. Then, the intelligent two-way ball valve 14 is opened and ventilation mode is activated. Subsequently, when the temperature inside the building is just within the control temperature range, the opening of the intelligent two-way ball valve 14 is stabilized to maintain this state. When the temperature inside the building is outside the control temperature range, the ventilation temperature is adjusted by adjusting the opening and closing degree of the intelligent two-way ball valve 14.

[0053] If the required ventilation volume is greater than the minimum ventilation volume, the preset ventilation volume will be set to the required ventilation volume. Then, if the indoor temperature is within the controlled temperature range, this state will be maintained; if the indoor temperature is outside the controlled temperature range, the ventilation volume will be adjusted by adjusting the speed of fan 3.

Claims

1. A precision ventilation and cooling system for a closed cattle shed, comprising a ventilation duct (1) arranged horizontally within the closed cattle shed, characterized in that: Ventilation duct (1) is connected to indirect evaporative cooling system (2). External airflow enters ventilation duct (1) after passing through indirect evaporative cooling system (2). Ventilation duct (1) adopts a reduced diameter pipe, and the diameter of ventilation duct (1) far from indirect evaporative cooling system (2) is smaller than that of ventilation duct (1) close to indirect evaporative cooling system (2). Several air supply holes (22) are provided on ventilation duct (1) at intervals. Indirect evaporative cooling system (2) includes multiple boxes connected in series. Each box is equipped with an evaporative cooling core (4). Each box has an air inlet (5) and an air outlet on its side wall. The air inlet (5) is directly opposite the air outlet. An exhaust fan (6) is provided at the secondary exhaust port (7) at the top of each box. A baffle plate (12) is provided at the exhaust fan (6) to prevent water vapor from entering the fan (3). Indirect evaporative cooling system (2) and ventilation duct (1) are connected through chamber (15). Ventilation duct (1) The system includes several gourd-shaped sections (31). After the external airflow is cooled by the evaporative cooling core (4) in the first box, it is divided into two parts. The first part of the airflow enters the heat medium channel of the evaporative cooling core (4) in the second box and is cooled. The second part of the airflow enters the cold medium channel of the evaporative cooling core (4) in the second box. The second part of the airflow exits through the cold medium channel and enters the secondary exhaust port (7) of the second box vertically and is discharged. The airflow flowing out from the cold medium channel in the second box is divided into two parts again. One part of the airflow enters the heat medium channel of the evaporative cooling core (4) in the third box and is cooled. This part of the airflow enters the chamber (15) as fresh air. The other part of the airflow enters the cold medium channel of the evaporative cooling core (4) in the third box. The airflow exiting through the cold medium channel enters the secondary exhaust port (7) of the third box vertically and is discharged.

2. The precision ventilation and cooling system for enclosed cattle sheds according to claim 1, characterized in that: A side air inlet channel (13) is provided at the bottom of the chamber (15), and an intelligent two-way ball valve (14) is provided on the side air inlet channel (13).

3. The precision ventilation and cooling system for enclosed cattle sheds according to claim 2, characterized in that: The indirect evaporative cooling system (2) also includes a spray mechanism, which includes a water collection tank (16) located at the bottom of the box. The space inside the water collection tank (16) also serves as the air duct for the cold medium channel. The water collection tank (16) is connected to the top of the evaporative cooling core (4) through a pipeline with a circulating water pump (17). A nozzle (11) is provided at the upper end of the pipeline.

4. The precision ventilation and cooling system for enclosed cattle sheds according to claim 1, characterized in that: A ventilated roof ridge (25) is provided on the top of the enclosed cattle shed.

5. The precision ventilation and cooling system for enclosed cattle sheds according to any one of claims 1-4, characterized in that: The ventilation duct (1) includes a reduced-diameter inner tube (35) inserted inside the gourd segment (31). The reduced-diameter inner tube (35) is evenly arranged with 2-4 through holes (36). Each gourd segment (31) includes a large hollow sphere (32) and a small hollow sphere (33). The large hollow sphere (32) and the small hollow sphere (33) are connected together through a throat (34). Both the large hollow sphere (32) and the small hollow sphere (33) are provided with multiple There are air supply holes (22) facing different directions. Some of the air supply holes (22) are located in the lower half of the large hollow sphere (32) and the small hollow sphere (33). After the cold air from the indirect evaporative cooling system (2) enters the narrow-diameter inner tube (35), it is distributed to each large hollow sphere (32) and small hollow sphere (33) through the through hole (36), and then sent to the closed cattle shed through the air supply holes (22) on the large hollow sphere (32) and the small hollow sphere (33).

6. The precision ventilation and cooling system for enclosed cattle sheds according to any one of claims 1-4, characterized in that: The ventilation duct (1) includes several gourd-shaped segments (31), each gourd-shaped segment (31) includes a large hollow sphere (32) and a small hollow sphere (33). The large hollow sphere (32) and the small hollow sphere (33) are connected together through a throat (34). The large hollow sphere (32) and the small hollow sphere (33) are provided with multiple air supply holes (22) facing different directions. Some of the air supply holes (22) are located in the lower half of the large hollow sphere (32) and the small hollow sphere (33). The cold airflow from the indirect evaporative cooling system (2) enters each large hollow sphere (32) and the small hollow sphere (33) in sequence, and then is sent to the closed cattle shed through the air supply holes (22) on the large hollow sphere (32) and the small hollow sphere (33).

7. A control method using the precision ventilation and cooling system for a closed cattle shed as described in any one of claims 1-6, characterized in that the steps include... include: S1, using a temperature sensor module to obtain the temperature inside the sealed cattle shed and the temperature outside the sealed cattle shed in real time; S21, if the outside temperature is less than or equal to the set value, control the intelligent two-way ball valve (14) to open for ventilation mode. Then, when the inside temperature is just within the control temperature range, stabilize the opening of the intelligent two-way ball valve (14) to maintain this state. When the inside temperature is outside the control temperature range, adjust the ventilation temperature by adjusting the opening and closing degree of the intelligent two-way ball valve (14). S22, if the outside temperature is greater than the set value, control the spray mechanism of the indirect evaporative cooling system (2) to start the cooling mode; First, obtain the required and minimum ventilation volumes for the enclosed cattle shed; If the required ventilation volume is less than or equal to the minimum ventilation volume, the required ventilation volume is set to the minimum ventilation volume. Then, the intelligent two-way ball valve (14) is opened and ventilation mode is activated. Subsequently, when the temperature inside the building is just within the control temperature range, the opening degree of the intelligent two-way ball valve (14) is stabilized to maintain this state. When the temperature inside the building is outside the control temperature range, the ventilation temperature is adjusted by adjusting the opening and closing degree of the intelligent two-way ball valve (14). If the required ventilation volume is greater than the minimum ventilation volume, the preset ventilation volume is set to the required ventilation volume. Then, if the temperature inside the building is just within the control temperature range, this state is maintained; if the temperature inside the building is outside the control temperature range, the ventilation volume is adjusted by adjusting the speed of the fan (3).

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