Radiation heat-based pig farm environment control device

Abstract

This invention discloses a pig farm environmental control device based on radiative heat transfer, comprising a pigsty, an integrated air conditioning unit installed on the exterior of the pigsty, a wet film evaporator installed on the top of the integrated air conditioning unit, an air supply duct connected to the exhaust port of the wet film evaporator, the air supply duct suspended inside the pigsty, several radiative cooling panel systems installed inside the pigsty, and an exhaust duct installed under the floor of the pigsty, with an exhaust fan installed in the exhaust duct for drawing and exhausting air. This invention has advantages such as low energy consumption, high operating efficiency, low air exchange volume, good air quality, low odor emissions, and relatively low operating costs, achieving the goal of low energy consumption and efficient environmental control in pigsties.

Description

Technical Field

[0001] This invention relates to the field of environmental control technology for pig farms, specifically to a pig farm environmental control device based on radiative heat transfer. Background Technology

[0002] Currently, medium- to large-scale pig farming typically uses a evaporative cooling pad + fan ventilation system for temperature control. This system generally offers three modes: positive pressure ventilation, negative pressure ventilation, and a combination of both. All three modes utilize the evaporation of water from the evaporative cooling pads to lower the air temperature, which is then carried into the pigsty by fans. The evaporative cooling pads and fans are located at opposite ends of the pigsty. While this method offers advantages such as simple equipment, high cooling efficiency, and reliable installation and operation, it also presents challenges including high ventilation volume, significant air filtration and odor control requirements, high relative humidity, the existence of ventilation dead zones, and difficulties in biosecurity control.

[0003] To better reduce equipment operating costs, improve pigsty cooling efficiency and air quality, reduce the load on air purification and odor treatment, and improve the level of biosecurity control in pigsties, it is necessary to develop a new environmental control device for pig farms. Summary of the Invention

[0004] The purpose of this invention is to provide a pig farm environmental control device based on radiative heat transfer, which is a low-carbon and energy-saving environmental control system with low energy consumption, high operating efficiency, low air exchange volume, good air quality, low odor emissions, and relatively low operating costs. It has the advantages of low energy consumption in pig houses and efficient environmental control.

[0005] The present invention adopts the following technical solution.

[0006] A pig farm environmental control device based on radiative heat transfer includes a pigsty. An integrated air conditioning unit is installed on the outside of the pigsty. A wet film evaporator is installed on the top of the integrated air conditioning unit. An air supply pipe is connected to the exhaust port of the wet film evaporator and is suspended from the ceiling inside the pigsty. Several radiative temperature control panel systems are installed inside the pigsty, arranged symmetrically in two rows. A walkway is provided between the two rows of radiative temperature control panel systems. An exhaust duct is installed under the ground of the radiative temperature control panel systems inside the pigsty, and an exhaust fan for exhausting air is installed in the exhaust duct.

[0007] Furthermore, the integrated air conditioner is equipped with a refrigeration system, which uses a mechanical scroll compressor for refrigeration and is integrated into the integrated air conditioner.

[0008] Furthermore, the integrated air conditioning unit uses its internal refrigeration system to control humidity and adjust temperature within the pigsty.

[0009] Furthermore, the system also includes a ventilation system that employs an upward-supplying and downward-exhausting airflow pattern. The airflow path in and around the pig living area forms a zigzag structure (the outlet area of ​​the supply duct is defined as the first transverse airflow segment, the pig living area and the designated vertical area are defined as the vertical segment, and the exhaust area is defined as the second transverse airflow segment). The temperature-controlled airflow generated by the radiant cooling plate converges from the circumference of the pig living area towards its inner side. This approach, as one of the core technological innovations of this invention, not only achieves a temperature control effect similar to a Laval flow field but also enables faster, more efficient, and smoother temperature control and ventilation, fundamentally different from the near-unidirectional, smooth airflow path of traditional ventilation and temperature control systems.

[0010] Furthermore, the air supply duct is U-shaped and made of PP hollow board. One end of the air supply duct has an air inlet, and both sides of the air supply duct have exhaust holes.

[0011] Furthermore, it also includes a heat recovery system and a deodorization system.

[0012] Furthermore, the radiant temperature control panel system includes a cooling panel, cooling water, chilled water, pump valves and pipelines, and a control system.

[0013] Furthermore, a bracket for installation and positioning is provided between each pair of adjacent refrigeration panels. The refrigeration panel is a blackbody radiation temperature control plate, and an outer frame is installed around the outside of the blackbody radiation temperature control plate, which surrounds the pig living area.

[0014] Furthermore, a base is provided on the bottom side of the bracket, and a threaded rod is screwed into the inside of the bracket. The bottom end of the threaded rod is rotatably connected to the top of the base, and a swivel is fixedly installed on the top of the threaded rod. Threaded cylinders are fixedly installed around both the upper and lower ends of the bracket, and a screw-connecting assembly for connection and positioning is provided between the blackbody radiation temperature control plate and the threaded cylinder.

[0015] Furthermore, the screw-on assembly includes a disc shell fixedly installed on the side wall of the blackbody radiation temperature control plate. A knob is rotatably connected to the side of the disc shell away from the blackbody radiation temperature control plate. A bolt is fixedly installed on the side of the knob away from the knob, and the bolt is screwed into the inside of a threaded cylinder. A turntable is fixedly installed on the side of the knob close to the disc shell, and the turntable is rotatably connected inside the disc shell. Annular grooves are formed on both sides of the turntable. Ball bearings are embedded in the corresponding annular grooves inside the disc shell, and the ball bearings are rotatably connected within the annular grooves.

[0016] Beneficial effects: This invention not only achieves a temperature control effect similar to Laval flow field in the pig living area, but also achieves temperature control and ventilation more efficiently and smoothly, fundamentally different from the airflow path of traditional ventilation and temperature control systems, which is close to unidirectional ventilation and smooth temperature control. This invention has advantages such as low energy consumption, high operating efficiency, small air exchange volume, good air quality, low odor emission, and low operating cost, achieving the goal of low energy consumption and efficient environmental control in pig houses. In use, turning the knob will drive the bolt into the threaded cylinder, and at the same time drive the turntable to rotate in the disc shell, thereby installing and fixing the blackbody radiation cooling plate, facilitating the assembly of the cooling pen, and adjusting the pen area according to the number of pigs. Turning the rotating ring will drive the threaded rod to rotate inside the bracket, which will facilitate the adjustment of the bracket height, making it easy to adjust the height of the outer frame according to actual needs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment; Figure 2 This is a schematic cross-sectional view of the pigsty as an example. Figure 3 This is a schematic diagram of the air supply duct structure for an example. Figure 4 This is a schematic diagram of the radiant cooling balustrade system structure for an example. Figure 5 This is a schematic diagram of the installation of the refrigeration panel structure in an embodiment. Figure 6 This is a schematic diagram of the screw-on structure in an embodiment; Figure 7 This is a cross-sectional schematic diagram of the screw-on structure in an embodiment. In the diagram: 1. Pigsty; 2. Integrated air conditioning unit; 3. Wet film evaporator; 4. Air supply duct; 5. Radiant cooling fence system; 6. Exhaust duct; 7. Exhaust fan; 41. Air inlet; 42. Exhaust hole; 51. Bracket; 52. Blackbody radiant cooling plate; 53. Outer frame; 54. Base; 55. Threaded rod; 56. Rotary ring; 57. Threaded cylinder; 58. Screw-on assembly; 581. Disc shell; 582. Knob; 583. Bolt; 584. Turntable; 585. Ring groove; 586. Ball bearing. Detailed Implementation

[0018] 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

[0019] Please see Figure 1-2A pig farm environmental control device based on radiative heat transfer includes a pig house 1. An integrated air conditioning unit 2 is installed on the outside of the pig house 1. The integrated air conditioning unit 2 is equipped with a refrigeration system. The refrigeration system uses a mechanical energy scroll compressor for refrigeration and is integrated into the integrated air conditioning unit 2. It has two core capabilities: cold water treatment and air treatment. The internal layout is compact and efficient, with a small footprint and an energy efficiency ratio (EER) > 4.5. A wet film evaporator 3 is installed on the top of the integrated air conditioning unit 2. An air supply pipe 4 is connected to the exhaust port of the wet film evaporator 3. The air supply pipe 4 is suspended from the top of the inner cavity of the pig house 1. Several radiative cooling baffle systems 5 are installed inside the pig house 1, arranged symmetrically in two rows. A walkway is provided between the two rows of radiative cooling baffle systems 5. An exhaust duct 6 (actually an exhaust channel under the manure slats) is set under the ground of the radiative cooling baffle system 5 in the pig house 1. An exhaust fan 7 for exhaust ventilation is installed in the exhaust duct 6.

[0020] In this embodiment, the integrated air conditioning unit 2, through its internal refrigeration system, controls the humidity and temperature of the pigsty 1. Humidity control: To ensure indoor humidity remains below 80%, especially under high-temperature and high-humidity conditions, methods such as rotary dehumidification, compression dehumidification, chemical dehumidification, and membrane dehumidification all suffer from large equipment size and difficult maintenance. Therefore, this system uses cooling dehumidification, where hot and humid fresh air is first cooled to below the dew point by the fresh air conditioning system before being delivered indoors. Temperature control: Automatic adjustment is possible based on heat load requirements.

[0021] In this embodiment, three scroll compressors are used to pre-treat the fresh air in stages to ensure that the supply air temperature is between 18-28°C. Through air convection, a comfortable breathing temperature and indoor thermal balance are quickly achieved.

[0022] In this embodiment, the radiant heat exchange system mainly consists of a compressor, a cooling pump, a refrigeration pump, pipelines, and a radiant cooling plate. Essentially, it supplies circulating liquid into the inner cavity of the blackbody radiant cooling plate 52, and controls the temperature of the radiated airflow by controlling the temperature of this liquid, thereby achieving temperature control of the pigs' living area. This solution can control about 50% of the heat, significantly reducing operational energy consumption and is more effective than traditional negative pressure water curtains.

[0023] Actual measurements show that when the outdoor temperature is 41℃, the indoor air supply temperature can be adjusted within the range of 18-30℃, the chilled water temperature can be adjusted within the range of 16-25℃, and the cooling water temperature difference and superheat all meet the temperature control design requirements; the indoor humidity can be adjusted according to indoor needs, and the humidification or dehumidification is automatically controlled by the electronic control system.

[0024] In this embodiment, please refer to Figure 1-3The system also includes a ventilation system, which adopts an upward supply and downward exhaust airflow organization. The supply air duct 4 is connected to the exhaust fan. The supply air duct 4 is U-shaped and made of PP hollow board, which is inexpensive, has minimal deformation, and is clean and hygienic. The airflow path in and around the pig living area has a Z-shaped structure (the outlet area of ​​the supply air duct 4 is defined as the first horizontal airflow section, the pig living area and the set height area above and below it are defined as the vertical section, and the exhaust area is defined as the second horizontal airflow section). The temperature-controlled airflow generated by the blackbody radiation cooling plate 52 moves from the circumference of the pig living area inwards and tends to compress the airflow delivered by the supply air duct 4. This solution, as one of the core technical points of this invention, not only achieves a temperature control effect similar to Laval flow field, but also achieves temperature control and ventilation more efficiently and smoothly, which is fundamentally different from the airflow path of traditional ventilation and temperature control systems, which is close to unidirectional ventilation and smooth temperature control.

[0025] One end of the air supply pipe 4 has an air inlet 41, and exhaust holes 42 are opened through both sides of the air supply pipe 4. Air is supplied to the pigsty through the air supply pipe 4. With the cooperation of the exhaust fan 7, the air will be blown towards the pigs in a parabolic shape along the exhaust holes 42 opened on the outside of the air supply pipe 4, and discharged through the exhaust duct 6, forming a circulation path similar to a "Z" shape, which significantly improves the air circulation rate in the pig farm.

[0026] Under the same effective pigsty area, and under extreme conditions of outdoor temperature of 42℃ and indoor temperature and humidity below 27℃ and 80%, the total power consumption of the pigsty in this example at full load is only 48kw / h. This power consumption is only generated during the few hours of the relatively hottest period. Moreover, the controlled indoor temperature is 4-5℃ lower than that of the negative pressure water curtain method, and the controlled humidity is more than 20% lower than that of the negative pressure water curtain method. Furthermore, the temperature distribution inside the pigsty is uniform, while the temperature difference between the air inlet and outlet of the traditional water curtain fan is large, and the greater the length, the greater the temperature difference.

[0027] According to on-site measurements, the indoor airflow meets the requirement of <0.6m / s at the pig's back, meets the requirement of uniformity of planar air distribution within 15%, and meets the design requirement of 12000-17000m³ / h; the indoor positive and negative pressure is adjustable.

[0028] Please see Figure 4-5The radiant cooling pen system 5 mainly consists of cooling pens, cooling water, chilled water, pumps, valves, pipelines, and a control system. A bracket 51 for installation and positioning is installed between each pair of adjacent cooling pens. The cooling pens are blackbody radiant cooling panels 52, surrounded by an outer frame 53. The blackbody radiant cooling panels 52 enclose the pigs. The piglets' surface temperature of approximately 39°C exchanges heat with the low-temperature radiant cooling pens through electromagnetic infrared radiation, resulting in a 1-2°C lower temperature in the pig's respiratory zone compared to the upper space. This effectively saves energy, avoids cold and heat stress caused by traditional underfloor heating systems, and can replace individual pens, reducing construction costs. Actual measurements show that with 76 cooling panels, the temperature difference between each panel is within the range of 1-3°C under no-load conditions, meeting energy-saving requirements.

[0029] Please see Figure 4-5 A base 54 is provided on the bottom side of the bracket 51. A threaded rod 55 is screwed into the inside of the bracket 51. The bottom end of the threaded rod 55 is rotatably connected to the top of the base 54. A swivel ring 56 is fixedly installed on the top of the threaded rod 55. Threaded cylinders 57 are fixedly installed on all four sides of the upper and lower ends of the bracket 51. A screw-connecting assembly 58 for connection and positioning is provided between the blackbody radiation cooling plate 52 and the threaded cylinders 57. The screw-connecting assembly 58 facilitates the installation of the blackbody radiation cooling plate 52. By turning the swivel ring 56, the threaded rod 55 is rotated inside the bracket 51, thereby adjusting the height of the bracket 51 and facilitating the adjustment of the height of the outer frame 53.

[0030] Please see Figure 6-7 The screw-on assembly 58 includes a disc shell 581 fixedly mounted on the side wall of the blackbody radiative cooling plate 52. A knob 582 is rotatably connected to the side of the disc shell 581 away from the blackbody radiative cooling plate 52. A bolt 583 is fixedly mounted on the side of the knob 582 away from the knob 582, and the bolt 583 is screwed into the inside of the threaded cylinder 57. A turntable 584 is fixedly mounted on the side of the knob 582 near the disc shell 581, and the turntable 584 is rotatably connected to the inside of the disc shell 581. Both sides of 84 are provided with annular grooves 585. Inside the disc shell 581, corresponding to the annular grooves 585, there are ball bearings 586. The ball bearings 586 are rolled and connected in the annular grooves 585. By turning the knob 582, the bolt 583 will be screwed into the threaded cylinder 57. At the same time, the turntable 584 will be rotated in the disc shell 581, which will install and fix the blackbody radiation cooling plate 52. This makes it easy to assemble the cooling pen and adjust the pen area according to the number of pigs.

[0031] The implementation process also includes a heat recovery system and a deodorization system. The heat recovery system consists of an air-water stainless steel heat exchanger, cooling water pipelines, pumps and valves, and a condensate recovery system. Its purpose is to recover the cooling energy of the low-temperature air discharged from the enclosure and the cooling water system, while simultaneously recovering the low-temperature condensate through the pipeline system. Its advantages lie in its stable cooling temperature, low water evaporation, minimal impact on usable space, and cost only half that of a cooling tower or deodorization tower, when combined with the deodorization system. Actual measurements show that under continuous full-load operation at an outdoor temperature of 41℃, the total water consumption for deodorization and cooling water evaporation does not exceed 4 tons. The temperature difference of the cooling water in the heat recovery system does not exceed 10℃. Meeting energy-saving requirements, the deodorization system uses water spraying to wash and deodorize odorous substances such as ammonia. It consists of stainless steel spray trays, a sedimentation tank, a water pump, water supply pipes, and a water distributor. The design fully considers air quality and odor emissions. Odor treatment costs and impacts are minimized only by reducing exhaust volume. Therefore, the total exhaust volume of the entire pen is approximately 15,000 m³ / h, significantly lower than the 120,000 m³ / h treatment capacity of traditional negative pressure systems. Consequently, in actual operation, the suitable indoor temperature and humidity eliminate the need for pigs to drink large amounts of water to dissipate body heat, thus saving water consumption for piglets in summer and correspondingly reducing construction costs.

Claims

1. A pig farm environmental control device based on radiative heat transfer, comprising a pigsty (1), characterized in that: An air conditioning unit (2) is installed on the outside of the pig house (1). A wet film evaporator (3) is installed on the top of the air conditioning unit (2). An air supply pipe (4) is connected to the exhaust port of the wet film evaporator (3). The air supply pipe (4) is suspended from the top of the pig house (1). Several radiant temperature control panel systems (5) are installed inside the pig house (1) and are arranged symmetrically in two rows. A walkway is provided between the two rows of radiant temperature control panel systems (5). An exhaust duct (6) is installed under the ground of the radiant temperature control panel system (5) inside the pig house (1). An exhaust fan (7) for exhaust ventilation is installed in the exhaust duct (6). A ventilation system is also included, which adopts an upward supply and downward exhaust method. The airflow path is Z-shaped in the pig living area and its vicinity; the air supply pipe (4) is U-shaped and made of PP hollow board. One end of the air supply pipe (4) has an air inlet (41), and exhaust holes (42) are opened through both sides of the air supply pipe (4); the radiant temperature control plate system (5) includes a cooling plate, cooling water, chilled water, pump valve pipeline, and control system; a bracket (51) for installation and positioning is provided between each two adjacent cooling plates. The cooling plate is a blackbody radiant temperature control plate (52), and an outer frame (53) is installed around the outside of the blackbody radiant temperature control plate (52). The blackbody radiant temperature control plate (52) surrounds the pig living area.

2. The pig farm environmental control device based on radiative heat transfer according to claim 1, characterized in that: The air conditioning unit (2) is equipped with a refrigeration system, which uses a mechanical energy scroll compressor for refrigeration and is integrated into the air conditioning unit (2).

3. The pig farm environmental control device based on radiative heat transfer according to claim 1, characterized in that: The air conditioning unit (2) is used to control humidity and adjust temperature in the pig house (1) through the internal refrigeration system.

4. The pig farm environmental control device based on radiative heat transfer according to any one of claims 1-3, characterized in that: It also includes a heat recovery system and a deodorization system.

5. The pig farm environmental control device based on radiative heat transfer according to claim 4, characterized in that: The bracket (51) has a base (54) on its bottom side. A threaded rod (55) is screwed into the inside of the bracket (51). The bottom end of the threaded rod (55) is rotatably connected to the top of the base (54). A swivel ring (56) is fixedly installed on the top of the threaded rod (55). Threaded cylinders (57) are fixedly installed around both the upper and lower ends of the bracket (51). A screw-connecting assembly (58) for connection and positioning is provided between the blackbody radiation temperature control plate (52) and the threaded cylinder (57).

6. The pig farm environmental control device based on radiative heat transfer according to claim 5, wherein the screw-connect assembly (58) includes a disc shell (581) fixedly installed on the side wall of the blackbody radiative temperature control plate (52), a knob (582) is rotatably connected to the side of the disc shell (581) away from the blackbody radiative temperature control plate (52), and a bolt (583) is fixedly installed on the side of the knob (582) away from the knob (582), and the bolt (583) is screwed onto the... Inside the threaded cylinder (57), a turntable (584) is fixedly installed on the side of the knob (582) near the disc shell (581), and the turntable (584) is rotatably connected inside the disc shell (581). Annular grooves (585) are provided on both sides of the turntable (584), and a ball (586) is embedded in the disc shell (581) corresponding to the annular groove (585), and the ball (586) is rotatably connected in the annular groove (585).

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