CN110800522B - Greenhouse environment adjusting system based on positive pressure ventilation - Google Patents

Greenhouse environment adjusting system based on positive pressure ventilation Download PDF

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Publication number
CN110800522B
CN110800522B CN201911001049.8A CN201911001049A CN110800522B CN 110800522 B CN110800522 B CN 110800522B CN 201911001049 A CN201911001049 A CN 201911001049A CN 110800522 B CN110800522 B CN 110800522B
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China
Prior art keywords
air
greenhouse
section
conditioning unit
generator
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CN110800522A (en
Inventor
孙维拓
郭文忠
徐凡
周波
赵倩
陈红
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Beijing Research Center of Intelligent Equipment for Agriculture
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Beijing Research Center of Intelligent Equipment for Agriculture
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Publication of CN110800522A publication Critical patent/CN110800522A/en
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
    • A01G9/24—Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
    • A01G9/246—Air-conditioning systems
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
    • A01G9/18—Greenhouses for treating plants with carbon dioxide or the like
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
    • A01G9/24—Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
    • A01G9/241—Arrangement of opening or closing systems for windows and ventilation panels
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
    • A01G9/24—Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
    • A01G9/245—Conduits for heating by means of liquids, e.g. used as frame members or for soil heating
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/015—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2209/00—Aspects relating to disinfection, sterilisation or deodorisation of air
    • A61L2209/10—Apparatus features
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/25—Greenhouse technology, e.g. cooling systems therefor

Abstract

The invention relates toAnd the field of facility environment regulation and control, and discloses a greenhouse environment regulating system based on positive pressure ventilation, which comprises an air conditioning unit, an air supply pipe and CO2A generator and an ozone generator. The blast pipe is arranged in the greenhouse, and the air intake and the air conditioning unit of blast pipe are connected, and the blast pipe is equipped with a plurality of air outlets, and the air conditioning unit is used for filtering, heating or cooling, humidification or dehumidification regulation to the air that will accord with greenhouse ambient temperature and humidity requirement through the blast pipe send everywhere in the greenhouse that is in the malleation state. CO22The generator is used for increasing the CO in the temperature chamber2Concentration; the ozone generator is used for generating ozone for disinfecting the greenhouse. The greenhouse environment adjusting system based on positive pressure ventilation provided by the embodiment of the invention realizes comprehensive adjustment and control of the greenhouse environment under the positive pressure greenhouse environment, can uniformly convey wet and cold air to a greenhouse space through the blast pipe, and has the advantages of quick air replacement and low construction cost.

Description

Greenhouse environment adjusting system based on positive pressure ventilation
Technical Field
The invention relates to the field of facility environment regulation, in particular to a greenhouse environment regulation system based on positive pressure ventilation.
Background
Annual high-efficiency, high-quality, clean and safe production of greenhouses is the development direction of facility gardening industry, but inappropriate environmental conditions in greenhouses become the limiting factors of the development. In order to guarantee suitable crop production environmental conditions and improve the greenhouse environment control efficiency and the greenhouse production economic benefit, the greenhouse environment needs to be comprehensively regulated and controlled, rather than simply regulating and controlling a certain environmental factor. Comprehensive regulation and control of greenhouse environment involving heating, cooling, humidifying, dehumidifying, CO2Supplementary application, air filtration, disinfection and the like, and the implementation process is closely related to greenhouse ventilation and air flow organization.
At present, the mechanical ventilation of greenhouses is usually coupled with a wet curtain, i.e. using a wet curtain fan to dropThe temperature system carries out greenhouse ventilation and temperature reduction. An axial flow fan and a wet curtain of a traditional wet curtain fan cooling system are separated and are respectively installed on a greenhouse wall, and the airflow organization form of the system is negative pressure ventilation. The adoption of a negative pressure wet curtain fan for cooling has a plurality of defects: the temperature distribution is not uniform in the airflow direction, and the temperature gradually rises from the wet curtain to the fan; considering the wind speed and the wind volume, the effective installation distance between the fan and the wet curtain is about 40m, and the length of the single-span greenhouse is limited; strict requirements on the tightness of the greenhouse are met; cooling, heating, humidifying, dehumidifying, CO of greenhouse under negative pressure ventilation condition2Environmental regulation and control measures such as supplementary application, air filtration, disinfection and the like can only be in war of each other, are not convenient for centralized control and control, and are repeatedly invested.
Disclosure of Invention
The embodiment of the invention provides a greenhouse environment adjusting system based on positive pressure ventilation, which is used for solving the problems that the temperature distribution in the airflow direction is not uniform, the temperature in a greenhouse is reduced, the temperature is increased, the humidity is removed, CO2 is supplemented, and the air filtration, the disinfection and other environmental regulation measures are difficult to be managed in a centralized manner in the conventional negative pressure ventilation mode.
The embodiment of the invention provides a greenhouse environment adjusting system based on positive pressure ventilation, which comprises an air conditioning unit, an air supply pipe and CO2Generators and ozone generators;
the air supply pipe is arranged in the greenhouse, an air inlet of the air supply pipe is connected with the air conditioning unit, and the air supply pipe is provided with a plurality of air outlets;
the CO is2The generator is used for increasing CO in the greenhouse2Concentration;
the ozone generator is used for generating ozone for disinfecting the greenhouse.
The greenhouse environment adjusting system based on positive pressure ventilation provided by the embodiment of the invention realizes heating, cooling, humidifying, dehumidifying and CO generation in a positive pressure greenhouse environment2Comprehensive regulation and control of greenhouse environment including application, air filtration, disinfection, etc. The requirement on the tightness of the greenhouse is low, the wet and cold air can be uniformly conveyed to the greenhouse space through the blast pipe, the directional and accurate conveying is realized, and the air replacement is fast; can be used for heating, dehumidifying and CO2Supplementary application, air filtration and disinfection are organically integrated with the isothermal chamber environment regulation and control equipment, so that the greenhouse construction cost is reduced. Meanwhile, positive pressure ventilation is adopted to carry out centralized filtration and disinfection treatment on air entering the greenhouse, the air is in a positive pressure state indoors, foreign insect sources, germs, dust and the like can be effectively prevented from entering the greenhouse, the disease and pest incidence rate and the pesticide use amount are reduced, the green prevention and control technology is adopted, and clean production of the greenhouse is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a positive pressure ventilation-based greenhouse environment conditioning system provided by an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a positive pressure ventilation-based greenhouse environment conditioning system according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a positive pressure ventilation-based greenhouse environment conditioning system according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of an air conditioning unit according to an embodiment of the present invention;
in the figure: 1. a device room; 2. an air conditioning unit; 3. CO22A generator; 4. an ozone generator; 5. an outer ventilation window; 6. an inner ventilation window; 7. a centralized control device; 8. an air supply pipe; 9. an air outlet; 10. an air valve; 11. a return air duct; 12. a stop valve; 13. an air return inlet; 14. a hot water supply pipe; 15. a water replenishing pipe; 16. a first switching valve; 17. a second switching valve; 18. an air guide pipeline; 21. an air inlet section; 22. a filtration section; 23. a heating section; 24. a humidifying and cooling section; 25. a fan section; 26. an air outlet section; 81. a main air supply pipe; 82. and an air supply branch pipe.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.
In addition, in the description of the present invention, "a plurality", and "a plurality" mean two or more unless otherwise specified.
As shown in figures 1-3, the embodiment of the invention provides a greenhouse environment adjusting system based on positive pressure ventilation, which comprises an air conditioning unit 2, a blast pipe 8, and CO2A generator 3 and an ozone generator 4. 8 blast pipes arrange in the greenhouse, and 8 air intakes of blast pipes are connected with air conditioning unit 2, and 8 blast pipes are equipped with a plurality of air outlets 9, and air conditioning unit 2 is used for filtering, heating or cooling, humidification or dehumidification regulation to air that will accord with greenhouse ambient temperature and humidity requirement is sent to being in through 8 blast pipes and is just being inAll parts in the greenhouse in a pressed state. CO22The generator 3 is used for increasing the CO in the temperature chamber2Concentration; the ozone generator 4 is used for generating ozone for disinfecting the greenhouse.
In order to guarantee suitable crop production environmental conditions and improve the greenhouse environment control efficiency and the greenhouse production economic benefit, the greenhouse environment needs to be comprehensively regulated and controlled, rather than simply regulating and controlling a certain environmental factor. Comprehensive regulation and control of greenhouse environment involving heating, cooling, humidifying, dehumidifying, CO2Supplementary application, air filtration, disinfection and the like, and the implementation process is closely related to greenhouse ventilation and air flow organization. At present, the mechanical ventilation of the greenhouse is usually coupled with a wet curtain, namely, a wet curtain fan cooling system is adopted for carrying out greenhouse ventilation cooling. An axial flow fan and a wet curtain of a traditional wet curtain fan cooling system are separated and are respectively installed on a greenhouse wall, and the airflow organization form is negative pressure ventilation. The adoption of a negative pressure wet curtain fan for cooling has a plurality of defects: the temperature distribution is not uniform in the airflow direction, and the temperature gradually rises from the wet curtain to the fan; considering the wind speed and the wind volume, the effective installation distance between the fan and the wet curtain is about 40m, and the length of the single-span greenhouse is limited; strict requirements on the tightness of the greenhouse are met; cooling, heating, humidifying, dehumidifying, CO of greenhouse under negative pressure ventilation condition2Environmental regulation and control measures such as supplementary application, air filtration, disinfection and the like can only be in war of each other, are not convenient for centralized control and control, and are repeatedly invested.
The greenhouse environment adjusting system based on positive pressure ventilation provided by the embodiment of the invention realizes heating, cooling, humidifying, dehumidifying and CO generation in a positive pressure greenhouse environment2Comprehensive regulation and control of greenhouse environment including application, air filtration, disinfection, etc. The requirement on the tightness of the greenhouse is low, the wet and cold air can be uniformly conveyed to the greenhouse space through the blast pipe 8, the directional and accurate conveying is realized, and the air replacement is fast; can be used for heating, dehumidifying and CO2Supplementary application, air filtration and disinfection are organically integrated with the isothermal chamber environment regulation and control equipment, so that the greenhouse construction cost is reduced. Meanwhile, positive pressure ventilation is adopted to carry out centralized filtration and disinfection treatment on air entering the greenhouse, and the indoor environment is in a positive pressure state, so that foreign insect sources, germs, dust and the like can be effectively prevented from entering the indoor environment, the disease and insect pest incidence rate is reduced, andthe pesticide dosage belongs to the green prevention and control technology, and is beneficial to realizing clean production in greenhouses.
As shown in FIG. 4, in the greenhouse environment conditioning system based on positive pressure ventilation provided by the embodiment of the invention, the air conditioning unit 2 may comprise an air inlet section 21 and a filtering section 22 which are connected, and CO2The generator 3 and the ozone generator 4 are both connected to a filter section 22 via a gas line 18, so that the CO is present2High CO output from generator 32The air with high content of ozone output by the ozone generator 4 and the air with high content of ozone are filtered by the filter section 22 and are conveyed to all places in the greenhouse through the blast pipe 8, so that uniform CO in the greenhouse is realized2Application and ozone disinfection.
The greenhouse environment adjusting system based on positive pressure ventilation provided by the embodiment of the invention can also comprise an equipment room 1. The equipment room 1 can be arranged in the greenhouse or at the position of the greenhouse outside and adjacent to the greenhouse, the air conditioning unit 2 and CO2The generator 3 and the ozone generator 4 are both arranged in the equipment room 1; the internal space of the equipment room 1 is closed, and the equipment room 1 is provided with an external ventilating window 5 communicated with the external space and an internal ventilating window 6 communicated with the greenhouse. Air conditioning unit 2 and CO are realized through equipment room 12Centralized arrangement of each device of the isothermal chamber environment regulating system of the generator 3 and the ozone generator 4, an air conditioning unit 2 and CO2The generator 3 and the ozone generator 4 suck air from the equipment room 1, and adjust and control the air source in the equipment room 1 through opening and closing of an outer ventilating window 5 and an inner ventilating window 6 of the equipment room 1, so that the operation mode of the system and the regulation and control of the air flow organization are realized.
The greenhouse environment adjusting system based on positive pressure ventilation provided by the embodiment of the invention can be used for medium and small greenhouses such as sunlight greenhouses without arranging the equipment room 1, and the air conditioning unit 2 is directly arranged in the greenhouse. At this time, the air intake section 21 of the air conditioning unit 2 may include a first air intake section and a second air intake section which are arranged in parallel, the first air intake section is communicated with the external space, and the second air intake section is communicated with the greenhouse; the inlet of the first air inlet section is provided with a first switching valve 16, and the inlet of the second air inlet section is provided with a second switching valve 17. At this time, the air source of the air conditioning unit 2 can be adjusted by opening and closing the first switching valve 16 and the second switching valve 17, so that the system operation mode and the air flow organization can be regulated and controlled.
According to the greenhouse environment adjusting system based on positive pressure ventilation provided by the embodiment of the invention, the air conditioning unit 2 can further comprise a heating section 23, a humidifying and cooling section 24, a fan section 25 and an air outlet section 26 which are sequentially arranged. The heating section 23 is connected with the filtering section 22, and the air outlet section 26 is connected with an air inlet of the blast pipe 8. The air inlet section 21 of the air conditioning unit 2 can be provided with a dustproof and insect-proof net to primarily purify the inflow air. A primary filter screen is arranged at the filter section 22 of the air conditioning unit 2 to further purify the inflow air; the primary filter screen can be a bag filter. A heat exchange coil can be arranged at the heating section 23 of the air conditioning unit 2 and is connected with a heating heat source of the greenhouse through a hot water supply pipe 14; the heat exchange coil can also be a finned heat exchanger, and the heating heat source of the greenhouse can be various modes such as municipal heating, biomass, natural gas, solar energy, heat pump and the like. A wet curtain, a water tank and a circulating water pump can be arranged at the humidifying and cooling section 24 of the air conditioning unit 2, and the water tank is connected with a water supplementing water source of the greenhouse through a water supplementing pipe 15. The fan section 25 may be provided with a centrifugal fan, such as a variable frequency centrifugal fan.
The greenhouse environment adjusting system based on positive pressure ventilation provided by the embodiment of the invention can also comprise a return air pipe 11. The return air duct 11 includes a return air outlet and a plurality of return air inlets 13, the return air outlet is located in the equipment room 1, and the plurality of return air inlets 13 are located in the greenhouse. Through locating a plurality of return air inlets 13 everywhere in the greenhouse, inhale equipment room 1 with the air in the greenhouse more evenly, can further accelerate air replacement speed, promote the quality of taking a breath. Particularly for large and medium-sized greenhouses, the return air pipe 11 or the return fan can be additionally arranged to ensure smooth internal circulation of greenhouse air; the return air pipe 11 is communicated with the equipment room 1 and the greenhouse, a stop valve 12 can be arranged at one end, extending into the equipment room 1, of the return air pipe 11, so that the air of the greenhouse is prevented from circulating outwards, and the air supply direction of the circulating fan points to the equipment room 1 or the air conditioning unit 2.
In addition, the air supply duct 8 may include an air supply main duct 81 and an air supply branch duct 82. The pipe diameter of the main air supply pipe 81 along the air supply direction can be gradually reduced, so that the tail end of the air supply with smaller flow has a smaller pipe diameter; the main air supply pipe 81 can be a brick air duct or an iron sheet spiral air duct, and is buried underground and provided with a sewage pump. The air supply branch pipe 82 can also be buried underground, extends upwards to be exposed out of the ground and is connected with the air outlet 9, and can be a spiral air pipe or a PVC pipe; the air supply branch pipes 82 can also be arranged between the crop rows above the ground and hung below the cultivation frame, for example, a cloth bag or a film air pipe is selected, and holes are uniformly formed as the air outlets 9. An air valve 10 can be arranged at an air outlet 9 of the air supply pipe 8 and used for controlling the opening degree of the air outlet 9 and controlling the ventilation air flow in the greenhouse more accurately.
The greenhouse environment adjusting system based on positive pressure ventilation provided by the embodiment of the invention can also comprise a centralized control device 7 for integrally and centrally controlling the air conditioning unit 2 and CO2Various valves and sensors of the generator 3, the ozone generator 4 and other equipment and systems. The centralized control device 7 can be arranged at a place which is convenient to operate in the greenhouse or the equipment room 1, and the data which needs to be collected by the sensors comprises the temperature, the humidity and the CO of the air in the greenhouse2Concentration and ozone concentration; time cooperative control can be adopted, and the priority order of the control is temperature, humidity and CO in turn2Concentration control, ozone disinfection is typically performed during a fixed period of time at night.
The greenhouse environment adjusting system based on positive pressure ventilation provided by the embodiment of the invention has the following operation modes and corresponding airflow organizations:
1) when the temperature needs to be reduced in a high-temperature season, the outer ventilating window 5 is opened, the inner ventilating window 6 is closed, and the centrifugal fan of the fan section 25 of the air conditioning unit 2 and the circulating water pump of the humidifying and temperature reducing section 24 are started. The dry hot air entering the equipment room 1 through the external ventilation window 5 enters the air conditioning unit 2, is changed into wet cold air through humidification and temperature reduction and is sent into the greenhouse through the blast pipe 8, the hot air in the greenhouse is discharged through the top opening window, greenhouse air external circulation is formed, and greenhouse temperature reduction, humidification and filtration are completed.
2) When the heating is needed in cold seasons, the inner ventilation window 6 is opened, the outer ventilation window 5 is closed, the centrifugal fan of the fan section 25 of the air conditioning unit 2 is started, and meanwhile, the heating heat source of the greenhouse supplies circulating hot water for the heating section 23 heat exchange coil. The air in the equipment room 1 is heated by the air conditioning unit 2 and is sent into the greenhouse by the blast pipe 8, and then the air in the greenhouse returns to the equipment room 1 through the internal ventilation window 6 or the return air pipe 11 to form the internal circulation of the greenhouse air, thus completing the heating, dehumidification and filtration of the greenhouse.
3) Greenhouse needs to be supplemented with CO2Or when ozone disinfection is carried out, the inner ventilating window 6 is opened, the outer ventilating window 5 is closed, the centrifugal fan of the fan section 25 of the air conditioning unit 2 is started, and CO is operated simultaneously2A generator 3 or an ozone generator 4. CO22Or ozone is diffused into the greenhouse along with the internal circulation of the greenhouse air to finish greenhouse CO2Supplementary application or ozone disinfection.
4) The greenhouse needs to be dehumidified quickly or the outdoor air is used for supplementing indoor CO2When the air conditioner is started, the outer ventilating window 5 is opened, the inner ventilating window 6 is closed, and the centrifugal fan of the fan section 25 of the air conditioning unit 2 is started. Rapid dehumidification or CO in greenhouse by introducing fresh air through greenhouse air external circulation2And (5) supplementary application.
If the equipment room 1 is not arranged, the air conditioning unit 2 is directly placed in the greenhouse, the air inlet section 21 of the air conditioning unit 2 can comprise a first air inlet section and a second air inlet section which are arranged in parallel, the first air inlet section is communicated with the external space, and the second air inlet section is communicated with the greenhouse; the inlet of the first air inlet section is provided with a first switching valve 16, the inlet of the second air inlet section is provided with a second switching valve 17, and the inner circulation and outer circulation airflow organization modes of the greenhouse air are switched through the opening and closing of the first switching valve 16 and the second switching valve 17.
As shown in fig. 1, the embodiment of the present invention provides a specific positive pressure ventilation-based greenhouse environment conditioning system, which is as follows:
in the embodiment, the area of one area in northwest China is about 4300m2The novel multi-span glass greenhouse is carried out in a south-north direction, the south-north direction is 80m long, the east-west direction is 54m long, the span is 16m, the total span is 4, the span is 2m, the ridge height is 6.5m, the shoulder height is 3m, the ground is 1m in a sinking mode, and the external heat preservation is matched.
In order to realize comprehensive regulation and control of the environment of the greenhouse, in the embodiment, the system comprises an equipment room 1, an air conditioning unit 2 and CO2The device comprises a generator 3, an ozone generator 4, a centralized control device 7, an air supply pipe 8, an air outlet 9, an air valve 10, a return air pipe 11, a stop valve 12 and a return air inlet 13.
The equipment room 1 is 18m long and 6m wide, is arranged on the north side of the greenhouse, is adjacent to the greenhouse and is specially used for placing equipment devices related to environment regulation. The equipment room 1 is of a brick-concrete structure, and the internal space is closed. The equipment room 1 is provided with an outer ventilating window 5 and an inner ventilating window 6, the outer ventilating window 5 is communicated with the outdoor environment, and the inner ventilating window 6 is communicated with the greenhouse. The outer ventilation window 5 is provided with a dustproof insect-proof net which is used as a system for first filtering protection of air external circulation, and dust, sundries and pests are prevented from entering the equipment room 1 and then entering the greenhouse.
The air conditioning unit 2 is provided with 4 air conditioning units, is arranged in the equipment room 1 and comprises an air inlet section 21, a filtering section 22, a heating section 23, a humidifying and cooling section 24, a fan section 25 and an air outlet section 26, and the functional sections are sequentially connected. The air inlet section 21 is provided with a dustproof insect-proof net which is used as a second filtering protection of the system for air external circulation. The filter section 22 is provided with bag-type primary filtration for further filtering dust, worm eggs and the like. The heating section 23 is provided with a fin type heat exchanger and is connected with a heating heat source of the greenhouse through a hot water supply pipe 14, and the heating heat source is a biomass boiler. The humidifying and cooling section 24 is provided with a wet curtain, a water tank and a circulating water pump, the water tank is supplied with water by a water supplementing pipe 15, and the water source is tap water or a buffer water tank. The fan section 25 is provided with a centrifugal fan, and the rated ventilation rate of a single fan is 80000m3And/h, according to the ventilation quantity requirement, the variable frequency adjusts the wind speed, thereby being beneficial to energy-saving operation.
The blast pipe 8 consists of 4 blast main pipes 81, the size of the initial pipe section of the blast pipe 8 connected with the air outlet section 26 of the air conditioning unit 2 is 1400 multiplied by 1400mm, and the diameter of the initial pipe section is changed along with the extension of the pipe. The blast pipe 8 is buried completely, a square air duct made of brick concrete is adopted, a cover plate is added at the top, and the burying depth is 0.5m below the ground on the upper surface of the air duct. Each blast pipe 8 is provided with an air outlet 9 every 4m, the air outlet 9 adopts a strip-seam type side air supply, the size is 1000 multiplied by 400mm, and the central elevation of the air outlet 9 is 0.25 m. The air outlet 9 is provided with an air valve 10 for adjusting air quantity and ensuring uniform air supply. The blast pipe 8 is provided with a water collecting pit, a sewage pump is installed, and the problem of pipeline water accumulation which possibly occurs is solved.
The return air duct 11 is a bricked concrete air duct, is buried underground, is communicated with the greenhouse and the equipment room 1, has the pipe section specification size of 2000 multiplied by 2000mm near the equipment room 1, and is reduced along with the extension of the pipeline to the greenhouse. A stop valve 12 is arranged at one end of the return air pipe 11 extending into the equipment room 1 to prevent the greenhouse air from being sucked in during the external circulation process of the greenhouse air to influence the cooling or ventilation effect; and return air inlets 13 extending out of the ground are arranged every 4m in the pipe sections in the greenhouse and are used for collecting air conveyed to the greenhouse by the air supply pipe 8 to form greenhouse internal circulation. The return air duct 11 may partially or completely replace the return air function of the inner louver 6.
CO2The generator 3 and the ozone generator 4 are both arranged in the equipment room 1 and are connected with the filter section 22 of the air conditioning unit 2 through the air guide pipeline 18.
The centralized control device 7 is arranged in a power distribution control room adjacent to the equipment room 1, and the data required to be collected by the sensors comprises the air temperature, the humidity and the CO in the greenhouse2Concentration and ozone concentration, and adopts time cooperative control; the priority order of control is temperature, humidity and CO2And (4) controlling the concentration. Ozone disinfection is generally carried out in a fixed time period at night, and germs can be effectively killed.
With the system of this embodiment, the operating modes and corresponding airflow configurations are as follows:
1) when the temperature needs to be reduced in a high-temperature season, the outer ventilating window 5 is opened, the inner ventilating window 6 is closed, and the centrifugal fan of the fan section 25 of the air conditioning unit 2 and the circulating water pump of the humidifying and temperature reducing section 24 are started. The dry hot air entering the equipment room 1 through the external ventilation window 5 enters the air conditioning unit 2, is changed into wet cold air through humidification and temperature reduction and is sent into the greenhouse through the blast pipe 8, the hot air in the greenhouse is discharged through the top opening window, greenhouse air external circulation is formed, and greenhouse temperature reduction, humidification and filtration are completed.
2) When the heating is needed in cold seasons, the inner ventilation window 6 is opened, the outer ventilation window 5 is closed, the centrifugal fan of the fan section 25 of the air conditioning unit 2 is started, and meanwhile, the heating heat source of the greenhouse supplies circulating hot water for the heating section 23 heat exchange coil. The air in the equipment room 1 is heated by the air conditioning unit 2 and is sent into the greenhouse by the blast pipe 8, and then the air in the greenhouse returns to the equipment room 1 through the internal ventilation window 6 or the return air pipe 11 to form the internal circulation of the greenhouse air, thus completing the heating, dehumidification and filtration of the greenhouse.
3) Greenhouse needs to be supplemented with CO2Or during the disinfection by ozone, the ozone generator is used for generating ozone,opening the inner ventilation window 6, closing the outer ventilation window 5, opening the centrifugal fan of the fan section 25 of the air conditioning unit 2, and simultaneously operating CO2A generator 3 or an ozone generator 4. CO22Or ozone is diffused into the greenhouse along with the internal circulation of the greenhouse air to finish greenhouse CO2Supplementary application or ozone disinfection.
4) The greenhouse needs to be dehumidified quickly or the outdoor air is used for supplementing indoor CO2When the air conditioner is started, the outer ventilating window 5 is opened, the inner ventilating window 6 is closed, and the centrifugal fan of the fan section 25 of the air conditioning unit 2 is started. Rapid dehumidification or CO in greenhouse by introducing fresh air through greenhouse air external circulation2And (5) supplementary application.
As shown in fig. 2, the embodiment of the present invention further provides a specific positive pressure ventilation-based greenhouse environment adjusting system, which is as follows:
the embodiment is carried out in a Venlo type multi-span glass greenhouse in the northwest of China, the south-north direction of the greenhouse is 9.6m in span, and the greenhouse cultivation area needing environment comprehensive control is about 2150m2The north area is about 650m by taking the passage in the east and west directions of the greenhouse as a boundary2About 1500m in the south2。
In order to realize comprehensive regulation and control of the environment of the greenhouse, in the embodiment, the system comprises an equipment room 1, an air conditioning unit 2 and CO2Generator 3, ozone generator 4, centralized control device 7, blast pipe 8, air outlet 9, blast gate 10.
The equipment room 1 is 9.6 multiplied by 8 multiplied by 3.2m in specification, is arranged in the greenhouse, is built by the northwest corner of the greenhouse and is specially used for placing equipment devices related to environment regulation and control. In order to facilitate the observation and visit, the equipment room 1 is separated by glass, and the internal space is closed. The equipment room 1 is provided with an outer ventilating window 5 and an inner ventilating window 6, the outer ventilating window 5 is communicated with the outdoor environment, and the inner ventilating window 6 is communicated with the greenhouse. The outer ventilation window 5 is provided with a dustproof insect-proof net, and is used as a system for carrying out first filtering protection of greenhouse air external circulation, so that dust, sundries and pests are prevented from entering the equipment room 1 and entering the greenhouse.
The air conditioning unit 2 comprises 2 air conditioning units, is arranged in the equipment room 1 and comprises an air inlet section 21, a filtering section 22, a heating section 23, a humidifying and cooling section 24, a fan section 25 and an air outlet section 26, wherein the functional sections are sequentially connected. The fan section 25 is provided with a centrifugal fan. Wherein, the air conditioning unit 2 of the north area of the control greenhouse has the external dimension of 5100 multiplied by 2500mm, and the rated ventilation quantity of a centrifugal fan of a fan section 25 is 50000m3The external residual pressure is 550Pa, the installed power is 18.5kW, and three-phase power is realized; the external dimension of the air conditioning unit 2 for controlling the south area is 5900 multiplied by 3800 multiplied by 3100mm, and the rated ventilation quantity of the centrifugal fan is 100000m3The external residual pressure is 600Pa, the installed power is 45kW, and three-phase power is realized. According to the ventilation requirement, the centrifugal fan can regulate the air speed in a variable frequency mode, and energy-saving operation is facilitated.
The air inlet section 21 is provided with a dustproof insect-proof net which is used as a second filtering protection of the system for air external circulation. The filter section 22 is provided with bag-type primary filtration for further filtering dust, worm eggs and the like. The heating section 23 is provided with two groups of fin type heat exchangers which are respectively connected with a heating heat source of the greenhouse through a hot water supply pipe 14, and the heating heat source is municipal heating and a heat pump. According to the greenhouse demand of heating, at first heat for the greenhouse through municipal heating as the heat source, when indoor temperature does not reach the default then open the heat pump and assist the heating, be favorable to realizing the energy integration, reduce the running cost. On the installation of two sets of heat exchange coil of heating section 23 was arranged, the heat exchange coil who leads to municipal heating hydrothermal was closer to air inlet section 21. The humidifying and cooling section 24 is provided with a wet curtain, a water tank and a circulating water pump, the water tank is supplied with water by a water supplementing pipe 15, and the water source is tap water or a buffer water tank. The size of a wet curtain matched with the air conditioning unit 2 with the air volume of 5 ten thousand is 2200 mm multiplied by 2200 mm and the water consumption is 216kg/h, the size of a wet curtain matched with the air conditioning unit 2 with the air volume of 10 ten thousand is 3500 mm multiplied by 2800 mm multiplied by 300mm, the water consumption is 432kg/h, and the air speed of passing the curtain is about 2.85 m/s. In sunny days in midsummer, the air temperature and the relative humidity of the air outlet section 26 are estimated to reach 22.5 ℃ and 96%.
The blast pipe 8 is composed of a main blast pipe 81 and a branch blast pipe 82. The air supply main pipe 81 is completely embedded with an iron sheet spiral air pipe and reinforcing ribs, and has the functions of rust prevention and heat preservation, and the embedding depth is 0.5m below the ground on the upper surface of the air duct. The diameters of the pipelines of the initial section of the air supply main pipe 81 connected with the air outlet section 26 of the air conditioning unit 2 with 5 ten thousand air volumes and 10 ten thousand air volumes are 1600mm and 1200mm respectively, the diameter is changed along with the extension of the pipelines, and the diameter of the pipeline of the air supply main pipe 81 at the tail end is 700 mm. The air supply branch pipe 82 is a thin film air pipe with the diameter of 300mm, is arranged between crop rows above the ground, is suspended below the cultivation frame, and is provided with holes uniformly. The main air supply pipe 81 extends upwards to expose the ground through a tee joint and is connected with the branch air supply pipe 82, and an air valve 10 is arranged at the joint for adjusting the air quantity and ensuring uniform air supply. The main air supply pipe 81 is provided with a water collecting pit and a sewage pump is installed so as to drain accumulated water in time.
In order to ensure smooth circulation of air in the greenhouse, a circulating fan is arranged in the greenhouse, and the air supply direction points to the equipment room 1.
CO2The generator 3 and the ozone generator 4 are both arranged in the equipment room 1 and are connected with the filter section 22 of the air conditioning unit 2 through the air guide pipeline 18.
The centralized control device 7 is arranged in a master control room adjacent to the equipment room 1, and the data needing to be collected by the sensors comprises the air temperature, the humidity and the CO in the greenhouse2Concentration and ozone concentration, and adopts time cooperative control; the priority order of control is temperature, humidity and CO2And (4) controlling the concentration. Ozone disinfection is generally carried out in a fixed time period at night, and germs can be effectively killed.
With the system of this embodiment, the operating modes and corresponding airflow configurations are as follows:
1) when the temperature needs to be reduced in a high-temperature season, the outer ventilating window 5 is opened, the inner ventilating window 6 is closed, and the centrifugal fan of the fan section 25 of the air conditioning unit 2 and the circulating water pump of the humidifying and temperature reducing section 24 are started. The dry hot air entering the equipment room 1 through the external ventilation window 5 enters the air conditioning unit 2, is changed into wet cold air through humidification and temperature reduction and is sent into the greenhouse through the blast pipe 8, the hot air in the greenhouse is discharged through the top opening window, greenhouse air external circulation is formed, and greenhouse temperature reduction, humidification and filtration are completed.
2) When the heating is needed in cold seasons, the inner ventilation window 6 is opened, the outer ventilation window 5 is closed, the centrifugal fan of the fan section 25 of the air conditioning unit 2 is started, and meanwhile, the heating heat source of the greenhouse supplies circulating hot water for the heating section 23 heat exchange coil. The air in the equipment room 1 is heated by the air conditioning unit 2 and is sent into the greenhouse by the blast pipe 8, and then the air in the greenhouse returns to the equipment room 1 through the internal ventilation window 6 to form the internal circulation of the greenhouse air, thus completing the heating, dehumidification and filtration of the greenhouse. In order to ensure smooth circulation of air in the greenhouse, the circulating fan in the greenhouse can be started at the same time.
3) Greenhouse needs to be supplemented with CO2Or during ozone disinfection, the inner ventilating window 6 is opened, the outer ventilating window 5 is closed, the centrifugal fan of the fan section 25 of the air conditioning unit 2 is started, and CO is operated simultaneously2A generator 3 or an ozone generator 4. CO22Or ozone is diffused into the greenhouse along with the internal circulation of the greenhouse air to finish greenhouse CO2Supplementary application or ozone disinfection.
4) The greenhouse needs to be dehumidified quickly or the outdoor air is used for supplementing indoor CO2When the air conditioner is started, the outer ventilating window 5 is opened, the inner ventilating window 6 is closed, and the centrifugal fan of the fan section 25 of the air conditioning unit 2 is started. Rapid dehumidification or CO in greenhouse by introducing fresh air through greenhouse air external circulation2And (5) supplementary application.
As shown in fig. 3, another embodiment of the present invention provides a specific positive pressure ventilation-based greenhouse environment adjusting system, which comprises the following components:
the embodiment is carried out in a seedling growing sunlight greenhouse in the North China, and the greenhouse has the east-west trend, the east-west length of 100m and the span of 16 m.
In order to realize the comprehensive regulation and control of the environment of the greenhouse, the system comprises an air conditioning unit 2 and CO in the embodiment2Generator 3, ozone generator 4, centralized control device 7, blast pipe 8, air outlet 9, blast gate 10, first diverter valve 16 and second diverter valve 17.
The air conditioning units 2 total 1, have the external dimension of 5400 multiplied by 3800 multiplied by 3200mm, and are arranged inside the sunlight greenhouse near a gable, preferably the gable near one end of the greenhouse inlet. The air conditioning unit 2 comprises an air inlet section 21, a filtering section 22, a heating section 23, a humidifying and cooling section 24, a fan section 25 and an air outlet section 26, and the functional sections are connected in sequence. The fan section 25 is provided with a centrifugal fan with rated ventilation volume of 100000m3The external residual pressure is 600Pa, the installed power is 45kW, and three-phase power is realized. According to the ventilation quantity requirement, the centrifugal fan can regulate the air speed in a variable frequency mode, and energy-saving operation is facilitated.
Because the air conditioning unit 2 is directly placed in the greenhouse without the equipment room 1, the air inlet section 21 comprises a first air inlet section and a second air inlet section, and a first switching valve 16 and a second switching valve 17 are respectively arranged, so that the switching operation of the internal circulation and the external circulation of the greenhouse air is realized. Wherein, the first air inlet section that sets up first switching valve 16 passes greenhouse wall body and outdoor intercommunication to preferably set up the ventilation window in the wall body outside of wall body run-through mouth, in order to prevent the heat loss that winter is caused by cold wind infiltration and heat-conduction, the ventilation window sets up dustproof insect-proof net simultaneously, prevents that dust, debris and pest from getting into the greenhouse. The second air inlet section provided with the second switching valve 17 is communicated with the indoor space, and a dustproof and insect-proof net is also arranged, so that dust can be removed in the internal circulation process of the greenhouse air, and sundries can be prevented from entering the air conditioning unit 2. The filter section 22 is provided with bag-type primary filtration for further filtering dust, worm eggs and the like. The heating section 23 is provided with a fin type heat exchanger and is connected with a heating heat source of the greenhouse through a hot water supply pipe 14, the heating heat source is a heat storage water tank, and heat stored in the heat storage water tank comes from a solar heat collector, a heat pump and the like. The heat exchanger can not only release heat at night for heating, but also can operate at daytime to collect rich waste heat energy in the sunlight greenhouse, thereby realizing the transfer and high-efficiency utilization of the energy of the sunlight greenhouse. The humidifying and cooling section 24 is provided with a wet curtain, a water tank and a circulating water pump, the water tank is supplied with water by a water supplementing pipe 15, and the water source is tap water or a buffer water tank.
The blast pipe 8 is composed of 1 blast main pipe 81. The blast pipe 8 adopts a buried iron sheet spiral air pipe, the buried depth is 0.5m below the ground on the upper surface of the air flue, and the laying position is underground at a south roof angle and extends along the east-west direction. The diameter of the pipeline of the initial section of the blast pipe 8 connected with the air outlet section 26 of the air conditioning unit 2 is 1600mm, and the diameter is changed along with the extension of the pipeline. The blast pipe 8 is provided with an air outlet 9 every 2m, the material PVC is that the diameter of the air outlet 9 is 200mm, and the air outlet is inclined upwards by 45 degrees. The air outlet 9 is provided with an air valve 10 for adjusting air quantity and ensuring uniform air supply. The blast pipe 8 is provided with a water collecting pit, and a sewage pump is arranged so as to drain accumulated water in time.
CO2The generator 3 and the ozone generator 4 are both mounted near the air conditioning unit 2 in the greenhouse and are connected to the filter section 22 of the air conditioning unit 2 via the air duct 18.
The centralized control device 7 is arranged at the entrance of the greenhouse or in the buffer room, and the data needing to be collected by the sensors comprise the temperature, the humidity and the CO of the air in the greenhouse2Concentration andozone concentration and time cooperative control are adopted; the priority order of control is temperature, humidity and CO2And (4) controlling the concentration. Ozone disinfection is generally carried out in a fixed time period at night, and germs can be effectively killed.
With the system of this embodiment, the operating modes and corresponding airflow configurations are as follows:
1) when the temperature needs to be reduced in a high-temperature season, the first switching valve 16 is opened, the second switching valve 17 is closed, and the centrifugal fan of the fan section 25 of the air conditioning unit 2 and the circulating water pump of the humidifying and temperature reducing section 24 are started. Outdoor dry hot air enters the air conditioning unit 2 from an air inlet section 21 provided with a first switching valve 16, is changed into wet cold air through humidification and temperature reduction and is sent into the greenhouse through an air supply pipe 8, and hot air in the greenhouse is discharged through a top opening window to form greenhouse air external circulation so as to finish greenhouse temperature reduction, humidification and filtration.
2) When the heating is needed in cold seasons, the second switching valve 17 is opened, the first switching valve 16 is closed, the centrifugal fan of the fan section 25 of the air conditioning unit 2 is started, and meanwhile, the heating heat source of the greenhouse supplies circulating hot water for the heat exchange coil of the heating section 23. The air in the sunlight greenhouse is heated by the air conditioning unit 2 and is sent into the greenhouse by the blast pipe 8, and then the air in the greenhouse returns to the air conditioning unit 2 through the second air inlet section provided with the second switching valve 17 to form greenhouse air internal circulation, so that the heating, the dehumidification and the filtration of the greenhouse are completed.
3) Greenhouse needs to be supplemented with CO2Or during ozone disinfection, the second switching valve 17 is opened, the first switching valve 16 is closed, the centrifugal fan of the fan section 25 of the air conditioning unit 2 is started, and CO is operated simultaneously2A generator 3 or an ozone generator 4. CO22Or ozone is diffused into the greenhouse along with the internal circulation of the greenhouse air to finish greenhouse CO2Supplementary application or ozone disinfection.
4) The greenhouse needs to be dehumidified quickly or the outdoor air is used for supplementing indoor CO2At this time, the first switching valve 16 is opened, the second switching valve 17 is closed, and the centrifugal fan of the fan section 25 of the air conditioning unit 2 is turned on. Rapid dehumidification or CO in greenhouse by introducing fresh air through greenhouse air external circulation2And (5) supplementary application.
As can be seen from the above examples, the present invention provides positive pressure ventilation based greenhouse environment regulationThe system is an organic integrated body, has excellent air flow organization capacity due to a positive pressure ventilation mode, and can comprehensively heat, cool, humidify, dehumidify and CO2The comprehensive greenhouse environment management and control system has the advantages that the comprehensive greenhouse environment management and control capacity and efficiency are improved due to the additional application, air filtration, ozone disinfection and other environment regulation and control functions, the indoor air quality is controlled from the source, and the efficient, high-quality, clean and safe production of the greenhouse is finally guaranteed. Because each item environment regulation and control function can share one set of air pipe and centralized control, the system integrated level is high, and the construction cost reduces by a wide margin. The system has universality and is suitable for various greenhouses, including large and medium multi-span greenhouses, sunlight greenhouses, plastic greenhouses and the like; is suitable for building and modifying a promoted greenhouse. The system changes partial environment regulation measures, such as cooling of a wet curtain fan, from structuralization to equipping, and is favorable for realizing intelligent management of the greenhouse.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (9)

1. A greenhouse environment adjusting system based on positive pressure ventilation is characterized by comprising an air conditioning unit, an air supply pipe and CO2A generator, an ozone generator and a device room;
the air supply pipe is arranged in the greenhouse, an air inlet of the air supply pipe is connected with the air conditioning unit, and the air supply pipe is provided with a plurality of air outlets;
the CO is2The generator is used for increasing CO in the greenhouse2Concentration;
the ozone generator is used for generating ozone for disinfecting the greenhouse;
the air conditioning unit and the CO2The generator and the ozone generator are both arranged in the equipment room; the equipment room comprises an outer ventilating window communicated with the external space and an inner ventilating window communicated with the greenhouse.
2. According to claimClaim 1 the greenhouse environment conditioning system based on positive pressure ventilation, characterized in that the air conditioning unit comprises an air intake section and a filter section which are connected, the CO is2The generator and the ozone generator are both connected with the filtering section through an air guide pipeline.
3. The positive-pressure ventilation-based greenhouse environment conditioning system according to claim 2, wherein the air intake section comprises a first air intake section and a second air intake section which are arranged in parallel, the first air intake section is communicated with an external space, and the second air intake section is communicated with the greenhouse; the inlet of the first air inlet section is provided with a first switching valve, and the inlet of the second air inlet section is provided with a second switching valve.
4. The positive-pressure ventilation-based greenhouse environment adjusting system as claimed in claim 2, wherein the air conditioning unit further comprises a heating section, a humidifying and cooling section, a fan section and an air outlet section which are arranged in sequence; the heating section is connected with the filtering section, and the air outlet section is connected with an air inlet of the air supply pipe.
5. The positive-pressure ventilation-based greenhouse environment adjusting system as claimed in claim 2, wherein the air intake section is provided with a dustproof insect-proof net, and the filter section is provided with a primary filter screen.
6. The positive draft based greenhouse environment conditioning system according to claim 4, wherein the heating section is provided with a heat exchange coil, and the heat exchange coil is connected with a heating heat source of the greenhouse through a heat supply water pipe.
7. The positive-pressure ventilation-based greenhouse environment adjusting system as claimed in claim 4, wherein the humidifying and cooling section is provided with a wet curtain, a water tank and a circulating water pump, and the water tank is connected with a water replenishing source of the greenhouse through a water replenishing pipe.
8. The positive draft based greenhouse environment conditioning system according to claim 1, further comprising a return air duct, said return air duct comprising a return air outlet and a plurality of return air inlets, said return air outlet being located within said plant room and a plurality of said return air inlets being located within said greenhouse.
9. The positive-pressure ventilation-based greenhouse environment adjusting system according to claim 1, wherein the air outlet is provided with an air valve, and the air valve is used for controlling the opening degree of the air outlet.
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