CN109681994B - Scientific greenhouse wet curtain cooling device and control method - Google Patents
Scientific greenhouse wet curtain cooling device and control method Download PDFInfo
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- CN109681994B CN109681994B CN201910015689.8A CN201910015689A CN109681994B CN 109681994 B CN109681994 B CN 109681994B CN 201910015689 A CN201910015689 A CN 201910015689A CN 109681994 B CN109681994 B CN 109681994B
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- 238000001816 cooling Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 67
- 238000009423 ventilation Methods 0.000 claims abstract description 34
- 230000001105 regulatory effect Effects 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 230000001276 controlling effect Effects 0.000 claims abstract description 9
- 241000238631 Hexapoda Species 0.000 claims abstract description 8
- 230000005855 radiation Effects 0.000 claims description 37
- 238000007789 sealing Methods 0.000 claims description 12
- 238000005265 energy consumption Methods 0.000 claims description 9
- 239000012209 synthetic fiber Substances 0.000 claims description 6
- 229920002994 synthetic fiber Polymers 0.000 claims description 6
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 239000011152 fibreglass Substances 0.000 claims description 3
- 239000008397 galvanized steel Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 5
- 230000001717 pathogenic effect Effects 0.000 abstract description 2
- 244000052769 pathogen Species 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 239000007921 spray Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 241000607479 Yersinia pestis Species 0.000 description 2
- 244000000037 crop pathogen Species 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0003—Exclusively-fluid systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/082—Grilles, registers or guards
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
- F24F2110/22—Humidity of the outside air
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- 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
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/272—Solar heating or cooling
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- 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
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/20—Solar thermal
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/14—Measures for saving energy, e.g. in green houses
Abstract
The invention discloses a scientific greenhouse wet curtain cooling device and a control method. The wet curtain facade is covered with the diversion net, and the wet curtain water tank is designed by adopting a large cornice, so that the wet curtain is effectively prevented from dripping and leaking. By adopting feedforward PID control, the accuracy of natural ventilation cooling and wet curtain fan cooling conversion and the stability of equipment operation are improved through the expected feedforward of indoor temperature. After the device is started, the fan adopts variable frequency control to adjust the fresh air quantity entering the greenhouse, so that the aim of accurately regulating and controlling the indoor temperature of the greenhouse is fulfilled, and the defect that the temperature amplitude in the greenhouse is overlarge due to the starting and stopping of the traditional wet curtain fan is avoided. Through the design of bottom positive pressure type air supply, the effective use area of the greenhouse is increased, and the entry of the pathogen and insect sources of greenhouse crops is reduced.
Description
Technical Field
The invention relates to the technical field of greenhouse cooling, in particular to a scientific greenhouse wet curtain cooling device and a control method.
Background
The scientific research greenhouse generally has more subareas, the area of a single subarea is smaller, all subareas are adjacent to each other or are connected through a corridor, and the scientific research greenhouse is provided with more equipment. Therefore, scientific research greenhouses have more difficulties in the design of greenhouse structures and the spatial layout of equipment. The wet curtain and the fan of the traditional greenhouse are respectively arranged on two opposite sides of the greenhouse, negative pressure is formed in the greenhouse by exhausting air through the fan, so that outdoor dry hot air passes through the wet curtain, water in the wet curtain is gasified and absorbed, and the temperature is reduced. The traditional cooling mode of the wet curtain of the fan often causes insufficient lighting of the fan and the wet curtain side in the greenhouse due to sun shading of the wet curtain and the fan, and the local influence is smaller than the whole greenhouse under the condition of larger greenhouse area; under the condition that the area of a single partition of the scientific research greenhouse is smaller, the influence of the sun-shading of the wet curtain and the fan on the lighting of the whole greenhouse becomes serious. Meanwhile, under the condition of smaller area, necessary spaces such as an access opening, a channel and the like are also arranged, so that the problems of insufficient area of an air inlet of a wet curtain, uneven temperature distribution in a scientific research greenhouse and the like are often caused, and the cooling effect of the scientific research greenhouse is poor. The traditional negative pressure fan wet curtain cooling device is easy to cause crop pathogen and insect source in the greenhouse to be inhaled through gaps among windows, doors and glass. In the wet curtain structural design, the conventional wet curtain is dripped and leaked due to factors such as side flatness and the like, so that blue algae, harmful bacteria and the like in the greenhouse are propagated, and the normal operation of the greenhouse is affected.
In the control of the wet curtain fan device, the switching judgment between the starting and the natural ventilation of the fan wet curtain device is inaccurate, the traditional wet curtain is only controlled to be started or stopped according to the indoor temperature, and the actual cooling effect and the energy consumption efficiency are not considered; in the control of the fan, proper cooling ventilation quantity cannot be obtained by adopting simple starting and stopping control, and the indoor temperature becomes too large in amplitude, and air flow is suddenly started and stopped, so that the steady state of the indoor environment of the greenhouse is poor, and the normal growth of crops in the greenhouse is influenced. In addition, frequent equipment start and stop can also affect the normal operation and service life of the equipment, and the power distribution and power supply of the equipment.
Disclosure of Invention
In order to overcome the defects of the conventional wet curtain cooling device of the scientific greenhouse, the invention provides the fan wet curtain cooling device suitable for the scientific greenhouse and the control method, and the wet curtain cooling device of the scientific greenhouse can be widely applied to the scientific greenhouse and the small test greenhouse which have high environmental control precision and good cooling and disease and insect pest prevention effects.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the utility model provides a scientific research greenhouse wet curtain heat sink for cool down for the greenhouse, this heat sink includes the radiation sensor that is used for detecting outdoor solar radiation value, be used for the wind speed sensor of outdoor wind speed, the water conservancy diversion net, sealed lid, be used for detecting outdoor dry bulb temperature sensor of outdoor temperature, be used for detecting outdoor wet bulb temperature sensor of outdoor temperature, the water pump, wet curtain pond, the return flume, the wind channel, variable frequency fan, the ventilation pipe, be used for detecting indoor temperature indoor dry bulb temperature sensor, be used for detecting indoor wet bulb temperature sensor of indoor temperature, the plant, the grid board, the roof window motor, box wet curtain; a grid plate is arranged in the greenhouse to divide the greenhouse into an upper part and a lower part; placing plants on the grid plate; a top window is arranged at the top of the greenhouse and is driven to open and close by a top window motor; the lower part of the greenhouse is provided with a plurality of ventilation pipes, the ventilation pipes are connected with one end of the air duct, a variable frequency fan is arranged at the connection part, a plurality of air outlets are arranged on the ventilation pipes, and the other end of the air duct is connected with the air outlets of the box-type wet curtain; the inner side and the outer side of the box-type wet curtain are covered with a diversion net; a water return tank is arranged below the box-type wet curtain and is communicated with the wet curtain pool, and a water pump is arranged in the wet curtain pool; pumping water in the wet curtain pool by a water pump, and injecting the water into the guide net; the top end of the box-type wet curtain is provided with a sealing cover, and the radiation sensor, the wind speed sensor, the indoor dry bulb temperature sensor, the indoor wet bulb temperature sensor, the outdoor dry bulb temperature sensor, the outdoor wet bulb temperature sensor, the water pump, the variable frequency fan and the top window motor are all connected with the controller.
Furthermore, the grid plate is made of glass fiber reinforced plastic or galvanized steel.
Further, the box-type wet curtain is a box body formed by combining four identical wet curtain blocks, the middle cavity of the box body is an air channel, the periphery of the box body is provided with air inlets, the upper part of the box-type wet curtain is provided with a sealing cover, and the box-type wet curtain air outlet is positioned between the wet curtain box body and the wet curtain pool.
Further, the meshes of the diversion net are of a diamond structure, and the length of the meshes is 5 mm-15 mm; the diversion net is woven by synthetic fiber net wires, and the diameter of the synthetic fiber net wires is 0.1 mm-0.6 mm.
Furthermore, the water return groove is of a large cornice structure, and the cornice width is 20-50 mm.
Further, the linear distance between the ground center position of the box-type wet curtain and the air inlet at the bottom of the greenhouse is 2-6 meters.
Further, the radiation sensor and the wind speed sensor are fixed right above the gutter of the greenhouse; the indoor dry bulb temperature sensor and the indoor wet bulb temperature sensor are arranged in the center of the greenhouse; the outdoor dry bulb temperature sensor and the outdoor wet bulb temperature sensor are arranged on the outer edge of the sealing cover.
Further, air inlet insect-proof nets are arranged at the air inlets around the box-type wet curtain.
Further, the top window is covered with a top window insect-proof net.
The invention also provides a control method of the wet curtain cooling device of the scientific greenhouse, which is characterized by comprising the following steps:
firstly, setting a temperature threshold T for starting a variable frequency fan on a controller f Temperature threshold T for starting water pump b Energy consumption efficiency threshold T for starting water pump h The method comprises the steps of carrying out a first treatment on the surface of the The controller receives information transmitted by the radiation sensor, the wind speed sensor, the indoor dry bulb temperature sensor, the indoor wet bulb temperature sensor, the outdoor dry bulb temperature sensor and the outdoor wet bulb temperature sensor in real time;
step two, the information detected by the outdoor dry bulb temperature sensor, the wind speed sensor and the radiation sensor is transmitted to a controller, and the controller calculates the indoor expected air temperature and the indoor expected air temperature T according to the received outdoor air temperature, the radiation intensity, the influence value of the wind speed on the indoor temperature and under the condition of natural ventilation with windows q The calculation is as follows:
T q ＝T o +T r +T w +T v +T s
T O ＝k 1 ×(t 1 -t 0 )
T r ＝k 2 ×(r 1 -r 0 )
T w ＝k 3 ×(s-s 0 )
T v ＝k 4 ×(v-v 0 )
t in q Is the indoor expected air temperature; t (T) S Is a set standard temperature; t (T) o The influence value of the outdoor temperature on the indoor temperature is obtained; t (T) r Is the influence value of solar radiation intensity on indoor temperature; t (T) w The influence value of the outdoor wind speed on the indoor temperature is obtained; t (T) v The influence of natural window opening of a greenhouse on the indoor temperature is compared; k (k) 1 To calculate the influence coefficient of outdoor temperature to the influence value of indoor temperature, t 1 T is the current outdoor temperature 0 For a specified outdoor temperature reference value k 2 To calculate the influence coefficient of the temperature influence value in the solar radiation intensity room, r 1 R is the current outdoor radiation intensity 0 A reference value for a specified outdoor radiation intensity; k (k) 3 To calculate the influence value of the outdoor wind speed and the indoor temperatureS is the current outdoor wind speed, s 0 A reference value for a specified outdoor wind speed; k (k) 4 In order to calculate the influence coefficient of the influence value of the greenhouse windowing ratio on the indoor temperature, v is the current greenhouse windowing ratio, v 0 A reference value for the specified greenhouse window ratio;
if the indoor current expected air temperature t q (n) the difference between the indoor temperature reduction target temperature T (n) and the set temperature is higher than the temperature threshold T for starting the fan f I.e. (t) q (n)-t(n))≥T f The controller controls the top window to be opened, and the variable-frequency fan starts to work; otherwise, the controller controls the top window to stop working;
step three, when the controller controls the variable frequency fan to start working, the rotational speed of the variable frequency fan is controlled and regulated by the PID for the variable frequency fan, and the ventilation of the greenhouse is regulated;
t (n) is the target temperature of indoor cooling, t 3 (n) is the feedback air temperature actually measured by the current indoor dry bulb temperature sensor, and the output frequency f (x) of the frequency conversion fan is represented by t (n) and t 3 (n) determining, if t 3 (n) is not less than t (n), the output frequency f (x) of the frequency converter is increased, the rotating speed of the frequency conversion fan is increased until the indoor dry bulb temperature sensor actually detects the air temperature t 3 (n) is equal to the set indoor target temperature t (n); conversely, if t 3 (n)<t (n), the output frequency f (x) of the frequency converter is reduced, the rotating speed of the fan is reduced until the indoor dry bulb temperature sensor actually measures the air temperature t 3 (n) is equal to the set indoor target temperature t (n);
and fourthly, detecting signals of the indoor dry bulb temperature sensor, the indoor wet bulb temperature sensor, the outdoor dry bulb temperature sensor and the outdoor wet bulb temperature sensor once every m minutes, transmitting the detected signals to a controller, and controlling the water pump to start and stop according to the detected signals by the controller, wherein the calculation is as follows:
wherein P is the starting and stopping state of the water pump, 1 is the starting state, and 0 is the stopping state; t is t 4 (n) is a temperature value detected by an indoor wet bulb temperature sensor; t is t 3 (n) is a temperature value detected by an indoor dry bulb temperature sensor; t is t 2 (n) is a temperature value detected by an outdoor wet bulb temperature sensor; t is t 1 (n) is a temperature value detected by an outdoor dry bulb temperature sensor; t (n) is a set greenhouse cooling target temperature; t is t q (n) is the current greenhouse expected temperature calculated by the controller according to the outdoor weather factors; t (T) b Setting a temperature threshold value for starting and cooling the water pump; t (T) h Setting an energy consumption benefit threshold value of water pump operation;
the controller controls the starting or stopping of the variable frequency fan, the starting and stopping of the water pump and the opening and closing of the top window in the device through the first step to the fourth step, and adjusts the ventilation quantity of the variable frequency fan according to the calculated fresh air quantity outdoors, so that the temperature and the humidity in the greenhouse are adjusted, and the indoor temperature and the humidity reach the set requirements.
The beneficial effects of the invention are as follows: the box-type design of the wet curtain facilitates the separation arrangement of the wet curtain and the greenhouse. By the separate arrangement of the wet curtain and the greenhouse, the sun-shading effect of the wet curtain on the greenhouse is solved. The upper space and the lower space of the greenhouse are isolated through the grid plates, and the ventilation pipe and the variable frequency fan are arranged at the lower part, so that the influence of the fan on shading of the greenhouse by the traditional wet curtain fan cooling device is eliminated, meanwhile, the effective use area of the greenhouse is increased through the design of bottom positive pressure type air supply, and the suction of pathogenic and insect sources of greenhouse crops from gaps such as greenhouse windows, doors and glass is reduced. The bottom of the greenhouse is provided with the air inlet, the top is provided with the air outlet, the natural lifting force of hot air is effectively utilized in the vertical convection of cold air and hot air, the ventilation efficiency is improved, and the cooling energy consumption is reduced. The wet curtain facade is covered with the diversion net, and the wet curtain water tank is designed by adopting a large cornice, so that the wet curtain is effectively prevented from dripping and leaking.
In the control method, feedforward PID control is adopted, and the controller calculates the expected temperature in the greenhouse for feedforward according to the outdoor dry bulb air temperature and the influence value of radiation intensity, wind speed and windowing comparison on the indoor temperature, so that timely conversion between natural ventilation cooling and wet curtain fan cooling is accurately judged, and the accuracy of temperature control and the stability of equipment operation are improved. After the device starts to operate, the fan adopts variable frequency control to adjust the fresh air quantity entering the greenhouse, so that the aim of accurately regulating and controlling the indoor temperature of the greenhouse is fulfilled, and the defect that the temperature in the greenhouse is severely changed due to the starting and stopping of the traditional fan is overcome. The temperature reduction efficiency of the wet curtain water pump is measured by comparing the difference value of the dry bulb temperature and the wet bulb temperature outside the greenhouse with the difference value of the dry bulb temperature and the wet bulb temperature inside the greenhouse, and the energy efficiency of the wet curtain water pump is improved according to the setting of the threshold value.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a side view of the cooling mode of the present invention;
FIG. 3 is a block diagram of a wet curtain of the present invention;
FIG. 4 is a cross-sectional view of the wet curtain of the present invention;
in the figure, a greenhouse 1, a radiation sensor 2, an air speed sensor 3, a guide net 4, a water spray pipe 5, a sealing cover 6, an outdoor dry bulb temperature sensor 7, an outdoor wet bulb temperature sensor 8, a wet curtain block 9, an air inlet insect-proof net 10, a water supply pipe 11, a water pump 12, a wet curtain pool 13, a water drain pipe 14, a water return tank 15, an air duct 16, a variable frequency fan 17, a ventilation pipe 18, an air outlet 19, an indoor dry bulb temperature sensor 20, an indoor wet bulb temperature sensor 21, a cross beam 22, an upright post 23, plants 24, a grid plate 25, a top window 26, a top window motor 27 and a top window insect-proof net 28.
Detailed Description
The invention is further illustrated by the following figures and examples;
as shown in fig. 1-2, a cooling device for a wet curtain of a scientific greenhouse is used for cooling a greenhouse 1, and comprises a radiation sensor 2 for detecting an outdoor solar radiation value, a wind speed sensor 3 for detecting an outdoor wind speed, a diversion net 4, a spray pipe 5, a sealing cover 6, an outdoor dry bulb temperature sensor 7 for detecting an outdoor temperature, an outdoor wet bulb temperature sensor 8 for detecting an outdoor air temperature, a wet curtain block 9, an air inlet insect net 10, a water supply pipe 11, a water pump 12, a wet curtain pool 13, a water drain pipe 14, a water return tank 15, an air duct 16, a variable frequency fan 17, a ventilation pipe 18, an air outlet 19, an indoor dry bulb temperature sensor 20 for detecting an indoor temperature, an indoor wet bulb temperature sensor 21 for detecting an indoor air temperature, a beam 22, a stand 23, a plant 24, a grid plate 25, a top window 26, a top window motor 27, a top window insect net 28 and a box type wet curtain. The greenhouse 1 is provided with a plurality of upright posts 23 and a plurality of cross beams 22, a grid plate 25 is arranged above the cross beams 22, the greenhouse 1 is divided into an upper part and a lower part, and plants 24 are arranged on the grid plate 25 for testing. The top of the greenhouse 1 is provided with a top window 26, the top window 26 is driven to open and close by a top window motor 27 (the connection mode for controlling the opening and closing is a conventional means, the top window motor 27 can directly drive the rotation shaft of the top window 26 to rotate, or a connecting piece can be adopted to transmit power to the top window 26), and the top window 26 is covered with a top window insect-proof net 28. The greenhouse is characterized in that a plurality of ventilation pipes 18 are arranged at the lower part of the greenhouse 1, the ventilation pipes 18 are connected with one end of an air duct 16, a variable frequency fan 17 is arranged at the connection part, a plurality of air outlets 19 are arranged on the ventilation pipes 18, and the other end of the air duct 16 is connected with the air outlets of the box-type wet curtain. The box-type wet curtain is formed by combining four identical wet curtain blocks 9, air inlets are formed in the periphery of the box-type wet curtain, and an air inlet insect-proof net 10 is arranged at the air inlet. The inner side and the outer side of the wet curtain block 9 are covered with the flow guide net 4, a water spray pipe 5 is arranged on the wet curtain block 9, the water spray pipe 5 is connected with a water supply pipe 11, the water supply pipe 11 is connected with a water pump 12, and the water pump 12 is arranged at the bottom of the wet curtain pool 13. A water return groove 15 is arranged below the wet curtain block 9, a drain pipe 14 is arranged at the lower end of the water return groove 15, and the drain pipe 14 is connected with the wet curtain pool 13. The top end of the box-type wet curtain is provided with a sealing cover 6, an outdoor weather box is arranged at the outer edge of the sealing cover 6, and an outdoor dry bulb temperature sensor 7 and an outdoor wet bulb temperature sensor 8 are arranged in the outdoor weather box. A radiation sensor 2 and a wind speed sensor 3 are arranged at the gutter outside the greenhouse 1. An indoor weather box is arranged in the center of the greenhouse 1, and an indoor dry bulb temperature sensor 20 and an indoor wet bulb temperature sensor 21 are arranged in the indoor weather box. The radiation sensor 2, the wind speed sensor 3, the indoor dry bulb temperature sensor 20, the indoor wet bulb temperature sensor 21, the outdoor wet bulb temperature sensor 8, the outdoor wet bulb temperature sensor, the water pump 12, the variable frequency fan 17 and the top window motor 27 are all connected with a controller. The controller may be a ZJU-AES-09 model of university of Zhejiang, but is not limited thereto.
Further, the grid plate 25 may be made of glass fiber reinforced plastic or galvanized steel, the grid is generally rectangular in shape, the size and specification can be 25mm 60mm, preferably 38mm, and the thickness of the grid plate 25 is 25 mm-50 mm, preferably 38mm.
Further, the box-type wet curtain cloth is arranged at a position which is a certain distance away from the greenhouse 1 and is connected with the bottom of the greenhouse 1 which is separated from the grid plate 25 through the air duct 16. The linear distance between the ground center position of the box-type wet curtain and the air inlet at the bottom of the greenhouse 1 is 2-6 meters, preferably 4 meters. .
The box type wet curtain is a box type design as shown in fig. 3-4, and is formed by combining four identical wet curtain blocks 9, wherein an air duct 16 is arranged in the middle cavity of the box, and air inlets are arranged at the periphery. The upper part is provided with a sealing cover 6, and a wet curtain air outlet 19 is positioned between the wet curtain box body and the wet curtain pool 13. The mesh of the diversion net 4 is of a diamond structure, the length of the mesh is 5 mm-15 mm, preferably 10mm, the diversion net 4 can be woven by synthetic fiber net wires, and the diameter of the synthetic fiber net wires is 0.1 mm-0.6 mm, preferably 0.3mm. The lower end of the box-type wet curtain is provided with a water tank which is designed for a large cornice, and the width of the cornice is 20-50 mm, preferably 35mm.
In the control of the scientific research greenhouse wet curtain cooling device, feedforward PID control is adopted, and a controller calculates the expected temperature in the greenhouse to perform feedforward according to the influence value of outdoor dry-bulb air temperature, radiation intensity, air speed and windowing comparison on indoor temperature, accurately judges timely conversion between natural ventilation cooling and wet curtain fan cooling, and improves the accuracy of indoor temperature control and the stability of equipment operation. After the device starts to operate, the fan adopts variable frequency control, and the fresh air quantity entering the greenhouse 1 is regulated through PID control, so that the aim of accurately regulating and controlling the indoor temperature of the greenhouse 1 is fulfilled, and the defect that the temperature in the greenhouse 1 is severely changed due to the starting and stopping of the traditional fan is overcome. The cooling efficiency of the operation of the water pump 12 is measured by comparing the difference value of the outdoor dry bulb temperature and the wet bulb temperature with the difference value of the indoor dry bulb temperature and the wet bulb temperature, and the operation of the water pump 12 is started and stopped according to the setting of the threshold value, so that the energy efficiency of the operation of the water pump 12 is improved.
The method specifically comprises the following steps:
firstly, setting a threshold T for indoor fan cooling starting on a controller f Wet curtain water pump12 temperature threshold T for start-up b Energy consumption efficiency threshold T for start-up of wet curtain water pump 12 h The method comprises the steps of carrying out a first treatment on the surface of the The controller receives information transmitted by the outdoor radiation sensor 2, the wind speed sensor 3, the indoor dry bulb temperature sensor 20, the indoor wet bulb temperature sensor 21, the outdoor dry bulb temperature sensor 7 and the outdoor wet bulb temperature sensor 8 in real time.
Step two, the information detected by the outdoor dry bulb temperature sensor 7, the wind speed sensor 3 and the radiation sensor 2 is transmitted to a controller, and the controller calculates the indoor expected air temperature and the indoor expected air temperature T according to the received outdoor air temperature, the radiation intensity, the influence value of the wind speed on the indoor temperature and under the condition of natural ventilation with windows q The calculation is as follows:
T q ＝T o +T r +T w +T v +T s
T O ＝k 1 ×(t 1 -t 0 )
T r ＝k 2 ×(r 1 -r 0 )
T w ＝k 3 ×(s-s 0 )
T v ＝k 4 ×(v-v 0 )
t in q Is the indoor expected air temperature; t (T) S Is a set standard temperature; t (T) o The influence value of the outdoor temperature on the indoor temperature is obtained; t (T) r Is the influence value of solar radiation intensity on indoor temperature; t (T) w The influence value of the outdoor wind speed on the indoor temperature is obtained; t (T) v The influence of natural windowing of the greenhouse 1 on the indoor temperature is compared; k (k) 1 To calculate the influence coefficient of outdoor temperature to the influence value of indoor temperature, t 1 T is the current outdoor temperature 0 For a specified outdoor temperature reference value k 2 To calculate the influence coefficient of the temperature influence value in the solar radiation intensity room, r 1 R is the current outdoor radiation intensity 0 A reference value for a specified outdoor radiation intensity; k (k) 3 In order to calculate the influence coefficient of the influence value of the outdoor wind speed and the indoor temperature, s is the current outdoor wind speed, s 0 A reference value for a specified outdoor wind speed; k (k) 4 To calculate the influence value of the window opening ratio of the greenhouse 1 on the indoor temperatureV is the current window ratio of greenhouse 1, v 0 Window ratio reference value for the designated greenhouse 1.
If the indoor current expected air temperature t q (n) the difference between the set indoor cooling target temperature T (n) is higher than the temperature threshold T for starting cooling f I.e. (t) q (n)-t(n))≥T f The controller controls the top window motor 27 to be started, and the variable frequency fan 17 starts to work; otherwise, the controller controls the window motor 27 to stop working.
And step three, when the controller controls the variable frequency fan 17 to start working, the rotational speed of the variable frequency fan 17 is controlled and regulated by utilizing PID (proportion integration differentiation) for the variable frequency fan, and the ventilation quantity of the greenhouse 1 is regulated.
t (n) is the target temperature of indoor cooling, t 3 (n) is the feedback air temperature actually measured by the current indoor dry bulb temperature sensor 20, and the output frequency f (x) of the frequency conversion fan is represented by t (n) and t 3 (n) determining. If t 3 (n) is not less than t (n), the output frequency f (x) of the frequency converter is increased, and the rotating speed of the variable frequency fan 17 is increased until the indoor dry bulb temperature sensor 20 actually detects the air temperature t 3 (n) is equal to the set indoor target temperature t (n). Conversely, if t 3 (n)<t (n), the output frequency f (x) of the frequency converter is reduced, and the rotation speed of the fan is reduced until the indoor dry bulb temperature sensor 20 actually measures the air temperature t 3 (n) is equal to the set indoor target temperature t (n).
Step four, the indoor dry bulb temperature sensor 20, the indoor wet bulb temperature sensor 21, the outdoor dry bulb temperature sensor 7 and the outdoor wet bulb temperature sensor 8 perform signal detection once every m minutes, the value of m is 1-10, preferably 5, the detected signals are transmitted to the controller, and the controller controls the wet curtain water pump 12 to start and stop according to the detected signals, and the calculation is as follows:
wherein P is the starting and stopping state of the water pump 12, 1 is open, and 0 is closed; t is t 4 (n) is a temperature value detected by the indoor wet bulb temperature sensor 21; t is t 3 (n) is a temperature value detected by the indoor dry bulb temperature sensor 20; t is t 2 (n) is a temperature value detected by the outdoor wet bulb temperature sensor 8; t is t 1 (n) is the temperature value detected by the outdoor dry bulb temperature sensor 7; t (n) is the set current temperature reduction target temperature of the greenhouse 1; t is t q (n) is the expected temperature of the current greenhouse 1 calculated by the controller according to the outdoor weather factors; t (T) b Setting a temperature threshold value for starting and cooling the wet curtain pump; t (T) h And setting a wet curtain pump starting energy consumption benefit threshold.
Through the first step to the fourth step, the controller controls the start or stop of the fan, the start and stop of the water pump 12, the opening and closing of the top window 26, and the ventilation quantity of the variable frequency fan is adjusted according to the fresh air quantity of the outdoor air inlet, so that the temperature and the humidity in the greenhouse 1 are adjusted, and the indoor temperature and the humidity reach the set requirements.
The wet curtain of the device adopts a box type design and is arranged at a position which is a certain distance away from the greenhouse 1, the wet curtain is connected with the bottom of the greenhouse 1 isolated from the grid plate 25 through the air duct 16, and the bottom of the greenhouse 1 is provided with the ventilation pipe 18 and the variable frequency fan. The external dry and hot air is cooled by a wet curtain under the negative pressure of a variable frequency fan to become wet and cold air, the wet and cold air passes through an air duct 16 and the variable frequency fan, then enters the scientific research greenhouse 1 in a positive pressure mode, and cools the test area of the scientific research greenhouse 1 through a ventilation pipe 18, an air outlet and a grid plate 25, and the cooled wet and cold air is changed into hot air to be discharged outdoors through a top window 26 of the scientific research greenhouse 1. By the separate arrangement of the wet curtain and the greenhouse 1, the sun-shading effect of the box-type wet curtain on the greenhouse 1 is solved. The separate arrangement of the wet curtain from the greenhouse 1 is facilitated by the box-type design of the wet curtain. The upper space and the lower space of the greenhouse 1 are isolated through the grid plate 25, and the ventilation pipe 18 and the variable frequency fan 17 are arranged at the lower part, so that the influence of the fan on shading of the greenhouse 1 by the traditional wet curtain fan cooling device is eliminated, meanwhile, the effective use area of the greenhouse 1 is improved through the design of bottom positive pressure type air supply, and the inhalation of crop pathogens and insect sources of the greenhouse 1 from gaps such as windows, doors and glass of the greenhouse 1 is reduced. The bottom of the greenhouse 1 is provided with an air inlet, the top is provided with an air outlet, the natural lifting force of hot air is effectively utilized in the vertical convection of cold air and hot air, the ventilation efficiency is improved, and the cooling energy consumption is reduced. The wet curtain facade covers the diversion net 4, and the wet curtain water tank adopts a large cornice design, so that the wet curtain is effectively prevented from dripping and leaking.
In the control method, feedforward PID control is adopted, and the controller calculates the expected temperature in the greenhouse 1 for feedforward according to the outdoor dry-bulb air temperature, the radiation intensity, the wind speed and the influence value of window opening comparison on the indoor temperature, so that timely conversion between natural ventilation cooling and wet curtain fan cooling is accurately judged, and the accuracy of temperature control and the stability of equipment operation are improved. After the device starts to operate, the fan adopts variable frequency control to adjust the fresh air quantity entering the greenhouse 1, so that the aim of accurately adjusting and controlling the indoor temperature of the greenhouse 1 is fulfilled, and the defect that the temperature in the greenhouse 1 is severely changed due to the starting and stopping of the traditional fan is overcome. The temperature reduction efficiency of the operation of the wet curtain water pump 12 is measured by comparing the difference value of the dry bulb temperature and the wet bulb temperature outside the greenhouse with the difference value of the dry bulb temperature and the wet bulb temperature inside the greenhouse, and the energy efficiency of the operation of the wet curtain water pump 12 is improved according to the setting of the threshold value. The wet curtain cooling device for the scientific research greenhouse can be widely applied to the scientific research greenhouse and the small test greenhouse with high environmental control precision and good cooling and pest control effects.
Claims (5)
1. The control method of the wet curtain cooling device of the scientific research greenhouse is characterized by comprising the following steps of:
firstly, setting a temperature threshold T for starting a variable frequency fan on a controller f Temperature threshold T for starting water pump b Energy consumption efficiency threshold T for starting water pump h The method comprises the steps of carrying out a first treatment on the surface of the The controller receives information transmitted by the radiation sensor, the wind speed sensor, the indoor dry bulb temperature sensor, the indoor wet bulb temperature sensor, the outdoor dry bulb temperature sensor and the outdoor wet bulb temperature sensor in real time;
step two, the information detected by the outdoor dry bulb temperature sensor, the wind speed sensor and the radiation sensor is transmitted to a controller, and the controller calculates the indoor expected air temperature and the indoor expected air temperature T according to the received outdoor air temperature, the radiation intensity, the influence value of the wind speed on the indoor temperature and under the condition of natural ventilation with windows q The calculation is as follows:
T q ＝T o +T r +T w +T v +T s
T O ＝k 1 ×(t 1 -t 0 )
T r ＝k 2 ×(r 1 -r 0 )
T w ＝k 3 ×(s-s 0 )
T v ＝k 4 ×(v-v 0 )
t in q Is the indoor expected air temperature; t (T) S Is a set standard temperature; t (T) o The influence value of the outdoor temperature on the indoor temperature is obtained; t (T) r Is the influence value of solar radiation intensity on indoor temperature; t (T) w The influence value of the outdoor wind speed on the indoor temperature is obtained; t (T) v The influence of natural window opening of a greenhouse on the indoor temperature is compared; k (k) 1 To calculate the influence coefficient of outdoor temperature to the influence value of indoor temperature, t 1 T is the current outdoor temperature 0 For a specified outdoor temperature reference value k 2 To calculate the influence coefficient of the temperature influence value in the solar radiation intensity room, r 1 R is the current outdoor radiation intensity 0 A reference value for a specified outdoor radiation intensity; k (k) 3 In order to calculate the influence coefficient of the influence value of the outdoor wind speed and the indoor temperature, s is the current outdoor wind speed, s 0 A reference value for a specified outdoor wind speed; k (k) 4 In order to calculate the influence coefficient of the influence value of the greenhouse windowing ratio on the indoor temperature, v is the current greenhouse windowing ratio, v 0 A reference value for the specified greenhouse window ratio;
if the indoor current expected air temperature t q (n) the difference between the indoor temperature reduction target temperature T (n) and the set temperature is higher than the temperature threshold T for starting the fan f I.e. (t) q (n)-t(n))≥T f The controller controls the top window to be opened, and the variable-frequency fan starts to work; otherwise, the controller controls the top window to stop working;
step three, when the controller controls the variable frequency fan to start working, the rotational speed of the variable frequency fan is controlled and regulated by the PID for the variable frequency fan, and the ventilation of the greenhouse is regulated;
t (n) is the target temperature of indoor cooling, t 3 (n) is implemented by using the current indoor dry bulb temperature sensorThe feedback air temperature measured by the air temperature measuring device is characterized in that the output frequency f (x) of a frequency converter of the frequency conversion fan is formed by t (n) and t 3 (n) determining, if t 3 (n) is not less than t (n), the output frequency f (x) of the frequency converter is increased, the rotating speed of the frequency conversion fan is increased until the indoor dry bulb temperature sensor actually detects the air temperature t 3 (n) is equal to the set indoor target temperature t (n); conversely, if t 3 (n) < t (n), the output frequency f (x) of the frequency converter is reduced, the rotating speed of the fan is reduced until the indoor dry bulb temperature sensor actually detects the air temperature t 3 (n) is equal to the set indoor target temperature t (n);
and fourthly, detecting signals of the indoor dry bulb temperature sensor, the indoor wet bulb temperature sensor, the outdoor dry bulb temperature sensor and the outdoor wet bulb temperature sensor once every m minutes, transmitting the detected signals to a controller, and controlling the water pump to start and stop according to the detected signals by the controller, wherein the calculation is as follows:
wherein P is the starting and stopping state of the water pump, 1 is the starting state, and 0 is the stopping state; t is t 4 (n) is a temperature value detected by an indoor wet bulb temperature sensor; t is t 3 (n) is a temperature value detected by an indoor dry bulb temperature sensor; t is t 2 (n) is a temperature value detected by an outdoor wet bulb temperature sensor; t is t 1 (n) is a temperature value detected by an outdoor dry bulb temperature sensor; t (n) is a set greenhouse cooling target temperature; t is t q (n) is the current greenhouse expected temperature calculated by the controller according to the outdoor weather factors; t (T) b Setting a temperature threshold value for starting and cooling the water pump; t (T) h Setting an energy consumption benefit threshold value of water pump operation;
the method comprises the steps of firstly to fourthly, controlling the starting or stopping of a variable frequency fan, the starting and stopping of a water pump and the opening and closing of a top window in a device by a controller, and adjusting the ventilation quantity of the variable frequency fan according to the calculated fresh air quantity outdoors, so as to adjust the temperature and the humidity in a greenhouse and enable the indoor temperature and the humidity to meet the set requirements;
the cooling device comprises a radiation sensor for detecting an outdoor solar radiation value, a wind speed sensor for detecting an outdoor wind speed, a flow guide net, a sealing cover, an outdoor dry bulb temperature sensor for detecting an outdoor temperature, an outdoor wet bulb temperature sensor for detecting an outdoor air temperature, a water pump, a wet curtain pool, a water return tank, an air duct, a variable frequency fan, a ventilation pipe, an indoor dry bulb temperature sensor for detecting an indoor temperature, an indoor wet bulb temperature sensor for detecting an indoor air temperature, plants, grid plates, a top window motor and a box-type wet curtain; a grid plate is arranged in the greenhouse to divide the greenhouse into an upper part and a lower part; placing plants on the grid plate; a top window is arranged at the top of the greenhouse and is driven to open and close by a top window motor; the lower part of the greenhouse is provided with a plurality of ventilation pipes, the ventilation pipes are connected with one end of the air duct, a variable frequency fan is arranged at the connection part, a plurality of air outlets are arranged on the ventilation pipes, and the other end of the air duct is connected with the air outlets of the box-type wet curtain; the inner side and the outer side of the box-type wet curtain are covered with a diversion net; a water return tank is arranged below the box-type wet curtain and is communicated with the wet curtain pool, and a water pump is arranged in the wet curtain pool; pumping water in the wet curtain pool by a water pump, and injecting the water into the guide net; the top end of the box-type wet curtain is provided with a sealing cover, and the radiation sensor, the wind speed sensor, the indoor dry bulb temperature sensor, the indoor wet bulb temperature sensor, the outdoor dry bulb temperature sensor, the outdoor wet bulb temperature sensor, the water pump, the variable frequency fan and the top window motor are all connected with the controller;
the grid plate is made of glass fiber reinforced plastic or galvanized steel;
the box type wet curtain is a box body formed by combining four identical wet curtain blocks, the middle cavity of the box body is an air channel, the periphery of the box body is provided with air inlets, the upper part of the box type wet curtain is provided with a sealing cover, and the box type wet curtain air outlet is positioned between the wet curtain box body and a wet curtain pool;
the mesh of the diversion net is of a diamond structure, and the length of the mesh is 5 mm-15 mm; the diversion net is woven by synthetic fiber net wires, and the diameter of the synthetic fiber net wires is 0.1 mm-0.6 mm;
the water return groove is of a large cornice structure, and the cornice width is 20-50 mm.
2. The control method of the scientific greenhouse wet curtain cooling device according to claim 1, wherein the linear distance between the ground center position of the box-type wet curtain and the air inlet at the bottom of the greenhouse is 2-6 meters.
3. The control method of the scientific greenhouse wet curtain cooling device according to claim 1, wherein the radiation sensor and the wind speed sensor are fixed right above a greenhouse gutter; the indoor dry bulb temperature sensor and the indoor wet bulb temperature sensor are arranged in the center of the greenhouse; the outdoor dry bulb temperature sensor and the outdoor wet bulb temperature sensor are arranged on the outer edge of the sealing cover.
4. The control method of the cooling device for the wet curtain of the scientific research greenhouse according to claim 1, wherein the air inlets around the box-type wet curtain are provided with insect nets.
5. The method for controlling a wet curtain cooling device of a scientific greenhouse according to claim 1, wherein the top window is covered with a top window insect-proof net.
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| PCT/CN2019/099154 WO2020143223A1 (en) | 2019-01-08 | 2019-08-03 | Scientific research greenhouse wet curtain cooling device and control method |
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| CN110332655B (en) * | 2019-06-27 | 2020-10-23 | 武汉裕大华纺织服装集团有限公司 | Intelligent temperature and humidity control system for spinning workshop |
| CN112096134B (en) * | 2020-08-28 | 2022-04-05 | 广西民族大学 | Low-energy-consumption assembly type component maintenance shed |
| CN115517112B (en) * | 2022-10-19 | 2023-11-21 | 北京中农富通园艺有限公司 | Comprehensive facility integrating greenhouse cooling function and aquaculture function |
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