CN113396756A - Automatic temperature control device and method for greenhouse - Google Patents

Automatic temperature control device and method for greenhouse Download PDF

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Publication number
CN113396756A
CN113396756A CN202110817152.0A CN202110817152A CN113396756A CN 113396756 A CN113396756 A CN 113396756A CN 202110817152 A CN202110817152 A CN 202110817152A CN 113396756 A CN113396756 A CN 113396756A
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greenhouse
temperature
air
fan
soil
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CN113396756B (en
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石翔
吴智巍
鄢志丹
李毅
王福民
王文兵
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China University of Petroleum East China
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China University of Petroleum East China
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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
    • A01G9/24—Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
    • A01G9/243—Collecting solar energy
    • 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
    • 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

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Greenhouses (AREA)

Abstract

The invention relates to a greenhouse automatic temperature control device and a method, wherein the device comprises a plurality of temperature control units, and each temperature control unit comprises: a control unit; the temperature detection unit is communicated with the control unit and comprises a first temperature detection unit arranged at the top in the greenhouse shed, a second temperature detection unit arranged in the middle in the greenhouse shed and a third temperature detection unit arranged in soil in the greenhouse shed; the ventilation pipeline comprises a vertical part and a horizontal part, wherein the vertical part is arranged in the side wall of the greenhouse or on a rear side supporting body in the greenhouse, the horizontal part is transversely buried under soil, the upper port of the vertical part is an inlet of the ventilation pipeline, the lower port of the vertical part is communicated with the first port of the horizontal part, and the second port of the horizontal part is an outlet of the ventilation pipeline; the fan is electrically connected with the control unit and arranged at the inlet of the ventilating duct; the ditch is longitudinally penetrated inside the greenhouse and is positioned at the outlet of the ventilating duct. The greenhouse disclosed by the invention has the advantages of high heat utilization efficiency and low energy consumption.

Description

Automatic temperature control device and method for greenhouse
Technical Field
The invention belongs to the technical field of energy conservation and environmental protection, relates to a greenhouse technology, and particularly relates to an automatic temperature control device and method for a greenhouse.
Background
Greenhouse refers to the way of manual intervention to adjust the temperature, humidity, illumination, moisture, nutrients and CO in a designated area2And various environmental factors are comprehensively regulated and controlled, so that the method is suitable for the requirements of the cultivated crops.
The main problems of the existing greenhouse are as follows:
(1) in winter, manual heating is needed, and energy consumption is high.
(2) Because the circulation of air is not enough in the big-arch shelter, the heat is gathered at the big-arch shelter top, and the ground and the soil temperature at crops place are lower relatively, lead to the heat utilization efficiency low, have a large amount of heat extravagant.
(3) The temperature inside the greenhouse is higher than that outside the greenhouse on two sides of the greenhouse top film, so that water in hot air in the greenhouse is liquefied into water drops when meeting cold and is attached to the inner side of the film, the water drops are easy to fall on crops to frost, and the growth of the crops is influenced.
(4) Insufficient air circulation in the shed leads to air tightness, is not beneficial to the growth of crops, and can influence the health of workers in the shed.
Disclosure of Invention
The invention provides an automatic temperature control device and method for a greenhouse, aiming at the problems of low heat utilization rate, high artificial heating energy consumption and the like of the existing greenhouse, and can solve the problems of low heat utilization efficiency, high heating energy consumption in winter and the like caused by insufficient air circulation in the greenhouse.
In order to achieve the above object, the present invention provides an automatic temperature control device for a greenhouse, comprising a plurality of temperature control units, each temperature control unit comprising:
a control unit;
the temperature detection unit is communicated with the control unit and comprises a first temperature detection unit arranged at the top in the greenhouse shed, a second temperature detection unit arranged in the middle in the greenhouse shed and a third temperature detection unit arranged in soil in the greenhouse shed;
the ventilating duct comprises a vertical part and a horizontal part, wherein the vertical part is arranged in the side wall of the greenhouse or on a rear support body in the greenhouse and is made of a heat insulation material, the horizontal part is transversely buried under soil and is made of a heat dissipation material, the upper port of the vertical part is an inlet of the ventilating duct, the lower port of the vertical part is communicated with the first port of the horizontal part, and the second port of the horizontal part is an outlet of the ventilating duct;
the fan is electrically connected with the control unit and arranged at the inlet of the ventilating duct;
the channel longitudinally penetrates through the interior of the greenhouse and is positioned at the outlet of the ventilating duct;
preferably, the control unit comprises a processor and a controller, wherein the processor is respectively communicated with the first temperature detection unit, the second temperature detection unit and the third temperature detection unit, the controller is communicated with the processor, and the controller is electrically connected with the fan.
Preferably, the processor is provided with a set temperature difference threshold value n, and the acquired top air temperature of the greenhouse is recorded as THAnd the middle air temperature is denoted as TMAnd the soil temperature is denoted as TLWhen the processor judges TH-TL>When n is needed, the processor sends a control signal to the controller, the controller controls the fan to be started, and when the processor judges TH-TLWhen the number n is less than or equal to n, the processor sends a control signal to the controller, and the controller controls the fan to be closed.
Preferably, the rotating speed v of the fan is controlled by the top air temperature T of the greenhouseHTemperature T of soilLDifference and top air temperature T of greenhouseHTemperature T of air in the middleMThe difference determines that the rotating speed v of the fan is expressed as:
v＝α(TH-TL)+β(TH-TM) (1)
in the formula, alpha represents the rotation speed coefficient of a fan for the temperature difference between the air at the top of the greenhouse and the soil, beta represents the rotation speed coefficient of the temperature difference between the air at the top of the greenhouse and the air at the middle of the greenhouse, and alpha and beta are determined by the space size of the greenhouse and the temperature required by the growth of crops planted in the greenhouse.
In order to achieve the purpose, the invention also provides a greenhouse braking temperature control method, which adopts the greenhouse automatic temperature control device and comprises the following specific steps:
a first temperature detection unit in each automatic temperature control unit collects the air temperature at the top in the greenhouse, a second temperature detection unit collects the air temperature at the middle in the greenhouse, and a third temperature detection unit collects the soil temperature in the greenhouse and uploads the soil temperature to a processor through a communication network;
setting a temperature difference threshold value n in the processor, and judging the top air temperature T through the processorHTemperature T of soilLWhether the difference is greater than a set temperature difference threshold value n, if TH-TL>n, the processor sends a control signal to the controller, the controller controls the fan to be started, the fan guides hot air on the greenhouse top into the soil through the ventilation pipeline and discharges the hot air from the ditch to form air circulation in the greenhouse, and if T is detected, the air circulation in the greenhouse is formedH-TLWhen the number n is less than or equal to n, the processor sends a control signal to the controller, and the controller controls the fan to be closed.
Compared with the prior art, the invention has the advantages and positive effects that:
according to the invention, the top air temperature, the middle air temperature and the soil temperature of the greenhouse are collected, the air temperature, the middle air temperature and the soil temperature are processed by the control unit and then compared with the set threshold value, a corresponding control signal is sent to the controller according to the comparison result, the rotating speed of the fan is controlled by the controller, hot air on the greenhouse top is introduced into the soil through the ventilation pipeline, the soil temperature is raised, the temperature of the greenhouse top is reduced, and then the hot air is discharged from the ditch. The invention does not need manual heating equipment such as a heater, an air conditioner and the like, only adopts air circulation in the shed, fully utilizes natural solar energy, guides the human air accumulated at the top in the shed due to sunlight irradiation into the soil at the bottom in the shed, keeps the temperature of the air and the soil in the shed, and solves the problems of low heat utilization efficiency, high heating energy consumption in winter and the like caused by insufficient air circulation in the shed.
Drawings
Fig. 1 is a schematic view of an installation structure of an automatic temperature control device of a greenhouse according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure view of a greenhouse according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;
FIG. 5 is a schematic view of the air thermal cycle inside the greenhouse of the embodiment of the present invention;
FIG. 6 is a temperature comparison graph of a fan system at a temperature measuring position at the top of a greenhouse in 24 hours before and after operation according to an embodiment of the invention;
fig. 7 is a schematic diagram of the soil temperature recorded in the greenhouse for 24 hours according to the embodiment of the invention.
In the figure, 1, a control unit, 101, a processor, 102, a controller, 2, a first temperature detection unit, 3, a second temperature detection unit, 4, a third temperature detection unit, 5, a ventilation duct, 501, a vertical part, 502, a horizontal part, 6, a fan, 7, a ditch, 8, a greenhouse, 801, a greenhouse side wall, 802 and a greenhouse door.
Detailed Description
The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "front", "rear", and the like indicate orientations or positional relationships based on positional relationships shown in the drawings, which are merely for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 1 to 5, the present embodiment provides an automatic temperature control device for a greenhouse, including 4 temperature control units, each temperature control unit includes:
a control unit 1;
the temperature detection unit communicated with the control unit 1 comprises a first temperature detection unit 2 arranged at the top in the greenhouse 8, a second temperature detection unit 3 arranged at the middle in the greenhouse 8 and a third temperature detection unit 4 arranged at the soil in the greenhouse 8;
the ventilating duct 5 comprises a vertical part 501 which is arranged in the side wall 801 of the greenhouse and is made of heat insulation materials and a horizontal part 502 which is transversely buried under soil and is made of heat dissipation materials, wherein the upper port of the vertical part 501 is an inlet of the ventilating duct, the lower port of the vertical part 501 is communicated with the first port of the horizontal part 502, and the second port of the horizontal part 502 is an outlet of the ventilating duct;
the fan 6 is electrically connected with the control unit 1 and is arranged at the inlet of the ventilating duct;
and the ditch 7 longitudinally penetrates through the inside of the greenhouse 8 and is positioned at the outlet of the ventilating pipeline.
Specifically, with continued reference to fig. 1 and 2, the control unit 1 includes a processor 101 in communication with the first temperature detection unit 2, the second temperature detection unit 3, and the third temperature detection unit 4, respectively, and a controller 102 in communication with the processor 101, wherein the controller 102 is electrically connected to the fan 6. It should be noted that, in this embodiment, three sets of temperatures collected by the three temperature detection units are uploaded to the processor through the communication network.
Specifically, the processor is provided with a set temperature difference threshold value n, and the acquired top air temperature of the greenhouse is recorded as THAnd the middle air temperature is denoted as TMAnd the soil temperature is denoted as TLWhen the processor judges TH-TL>When n is needed, the processor sends a control signal to the controller, the controller controls the fan to be started, and when the processor judges TH-TLWhen the number n is less than or equal to n, the processor sends a control signal to the controller, and the controller controls the fan to be closed.
In particular, the rotating speed v of the fan is controlled by the greenhouseTop air temperature THTemperature T of soilLDifference and top air temperature T of greenhouseHTemperature T of air in the middleMThe difference determines that the rotating speed v of the fan is expressed as:
v＝α(TH-TL)+β(TH-TM) (1)
in the formula, alpha represents the rotation speed coefficient of a fan for the temperature difference between the air at the top of the greenhouse and the soil, beta represents the rotation speed coefficient of the temperature difference between the air at the top of the greenhouse and the air at the middle of the greenhouse, and alpha and beta are determined by the space size of the greenhouse and the temperature required by the growth of crops planted in the greenhouse.
It should be noted that the number of the automatic temperature control units in this embodiment is not limited to four, and is specifically determined according to the space size of the greenhouse. If the size of the greenhouse space is small, two or three greenhouse spaces can be arranged, and if the size of the greenhouse space is large, five, six or even more greenhouse spaces can be arranged. The distance between two adjacent automatic temperature control units is 1-2 meters, in a specific embodiment, the distance between two adjacent automatic temperature control units is 1.5 meters, but not limited to 1.5 meters, and can be 1 meter, 1.2 meters, 1.8 meters and 2 meters according to the temperature required by the growth of crops.
The working principle of the automatic temperature control device for the greenhouse is as follows:
when the automatic temperature control device for the greenhouse is operated, each automatic temperature control unit acquires the greenhouse top temperature, the greenhouse middle temperature and the soil temperature through the three temperature detection units and uploads the greenhouse top temperature, the greenhouse middle temperature and the soil temperature to the processor through the communication network, the processor sends corresponding control signals to the controller after processing the temperature data, and the controller controls the operation state (opening or closing) of the fan.
When controlling the temperature through the automatic temperature control device for the greenhouse, continuously referring to fig. 5, the air circulation process in the greenhouse is as follows:
the collected greenhouse top temperature, greenhouse middle temperature and soil temperature are processed by the processor and then compared with a set temperature difference threshold value, and when the processor judges the top air temperature TH-hollow in the middleTemperature T of gasL>When the temperature difference threshold value n is set, the processor sends a control signal to the controller, the controller controls the fan to be started, and when the processor judges TH-TLWhen the number n is less than or equal to n, the processor sends a control signal to the controller, and the controller controls the fan to be closed. After the controller controls the fan to be opened, the rotating speed of the fan is controlled through the controller, hot air on the greenhouse top is guided into soil through the ventilation pipeline, the soil temperature is improved, the temperature of the greenhouse top is reduced, and then the hot air is discharged from a ditch.
Adopt above-mentioned warmhouse booth automatic temperature control device of this embodiment's warmhouse booth, need not the heating installation, artifical heating equipment such as air conditioner, through above-mentioned warmhouse booth automatic temperature control device of this embodiment, adopt the air cycle in the canopy, make full use of natural solar energy, will because sunshine shines in the soil of the leading-in canopy bottom in the people's air of top save in the canopy, keep air and soil temperature in the canopy, the heat utilization efficiency who leads to because of air cycle is not enough in having solved the canopy is not high, winter heating energy consumption scheduling problem.
In another embodiment, different from the above embodiments, in this embodiment, the ventilation duct is installed on a rear support in the greenhouse body, and in this embodiment, the rear support is a pillar.
The invention also provides a greenhouse automatic temperature control method, which adopts the greenhouse automatic temperature control device of the embodiment and comprises the following specific steps:
s1, a first temperature detection unit in each automatic temperature control unit collects the air temperature at the top in the greenhouse, a second temperature detection unit collects the air temperature at the middle in the greenhouse, and a third temperature detection unit collects the soil temperature in the greenhouse and uploads the soil temperature to a processor through a communication network;
s2, setting a set temperature difference threshold n in the processor, and judging the top air temperature T through the processorHTemperature T of soilLWhether the difference is greater than a set temperature difference threshold value n, if TH-TL>When n is needed, the processor sends a control signal to the controller, the controller controls the fan to be started, and the fan ventilates hot air on the greenhouse topThe pipeline is introduced into the soil and discharged from the ditch to form air circulation in the shed, if T isH-TLWhen the number n is less than or equal to n, the processor sends a control signal to the controller, and the controller controls the fan to be closed.
Specifically, the rotating speed v of the fan is controlled by the top air temperature T of the greenhouseHTemperature T of soilLDifference and top air temperature T of greenhouseHTemperature T of air in the middleMThe difference determines that the rotating speed v of the fan is expressed as:
v＝α(TH-TL)+β(TH-TM) (1)
in the formula, alpha represents the rotation speed coefficient of a fan for the temperature difference between the air at the top of the greenhouse and the soil, beta represents the rotation speed coefficient of the temperature difference between the air at the top of the greenhouse and the air at the middle of the greenhouse, and alpha and beta are determined by the space size of the greenhouse and the temperature required by the growth of crops planted in the greenhouse.
The control method of the invention leads the hot air on the greenhouse top into the soil through the ventilation pipeline, raises the soil temperature and lowers the temperature of the greenhouse top, and then the hot air is discharged from the ditch.
In order to prove the effectiveness of the automatic temperature control device and method for the greenhouse of the embodiment, the temperature data of the greenhouse are recorded through the embodiment. Fig. 6 and 7 show temperature data recorded by the automatic temperature control device for the greenhouse of the embodiment of the invention in 12 months, 10 days and 11 days in 2020, the location is in the town of Langya in the new west coast of Qingdao City, and no artificial heating is provided; wherein, the fan in the invention is turned off in 12 months and 10 days, the obtained temperature data is shown as a solid line in figure 6, and the maximum temperature of the top of the greenhouse in 24 hours is 27 ℃; 12 months and 11 days, the fan is started, the obtained temperature data is shown as a dotted line in fig. 6, and the maximum temperature of the top of the greenhouse in 24 hours is 18 ℃; according to the temperature record, the temperature at the top of the greenhouse is remarkably reduced, the temperature difference between the inside and the outside is reduced, and the formation of condensed water is favorably reduced. The greenhouse soil temperature in 12 months and 11 days is shown in figure 7, and the temperature is always kept at about 15 ℃ according to the record, so that the production requirement of crops is met. In conclusion, the automatic temperature control device for the greenhouse can reduce the temperature of the top and the middle of the greenhouse by only utilizing the air thermal cycle in the greenhouse, and obviously solves the problems of low heat utilization efficiency, high heating energy consumption in winter and the like in the conventional greenhouse.
The above-described embodiments are intended to illustrate rather than to limit the invention, and any modifications and variations of the present invention are possible within the spirit and scope of the claims.

Claims (6)

1. The utility model provides a warmhouse booth automatic temperature control device which characterized in that, includes a plurality of accuse temperature units, and every accuse temperature unit all includes:
a control unit (1);
the temperature detection unit is communicated with the control unit (1) and comprises a first temperature detection unit (2) arranged at the top in the greenhouse (8), a second temperature detection unit (3) arranged at the middle part in the greenhouse (8) and a third temperature detection unit (4) arranged at the soil in the greenhouse (8);
the ventilation pipeline (5) comprises a vertical part (501) which is arranged in the side wall (801) of the greenhouse or on a rear support body in the greenhouse and is made of a heat insulation material and a horizontal part (502) which is transversely buried under soil and is made of a heat dissipation material, the upper end opening of the vertical part (501) is a ventilation pipeline inlet, the lower end opening of the vertical part (501) is communicated with the first end opening of the horizontal part (502), and the second end opening of the horizontal part (502) is a ventilation pipeline outlet;
the fan (6) is electrically connected with the control unit (1) and is arranged at the inlet of the ventilation pipeline;
and the ditch (7) longitudinally penetrates through the inside of the greenhouse (8) and is positioned at the outlet of the ventilation pipeline (5).
2. The automatic temperature control device for the greenhouse of claim 1, wherein the control unit (1) comprises a processor (101) and a controller (102), the processor (101) is in communication with the first temperature detection unit (2), the second temperature detection unit (3) and the third temperature detection unit (4) respectively, the controller (102) is in communication with the processor (101), and the controller (102) is electrically connected with the fan (6).
3. The greenhouse automatic temperature control device as claimed in claim 2, wherein the processor is provided with a set temperature difference threshold n, and the acquired current top air temperature of the greenhouse is recorded as THAnd the middle air temperature is denoted as TMAnd the soil temperature is denoted as TLWhen the processor judges TH-TL>When n is needed, the processor sends a control signal to the controller, the controller controls the fan to be started, and when the processor judges TH-TLWhen the number n is less than or equal to n, the processor sends a control signal to the controller, and the controller controls the fan to be closed.
4. The automatic temperature control device for greenhouse as claimed in claim 3, wherein the rotation speed v of the fan is determined by the temperature T of the top air of the greenhouseHTemperature T of soilLDifference and top air temperature T of greenhouseHTemperature T of air in the middleMThe difference determines that the rotating speed v of the fan is expressed as:
v＝α(TH-TL)+β(TH-TM) (1)
in the formula, alpha represents the rotation speed coefficient of a fan for the temperature difference between the air at the top of the greenhouse and the soil, beta represents the rotation speed coefficient of the temperature difference between the air at the top of the greenhouse and the air at the middle of the greenhouse, and alpha and beta are determined by the space size of the greenhouse and the temperature required by the growth of crops planted in the greenhouse.
5. A greenhouse braking temperature control method is characterized in that the greenhouse automatic temperature control device in any one of embodiments 1 to 4 is adopted, and the method comprises the following specific steps:
a first temperature detection unit in each automatic temperature control unit collects the air temperature at the top in the greenhouse, a second temperature detection unit collects the air temperature at the middle in the greenhouse, and a third temperature detection unit collects the soil temperature in the greenhouse and uploads the soil temperature to a processor through a communication network;
setting a set temperature difference threshold n in the processor, and judging through the processorAir temperature T at the top of the towerHTemperature T of soilLWhether the difference is greater than a set temperature difference threshold value n, if TH-TL>n, the processor sends a control signal to the controller, the controller controls the fan to be started, the fan guides hot air on the greenhouse top into the soil through the ventilation pipeline and discharges the hot air from the ditch to form air circulation in the greenhouse, and if T is detected, the air circulation in the greenhouse is formedH-TLWhen the number n is less than or equal to n, the processor sends a control signal to the controller, and the controller controls the fan to be closed.
6. The method for controlling the temperature of the greenhouse shed as claimed in claim 5, wherein the rotating speed v of the fan is determined by the temperature T of the top air of the greenhouse shedHTemperature T of soilLDifference and top air temperature T of greenhouseHTemperature T of air in the middleMThe difference determines that the rotating speed v of the fan is expressed as:
v＝α(TH-TL)+β(TH-TM) (1)
in the formula, alpha represents the rotation speed coefficient of a fan for the temperature difference between the air at the top of the greenhouse and the soil, beta represents the rotation speed coefficient of the temperature difference between the air at the top of the greenhouse and the air at the middle of the greenhouse, and alpha and beta are determined by the space size of the greenhouse and the temperature required by the growth of crops planted in the greenhouse.
CN202110817152.0A 2021-07-20 2021-07-20 Automatic temperature control device and method for greenhouse Active CN113396756B (en)

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Cited By (1)

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CN109792912A (en) * 2019-01-29 2019-05-24 江苏农林职业技术学院 A kind of phjytotron internal air circulation system and its control method
CN111567275A (en) * 2020-05-19 2020-08-25 济源职业技术学院 Greenhouse temperature sensing and control system and method based on Internet of things

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Publication number Priority date Publication date Assignee Title
KR101113107B1 (en) * 2011-05-06 2012-03-13 박철수 Roof window control method for green house
CN107906626A (en) * 2017-10-23 2018-04-13 Tcl空调器(中山)有限公司 The benefit wind method, apparatus and computer-readable recording medium of air-conditioner outdoor unit
CN108800495A (en) * 2018-09-18 2018-11-13 黄超 A kind of interior high and low position Air Temperature Difference balancer
CN109792912A (en) * 2019-01-29 2019-05-24 江苏农林职业技术学院 A kind of phjytotron internal air circulation system and its control method
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CN115454167B (en) * 2022-09-26 2024-02-02 中国科学院西北生态环境资源研究院 Undisturbed soil temperature in-situ control device

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