CN111309072A - Sunlight greenhouse temperature control method based on surface cooler-fan - Google Patents

Sunlight greenhouse temperature control method based on surface cooler-fan Download PDF

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Publication number
CN111309072A
CN111309072A CN202010119495.5A CN202010119495A CN111309072A CN 111309072 A CN111309072 A CN 111309072A CN 202010119495 A CN202010119495 A CN 202010119495A CN 111309072 A CN111309072 A CN 111309072A
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temperature
heat
stage
greenhouse
release
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CN111309072B (en
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宋卫堂
何雪颖
李明
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China Agricultural University
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China Agricultural University
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    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00Control of temperature
    • G05D23/19Control of temperature characterised by the use of electric means
    • G05D23/20Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G9/00Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
    • A01G9/24Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
    • A01G9/245Conduits for heating by means of liquids, e.g. used as frame members or for soil heating
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/25Greenhouse technology, e.g. cooling systems therefor
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/14Measures for saving energy, e.g. in green houses

Abstract

The invention discloses a sunlight greenhouse temperature control method based on a surface cooler-fan, which belongs to the field of agricultural facilities; wherein the first stage is a heat collection stage in the morning, the second stage is a heat collection stage in the afternoon, the third stage is a stable migration stage in the first midnight, and the fourth stage is a function maintenance stage in the second midnight; and is provided with three auxiliary stages which are respectively: a fifth stage of accelerating migration in the evening; the sixth stage is a photosynthetic awakening stage in the early morning; the seventh up-down synchronization stage is performed at the beginning of the first stage. The invention not only divides the heat collection into two time periods in the daytime, thereby reducing unnecessary power consumption; meanwhile, the night is divided into two time periods, so that the total heat load at night is reduced; and three temperature control strategies according with the plant growth rule are added, so that the timely variable-temperature management control according with the plant growth rule is realized, and the efficiency and the energy are higher.

Description

Sunlight greenhouse temperature control method based on surface cooler-fan
Technical Field
The invention belongs to the technical field of agricultural facilities, and particularly relates to a sunlight greenhouse temperature control method based on a surface cooler-fan.
Background
At present, the management and control method of the temperature environment of the sunlight greenhouse with the active heat collecting and releasing system is relatively extensive and simple, and generally the heat collecting and releasing system is controlled to be switched on and off according to the indoor temperature or time, so that heat is collected in the daytime, and then heat is released at night to improve the lowest temperature of the sunlight greenhouse.
A surface cooler-fan active heat collection and release system is a method for collecting waste heat in air, whether the system is operated or not is only related to temperature and not directly related to the intensity of sunlight, and heat can be collected even in cloudy days.
According to the current temperature management control strategy, even under different weather conditions such as sunny days, cloudy days and the like, the management control method is also unchanged, so that the efficient utilization of energy is not facilitated; meanwhile, the control method for maintaining the same lowest temperature at night can cause the temperature of the greenhouse in the first half night to be relatively low, which is not beneficial to the transfer of the photosynthetic products by the plants (because the transfer of the photosynthetic products needs relatively higher temperature), but the temperature in the second half night is relatively higher, which enhances the respiratory consumption of the plants, leads to the reduction of the accumulation amount of the photosynthetic products, and is not beneficial to high yield and high quality. Therefore, the existing temperature environment management control method does not meet the requirement rule of plant growth on the environmental temperature, and even does not meet the requirement of sustainable development of modern agriculture.
Therefore, an efficient control method for regulating and controlling the temperature environment of the sunlight greenhouse is urgently needed, and a better temperature condition is provided for plant growth.
Disclosure of Invention
Aiming at the problems in the background art, the invention provides a sunlight greenhouse temperature control method based on a surface cooler-fan, which is characterized by comprising the following steps:
the first stage, the heat collecting stage in the morning; when the temperature T of the greenhouseqHigher than the low-temperature heat collection set air temperature Tjk1And water temperature difference Δ TsqTemperature difference T of more than or equal to low-temperature heat collecting water gasjc1When the heat collecting and releasing system is used, the control system starts a first heat collecting and releasing group of the active heat collecting and releasing system to collect heat; when the temperature T of the greenhouseqHigher than the high-temperature heat collection set air temperature Tjk2And water temperature difference Δ TsqTemperature difference T of high-temperature heat collecting water and gas is more than or equal tojc2When the heat collecting and releasing unit is started, the control system starts the second heat collecting and releasing unit to collect heat together with the first heat collecting and releasing unit; when the temperature T of the greenhouseqHigher than the upper limit of the suitable temperature T of the cropssfkIn time, open the sunlight greenhouseA tuyere; water-gas temperature difference delta TsqTaking the absolute value of the difference between the water temperature in the heat preservation reservoir and the air temperature;
the second stage, the afternoon heat collection stage; when the temperature T of the greenhouseqBelow Tjk2Time, water temperature difference delta TsqLess than Tjc2When the solar greenhouse is in a hot state, the second heat collection and release group and the air inlet of the solar greenhouse are closed, and only the first heat collection and release group is reserved for heat collection; when the temperature T of the greenhouseqBelow Tjk1And water temperature difference Δ TsqLess than Tjc1When the temperature is higher than the set temperature, the first heat collection and release group is closed;
after the second stage, closing the heat preservation quilt;
the third stage, the first half night stable transportation stage; when the temperature T of the greenhouseqLower than the heat release temperature T of the first half nightfkAnd the water-air temperature difference DeltaTsqThe temperature difference T of the hot water and the gas is more than or equal to the first midnightfcWhen the heat is released, the first heat release group and the second heat release group are started simultaneously to release heat;
the fourth stage, the second half night function maintaining stage; when the temperature T of the greenhouseqLower than the late half-night heat release temperature Tfk2And the water-air temperature difference DeltaTsqMore than or equal to the temperature difference T of the released water and the gas at later nightfcAnd simultaneously starting the first heat release set and the second heat release set to release heat.
In the third phase, the greenhouse temperature TqGreater than or equal to Tfk1
In the fourth phase, the greenhouse air temperature TqGreater than or equal to Tfk2
In the first and second phases, Tjk1Temperature T of greenhouseq≤Tsfk
A fifth stage, namely an evening accelerated migration stage, is carried out before the third stage; simultaneously starting the first heat release group and the second heat release group to ensure that the temperature T of the greenhouseqRaising the temperature by 2-4 ℃ than the time when the heat preservation is closed, and maintaining the temperature for 1.5-2 hours.
A sixth stage, namely a photosynthetic awakening stage in the early morning is carried out before the first stage; simultaneously starting the first heat release group and the second heat release group to ensure that the temperature T of the greenhouseqRaised by 2-4 ℃ than the initial stage and maintained for 2-2.5 hours.
A seventh stage, an up-down synchronization stage, is performed when the first stage starts; and on the premise of keeping the first heat release set or the first heat release set and the second heat release set to normally operate, starting the root system heat release set, heating the root system heat release set 2, raising the temperature of the soil or the substrate by 2-4 ℃, and maintaining for 2.5-3 hours. The temperature of the root system is improved to improve the activity of the root system, and further improve the absorption rate of the root system to water and fertilizer, so as to meet the requirements of photosynthesis of leaves on the overground part on nutrients and moisture and achieve the synchronous consistency of the upper part and the lower part of the plant.
The seventh stage operates in synchronization with the first stage.
The invention has the beneficial effects that:
1. the strategy of gradient heat collection in the daytime and heat release according to time periods and temperature periods at night is adopted. When the daytime temperature is low, only one set of surface air cooler-fan is operated, so that unnecessary power consumption is reduced; if the residual heat in the air is rich in the daytime, all the surface coolers-fans are started to collect heat.
2. The night is divided into two time periods, the first half of the night adopts relatively high temperature, and the second half of the night adopts relatively low temperature, so that the total heat load at night is reduced.
3. The timely temperature change operation according with the growth rule of the plants is realized, the power consumption of the system is reduced, the operation heat load is reduced, and the efficiency and the energy are higher.
4. Three temperature control strategies according with the plant growth rule are added: enabling the temperature T of the greenhouse to be in the eveningqRaising the temperature by 2-4 ℃ than the time of closing the heat preservation quilt, and maintaining for 1.5-2 hours; accelerating the migration of the photosynthetic products from the leaves to other organs and tissues. Keeping the temperature T of the greenhouse in the early morningqRaising the temperature by 2-4 ℃ than the beginning of the stage and maintaining the temperature for 2-2.5 hours; awakening the plant and preheating for photosynthesis. Collecting heat in a surface cooler-a fan at the morning and afternoon while heating the underground buried pipe to raise the temperature of soil or matrix by 2-4 deg.C and maintain for 2.5-3 hr, so as to raise the temperature of root system and raise the activity of root system, and further raise the water and fertilizer absorption rate of the underground buried pipe to meet the requirement of leaves on the groundThe demand of photosynthesis on nutrients and water meets the requirement of upper and lower parts of plants.
Drawings
FIG. 1 is a schematic top view of an embodiment of a surface cooler-fan based sunlight greenhouse temperature control method of the present invention;
FIG. 2 is a schematic partial structure diagram according to an embodiment of the present invention;
fig. 3 shows measured changes in air temperature between 1 month and 8 days and 1 month and 9 days of 2020 in example 1 of the present invention.
Wherein: 1-first set of exotherm groups; 2-root system heat release group; 3-second integrated heat release group; 4-underground buried pipe water supply and return pipeline; 5-surface cooler-fan water supply and return pipeline; 6-circulating water pump; 7-heat preservation reservoir.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.
The sunlight greenhouse active heat collection and release system provided with the surface cooler-fan in the embodiment of the invention shown in the figures 1-3 comprises: the surface air cooler-fan, the underground buried pipe water supply and return pipeline 4, the surface air cooler-fan water supply and return pipeline 5, the circulating water pump 6, the heat preservation reservoir 7, the underground buried pipe, the control system and the like, wherein a plurality of surface air coolers-fans are hung under the ridge of the sunlight greenhouse, each surface air cooler-fan is connected with the heat preservation reservoir 7 through the circulating water pump 6 and the surface air cooler-fan water supply and return pipeline 5, the underground buried pipe is arranged at the depth of 10-12cm of soil or matrix, and the underground buried pipe is connected with the heat preservation reservoir 7 through the circulating water pump 6 and the underground buried pipe water supply and return pipeline 4.
The control system is connected with a thermometer for collecting the water temperature of the heat preservation reservoir 7, the temperature of the greenhouse and the temperature of the soil or the matrix at the depth of 10cm, and is also connected with each surface cooler-fan, the underground buried pipe and the circulating water pump 6 to control the on and off of the heat collection and release system.
The surface coolers-fans are grouped in a staggered mode according to the sequence, the odd number is a first heat collecting and releasing group 1, and the even number is a second heat collecting and releasing group 3; the underground buried pipe is a root system heat release group 2; the three groups of the first heat release group 1, the second heat release group 3 and the root system heat release group 2 are controlled by the same control system, the three groups share one heat preservation reservoir 7, and the three groups are connected with the heat preservation reservoir 7 through a circulating water pump 6.
The control method of the sunlight greenhouse temperature change used by the sunlight greenhouse active heat collection and release system provided with the surface cooler-fan comprises the following steps:
the first stage and the second stage are heat collection processes:
the first stage, the heat collecting stage in the morning; when the temperature T of the greenhouseqHigher than the low-temperature heat collection set air temperature Tjk1And water temperature difference Δ TsqTemperature difference T of more than or equal to low-temperature heat collecting water gasjc1When the heat is collected, the control system starts a first heat collecting and releasing group 1 of the active heat collecting and releasing system to collect heat; when the temperature T of the greenhouseqHigher than the high-temperature heat collection set air temperature Tjk2And water temperature difference Δ TsqTemperature difference T of high-temperature heat collecting water and gas is more than or equal tojc2When the heat is collected, the control system starts the second heat collecting and releasing group 3 to collect heat together with the first heat collecting and releasing group 1; when the temperature T of the greenhouseqHigher than the upper limit of the suitable temperature T of the cropssfkWhen the greenhouse is in use, opening a tuyere of the sunlight greenhouse; water-gas temperature difference delta TsqThe difference between the water temperature in the heat preservation reservoir 7 and the air temperature is obtained, and the absolute value is obtained.
The second stage, the afternoon heat collection stage; when the temperature T of the greenhouseqBelow Tjk2Time, water temperature difference delta TsqLess than Tjc2When the solar greenhouse is in use, the second heat collection and release group 3 and the air ports of the solar greenhouse are closed, and only the first heat collection and release group 1 is reserved for heat collection; when the temperature T of the greenhouseqBelow Tjk1And water temperature difference Δ TsqLess than Tjc1At this point, the first heat-collecting and releasing group 1 is closed and the second phase is finished.
After the second stage, when the temperature of the greenhouse is lower than 20 ℃, the heat preservation quilt is closed, and the heat collection process is finished.
In the first stage and the second stage of the heat collection process in the two daytime, the temperature T of the greenhouseqIs substantially maintained at Tjk1And TsfkIn the meantime.
The third and fourth stages are exothermic processes:
the third stage, the first half night stable transportation stage; working greenhouseAir temperature TqLower than the heat release temperature T of the first half nightfkAnd the water-air temperature difference DeltaTsqThe temperature difference T of the hot water and the gas is more than or equal to the first midnightfcAnd simultaneously starting the first heat release set 1 and the second heat release set 3 to release heat. At this stage, the greenhouse temperature T is controlledqThe lowest value of (A) is Tfk1I.e. to maintain the temperature of the greenhouse at T or abovefk1
The fourth stage, the second half night function maintaining stage; when the temperature T of the greenhouseqLower than the late half-night heat release temperature Tfk2And the water-air temperature difference DeltaTsqMore than or equal to the temperature difference T of the released water and the gas at later nightfcAnd simultaneously starting the first heat release set 1 and the second heat release set 3 to release heat. At this stage, the greenhouse temperature T is controlledqThe lowest value of (A) is Tfk2That is, the temperature of the greenhouse is always maintained at T or abovefk2(ii) a The consumption of the photosynthetic products by the respiration of the plants can be effectively reduced due to the lower air temperature;
three auxiliary stages are also provided:
the fifth stage, the early evening accelerated migration stage. Before the third stage, the first heat release set 1 and the second heat release set 3 are started simultaneously to ensure that the greenhouse temperature T isqRaising the temperature by 2-4 ℃ than the time when the heat preservation is closed, and maintaining the temperature for 1.5-2 hours. Accelerating the migration of the photosynthetic products from the leaves to other organs and tissues.
The sixth stage, early morning photosynthetic awakening stage. Before the first stage, the first heat release set 1 and the second heat release set 3 are started simultaneously to ensure that the greenhouse temperature T isqRaised by 2-4 ℃ than the initial stage and maintained for 2-2.5 hours. Awakening the plant and preheating for photosynthesis.
A seventh stage, an up-down synchronization stage; at the beginning of the first stage, on the premise of keeping the first heat release group 1 or keeping the first heat release group 1 and the second heat release group 3 operating normally, the root system heat release group 2 is started, the root system heat release group 2 is heated, the temperature of the soil or the substrate is raised by 2-4 ℃, and the temperature is maintained for 2.5-3 hours. The temperature of the root system is improved to improve the activity of the root system, and further improve the absorption rate of the root system to water and fertilizer, so as to meet the requirements of photosynthesis of leaves on the overground part on nutrients and moisture and achieve the synchronous consistency of the upper part and the lower part of the plant.
As shown in table 1 and example 1 of fig. 3, in example 1, the rear wall and both side gable walls of the solar greenhouse are flexible materials, and the solar greenhouse itself does not have heat storage and release functions. The length of the greenhouse is 140 meters, the span between north and south is 10 meters, and the ridge height is 6 meters. The east gable wall is provided with a water storage capacity of 60m3The underground heat preservation reservoir.
The greenhouse adopts soil cultivation, and the crop is tomato.
A surface cooler-fan active heat collecting and releasing system is installed in the sunlight greenhouse: 18 surface air coolers-fans, 3 circulating water pumps, 1 heat preservation reservoir, a water supply and return pipeline, an underground buried pipe, a control system and the like.
The heat collecting and releasing system is divided into three groups, all controlled by the same control system, share one heat preservation reservoir and each circulating water pump of the three groups. The first heat collecting and releasing group comprises one half of all surface coolers-fans, 9 fans, 1 circulating water pump and a water supply and return pipeline; the second heat collecting and releasing group comprises the other half of all the surface air coolers-fans, 9 fans, 1 circulating water pump and a water supply and return pipeline; the root system heat release group comprises all underground buried pipes, 1 circulating water pump and a water supply and return pipeline.
The underground buried pipe in the root system heat release group is positioned at the depth of 10cm of the soil or substrate.
And the control system is used for collecting the water temperature of the heat preservation reservoir, the temperature of the greenhouse and the temperature of the soil at the depth of 10cm and controlling the opening and closing of the heat collection and release system.
Table 1 shows the measured soil temperature change at 1 month and 9 days 2020 in example 1;
note: in the table, 9:30-12:00 is the heating time period of soil
The sunlight greenhouse temperature variation control method specifically used in example 1 shown in table 1 is as follows:
the heat collection process specifically comprises the following steps:
the first stage, the heat collecting stage in the morning (9:30-12:00)). When the temperature T of the greenhouseqHigher than Tjk1At 21 deg.C and difference of water and air temp. Delta TsqGreater than or equal to Tjc1When the temperature is 3 ℃, the control system starts a first heat collecting and releasing group of the active heat collecting and releasing system to collect heat; when the temperature T of the greenhouseqHigher than Tjk226 ℃ and the difference of water and air temperature Delta TsqGreater than or equal to Tjc2When the temperature is 4 ℃, the control system starts the second heat collection and release group again to collect heat together with the first heat collection and release group; when the temperature T of the greenhouseqHigher than TsfkWhen the temperature is 30 ℃, the tuyere of the sunlight greenhouse is opened.
The second stage, the afternoon heat collecting stage (12:00-16: 30). When the temperature T of the greenhouseqBelow Tjk226 deg.C, difference of water and air temp. delta TsqLess than Tjc2When the temperature is 4 ℃, the second heat collection and release group and the air ports of the sunlight greenhouse are closed, and only the first heat collection and release group is reserved for heat collection; when the temperature T of the greenhouseqBelow Tjk1At 21 deg.C and difference of water and air temp. Delta TsqLess than Tjc1The first exotherm was turned off at 3 ℃.
And finishing the heat collection process in the daytime. In the process of heat collection, the temperature T of the greenhouseqSubstantially maintained between 21 ℃ and 30 ℃.
The heat release process is specifically as follows:
the third stage, the first midnight steady migration stage (19:30-24: 00). When the temperature T of the greenhouseqBelow Tfk114 ℃ and the difference of water and air temperature Δ TsqGreater than or equal to TfcAnd (4) starting the first heat release set and the second heat release set at the same time at the temperature of 1 ℃ to release heat.
The fourth phase, the second half night function maintenance phase (24:00-7: 00). When the temperature T of the greenhouseqBelow Tfk27 ℃ and the temperature difference delta T of water and airsqGreater than or equal to TfcAnd (4) starting the first heat release set and the second heat release set at the same time at the temperature of 1 ℃ to release heat.
The auxiliary stage is specifically as follows:
in the fifth stage, the first heat release group and the second heat release group are started simultaneously to ensure that the temperature T of the greenhouseqAt the start of this phase, the temperature was raised by 2 ℃ and maintained for 2.5 hours, compared to 7: 00. Awakening plants to preheat photosynthesis。
The sixth stage, early morning photosynthetic wake-up stage (7:00-9: 30). In the evening, the accelerated migration stage (18:00-19:30) is carried out, and the first heat release set and the second heat release set are simultaneously started to ensure that the greenhouse temperature T isqThe temperature was raised by 3 ℃ and maintained for 1.5 hours, compared to 17:00 when the incubation was turned off.
The seventh stage, the up-down synchronization stage (9:30-12: 00). On the premise of keeping the first and second heat collection and release groups to normally operate, the root heat release group is opened to heat the underground buried pipe, so that the temperature of the soil is raised by 2 ℃, and the soil is maintained for 3 hours, and the seventh stage and the first stage synchronously operate in the embodiment.
In example 2, the rear wall and both side gable walls of the solar greenhouse in beijing, tongzhou are made of polyethylene-styrene sheets, and the solar greenhouse itself has no heat storage and release functions. The length of the greenhouse is 25 meters, the span between south and north is 8 meters, and the ridge height is 3.8 meters. The east gable wall is provided with a water storage capacity of 13m3The underground heat preservation reservoir.
The greenhouse adopts soil cultivation, and the crop is tomato.
A surface cooler-fan active heat collecting and releasing system is installed in the sunlight greenhouse: 3 surface air coolers-fans, 2 circulating water pumps, 1 heat preservation reservoir, a water supply and return pipeline, an underground buried pipe, a control system and the like.
The heat collecting and releasing system is divided into three groups, all controlled by the same control system, share one heat preservation reservoir and each circulating water pump of the three groups. The first heat collecting and releasing group comprises one half (1) of all surface air coolers-fans, 1 circulating water pump and a water supply and return pipeline; the second heat collecting and releasing group comprises the other half (2) of all the surface air coolers-fans, 1 circulating water pump and a water supply and return pipeline; the root system heat release group comprises all underground buried pipes, circulating water pumps (1) and water supply and return pipelines.
The underground buried pipe in the root system heat release group is positioned at the depth of 10cm of the soil or substrate.
And the control system is used for collecting the water temperature of the heat preservation reservoir, the temperature of the greenhouse and the temperature of the soil at the depth of 10cm and controlling the opening and closing of the heat collection and release system.
The sunlight greenhouse temperature change control method specifically used in embodiment 2 is as follows:
the heat collection process specifically comprises the following steps:
the first stage, the heat collection stage in the morning (9:30-12: 00). When the temperature T of the greenhouseqHigher than Tjk1At 21 deg.C and difference of water and air temp. Delta TsqGreater than or equal to Tjc1When the temperature is 3 ℃, the control system starts a first heat collecting and releasing group of the active heat collecting and releasing system to collect heat; when the temperature T of the greenhouseqHigher than Tjk226 ℃ and the difference of water and air temperature Delta TsqGreater than or equal to Tjc2When the temperature is 4 ℃, the control system starts the second heat collection and release group again to collect heat together with the first heat collection and release group; when the temperature T of the greenhouseqHigher than TsfkWhen the temperature is 30 ℃, the tuyere of the sunlight greenhouse is opened.
The second stage, the afternoon heat collecting stage (12:00-16: 30). When the temperature T of the greenhouseqBelow Tjk226 deg.C, difference of water and air temp. delta TsqLess than Tjc2When the temperature is 4 ℃, the second heat collection and release group and the air opening of the sunlight greenhouse are closed, and only the first heat collection and release group is reserved for heat collection; when the temperature T of the greenhouseqBelow Tjk1At 21 deg.C and difference of water and air temp. Delta TsqLess than Tjc1The first exotherm was turned off at 3 ℃.
And finishing the heat collection process in the daytime. In the process of heat collection, the temperature T of the greenhouseqSubstantially maintained between 21 ℃ and 30 ℃.
The heat release process is specifically as follows:
the third stage, the first midnight steady migration stage (19:30-23: 00). When the temperature T of the greenhouseqBelow Tfk113 ℃ and the difference between water and air temperature Delta TsqGreater than or equal to TfcAnd (4) starting the first heat release set and the second heat release set at the same time at the temperature of 1 ℃ to release heat.
The fourth phase, the second half night function maintenance phase (23:00-7: 00). When the temperature T of the greenhouseqBelow Tfk27 ℃ and the temperature difference delta T of water and airsqGreater than or equal to TfcAnd (4) starting the first heat release set and the second heat release set at the same time at the temperature of 1 ℃ to release heat.
The auxiliary stage is specifically as follows:
the fifth stage, the early evening accelerated migration stage (18:00-19: 30). And simultaneously starting the first heat release set and the second heat release set, and raising the temperature of the greenhouse by 2.5 ℃ when the heat preservation is closed according to the ratio of 16:30, and maintaining the temperature for 1.5 hours.
The sixth stage, early morning photosynthetic wake-up stage (7:00-9: 30). The first and second heat release sets were started simultaneously to raise the greenhouse temperature by 2.5 ℃ at the beginning of the phase to 7:00 and maintained for 2.5 hours. Awakening the plant and preheating for photosynthesis.

Claims (8)

1. A sunlight greenhouse temperature control method based on a surface cooler-fan is characterized by comprising the following steps:
the first stage, the heat collecting stage in the morning; when the temperature T of the greenhouseqHigher than the low-temperature heat collection set air temperature Tjk1And water temperature difference Δ TsqTemperature difference T of more than or equal to low-temperature heat collecting water gasjc1When the heat collecting and releasing system is used, the control system starts a first heat collecting and releasing group of the active heat collecting and releasing system to collect heat; when the temperature T of the greenhouseqHigher than the high-temperature heat collection set air temperature Tjk2And water temperature difference Δ TsqTemperature difference T of high-temperature heat collecting water and gas is more than or equal tojc2When the heat collecting and releasing unit is started, the control system starts the second heat collecting and releasing unit to collect heat together with the first heat collecting and releasing unit; when the temperature T of the greenhouseqHigher than the upper limit of the suitable temperature T of the cropssfkWhen the greenhouse is in use, opening a tuyere of the sunlight greenhouse; water-gas temperature difference delta TsqTaking the absolute value of the difference between the water temperature in the heat preservation reservoir and the air temperature;
the second stage, the afternoon heat collection stage; when the temperature T of the greenhouseqBelow Tjk2Time, water temperature difference delta TsqLess than Tjc2When the solar greenhouse is in a hot state, the second heat collection and release group and the air inlet of the solar greenhouse are closed, and only the first heat collection and release group is reserved for heat collection; when the temperature T of the greenhouseqBelow Tjk1And water temperature difference Δ TsqLess than Tjc1When the temperature is higher than the set temperature, the first heat collection and release group is closed;
after the second stage, closing the heat preservation quilt;
the third stage, the first half night stable transportation stage; when the temperature T of the greenhouseqLower than the heat release temperature T of the first half nightfkAnd the water-air temperature difference DeltaTsqThe temperature difference T of the hot water and the gas is more than or equal to the first midnightfcWhen the heat is released, the first heat release group and the second heat release group are started simultaneously to release heat;
the fourth stage, the second half night function maintaining stage; when the temperature T of the greenhouseqLower than the late half-night heat release temperature Tfk2And the water-air temperature difference DeltaTsqMore than or equal to the temperature difference T of the released water and the gas at later nightfcAnd simultaneously starting the first heat release set and the second heat release set to release heat.
2. A surface cooler-fan based solar greenhouse temperature control method as claimed in claim 1, characterized in that in the third phase, the greenhouse air temperature TqGreater than or equal to Tfk1
3. A surface cooler-fan based solar greenhouse temperature control method as claimed in claim 1, characterized in that in the fourth stage, the greenhouse air temperature TqGreater than or equal to Tfk2
4. A surface cooler-fan based sunlight greenhouse temperature control method according to claim 1, characterized in that in said first and second phase, T isjk1Temperature T of greenhouseq≤Tsfk
5. A surface cooler-fan based solar greenhouse temperature control method as claimed in claim 1, characterized in that the fifth stage is performed before the third stage, the early evening migration stage; simultaneously starting the first heat release group and the second heat release group to ensure that the temperature T of the greenhouseqRaising the temperature by 2-4 ℃ than the time when the heat preservation is closed, and maintaining the temperature for 1.5-2 hours.
6. A surface cooler-fan based solar greenhouse temperature control method as claimed in claim 1, characterized in that the sixth phase, early morning photosynthetic wake-up phase, is performed before the first phase; simultaneously starting the first heat release group and the second heat release group to ensure that the temperature T of the greenhouseqHigher than the beginning of this stageThe temperature is increased by 2-4 ℃ and maintained for 2-2.5 hours.
7. A surface cooler-fan based solar greenhouse temperature control method as claimed in claim 1, characterized in that a seventh, up-down synchronization phase is performed at the beginning of the first phase; and on the premise of keeping the normal operation of the first heat-collecting and heat-releasing group or the first heat-collecting and heat-releasing group and the second heat-collecting and heat-releasing group, starting the root system heat-releasing group, heating the root system heat-releasing group, raising the temperature of the soil or the substrate by 2-4 ℃, and maintaining for 2.5-3 hours.
8. A surface cooler-fan based solar greenhouse temperature control method as claimed in claim 1, characterized in that the seventh stage is operated synchronously with the first stage.
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