CN107223495B - Fan wet curtain cooling device and control method - Google Patents

Fan wet curtain cooling device and control method Download PDF

Info

Publication number
CN107223495B
CN107223495B CN201710420101.8A CN201710420101A CN107223495B CN 107223495 B CN107223495 B CN 107223495B CN 201710420101 A CN201710420101 A CN 201710420101A CN 107223495 B CN107223495 B CN 107223495B
Authority
CN
China
Prior art keywords
temperature
indoor
wet curtain
outdoor
sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201710420101.8A
Other languages
Chinese (zh)
Other versions
CN107223495A (en
Inventor
齐振宇
聂鹏程
师恺
周杰
孔德栋
金蓉
刘松
丁文雅
胡美华
蔡林生
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang University ZJU
Original Assignee
Zhejiang University ZJU
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang University ZJU filed Critical Zhejiang University ZJU
Priority to CN201710420101.8A priority Critical patent/CN107223495B/en
Publication of CN107223495A publication Critical patent/CN107223495A/en
Application granted granted Critical
Publication of CN107223495B publication Critical patent/CN107223495B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • A01G9/22—Shades or blinds for greenhouses, or the like
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
    • A01G9/24—Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
    • 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
    • A01G9/247—Watering arrangements
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
    • G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/25—Greenhouse technology, e.g. cooling systems therefor

Abstract

The invention discloses a fan wet curtain cooling device and a control method, wherein the fan wet curtain cooling device comprises the following steps: the device comprises a water pump, a wet curtain, a water supply pipe, a spray head, a water return pool, an exhaust fan, a side window, a controller, a temperature sensor, a humidity sensor and an illumination sensor. The wet curtain cooling device is provided with a fan at one side of the greenhouse, and the other side of the greenhouse is provided with a horizontally placed wet curtain which supplies water to the wet curtain through a water pump and a spray head. The device is a certain included angle with the vertical surface through the wet curtain, so that the sun shading of the wet curtain side in the greenhouse by the wet curtain is reduced, and the effective use area of the greenhouse is increased. The wet curtain adopts the spray type water supply of the spray head, so that the threshold value of the external air humidity during the water gasification heat absorption and cooling of the wet curtain is improved, and the cooling performance and the cooling efficiency of the wet curtain cooling device are improved. In the control method, the feedforward control is adopted, so that the accuracy of temperature control and the cooling efficiency of energy are improved. The fan wet curtain cooling device can be widely applied to greenhouses with high environment control precision, high illumination requirements and good cooling effect.

Description

Fan wet curtain cooling device and control method
Technical Field
The invention relates to the technical field of greenhouse cooling, in particular to a fan wet curtain cooling device and a control method.
Background
At present, in the design of fan wet curtain heat sink, wet curtain adopts vertical installation, and in order to obtain good cooling effect, the area of wet curtain design is great, highly at 1-1.5 meters, has blocked the penetrating of sunshine outside the greenhouse, has influenced the daylighting of wet curtain side in the greenhouse for plant growth in 4 meters apart from wet curtain side in the greenhouse receives serious influence because of illumination is not enough. At present, on the control of a wet curtain, the control is only started or stopped according to outdoor humidity or indoor temperature, and the actual cooling effect is not considered; in the control of the fan, simple control of starting and stopping is generally performed according to indoor and outdoor temperatures, and appropriate cooling ventilation volume cannot be obtained. The existing wet curtain fan control method has low energy cooling efficiency, causes repeated rise and fall of indoor temperature and sudden start and stop of air flow, causes poor stability of the environment in a greenhouse, and influences the operation of equipment and the growth of plants in the greenhouse.
Disclosure of Invention
In order to overcome the defects of the existing fan wet curtain cooling device, the invention provides the fan wet curtain cooling device and the control method. The atomizing spray head is adopted for supplying water, so that the contact area and time of water and air are increased, the water and air are in contact more fully, the threshold value of the external air humidity is increased when the wet curtain is subjected to water gasification heat absorption cooling, and the cooling performance of the wet curtain cooling device is improved. In the control method, the starting of the variable frequency fan and the wet curtain water pump is controlled according to the radiation intensity, the temperature inside and outside the greenhouse and the humidity difference. In the control of the variable frequency fan, a feedforward control method is adopted to calculate the optimum ventilation quantity and the optimum curtain passing air speed, and the exhaust quantity of the exhaust fan is adjusted to control, so that the cooling efficiency of energy is improved. The heating device is suitable for being applied to greenhouses with high requirements on illumination, good cooling effect and high temperature control precision.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a fan wet curtain cooling device is used for cooling a greenhouse and comprises a shell, a side window, an outdoor air temperature sensor, an outdoor humidity sensor, an atomizing spray head, a wet curtain, a water supply pipe, a water return pool, a water pump, a radiation intensity sensor, an indoor air temperature sensor, an indoor humidity sensor, a variable frequency fan, an electric push rod and a controller; the side window is hinged to the upper end of the shell, one end of the electric push rod is hinged to the side window, and one end of the electric push rod is hinged to the shell; wet curtain sets up in the casing, the return water pond sets up the below at wet curtain, the water pump is placed in the return water pond, and the delivery port of water pump links to each other with the one end of delivery pipe, and atomizer is installed to the other end of delivery pipe, and atomizer is located the top of wet curtain, it has the air outlet to open on the casing, the air outlet is located between wet curtain and the return water pond, the air outlet communicates with each other with one side of greenhouse, the opposite side at the greenhouse is installed to the frequency conversion fan, outdoor temperature sensor and outdoor humidity transducer set up outside the greenhouse, and radiation intensity sensor, indoor temperature sensor and indoor humidity transducer all set up in the greenhouse, outdoor temperature sensor, outdoor humidity transducer, water pump, radiation intensity sensor, indoor temperature transducer, indoor humidity transducer, frequency conversion fan and electric putter all link to each other with the controller.
Furthermore, the radiation intensity sensor, the indoor air temperature sensor and the indoor humidity sensor are arranged at the middle positions in the greenhouse.
Furthermore, the included angle between the air inlet side surface of the wet curtain and the vertical plane is theta, and the theta is more than 0 and less than or equal to 90 degrees.
Further, the θ value is preferably 90 °.
The invention also aims to provide a control method of the fan wet curtain cooling device, which comprises the following steps:
firstly, setting a temperature threshold value for starting indoor cooling on a controller; the controller receives information transmitted by an outdoor air temperature sensor, an outdoor humidity sensor, a radiation intensity sensor, an indoor air temperature sensor and an indoor humidity sensor in real time;
step two, the outdoor air temperature sensor and the indoor air temperature sensor transmit the detected temperature signals and the indoor solar radiation value detected by the radiation intensity sensor to the controller, and the controller starts the temperature reduction according to the set temperature threshold T, the received outdoor temperature and the influence value of the radiation intensity on the indoor temperatureCalculating an indoor desired air temperature ThThe calculation is as follows:
Th＝TS+To+Tr
TO＝k1×(t-t0)
Tr＝k2×(r-r0)
in the formula TSIs a set standard temperature; t isoIs the influence of outdoor temperature on indoor temperature, TrThe influence value of solar irradiance on indoor temperature is obtained; k is a radical of1For calculating the influence coefficient, k, of the outdoor temperature on the influence value of the indoor temperature2For calculating the influence coefficient of the solar irradiance indoor temperature influence value, t is the current outdoor temperature, t0For a specified outdoor temperature reference value, r is the current outdoor irradiance, r0Is a specified outdoor irradiance reference value;
if the indoor desired air temperature ThThe temperature is higher than a temperature threshold T for setting indoor starting and cooling, the controller controls the side window to be opened, and the variable frequency fan is started to work; otherwise, the controller controls the variable frequency fan to stop working and controls the electric push rod to close the side window;
step three, when the controller controls the variable frequency fan to start, the ventilation volume of the variable frequency fan is calculated as follows: by the actual measured air temperature t in the current room2(n) and the room temperature t 5 minutes before2Difference | t of (n-1)2(n-1)-t2(n) l is used for measuring the indoor temperature change speed;
setting a threshold value delta, when t2(n-1)-t2When (n) | is more than or equal to delta, the fan ventilation Q (n +1) in 5 minutes after calculation by adopting a proportion regulation method is as follows:
Q(n+1)＝Q+kp×[t1(n+2)-t2(n)]+Qo+Qr
QO＝ko×(t-t0)
Qr＝kr×(r-r0)
in the formula, Q is set standard ventilation; t is t1(n +2) is the indoor desired air temperature after 10 minutes; k is a radical ofpIs a proportionality coefficient; qoFor the influence of outdoor temperature on the calculation of ventilation, QrCalculating the influence value of the solar irradiance on the ventilation quantity; k is a radical ofoFor the coefficient of influence, k, of outdoor temperature on the calculated ventilationrCalculating the influence coefficient of the solar irradiance on the ventilation quantity;
when | t2(n-1)-t2(n)|<δ, and | t2(n)-t1(n+2)|>δ1Then, the steady state error is eliminated by integration, and the ventilation Q (n +1) in the last 5 minutes is:
Figure BDA0001314725810000041
in the formula ofiIs a positive value integral coefficient, t (n) is a set indoor air temperature drop temperature, delta1Another threshold value that is set;
step four, detecting a humidity signal every 5 minutes by the outdoor humidity sensor and the indoor humidity sensor, transmitting the detected humidity signal to the controller, and controlling the water pump to stop or start by the controller according to the detected humidity signal, wherein the calculation is as follows:
Figure BDA0001314725810000042
wherein P is the starting state of the water pump, 1 is the starting state, and 0 is the stopping state; hiThe humidity value detected by the indoor humidity sensor; hoThe humidity value detected by the outdoor humidity sensor; h is a humidity threshold value for starting the water pump; t is1The actual temperature value detected by the indoor air temperature sensor; t is a temperature threshold value for setting indoor starting and cooling; and c is the temperature threshold value for starting the water pump.
Through the first step to the fourth step, the controller controls the air inlet amount of the fan and the opening and the stopping of the wet curtain, so that the temperature in the greenhouse is adjusted, and the indoor temperature meets the requirement of temperature reduction.
The invention has the beneficial effects that: compared with the vertical installation design of the wet curtain, the wet curtain and the horizontal plane form a certain included angle, so that the sun shading of the wet curtain to the side of the wet curtain in the greenhouse is reduced, and the effective use area of the greenhouse is increased; the atomizing spray head is adopted for supplying water, so that the contact area and time of water and air are increased, the water and the air are more fully contacted, the threshold value of the external air humidity is improved when the wet curtain is subjected to water gasification heat absorption and cooling, and the cooling performance of the wet curtain cooling device is improved; on the control of the discharge amount of the variable frequency fan, a feedforward control method is adopted, the optimum ventilation amount and the curtain passing wind speed are calculated according to the radiation intensity and the temperature change inside and outside the greenhouse, and the control is carried out by adjusting the exhaust amount of the variable frequency fan, so that the cooling efficiency of energy is improved; in the control of the wet curtain, the start and stop of the water pump of the wet curtain are controlled through the indoor and outdoor humidity difference, and the cooling efficiency of the energy is improved.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a side view of the wet curtain side mounting of the present invention;
FIG. 3 is a control flow diagram of the present invention;
in the figure, a side window 1, an outdoor air temperature sensor 2, an outdoor humidity sensor 3, an atomizing nozzle 4, a wet curtain 5, a water supply pipe 6, a water return pool 7, a water pump 8, a radiation intensity sensor 9, an indoor air temperature sensor 10, an indoor humidity sensor 11, a variable frequency fan 12, a greenhouse 13, a shell 14 and an air outlet 15.
Detailed Description
The invention is further described with reference to the following figures and examples;
as shown in fig. 1, a fan wet curtain cooling device is used for cooling a greenhouse 13, and comprises a housing 14, a side window 1, an outdoor air temperature sensor 2, an outdoor humidity sensor 3, an atomizing nozzle 4, a wet curtain 5, a water supply pipe 6, a water return tank 7, a water pump 8, a radiation intensity sensor 9, an indoor air temperature sensor 10, an indoor humidity sensor 11, a variable frequency fan 12, an electric push rod and a controller; the side window 1 is hinged to the upper end of the shell 14, one end of the electric push rod is hinged to the side window 1, and one end of the electric push rod is hinged to the shell 14; the wet curtain 5 is arranged in the shell 14, the water return pool 7 is arranged below the wet curtain 5, the water pump 8 is placed in the water return pool 7, the water outlet of the water pump 8 is connected with one end of the water supply pipe 6, the atomizing nozzle 4 is installed at the other end of the water supply pipe 6, the atomizing nozzle 4 is positioned above the wet curtain 5, the shell 14 is provided with the air outlet 15, the air outlet 15 is positioned between the wet curtain 5 and the water return pool 7, the air outlet 15 is communicated with one side of the greenhouse, the variable frequency fan 12 is installed at the other side of the greenhouse, the outdoor air temperature sensor 2 and the outdoor humidity sensor 3 are arranged outside the greenhouse, the radiation intensity sensor 9, the indoor air temperature sensor 10 and the indoor humidity sensor 11 are all arranged in the greenhouse, and the outdoor air temperature sensor 2, the outdoor humidity sensor, the water pump 8, the radiation intensity sensor 9, the indoor air temperature sensor 10 and the indoor humidity sensor 11 are all arranged in the greenhouse, The variable frequency fan 12 and the electric push rod are both connected with a controller; the controller may be, but is not limited to, a product of the Priva company, a next model.
Further, the radiation intensity sensor 9, the indoor air temperature sensor 10 and the indoor humidity sensor 11 are arranged at middle positions in the greenhouse.
As shown in fig. 2, the included angle between the air inlet side surface of the wet curtain 5 and the vertical plane is theta, 0< theta > is less than or equal to 90 degrees; the value of θ is preferably 90 °.
The wet curtain 6 adopts the water pump 8 and arranges the atomizer 5 water supply above the wet curtain 6, adopts the return water pond 7 of arranging below the wet curtain 6 to carry out the collection of return water.
When frequency conversion fan 12 starts, water pump 8 is through 5 water sprays of atomizer, and dry and hot air is inhaled because of the greenhouse negative pressure, and through the water spray atomization region of wet curtain 6 top, partial heat is taken away in aqueous gasification, and wet curtain 6 is fallen into to non-gasified water, and the air that has not yet reached saturation humidity passes through wet curtain 2, and the water gasification on the wet curtain 2 further cools down the air that gets into, obtains wet cold air, and wet cold air gets into in the greenhouse, the indoor ambient temperature of cooling. The moist and cool air absorbs the solar radiation heat entering the greenhouse in the greenhouse to be heated, and is discharged to the outside of the greenhouse through the variable frequency fan 12.
On the control of the fan wet curtain cooling device, the change of the air exhaust amount of the variable frequency fan and the starting and stopping of the wet curtain water pump are adopted for controlling. Because the temperature in the greenhouse is influenced by the outdoor temperature and the solar radiation factor, the method for controlling the exhaust air volume of the variable-frequency fan by adopting the proportion integral with feedforward (as shown in figure 3) specifically comprises the following steps:
firstly, setting a temperature threshold value for starting indoor cooling on a controller; the controller receives information transmitted by the outdoor air temperature sensor 2, the outdoor humidity sensor 3, the radiation intensity sensor 9, the indoor air temperature sensor 10 and the indoor humidity sensor 11 in real time;
step two, the outdoor air temperature sensor 2 and the indoor air temperature sensor 10 transmit the detected temperature signals and the indoor solar radiation value detected by the radiation intensity sensor 9 to the controller, the controller calculates the indoor expected air temperature according to the set temperature threshold value T for starting temperature reduction, the received outdoor temperature and the influence value of the radiation intensity on the indoor temperature, and the indoor expected air temperature ThThe calculation is as follows:
Th＝TS+To+Tr
TO＝k1×(t-t0)
Tr＝k2×(r-r0)
in the formula TSIs a set standard temperature; t isoIs the influence of outdoor temperature on indoor temperature, TrThe influence value of solar irradiance on indoor temperature is shown; k is a radical of1For calculating the influence coefficient, k, of the outdoor temperature on the influence value of the indoor temperature2For calculating the influence coefficient of the solar irradiance indoor temperature influence value, t is the current outdoor temperature, t0For a specified outdoor temperature reference value, r is the current outdoor irradiance, r0Is a specified outdoor irradiance reference value;
if the indoor desired air temperature ThThe temperature is higher than a temperature threshold T for setting indoor starting and cooling, the controller controls the side window 1 to be opened, and the variable frequency fan 12 is started to work; otherwise, the controller controls the variable frequency fan 12 to stop working, and controls the electric push rod to close the side window 1;
step three, when the controller controls the variable frequency fan 12 to start, the ventilation volume of the variable frequency fan is calculated as follows: by the actual measured air temperature t in the current room2(n) and the room temperature t 5 minutes before2(n-1)Difference | t of2(n-1)-t2(n) l is used for measuring the speed of indoor air temperature change;
setting a threshold value delta, when t2(n-1)-t2When (n) | is more than or equal to delta, the fan ventilation Q (n +1) in 5 minutes after calculation by adopting a proportion regulation method is as follows:
Q(n+1)＝Q+kp×[t1(n+2)-t2(n)]+Qo+Qr
QO＝ko×(t-t0)
Qr＝kr×(r-r0)
in the formula, Q is set standard ventilation; t is t1(n +2) is the indoor desired air temperature after 10 minutes; k is a radical ofpIs a proportionality coefficient; qoFor the influence of outdoor temperature on the calculation of ventilation, QrCalculating the influence value of the solar irradiance on the ventilation quantity; k is a radical ofoFor the coefficient of influence, k, of outdoor temperature on the calculated ventilationrCalculating the influence coefficient of the solar irradiance on the ventilation quantity;
when | t2(n-1)-t2(n)|<δ, and | t2(n)-t1(n+2)|>δ1Then, the steady state error is eliminated by integration, and the ventilation Q (n +1) in the last 5 minutes is:
Figure BDA0001314725810000081
in the formula ofiIs a positive value integral coefficient, t (n) is a set indoor air temperature drop temperature, delta1Is another threshold value set;
step four, detecting a humidity signal every 5 minutes by the outdoor humidity sensor 3 and the indoor humidity sensor 11, transmitting the detected humidity signal to the controller, and controlling the water pump 8 to stop or start by the controller according to the detected humidity signal, wherein the calculation is as follows:
Figure BDA0001314725810000082
in the formulaP is the starting state of the water pump, 1 is starting, and 0 is stopping; hiIs the humidity value detected by the indoor humidity sensor 11; hoIs the humidity value detected by the outdoor humidity sensor 3; h is a humidity threshold value for starting the water pump; t is1Is an actual temperature value detected by the indoor air temperature sensor 10; t is a temperature threshold value for setting indoor starting temperature reduction; and c is the temperature threshold value for starting the water pump.
Through the first step to the fourth step, the controller controls the air inlet amount of the fan and the opening and the stopping of the wet curtain, so that the temperature in the greenhouse is adjusted, and the indoor temperature meets the requirement of temperature reduction.

Claims (3)

1. The control method of the fan wet curtain cooling device is characterized in that the fan wet curtain cooling device is used for cooling a greenhouse (13), and comprises a shell (14), a side window (1), an outdoor air temperature sensor (2), an outdoor humidity sensor (3), an atomizing spray head (4), a wet curtain (5), a water supply pipe (6), a water return tank (7), a water pump (8), a radiation intensity sensor (9), an indoor air temperature sensor (10), an indoor humidity sensor (11), a variable frequency fan (12), an electric push rod and a controller; the side window (1) is hinged to the upper end of the shell (14), one end of the electric push rod is hinged to the side window (1), and one end of the electric push rod is hinged to the shell (14); the wet curtain (5) is arranged in a shell (14), the water return pool (7) is arranged below the wet curtain (5), the water pump (8) is placed in the water return pool (7), a water outlet of the water pump (8) is connected with one end of a water supply pipe (6), an atomizing nozzle (4) is installed at the other end of the water supply pipe (6), the atomizing nozzle (4) is located above the wet curtain (5), an air outlet (15) is formed in the shell (14), the air outlet (15) is located between the wet curtain (5) and the water return pool (7), the air outlet (15) is communicated with one side of a greenhouse (13), the variable frequency fan (12) is installed at the other side of the greenhouse (13), the outdoor air temperature sensor (2) and the outdoor humidity sensor (3) are arranged outside the greenhouse (13), the radiation intensity sensor (9), the indoor air temperature sensor (10) and the indoor humidity sensor (11) are all arranged in the greenhouse (13), the outdoor air temperature sensor (2), the outdoor humidity sensor, the water pump (8), the radiation intensity sensor (9), the indoor air temperature sensor (10), the indoor humidity sensor (11), the variable frequency fan (12) and the electric push rod are all connected with the controller;
the method comprises the following steps:
firstly, setting a temperature threshold value for starting indoor cooling on a controller; the controller receives information transmitted by the outdoor air temperature sensor (2), the outdoor humidity sensor (3), the radiation intensity sensor (9), the indoor air temperature sensor (10) and the indoor humidity sensor (11) in real time;
step two, an outdoor air temperature sensor (2) and an indoor air temperature sensor (10) transmit detected temperature signals and indoor solar radiation values detected by a radiation intensity sensor (9) to a controller, the controller calculates indoor expected air temperature according to a set temperature threshold value T for starting temperature reduction, the received outdoor temperature and the influence value of the radiation intensity on the indoor temperature, and the indoor expected air temperature ThThe calculation is as follows:
Th＝TS+To+Tr
TO＝k1×(t-t0)
Tr＝k2×(r-r0)
in the formula TSIs a set standard temperature; t isoIs the influence of outdoor temperature on indoor temperature, TrThe influence value of solar irradiance on indoor temperature is shown; k is a radical of1For calculating the influence coefficient, k, of the outdoor temperature on the influence value of the indoor temperature2For calculating the influence coefficient of the solar irradiance indoor temperature influence value, t is the current outdoor temperature, t0For a specified outdoor temperature reference value, r is the current outdoor irradiance, r0Is a specified outdoor irradiance reference value;
if the indoor desired air temperature ThThe temperature is higher than a temperature threshold T for setting indoor starting and cooling, the controller controls the side window (1) to be opened, and the variable frequency fan (12) is started to work; otherwise, the controller controls the variable frequency fan (12) to stop working and controls the electric push rod to close the side window (1);
step three, when the controller controls the variable frequency fan (12) to start working, the ventilation volume of the variable frequency fan is calculated as follows: by the actual measured air temperature t in the current room2(n) and 5 minutesFront indoor air temperature t2Difference | t of (n-1)2(n-1)-t2(n) l is used for measuring the indoor temperature change speed;
setting a threshold value delta, when t2(n-1)-t2When (n) | is more than or equal to delta, the fan ventilation Q (n +1) in 5 minutes after calculation by adopting a proportion regulation method is as follows:
Q(n+1)＝Q+kp×[t1(n+2)-t2(n)]+Qo+Qr
QO＝ko×(t-t0)
Qr＝kr×(r-r0)
in the formula, Q is set standard ventilation; t is t1(n +2) is the indoor desired air temperature after 10 minutes; k is a radical ofpIs a proportionality coefficient; qoFor the influence of outdoor temperature on the calculation of ventilation, QrCalculating the influence value of the solar irradiance on the ventilation quantity; k is a radical ofoFor the coefficient of influence, k, of outdoor temperature on the calculated ventilationrCalculating the influence coefficient of the solar irradiance on the ventilation quantity;
when | t2(n-1)-t2(n) | < δ, and | t2(n)-t1(n+2)|＞δ1Then, the steady state error is eliminated by integration, and the ventilation Q (n +1) in the last 5 minutes is:
Q(n+1)＝Q(n)+Qi，
Figure FDA0003538270420000031
in the formula ofiIs a positive value integral coefficient, t (n) is a set indoor air temperature drop temperature, delta1Is another threshold value set;
step four, detecting a humidity signal once every 5 minutes by the outdoor humidity sensor (3) and the indoor humidity sensor (11), transmitting the detected humidity signal to the controller, and controlling the water pump (8) to stop or start by the controller according to the detected humidity signal, wherein the calculation is as follows:
Figure FDA0003538270420000032
wherein P is the starting state of the water pump, 1 is the starting state, and 0 is the stopping state; hiIs the humidity value detected by the indoor humidity sensor (11); hoIs the humidity value detected by the outdoor humidity sensor (3); h is a humidity threshold value for starting the water pump; t is1Is an actual temperature value detected by an indoor air temperature sensor (10); t is a temperature threshold value for setting indoor starting temperature reduction; c is the temperature threshold value for starting the water pump;
through the first step to the fourth step, the controller controls the air inlet amount of the fan and the opening and the stopping of the wet curtain, so that the temperature in the greenhouse is adjusted, and the indoor temperature meets the requirement of temperature reduction.
2. Control method according to claim 1, characterized in that the radiation intensity sensor (9), the indoor air temperature sensor (10), the indoor humidity sensor (11) are arranged in an intermediate position in the greenhouse (13).
3. The control method according to claim 1, characterized in that the angle between the air intake side of the wet curtain (5) and the vertical plane is θ, 0< θ ≦ 90 °.
CN201710420101.8A 2017-06-06 2017-06-06 Fan wet curtain cooling device and control method Active CN107223495B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710420101.8A CN107223495B (en) 2017-06-06 2017-06-06 Fan wet curtain cooling device and control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710420101.8A CN107223495B (en) 2017-06-06 2017-06-06 Fan wet curtain cooling device and control method

Publications (2)

Publication Number Publication Date
CN107223495A CN107223495A (en) 2017-10-03
CN107223495B true CN107223495B (en) 2022-05-27

Family

ID=59934807

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710420101.8A Active CN107223495B (en) 2017-06-06 2017-06-06 Fan wet curtain cooling device and control method

Country Status (1)

Country Link
CN (1) CN107223495B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108934639A (en) * 2018-07-26 2018-12-07 福建农林大学 Refrigeration machine-controllable the cooling system of wet curtain integrated greenhouse
CN109282408B (en) * 2018-11-05 2023-10-31 浙江大学 Wet curtain device of humidifying and cooling fan and control method
CN109429822B (en) * 2018-12-24 2023-09-29 浙江大学 Greenhouse inner curtain and control method
CN109681994B (en) * 2019-01-08 2024-02-06 浙江大学 Scientific greenhouse wet curtain cooling device and control method
CN110036917A (en) * 2019-04-12 2019-07-23 广西扬翔股份有限公司 The control method and thermoregulating system of thermoregulating system
CN115469699B (en) * 2022-09-20 2023-05-30 珠海格力电器股份有限公司 Temperature combined control method and device based on various cooling equipment and electronic equipment

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005024208A (en) * 2003-06-30 2005-01-27 Zen Sogo Kikaku:Kk Air conditioner utilizing convection of geothermal heat
KR20060066236A (en) * 2004-12-13 2006-06-16 이화의 The method of cultivating pellinus linteus
JP5830211B2 (en) * 2009-05-29 2015-12-09 株式会社誠和 Greenhouse cultivation system
CN102550339B (en) * 2011-12-09 2013-12-04 厦门永华光伏农业投资有限公司 Ground source type cold water serial irrigation system
CN202998947U (en) * 2012-12-19 2013-06-19 安农(福建）生态农业有限公司 Water curtain greenhouse for edible fungus cultivation
CN103048987A (en) * 2013-01-21 2013-04-17 江苏宏瑞通信科技股份有限公司 Internet-of-Things-based intelligent production monitoring terminal of agricultural greenhouse
CN203533721U (en) * 2013-07-22 2014-04-09 彭长儿 Wet curtain type cooling and humidifying ventilation cabinet and energy-saving greenhouse with the same
CN104509414A (en) * 2014-12-15 2015-04-15 中国科学院广州能源研究所 Energy self-supplying type intelligent greenhouse control system and method
CN204860218U (en) * 2015-08-14 2015-12-16 中节能（乐平)光伏农业科技有限公司 A wet curtain fan cooling system that is used for photovoltaic big -arch shelter to cultivate domestic fungus
CN205755703U (en) * 2015-09-30 2016-12-07 株洲亮仙荷菌业生态科技有限公司 A kind of edible fungus culturing is with solar powered energy-conservation booth
CN105265240A (en) * 2015-11-18 2016-01-27 湖北盛世地大农业产业发展有限公司 Rose cultivating room
CN206932814U (en) * 2017-06-06 2018-01-30 浙江大学 A kind of fan and pad heat sink

Also Published As

Publication number Publication date
CN107223495A (en) 2017-10-03

Similar Documents

Publication Publication Date Title
CN107223495B (en) Fan wet curtain cooling device and control method
CN109282408B (en) Wet curtain device of humidifying and cooling fan and control method
CN102679467B (en) Air-conditioner ventilating system for pretreatment workshop for dairy product production
CN209572597U (en) A kind of green house of vegetables for capableing of regulating and controlling temperature
CN104317272A (en) Remote greenhouse environment adjusting system
CN203949532U (en) IDC machine room closed cooling tower in winter
CN206932814U (en) A kind of fan and pad heat sink
CN109654647B (en) Intelligent adjustable ventilation system for underground space
CN208263118U (en) A kind of new concrete fog room control device
CN203764473U (en) Spraying machine
CN113597930B (en) Planting greenhouse
CN206959630U (en) Save reclaiming type cooling tower
CN211477566U (en) Self-circulation wind tunnel plant greenhouse
CN210891933U (en) Air conditioner with automatic humidification function
CN103673187A (en) Full-automatic sauna generator
CN109717008A (en) A kind of edible mushroom fresh air pretreatment system
CN107036206A (en) A kind of unpowered type Evaporative Cooling Air-conditioning System suitable for crow
CN208940513U (en) A kind of wine-growing greenhouse
CN208821326U (en) Refrigeration machine-controllable the cooling device of wet curtain integrated greenhouse
CN210267398U (en) Balanced type pollutant cleaning system
CN208635243U (en) A kind of Parking Area Service Area of Expressway roof solar heating cooling system
CN204648573U (en) Full-automatic Sauna furnace
CN208222730U (en) A kind of intelligent cooling tower using EC blower
CN204540171U (en) The temperature automatically controlled cooling system of green house
CN217900546U (en) Automatic temperature control device for cooling water tank

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant