JPH08103173A - Method for controlling environment of greenhouse - Google Patents

Abstract

PURPOSE: To provide a method for controlling the environment of a greenhouse by which the environment in the greenhouse can be adjusted with the minimum energy. CONSTITUTION: This method for controlling the environment of the greenhouse is to grasp the respective characters of a padding device 11, a side curtain device 12, a light shielding device 13, a supplemental lighting lamp device 14, a circulating fan device 15, a ventilating fan device 16, a roof skylight device 17, a cooling device 18 and a heating device 19 by a computer 2 and control the respective devices 11 to 19 using an energy model of the greenhouse 1 as a basis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the environment of a greenhouse, in which the cultivation environment in the greenhouse is kept optimal for plant growth.

[0002]

2. Description of the Related Art When cultivating a plant in a greenhouse, various environmental control devices such as lamps and fans are installed in the greenhouse in order to promote the growth of the plant. Then, by controlling the turning on / off of the lamps and the turning on / off of the fan, the environment of the greenhouse is controlled to be suitable for plant growth.

In the plant factory, the control of these environment adjusting devices is all automated. In particular, automation using a computer is being performed. According to this plant factory, it is possible to maintain the cultivation environment in the greenhouse in an optimal state for plant growth by using a large number of environment adjusting devices, so that it is possible to efficiently grow plants. This enables stable supply of plants.

[0004]

In a plant factory, various environmental adjustment devices are used to control the environment. Among environment-adjusting devices, a heating device, a cooling device, and the like consume a large amount of energy such as electric power. As a result, if the heating device or the cooling device is used for a long time to adjust the environment, the maintenance cost of the plant factory increases.

Also, for example, while operating a cooling device,
A sudden change in the outside air may cause a situation in which the temperature inside the plant factory drops too much. At this time,
The heating device operates and wastes energy.

An object of the present invention is to eliminate the above drawbacks and to provide a method for controlling the environment of a greenhouse which makes it possible to prepare the environment in the greenhouse with a minimum of energy.

[0007]

In order to achieve the object, the present invention provides a light-shielding curtain device for shielding sunlight.
Controlling the environment of a greenhouse including at least one of a heat-insulating curtain device that keeps the room warm, a skylight device that exhausts air, a ventilation device that compulsorily exhausts air, and a cooling device and a heating device that adjust the room temperature. In the greenhouse greenhouse control method to determine whether to control the light intensity in the greenhouse,
When controlling the light intensity, control the shade curtain device,
Keeping the inside of the greenhouse at a preset light intensity, judging whether to control the temperature inside the greenhouse, and when controlling the temperature, when cooling the greenhouse, the energy of the sunlight incident on the greenhouse and the equipment in the greenhouse The amount of heat energy that flows into the greenhouse is calculated from the heat generated in the greenhouse and the heat flow through the wall of the greenhouse, and from the temperature and enthalpy of the air inside and outside the greenhouse, the ventilation capacity of the heat energy due to the ventilation of the skylight device and the ventilation device is calculated. , Operate the skylight device based on the heat energy flowing into the greenhouse and the ventilation capacity of the skylight device, operate the ventilation device when the cooling by the skylight device is insufficient, and operate the cooling device when the cooling by the ventilation device is insufficient. When controlling the temperature, when heating the greenhouse, measure the light intensity of sunlight, and when the measured light intensity is low, move the heat insulation curtain device to keep the greenhouse warm and keep it warm. When the heating by the heating device is insufficient, the necessary heat energy is calculated from the amount of heat energy that flows into the greenhouse to operate the heating device to determine whether to control the humidity in the greenhouse. The absolute humidity of the air inside and outside and the amount of moisture in the air exhausted by ventilation from the enthalpy and the loss of heat energy are calculated, and the ventilation device is operated based on the calculation result.

[0008]

[Operation] By this, when controlling the light intensity in the greenhouse,
The blackout curtain device is controlled to keep the inside of the greenhouse at a preset light intensity.

When cooling a greenhouse, the amount of heat energy that flows into the greenhouse is calculated from the energy of sunlight entering the greenhouse, the heat generated by the equipment inside the greenhouse, and the heat flow through the walls of the greenhouse, and the air inside and outside the greenhouse is calculated. Ventilation capacity of heat energy by ventilation of skylight device and ventilation device is calculated from the temperature and enthalpy. Then, based on the heat energy flowing into the greenhouse and the ventilation capacity of the skylight device, the skylight device, the ventilation device, and the cooling device are moved in this order.

When heating a greenhouse, the light intensity of sunlight is measured. Then, when the light intensity becomes low, the heat insulation curtain device and the heating device are moved in this order.

When controlling the humidity inside the greenhouse, the amount of moisture in the air discharged by ventilation and the loss of heat energy are calculated from the absolute humidity and enthalpy of the air inside and outside the greenhouse.
Then, the ventilation device is moved based on the calculation result.

These controls maintain the greenhouse environment with minimal energy.

[0013]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 5 is a schematic diagram showing a plant factory for carrying out the present invention. In this plant factory, in order to maintain the cultivation environment of the greenhouse 1 in an optimal state for growing the plants of the cultivation unit 3, the computer 2 intensively controls the environment adjustment equipment.

The greenhouse 1 includes a pad device 11 for cooling with latent heat, a side curtain device 12 for keeping heat and shielding light, a shading curtain device 13 for shielding sunlight, and a supplementary lamp device 14. And a circulation fan device 15 and a ventilation fan device 16 for ventilating the greenhouse 1.
And a skylight device 17 for replacing the air in the greenhouse 1,
A cooling device 18 and a heating device 19 are provided as environment adjusting devices.

The pad device 11 is composed of a honeycomb paper 101 as shown in FIG. 6 (a). The honeycomb paper 101 includes a hexagonal water-permeable column portion 102 and air 11
A hole 103 for passing 1 is provided. The pad device 11 is
As shown in FIG. 6B, the pad section 104 is formed by arranging the honeycomb papers 101 of FIG. 6A. Then, when water 112 is poured into the pad portion 104 of the pad device 11, the air 111 passing through the holes 103 is cooled by the latent heat of vaporization of water. That is, as shown in FIG. 6C, if the air intake side 1A of the pad device 11 is attached to the outside of the greenhouse 1 and the air blowing side 11B is attached to the inside of the greenhouse 1,
The outside air is cooled and flows into the greenhouse 1 so that the greenhouse 1 can be cooled.

In the greenhouse 1, a house pyranometer 21, a house illuminance meter 22, a house thermometer 23 as a dry-bulb thermometer, a house thermometer 24 as a wet-bulb thermometer, in order to check the cultivation environment. House thermometer 25 to measure the temperature of the ceiling
And are provided as sensors. Further, outside the room, an outside air thermometer 31 as a dry bulb thermometer, an outside air thermometer 32 as a wet bulb thermometer, a wind direction anemometer 33, and an outdoor pyranometer 34 are provided as sensors.

The computer 2 calculates each heat energy balance of the greenhouse 1 using each sensor. That is, the computer 2 calculates the amount of energy incident on the greenhouse 1 as follows based on the incidence of sunlight, the flow through the wall surface, the heat generation in the greenhouse, and the like. The computer 2 calculates the energy amount A1 [J / s] of the sunlight incident on the greenhouse 1 from the formula A1 = outdoor solar radiation intensity × roof light transmittance × floor area (1).

Energy amount A of sunlight incident on the cultivation section 3
2 [J / s] is calculated from the formula of A2 = outside solar radiation intensity x roof light transmittance x curtain light transmittance x floor area (2).

Energy amount A3 incident by roof flow
[J / s] is calculated from the formula A3 = (outside air temperature-ceiling temperature) × roof area × ceiling heat transfer coefficient (3.1).

When the light-shielding curtain device 13 is in an open state, the amount of energy A4 [J / s] entering the cultivation section 3 from the ceiling through the ceiling flow is A4 = A3 = (outside temperature-ceiling temperature). × roof area × ceiling heat transfer coefficient (3.2) When the light-shielding curtain device 13 is in the closed state, A4 = (ceiling temperature-cultivation temperature) x light-shielding curtain heat transfer coefficient × Ceiling area (3.3) Calculate from the formula.

Amount of energy A5 incident due to side wall flow
[J / s] is A5 = (outside temperature-south cultivation area temperature) x south side wall area x south side wall heat transmission coefficient + (outside temperature-north cultivation part temperature) x north side wall area x north side wall heat transmission coefficient + ( Calculated from the formula: outside air temperature-eastern cultivation part temperature) x east side wall area x east side wall heat transfer coefficient + (outside temperature-west cultivation part temperature) x west side wall area x west side wall heat transfer coefficient (3.4).

The heat generation amount A6 [J / s] generated by the supplementary lamp device 14 is calculated from the following formula: A6 = lamp power consumption × number of lamps (4).

Energy amount A7 [J / s] incident on the greenhouse 1
Is calculated from the formula A7 = A1 + A3 + A5 + A6 (5).

Energy amount A8 incident on the cultivation section 3 [J / s]
Is calculated from the formula A8 = A2 + A4 + A5 + A6 (6).

Energy amount A9 of sunlight incident on the south surface
[J / s] is calculated from the following formula: A9 = sin (azimuth angle) / tan (elevation angle) × south side surface area × outdoor solar radiation intensity × sidewall light transmittance (7).

Next, the computer 2 calculates each enthalpy of the air inside and outside the greenhouse 1. First, computer 2
Is the enthalpy B of the air outside the greenhouse 1 from the outside air thermometer 31 which is a dry bulb thermometer and the outside air thermometer 32 which is a wet bulb thermometer.
1 is calculated from the formula of B1 = 4.186 × {0.24 × temperature + absolute humidity × (0.441 × temperature + 597.3)} (8). The computer 2 uses the equation (8) to calculate the house thermometer 23, which is a dry-bulb thermometer, and the house thermometer 24, which is a wet-bulb thermometer, from the south side and the central portion of the greenhouse 1.
Ceiling, north and east air enthalpies B2-B6
Is calculated. The equations for calculating these enthalpies B2 to B6 are (9) to (13). The south side of the greenhouse 1 is the nursery section, and the east side is in front of the fans.

The computer 2 calculates the energy ventilation capacity of the skylight device 17. When the skylight device 17 is in the fully open state, the ventilation rate is a. Temperature difference between outside temperature and ceiling b. As a function of the outside wind speed, the computer 2 defines the fully open ventilation speed C1 [g / s] as C1 = temperature ventilation coefficient × (ceiling temperature−outside air temperature) + wind ventilation coefficient × outside wind speed (14) Calculate from the formula. Then, the computer 2 uses the fully-open ventilation speed C1, the enthalpy B1 of the outside air, and the enthalpy B4 of the ceiling to calculate the fully-open ventilation capacity C2 [J / s] as C2 = C1 × (B4-B1) (15) Calculate from

The computer 2 calculates the cooling capacity when the pad device 11 and the ventilation fan device 16 are used.
That is, the computer 2 uses the enthalpy B1 of the outside air expressed by the equation (8) to determine the energy ventilation capacity D1 [J / s] per fan of the ventilation fan device 16 as follows: D1 = fan ventilation speed × (Enthalpy-B1 near fan) Calculated from the equation (16). After that, the computer 2 causes the energy amount A8 that is incident on the cultivation section 3 to be represented by the formula (6).
The exhaust temperature D2 [° C.] is calculated from the equation: D2 = outside air temperature + A8 / (fan exhaust speed × number of operating units × air specific heat) (17.1), and water is passed through the pad device 11. In this case, D2 = wet bulb temperature + A8 / (fan exhaust speed × number of operating units × air specific heat) (17.2)

The computer 2 uses these devices and sensors to perform the control shown in FIGS. 1 to 4 in order to keep the cultivation environment of the greenhouse 1 in an optimum state for plants.

First, the computer 2 determines whether to control the light intensity of the greenhouse 1 (step S1). When controlling the light intensity, the computer 2 uses the light-shielding curtain device 13 (step S2).

Maximum insolation intensity and minimum insolation intensity are preset in the computer 2. Maximum insolation intensity is the shade level for plants, and minimum insolation intensity is
This is a supplementary level for determining whether to use a supplementary lamp. The computer 2 is a greenhouse 1 using a pyranometer.
Of the solar radiation intensity of 1 minute is calculated, and the maximum value of the solar radiation intensity of the past 15 minutes is stored.

The computer 2 controls the light-shielding curtain device 13 so that the maximum value of the solar radiation intensity for the past 15 minutes of the cultivation section 3 becomes equal to or less than the maximum solar radiation intensity.

As a result, when the solar radiation intensity rapidly increases, the shading curtain device 13 which operates relatively slowly is made to follow the change in the solar radiation intensity, and the shading curtain device 13 is uselessly operated and frequently opened and closed. Operation can be eliminated.

The light-shielding curtain device 13 combines two layers of light-shielding curtains having different light-shielding rates to create four types of light-shielding states. That is, the light-shielding curtain device 13 does not shield light, shields light only by using the first-layer light-shielding curtain, shields light by using only the second-layer light-shielding curtain, and shields light by using both light-shielding curtains. Depending on the condition
There are four ways to block light. Further, the shading curtain device 13 is
When switching from the light-shielding state using the first-layer light-shielding curtain to the light-shielding state using the second-layer light-shielding curtain, the second-layer light-shielding curtain is completely closed and then the first-layer light-shielding curtain is started to open.

As a result, strong light does not strike the plants, and the influence on the plants is reduced. Computer 2
Controls such a shading curtain device 13.

However, there is an error in the setting of the maximum solar radiation intensity for the computer 2, and if the setting is made too high,
There is a possibility that the temperature of the greenhouse 1 becomes out of control. In this case, the plant is subjected to heat injury, the growth of the plant is inhibited, and cultivation becomes impossible. Therefore, in order to prevent such a situation, the computer 2 sets the limit insolation intensity E [W
/ M < ² >] is calculated from the equation of E = {(exhaust gas allowable temperature-outside air temperature) x (exhaust speed of fan x number of operating units x specific heat of air) -A3-A4-A6} / floor area (18). Then, when the set value of the solar radiation intensity exceeds the limit solar radiation intensity E, the computer 2 controls the light-shielding curtain device 13 by the limit solar radiation intensity E.

As a result, even if an incorrect setting is made or the temperature rises unexpectedly and the cooling capacity of the ventilation fan device 16 drops, the light intensity is automatically lowered and the greenhouse temperature is set to the optimum temperature for growing plants. You can keep 1.

Next, the computer 2 determines whether or not the side curtain device 12 is controlled to shield light (step S3). When the side curtain device 12 is used for shading (step S4), the computer 2 causes the cultivation unit 3 to calculate the energy amount A9 of the sunlight incident on the south surface, which is represented by the formula (7) and the formula (2). Using the energy amount A2 of the incident sunlight, when the condition 1 ... Outer solar radiation intensity> Maximum insolation intensity Condition 2 ... (A9 / A2)> 0.05 are simultaneously satisfied, the side on the south side of the side curtain device 12 Use curtains to block light. In addition, constant number 0.0
5 is a value that changes according to the position and operating state of the greenhouse 1.

In this control, the computer 2 converts the energy of the sunlight incident from the south side wall of the greenhouse 1 into the greenhouse 1.
Calculated from the longitude and latitude. That is, it is calculated from the position of the sun and the horizontal solar radiation intensity outside the greenhouse 1.

As a result, whether or not to operate the side curtain on the south side of the side curtain device 12 as a light-shielding curtain is determined from this calculated value, so that the load required for cooling can be suppressed.

When the indoor solar radiation intensity calculated from the external solar radiation intensity becomes equal to or lower than the minimum solar radiation intensity (step S5), the computer 2 operates the supplementary lamp device 14 to compensate for the shortage of light amount (step S6). At this time, the computer 2
Indicates that the duration of lighting or extinguishing is 10 minutes or more.

As a result, frequent lighting / extinguishing operations of the supplementary lamp device 14 can be prevented.

Since the sunlight incident on the greenhouse 1 will eventually become heat, the computer 2 next judges whether to control the temperature of the greenhouse 1 (step S7). When performing this control, the computer 2 accurately calculates the energy balance of the greenhouse 1 and the cooling / heating capacity of the environment adjusting device by using the equations (1) to (18). The computer 2 determines the optimum operation of the environmental adjustment device based on this calculation result.

That is, when the temperature of the greenhouse 1 is controlled, when cooling (step S8), the computer 2 first controls the skylight device 17 (step S9). At this time, the computer 2 uses the energy amount A7 incident on the greenhouse 1 shown in the equation (5) and the fully open ventilation capacity C2 shown in the equation (15), and the energy opening F1 of the skylight device 17.
Is calculated from the formula F1 = A7 / C2 (19). The energy opening degree F1 has a value of 0-1. Next, the computer 2 determines the energy opening F
1 is used to calculate the temperature opening F2 of the skylight device 17 from the formula: F2 = 1 minute before temperature opening + (current air temperature-target air temperature) / temperature control sensitivity (20). However, the computer 2 uses the formula (2
In 0), the temperature opening is calculated every 10 seconds, and the value is set to -1 to -1. Further, the computer 2 has the energy opening F1.
Using the temperature opening F2 and the temperature opening F2, the skylight opening F3 is calculated from the equation F3 = F1 + F2 (21).

The computer 2 controls the skylight device 17 based on the skylight opening F3. Calculated skylight opening F3
Is 0 or less, Condition 1 ... Indoor relative humidity> Control target value Condition 2 ... (Indoor temperature-Control target value)> -2.0 At the same time, the computer 2 causes the skylight device 1 to operate.
7 is controlled to set the skylight opening on the leeward side to "0.1".
Further, at the skylight opening F3, the following three stages of control are performed depending on the wind direction and speed of the outdoors.

[0047] In this restriction, the computer 2 detects the wind speed five times, calculates an average value, and sets the average value for 10 minutes as the wind speed. Further, the maximum wind speed is constantly monitored, and the memory for storing the wind speed is updated with the maximum wind speed. If the maximum wind speed is not updated for 10 minutes, the current wind speed is set as the maximum wind speed.

When the calculated skylight opening degree simultaneously satisfies the condition 1 ... "1" and the condition 2 ... room temperature> (control target value + 2 [° C]) (step S10), the computer 2 selects the skylight device 1
7 is fully closed, and the ventilation fan device 16 switches to cooling (step S11). In the condition 2, the temperature 2 [° C.] is variable. Furthermore, computer 2
Stores the incident energy at the time of switching in the memory, and when the current value of the incident energy is: Condition 1 ... 80% or less of the memory value Condition 2 ... Outside air temperature <control target value The cooling by 16 is switched to the cooling by the skylight device 17.

As described above, the computer 2 gives priority to cooling the greenhouse 1 using the skylight device 17.

The ventilation fan device 16 operates five fans or ten fans. Computer 2
The number of operating fans is calculated as follows. The computer 2 uses the energy amount A8 incident on the cultivation section 3 shown in the equation (6) and the energy ventilation capacity D1 per fan of the ventilation fan device 16 shown in the equation (16) for energy operation. The number of vehicles G1 is calculated from the equation G1 = A8 / D1 (22). Next, the computer 2 calculates the number G2 of temperature operation from the formula G2 = 1 number of temperature operation one minute ago + (current temperature-control target temperature) / temperature control sensitivity (23). However, the computer 2 calculates the number of temperature-operated vehicles in this equation every 10 seconds and sets the value to −10 to 10. Further, the computer 2 uses the energy operating number G1 and the temperature operating number G2 to calculate the operating number G3.
Is calculated from the equation of G3 = G1 + G2 (24). Also, when the room temperature is higher than the wet bulb temperature but lower than the outside air temperature, and the cooling efficiency decreases,
The computer 2 adjusts the operating number of fans regardless of the calculated operating number.

When the outside air temperature is high and the humidity is low,
The ventilation fan device 16 alone has little effect of cooling (step S12). At this time, the computer 2 operates the pad device 11 to perform cooling (step S13). However, if water is continuously supplied to the pad device 11, the blowing temperature of the pad device 11 may be too low. In this case, the computer 2 sets the control target value of the blowing temperature from the pad device 11 to be lower than the control target value of the room temperature 1.

In order to set the temperature of the air blown from the pad device 11 to the control target value, the target water permeability (water content) H1 to the pad device 11 is H1 = (outside air temperature-pad air blow control target value) / ( Outside temperature-outside air wet bulb temperature) (25) Further, the current water flow rate H2 of the pad device 11 is calculated from the formula of H2 = (indoor absolute humidity-outside air absolute humidity) / (indoor saturated absolute humidity-outside air absolute humidity) (26). Then, the computer 2 passes water to the pad device 11 when the condition 1 ... H2 <H1 is satisfied.

As a result, the blowing temperature from the pad device 11 can be arbitrarily controlled regardless of the outside air state indicated by the outside air thermometer 31 which is a dry bulb thermometer and the outside air thermometer 32 which is a wet bulb thermometer. it can. Further, it is possible to eliminate the need for a sensor that detects the blowout temperature of the pad device 11.

When the cooling by the pad device 11 is insufficient (step S14), the computer 2 causes the cooling device 1 to operate.
8 is used (step S15).

Next, the computer 2 determines whether or not to control heating (step S16). When heating, the computer 2 first controls the side curtain device 12 (step S17).

The side curtain device 12 is used for the greenhouse 1 at night.
And the greenhouse 1 at dusk in winter.
At this time, the computer 2 is: condition 1 ... outside solar radiation intensity <5 [W / m ² ] condition 2 ... outside air temperature <(indoor target temperature-3.0) condition 3 ... indoor air temperature <(indoor target air temperature-3.0) When all of the above are satisfied, the side curtain device 12 and the light-shielding curtain device 13 are used to perform the heat retaining operation.

As a result, the solar radiation intensity of the greenhouse 1 is 5 [W /
m ² ], it is judged that there is no heating effect by sunlight, and the heat retention operation is performed.

When the temperature of the greenhouse 1 further decreases (step S18), the computer 2 starts the temperature control of the greenhouse 1 using the heating device 19 (step S19).
At this time, when a plurality of heating devices 19 are provided, the computer 2 calculates the amount of heat required for heating from the energy balance, and determines the number of operating heating devices 19. Then, the computer 2 activates the heating device 19 when the condition 1 ... Indoor air temperature <(control target value-operation width). However, the operation width is
For example, it is changed to 1.0 1.5 2.0 depending on the energy state incident on the greenhouse 1. Further, when the condition 2 ... Indoor air temperature ≧ control target value is satisfied, the operation of the heating device 19 is stopped.

Next, the computer 2 determines whether to control the humidity of the greenhouse 1 (step S20). By controlling the humidity, the evaporation of water from the plants is prevented and the condensation on the inner wall surface of the greenhouse 1 is prevented. For this reason, the dehumidification of the greenhouse 1 is mainly performed in controlling the humidity. Dehumidification is performed by operating the skylight or the ventilation fan device 16 (step S
21).

When the greenhouse 1 is ventilated, water vapor and heat in the greenhouse 1 escape to the outside, resulting in energy loss. Therefore, the computer 2 calculates the absolute humidity and enthalpy in the greenhouse 1. By ventilation of air 1 [g], water corresponding to the difference in absolute humidity inside and outside the greenhouse 1 is discharged from the greenhouse 1, and energy corresponding to the enthalpy difference is lost.
The computer 2 calculates this loss. Then, the computer 2 compares the energy loss due to ventilation and the effect of dehumidification and selects an advantageous one.

In this way, according to this embodiment, the computer 2 grasps the characteristics of each environment adjusting device and controls each environment adjusting device by this, so that the greenhouse 1 can be operated with minimum energy. .

By the way, the computer 2 performs the following control in addition to the above.

First, CO ₂ (carbon dioxide gas) is supplied as follows. The computer 2 controls the supply of CO ₂ when Condition 1 (CO ₂ concentration-control target value) <-50 [ppm] is satisfied. However, when supplying CO ₂ , supply and stop are repeated in order to secure the diffusion time of CO ₂ .

The circulation fan device 15 is as follows.
The computer 2 controls the circulation fan device 15 to operate when the condition 1 ... the ventilation fan device 16 is stopped and the condition 2 ... the indoor wind speed setting of the greenhouse 1> 0 are simultaneously satisfied.

The concentration of the culture solution is as follows. The computer 2 controls the supply of the stock solution of the culture solution when Condition 1 ... (Culture solution concentration-control target value) <-0.2 is satisfied.

The pH (hydrogen ion concentration) of the culture solution is set as follows. The computer 2 controls to supply the alkaline solution to the culture solution when Condition 1 ... (Culture solution pH-control target value) <-1.0 is satisfied. Further, when Condition 2 ... (Culture solution pH-control target value)> 1.0 is satisfied, the acid solution is controlled to be supplied to the culture solution.

The temperature of the culture solution is as follows. The computer 2 heats the culture solution with a heater when Condition 1 ... (Temperature of culture solution-control target value) <-1.0 is satisfied, and Condition 2 ... (Temperature of culture solution-control target value)> When the 1.0 is satisfied, the culture is chilled. However, the dead zone of control is ± 0.5.

The culture solution is supplied as follows. The supply of the culture solution is 6 systems of 2 systems of water and 4 systems of the culture solution. The computer 2 independently controls the supply of the culture fluid of these 6 lines. The computer 2 sets the supply time of the culture solution and the rest time. At this time, the computer 2
Sets the rest time J of the culture solution using the formula: J = set rest time × (standard solar radiation intensity / average solar radiation intensity for the past 1 hour) (27). However, the rest time J satisfies the condition 1 ... J <set rest time × maximum rest ratio. The standard solar radiation intensity and the maximum resting magnification are parameters set in advance. Further, the computer 2 corrects the rest periods in the morning, noon, and evening with the average insolation intensity for the past one hour. Further, the computer 2 continuously supplies the culture solution to the seedling raising section.

[0069]

As described above, according to the present invention, the environmental control devices used in the greenhouse are prevented from interfering with each other, and the energy from the sunlight is maximally utilized. Can be operated efficiently. This allows
Energy such as electricity consumed to maintain and operate the greenhouse can be minimized.

[Brief description of drawings]

FIG. 1 is a flow chart showing an embodiment of the present invention.

FIG. 2 is a flowchart showing an embodiment of the present invention.

FIG. 3 is a flowchart showing one embodiment of the present invention.

FIG. 4 is a flowchart showing one embodiment of the present invention.

FIG. 5 is a schematic view showing a plant factory for carrying out the present invention.

FIG. 6 is a diagram for explaining a pad device.

[Explanation of symbols]

 1 greenhouse 2 computer 11 pad device 12 side curtain device 13 light-shielding curtain device 14 supplementary lamp device 15 circulation fan device 16 ventilation fan device 17 skylight device 18 air conditioner device 19 heating device

Claims (1)

[Claims] 1. A light-shielding curtain device which shields sunlight.
Controlling the environment of a greenhouse including at least one of a heat-insulating curtain device that keeps the room warm, a skylight device that exhausts air, a ventilation device that compulsorily exhausts air, and a cooling device and a heating device that adjust the room temperature. In the greenhouse environmental control method to determine whether to control the light intensity in the greenhouse, when controlling the light intensity, by controlling the shade curtain device,
Keeping the inside of the greenhouse at a preset light intensity, determining whether to control the temperature inside the greenhouse, and when cooling the greenhouse when controlling the temperature, the energy of the sunlight incident on the greenhouse and the equipment inside the greenhouse. The amount of heat energy that flows into the greenhouse is calculated from the heat generated in the greenhouse and the heat flow through the wall of the greenhouse. Operate the skylight device based on the heat energy flowing into the greenhouse and the ventilation capacity of the skylight device, operate the ventilation device when the cooling by the skylight device is insufficient, and operate the cooling device when the cooling by the ventilation device is insufficient. When heating the greenhouse when controlling the temperature, measure the light intensity of the sunlight, and when the measured light intensity is low, move the heat insulation curtain device to keep the greenhouse warm. When the heating by the heat insulation curtain device is insufficient, the necessary heat energy is calculated from the amount of heat energy flowing into the greenhouse to operate the heating device, determine whether to control the humidity in the greenhouse, and when controlling the humidity, The environmental control of the greenhouse characterized by calculating the absolute humidity of the air inside and outside the greenhouse and the amount of moisture in the air exhausted by ventilation from the enthalpy and the loss of heat energy, and operating the ventilation system based on this calculation result. Method.