JP7081124B2 - Control device and agricultural house - Google Patents

Description

This disclosure relates to an agricultural house.

Agricultural houses are known in which the indoor environment inside the house is controlled in order to grow crops. In such an agricultural house, dew condensation may adhere to the surface of the crop, and the dew condensation may cause deterioration of the quality of the crop. Cited Document 1 discloses a control device that controls the indoor environment inside the house by opening and closing a curtain or a window in the house depending on whether or not it is necessary to suppress dew condensation.

JP-A-2017-112916

However, in the above-mentioned control device, since the control for suppressing the dew condensation is performed in the case where the dew condensation occurs in the house and the case where the dew condensation occurs in the crop, the temperature and humidity suitable for promoting the growth of the crop are performed. Environmental control to meet such factors was sacrificed. That is, even in a situation where dew condensation is unlikely to occur directly on the surface of the crop, the environment for promoting the growth of the crop may not be maintained for a long time because the control for suppressing the dew condensation is performed.

One aspect of this disclosure is to provide a control device and an agricultural house that can maintain an environment for promoting crop growth for a long time while suppressing direct dew condensation on the surface of the crop. ..

One aspect of the present disclosure is a control device (2) that controls the indoor environment inside the agricultural house (1) for growing a crop (4), and is a control unit (S123) and a prediction unit. (S211) and. The control unit can execute inflow control in which the outside air, which is the outside air of the crop space, flows into the crop space where the crop exists inside the house. The prediction unit predicts whether dew condensation will occur on the crop by controlling the inflow. The prediction unit determines that the temperature of the air in the crop space is equal to or lower than the dew point temperature of the external air, and the absolute humidity of the external air is equal to or higher than the absolute humidity corresponding to 100% of the relative humidity of the air in the crop space. If it is determined that, it is predicted that dew condensation will occur on the crop. The control unit prohibits inflow control when it is predicted that dew condensation will occur by the prediction unit.

With such a configuration, inflow control is prohibited if condensation is expected to occur directly on the surface of the crop. On the other hand, in a situation where dew condensation is unlikely to occur directly on the surface of the crop, inflow control becomes easier. Therefore, it is possible to maintain the environment for promoting the growth of the crop for a long time while suppressing the direct dew condensation on the surface of the crop.

It is a schematic diagram which showed the agricultural house and its control composition. It is a schematic diagram which showed an example of the installation place of the temperature sensor and the humidity sensor in the house in a plan view. It is a flowchart of the dew condensation suppression process. It is a flowchart of arithmetic processing. It is a flowchart of the dew condensation prediction process. It is a figure which shows the state of a skylight and a curtain, and the control object which tries to control to the open state. It is a flowchart of dew condensation prevention processing.

Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings.
[1. Constitution]
In the agricultural house 1 shown in FIG. 1, the indoor environment in the house is controlled to an environment suitable for growth by the control device 2 for the purpose of growing a predetermined crop 4 inside the house. The controlled environmental factors are, for example, room temperature, humidity, carbon dioxide concentration and amount of solar radiation in the house. The control device 2 controls the operation of various temperature control devices, humidity control devices, air volume control devices, carbonic acid concentration control devices, water supply control devices, solar radiation control devices, etc. in order to properly control these environmental factors. It is an environmental control controller that can be used.

The agricultural house 1 has various sensors for measuring wind direction, wind speed, sunshine, presence or absence of precipitation, temperature, humidity, carbon dioxide concentration, etc. in the house, opening and closing of the skylight or curtain of the house, control of an air conditioner, and generation of mist. It also includes various adjustment devices for generating carbon dioxide and the like, and a control device 2. The control device 2 outputs a control signal according to the control index obtained from the measured values of the indoor environment in the house main body 3 to various adjusting devices, and the growing environment of the crop 4 is changed according to the situation inside and outside the house. Automatically control to be optimal. The measured values relating to the indoor environment provided at a plurality of locations are the detected values of the temperature sensor and the humidity sensor. Therefore, the temperature sensor and the humidity sensor detect the measured values at different points in the house.

The agricultural house 1 is an example for controlling the environment inside the house to be suitable for growth. If the condition that dew condensation is likely to occur directly on the surface of the crop 4 is satisfied, the environment inside the house is less likely to cause dew condensation. The dew condensation suppression control to be improved is implemented. According to this dew condensation suppression control, it is possible to avoid a situation in which the growth of the crop 4 may be adversely affected. Further, for example, when the crop 4 is a tomato or the like, the agricultural house 1 is an air conditioning management system capable of promoting photosynthesis and increasing the yield by automatically controlling the temperature, carbon dioxide concentration, etc. in the greenhouse cultivation of tomatoes. But it is also.

The house main body 3 includes, for example, a frame formed by combining metal members as structural materials, and a covering material supported by the frame. As the covering material, a translucent synthetic resin film or glass is used. The house main body 3 shown in FIG. 1 integrally includes a gable-shaped roof portion and two sets of side wall portions that support the roof portion and face each other. This form is an example, and the house main body 3 is provided. It is not intended to limit the composition of. Further, it does not prevent the use of other materials for the house body 3 or the formation into other shapes.

The crop 4 is cultivated in the soil in a predetermined container such as a bed 38 provided in the main body 3 of the house. The crop 4 grows by absorbing nutrients from the soil by supplying a nutrient solution containing water and fertilizer to the soil through a pipe by the water supply machine 37. As shown in FIG. 2, for example, the beds 38 are installed in a predetermined number and at equal intervals in a row in the house.

The water supply machine 37 is a water supply pump controlled by the control device 2. The control device 2 operates the water supply machine 37 at a predetermined time of the day to supply a target amount of nutrient solution to the medium. The control device 2 controls the water supply machine 37 so as to adjust the supply amount of the nutrient solution with respect to the target amount according to the amount of solar radiation detected by the solar radiation sensor 52.

The circulation fan 33 is a blower installed at a position higher than the crop 4, the temperature sensor 56, the humidity sensor 57, the carbon dioxide sensor 58, the side window 31, and the like in the upper part of the house body 3. The circulation fan 33 is controlled by the control device 2 to circulate the gas in the house body 3 and distribute it throughout. In this way, the circulation fan 33 constitutes an airflow forming device that forms an airflow in the house body 3 and around the crop 4, promotes adjustment of humidity, temperature, carbon dioxide concentration, etc. in the house, and also promotes adjustment of the crop 4. It also contributes to promoting growth. Further, the circulation fan 33 is preferably installed in a form in which a place where an air flow is formed in the house can be selected, and is movable by being fixed to a rail or the like extending horizontally or vertically in the house, for example. Is preferable.

The control device 2 obtains a control index by using the measured values of the temperature sensor 56, the humidity sensor 57, and the carbon dioxide sensor 58, which are provided in plurality. The control device 2 operates the circulation fan 33 according to the control index obtained from the measured values at a plurality of points in the house main body 3, thereby raising or lowering the room temperature in the house or increasing or lowering the carbon dioxide concentration or humidity in the house. Controls to make it uniform within. The control device 2 determines a control index by, for example, an operation for obtaining a maximum value, a minimum value, a difference, an average value, and the like for a plurality of measured values.

FIG. 2 shows an example of an environmental value detection location in the house main body 3 by a plurality of temperature sensors 56 and humidity sensors 57. In the example shown in FIG. 2, two temperature sensors 56 are installed in the house main body 3 in a plan view at a predetermined interval in the arrangement direction in which a plurality of beds 38 are arranged and in the direction orthogonal to the arrangement direction. It is a room temperature detecting means. In the illustrated example of FIG. 2, the two temperature sensors 56 are installed so as to be located diagonally in a plan view in the house. The humidity sensor 57 is installed at the same location as the temperature sensor 56.

The plurality of temperature sensors 56 and the plurality of humidity sensors 57 form relatively airflows such as in the center and in places where airflow is difficult to form and the airflow tends to stagnate, such as near the four corners or side walls in a plan-viewed house. It is installed in both easy-to-use places. Therefore, the temperature sensor 56 and the humidity sensor 57 contribute to environmental control of the inside of the house from a multi-viewpoint and a global perspective. The control device 2 determines the control index by the above-mentioned calculation using each measured value of these sensors.

The mist generator 34 includes a mist tube installed at a position higher than the crop 4, the humidity sensor 57, and the side window 31 in the upper part of the house. The mist tube is provided with a plurality of nozzles attached to the tube wall of the tube through which water is passed, and is configured so that water is sprayed from the nozzles by adjusting the pressure at which water is passed through the tube by a pump or the like. There is. Therefore, since the mist tube ejects water in the form of mist, the mist can fall from the upper part of the house over a relatively long time, and the humidity in the house can be gradually increased. Further, by operating the circulation fan 33 together with the mist ejection by the mist generator 34, the fog can be quickly distributed in the house, and the humidity can be accelerated.

The mist generator 34 is controlled by the control device 2. For example, the control device 2 operates the mist generator 34 at a predetermined time of the day to eject a target amount of fog, and controls the humidity environment in the house to be within the target range. The control device 2 adjusts the amount of fog ejected by the mist generator 34 according to the control index obtained from the measured values of the humidity at a plurality of places in the house, and controls the humidity environment in the house within the target range.

Further, the control device 2 controls the mist generator 34 so as to adjust the supply amount of fog with respect to the target amount according to the amount of solar radiation detected by the solar radiation sensor 52. Further, when the relative humidity in the house measured by the humidity sensor 57 is low, the control device 2 operates the mist generator 34 to supply fog into the house and control the relative humidity to increase. Further, although the mist generator 34 is operated mainly when humidifying, it can also be operated as a temperature lowering device that promotes the heat of vaporization and lowers the room temperature by supplying the mist into the house.

The house main body 3 is provided with a curtain 32 that can be opened and closed between a closed state that blocks external light incident from the roof portion and an open state that irradiates the crop 4 without blocking external light incident from the roof portion. ing. The curtain 32 is a light-shielding member having a function of adjusting the amount of solar radiation flowing into the house, and is used in combination with a cooling device or a heating device to keep the inside of the house cold or warm. The curtain 32 can divide the inside of the house into a crop space in which the crop 4 exists and a non-crop space in which the crop 4 does not exist in the closed state. Further, the roof portion of the house body 3 is provided with a skylight 30 that allows communication between the non-crop space and the outside of the house and can be opened and closed. By adjusting the opening amount of the skylight 30, it is possible to adjust the ventilation resistance and the ventilation amount of the air when taking in the outside air into the house. Further, a side window 31 that can be opened and closed is provided on the side wall portion of the house main body 3, and the opening amount of the side window 31 is adjusted to reduce the ventilation resistance or the ventilation amount of air when taking in outside air into the house. Can be adjusted. That is, the skylight 30 or the side window 31 is a window capable of controlling the airflow going back and forth inside and outside the house.

Each of the curtain 32, the skylight 30, and the side window 31 is driven by a power source such as a motor and controlled by the control device 2. When the curtain 32 is opened and closed, the amount of solar radiation flowing into the house from the outside is adjusted, and the rate of temperature rise can be adjusted with respect to the room temperature in the house. Therefore, the control device 2 controls to drive the curtain 32 in the closing direction when the temperature in the house is lowered, and to open the curtain 32 when the temperature in the house is raised. .. However, when used in combination with a heating device or when the outside air temperature is lower than room temperature, the control device 2 controls to close the curtain 32 to keep warm. The skylight 30 or the side window 31 is opened and closed so that the room temperature in the house approaches the target temperature in the daytime, and is closed at night or in winter, for example. The control device 2 adjusts the opening / closing amount of the skylight 30, the side window 31, the curtain 32, etc. according to the control index obtained from the measured values of the temperatures at a plurality of locations in the house main body 3, and targets the temperature environment in the house. Control to range.

By adjusting the opening amount of the skylight 30 or the side window 31, the speed at which outside air is taken into the house body 3 can be adjusted. Further, the skylight 30 or the side window 31 can adjust the temperature by taking in the outside air into the internal space of the house main body 3 and utilizing the temperature difference between the inside and outside of the house main body 3. For example, during summer or sunny days, the curtain 32 is closed and the opening amount of the skylight 30 or the side window 31 is largely controlled, thereby contributing to suppressing the rise in the room temperature of the house body 3.

The circulation fan 33 and the skylight 30 or the side window 31 constitute an airflow forming device in the agricultural house 1. Further, the skylight 30 or the side window 31 can independently form an airflow forming device even when the circulation fan 33 is not operating. That is, when the circulation fan 33 is operated and the skylight 30 or the side window 31 is open, the outside air can be forcibly taken into the inside of the house body 3 and an air flow including the outside air inflow can be formed in the house. .. When the skylight 30 or the side window 31 is open, outside air having a flow velocity of a certain level or higher can be taken into the inside of the house body 3 depending on the outside wind direction, and an air flow including the inflow of outside air can be formed in the house. The circulation fan 33 is thus used as an air flow forming device, and can be used not only for adjusting the room temperature or adjusting the humidity, but also for diffusing carbon dioxide in the house.

The agricultural house 1 includes a heat pump device 35 that functions as an air conditioner capable of supplying warm or cold air into the house. The main body of the heat pump device 35 is installed outside the house, and the air-conditioned air can be blown to an arbitrary predetermined position such as around the crop 4 through a duct extending from the main body. The ambient temperature of the crop 4 can be controlled by the conditioned air of the heat pump device 35.

The heat pump device 35 constitutes a cycle in which the refrigerant circulates in a circuit in which a plurality of heat exchangers, compressors, decompression devices and the like are connected by pipes in an annular shape. The heat pump device 35 functions as a temperature riser when the outside air heated by the heat radiating heat exchanger is blown as warm air by the heat radiating action of the refrigerant, and the outside air cooled by the cooling heat exchanger by the heat absorbing action of the refrigerant. When the air is blown as cold air, it functions as a temperature lowering device. The heat pump device 35 can also function as a dehumidifying device that absorbs moisture from the air in the house to dehumidify the inside of the house. When the heat pump device 35 performs the heating operation, the room temperature rises, so that the relative humidity in the house decreases. Therefore, the heat pump device 35 functions as a humidity adjusting device capable of adjusting the relative humidity in the house by the dehumidifying operation or the heating operation. The control device 2 controls the operation of the heat pump device 35 according to the control index obtained from the measured values at a plurality of locations in the house main body 3, and controls the temperature environment or the humidity environment in the house within the target range.

The agricultural house 1 includes a heater 36 capable of supplying warm air into the house. The heater 36 is an air conditioner capable of blowing warm air to a predetermined position such as around the crop 4. The heater 36 functions as a temperature raising device capable of raising the temperature around the crop 4 by the heating air. The heater 36 supplies air warmed by, for example, an electric heater, a hot water heater, a combustion heater, or the like into the house. When the heater 36 performs the heating operation, the room temperature rises, so that the relative humidity in the house decreases. Therefore, the heater 36 functions as a humidity adjusting device capable of adjusting the relative humidity in the house. The control device 2 controls the heater 36 so as to keep the room temperature around the crop 4 at a target temperature suitable for growth. The control device 2 controls the operation of the heater 36 and the like according to the control index obtained from the measured values at a plurality of locations in the house main body 3, and controls the temperature environment or the humidity environment in the house within the target range.

The agricultural house 1 includes a dehumidifier 40 capable of dehumidifying the air in the house. When the dehumidifier 40 operates, the relative humidity in the house decreases, so that the dehumidifier 40 functions as a humidity adjusting device capable of adjusting the relative humidity in the house. The control device 2 controls the operation of the dehumidifier 40 according to the control index obtained from the measured values at a plurality of locations in the house main body 3, and controls the humidity environment in the house within the target range.

The agricultural house 1 includes a carbon dioxide gas generator 39 that supplies carbon dioxide into the house. The control device 2 controls the carbon dioxide generator 39 so as to appropriately maintain the carbon dioxide concentration in the house, particularly around the crop 4, in order to promote photosynthesis. The control device 2 operates, for example, a carbon dioxide gas generator 39 at a predetermined time of the day to adjust the carbon dioxide concentration in the house to a target value. Therefore, the carbon dioxide gas generator 39 is a photosynthesis promoting device. The control device 2 controls the operation of the carbon dioxide gas generator 39 according to the control index obtained from the measured values of the carbon dioxide concentration at a plurality of points in the house main body 3, and sets the carbon dioxide concentration environment in the house as the target range. Control.

The agricultural house 1 includes a plurality of various sensors for measuring environmental information related to the growth of the crop 4. The various sensors include, for example, a wind direction sensor 50, a wind speed sensor 51, a solar radiation sensor 52, a raindrop sensor 53, an outdoor temperature sensor 54, an outdoor humidity sensor 55, an indoor temperature sensor 56, 59, an indoor humidity sensor 57, 60, and the like. It is an environmental sensor in an agricultural house 1 including a carbon dioxide sensor 58 and the like.

The wind direction sensor 50 detects the wind direction of the house body 3 outdoors. The wind direction information detected by the wind direction sensor 50 is input to the control device 2 and used as the wind direction for the skylight 30 and the side window 31 for controlling the opening degree of these windows. The wind speed sensor 51 detects the wind speed of the house body 3 outdoors. The wind speed information detected by the wind speed sensor 51 is input to the control device 2 and used as the wind speed for the skylight 30 or the side window 31 for controlling the opening degree of these windows.

The solar radiation sensor 52 detects the amount of solar radiation that falls on the house body 3. The solar radiation amount information detected by the solar radiation sensor 52 is input to the control device 2 and used for estimating the amount of heat flowing into the house, and is used for opening / closing control of the curtain 32 and room temperature control. The detected amount of solar radiation can also be used to determine whether it is rainy or nighttime and sunny daytime.

The raindrop sensor 53 is a rain detection sensor provided outside the house body 3 that can detect the presence or absence of rainfall. The raindrop sensor 53 is, for example, a sensor that detects rain adhering to the panel as moisture, and detects electrical resistance between predetermined electrodes. The detected value of the electric resistance is input to the control device 2, and the control device 2 determines that it is currently raining when the detected value is equal to or less than a certain resistance value. Further, the raindrop sensor 53 may be a sensor that detects rain adhering to the panel as water pressure. In this case, the pressure detected by the raindrop sensor 53 is input to the control device 2, and the control device 2 determines that it is currently raining when the detected value is equal to or higher than a certain pressure value.

The temperature sensor 54 detects the temperature of the outside air outside the house body 3 and sends it to the control device 2. The humidity sensor 55 detects the humidity of the outside air outside the house body 3 and sends it to the control device 2. The plurality of temperature sensors 56 detect the temperature of the air in the crop space in the room of the house body 3, for example, the temperature around the crop 4, and send this temperature environment value to the control device 2. The plurality of humidity sensors 57 detect the humidity of the air in the crop space in the room of the house body 3, for example, the humidity around the crop 4, and send this humidity environment value to the control device 2. The plurality of carbon dioxide sensors 58 are carbon dioxide concentration detecting means for detecting the carbon dioxide concentration in the air in the crop space in the room of the house body 3, for example, the carbon dioxide concentration around the crop 4, and control the carbon dioxide environmental value. Send to device 2. The temperature sensor 59 detects the temperature of the air in the non-crop space in the room of the house main body 3 and sends this temperature environment value to the control device 2. The humidity sensor 60 detects the humidity of the air in the non-crop space in the room of the house main body 3 and sends this humidity environment value to the control device 2.

The environment in which the crop 4 grows in the house body 3 is changed by controlling various temperature control devices, humidity control devices, air volume control devices, carbonic acid concentration control devices, water supply control devices, solar radiation control devices, and the like. As described above, the temperature control device includes a skylight 30, a side window 31, a curtain 32, a circulation fan 33, a mist generator 34, a heat pump device 35, a heater 36, etc., which can be controlled to adjust the room temperature in the house. Can be configured. The humidity control device can be composed of a mist generator 34, a heat pump device 35, a heater 36, a dehumidifier 40, and the like that can be controlled to adjust the relative humidity in the house. The air volume adjusting device can be configured by a skylight 30, a side window 31, a circulation fan 33, and the like that can be controlled to form an air flow in the house.

Further, the carbon dioxide concentration adjusting device can be configured by a carbon dioxide gas generator 39 or the like controlled for adjusting the carbon dioxide concentration in the house. Further, the water supply adjusting device can be configured by a water supply machine 37 or the like controlled for adjusting the water supply to the crop 4. Further, the solar radiation amount adjusting device can be configured by a curtain 32 or the like that can be controlled to adjust the solar radiation amount flowing into the house.

The control device 2 adjusts the water supply pressure of the water supply device 37, opens and closes the curtain 32, adjusts the opening amount of the skylight 30 and the side window 31, a circulation fan 33, a mist generator 34, a carbon dioxide gas generator 39, a heater 36, and the like. And the operation and stop of each of the heat pump device 35 are controlled. To start and stop energizing each adjusting device, an electromagnetic relay that turns on and off the power supply to each device is used. The control device 2 is housed in a housing installed inside the house body 3 or outside the house body 3.

The control device 2 includes a device such as a microcomputer that operates according to a program as a main hardware element. The control device 2 includes an interface unit (hereinafter, also referred to as an I / F unit) 20 for connecting each of the above-mentioned adjustment devices and various sensors, an arithmetic processing unit 21, and a storage unit 22 for storing various data. Be prepared. The arithmetic processing unit 21 performs prediction processing or arithmetic processing according to a predetermined program using environmental information acquired from various sensors through the I / F unit 20 and various data stored in the storage unit 22. The arithmetic processing unit 21 sets a timer for standby processing before the start of the operation and after the end of the operation. The arithmetic processing unit 21 is a prediction unit and an arithmetic processing unit in the control device 2. The I / F unit 20 operates each of the above-mentioned adjustment devices based on the prediction result and the calculation result by the calculation processing unit 21. Therefore, the I / F unit 20 is an input unit and a control unit in the control device 2.

Further, a terminal device serving as a user interface, for example, a personal computer 23, a control panel, a portable terminal, or the like is connected to the I / F unit 20. The user can set the environment such as room temperature in the house, set the time, etc. using the operation panel of the control device 2, the operation unit of the personal computer 23, the control panel, the terminal device, etc., and display the terminal device. You can check the current operating status through the screen.

[2. process]
The dew condensation suppression process executed by the control device 2 will be described with reference to the flowchart of FIG. This dew condensation suppression treatment is performed in parallel with the environmental control in the house, which is always carried out to promote the growth of the crop 4. When the control device 2 constantly detects the temperature and humidity of the air in the crop space and the temperature and humidity of the outside air and determines that it is necessary to suppress direct dew condensation on the surface of the crop 4. In order to prevent the occurrence of dew condensation, a predetermined device is controlled to a predetermined operating state. The external air referred to here is the outside air based on the crop space, specifically, the air in the non-crop space and the air outside the house. The dew condensation suppression treatment is always executed if the agricultural house 1 is in a state where the crop 4 is growing. Specifically, the dew condensation suppression treatment is repeated at predetermined time intervals.

In S10, the control device 2 initializes the stored data and the like after the start-up.
In S11, the control device 2 inputs environmental information from each sensor and the state of various adjusting devices. In the present embodiment, the control device 2 inputs at least the humidity of the external air and the temperature of the air in the crop space as environmental information, and the states of the skylight 30 and the curtain 32 as the states of various adjusting devices. As the humidity of the external air, a value detected by the humidity sensor 55 or the humidity sensor 60 is used. The value detected by the temperature sensor 56 is used for the temperature of the air in the crop space. Information on either fully closed or open is used for the states of the skylight 30 and the curtain 32.

In S12, the control device 2 executes arithmetic processing.
Here, the specific contents of the arithmetic processing will be described with reference to the flowchart of FIG. The arithmetic processing determines the output of various adjustment devices in order to control the indoor environment in the house based on the information input in S11.

In S120, the control device 2 performs various operations based on the information input in S11. For example, the control device 2 calculates the dew point temperature of the external air from the humidity of the external air. Further, the control device 2 calculates the absolute humidity corresponding to the relative humidity of 100% of the air temperature in the crop space from the temperature of the air in the crop space.

Subsequently, in S121, the control device 2 executes the dew condensation prediction process.
Here, the specific contents of the dew condensation prediction process will be described with reference to the flowchart of FIG.

In S210, the control device 2 determines whether or not a dew condensation prediction is required to predict whether dew condensation will occur directly on the surface of the crop 4. Specifically, when the control device 2 intends to control the skylight 30 or the curtain 32 to the open state, the control device 2 will control the skylight 30 and the curtain 32 to the open state and the skylight 32 to the open state as shown in FIG. Based on the controlled object to be controlled, it is determined whether or not dew condensation prediction is necessary. If the control device 2 does not control the skylight 30 or the curtain 32 in the open state, the control device 2 determines that dew condensation prediction is not necessary. The details are as follows.

If the condition of the following (1) is satisfied, it is determined that the dew condensation prediction is not necessary. This is because since the curtain 32 is fully closed, even if the skylight 30 is controlled to be open, the outside air does not flow into the crop space, and there is little concern that dew condensation will occur directly on the surface of the crop 4.

(1) The skylight 30 and the curtain 32 are both fully closed, and the control target is the skylight 30.
On the other hand, if any of the following conditions (2) to (5) is satisfied, it is determined that dew condensation prediction is necessary. This is because when the controlled object is controlled to be in an open state, external air may flow into the crop space and dew condensation may occur directly on the surface of the crop 4. The control of inflowing external air into the crop space in this way is hereinafter referred to as "inflow control".

(2) and (3) The skylight 30 and the curtain 32 are both fully closed, and the control target is the curtain 32.
(4) The state of the skylight 30 is open, the state of the curtain 32 is fully closed, and the control target is the curtain 32.

(5) The state of the skylight 30 is fully closed, the state of the curtain 32 is open, and the control target is the skylight 30.
When the control device 2 determines in S210 that the dew condensation prediction is not necessary, the control device 2 shifts the process to S213.

On the other hand, when the control device 2 determines in S210 that dew condensation prediction is necessary, the control device 2 shifts the process to S211.
In S211 in order to predict whether or not dew condensation occurs directly on the surface of the crop 4, the control device 2 determines whether or not the temperature of the air in the crop space is equal to or lower than the dew point temperature of the external air, specifically, ". It is determined whether or not the dew point temperature of the external air-the temperature of the air in the crop space ≥ the predetermined set value. Whether or not the absolute humidity of the outside air is equal to or higher than the absolute humidity corresponding to the relative humidity of the air temperature in the crop space at 100%, specifically, "absolute humidity of the outside air-relative to the temperature of the air in the crop space". It is determined whether or not "absolute humidity corresponding to 100% humidity ≥ a predetermined set value". The above-mentioned two predetermined set values are 0 or more, and may be different values or the same values.

Here, "external air dew point temperature-crop space air temperature ≥ predetermined set value" and "absolute humidity of external air-absolute humidity corresponding to 100% relative humidity of the crop space air temperature". When “≧ predetermined set value”, it is predicted that dew condensation will occur directly on the surface of the crop 4. When the inflow control is executed when the temperature of the outside air is warmer than the temperature of the air in the crop space, the outside air flowing into the crop space comes into contact with the crop 4 and the inflow control is performed in the crop space before the inflow control is executed. It is cooled to near the temperature of the air. As a result, the temperature of the inflowing external air drops to the dew point temperature or lower, and the relative humidity of the inflowing external air rises to 100%. Therefore, there is a high possibility that dew condensation will occur directly on the surface of the crop 4.

On the other hand, it is not "external air dew point temperature-crop space air temperature ≥ predetermined set value", or "absolute humidity of external air-absolute humidity corresponding to 100% relative humidity of crop space air temperature ≥ predetermined" If it is not "the set value of", it is predicted that dew condensation will not occur directly on the surface of the crop 4. When the inflow control is executed in a state where the temperature of the outside air is lower than the temperature of the air in the crop space, the outside air flowing into the crop space comes into contact with the crop 4 and the inflow control is performed in the crop space before the inflow control is executed. It can be warmed up to near the temperature of the air. As a result, the temperature of the inflowing external air does not drop below the dew point temperature, or the relative humidity of the inflowing external air does not rise to 100%. Therefore, it is unlikely that dew condensation will occur directly on the surface of the crop 4.

As the temperature of the air in the crop space adopted by the control device 2 in S211th, the measured value which is the lower temperature among the plurality of measured values is used. Further, as the absolute humidity corresponding to the relative humidity of 100% of the air in the crop space adopted by the control device 2 in S211th, the measured value which is the lower absolute humidity among the plurality of measured values is used. Then, as shown in FIG. 6, whether the control device 2 adopts the dew point temperature and the absolute humidity of the air in the non-crop space or the air outside the house as the dew point temperature and the absolute humidity of the outside air in S211 is shown in FIG. It is determined by the state of the sky window 30 and the curtain 32, the control target to be controlled to the open state, and the presence / absence of the temperature sensor 59 and the humidity sensor 60 for measuring the temperature and humidity of the air in the non-crop space.

Specifically, since the agricultural house 1 of the present embodiment includes a temperature sensor 59 and a humidity sensor 60 for detecting the dew point temperature and the absolute humidity of the air in the non-crop space, the sky window 30 and the curtain 32 have. When the states are all fully closed and the control target is the curtain 32, the condition of (2) shown in FIG. 6 is satisfied. Therefore, as the dew point temperature and absolute humidity of the outside air, the dew point temperature and absolute humidity of the air in the non-crop space are adopted. On the other hand, if the agricultural house 1 is not provided with the temperature sensor 59 and the humidity sensor 60, the skylight 30 and the curtain 32 are both fully closed, and the control target is the curtain 32. The condition of (3) shown in 6 is satisfied. Therefore, the dew point temperature and the absolute humidity of the air outside the house are adopted as the dew point temperature and the absolute humidity of the outside air. When the condition of (4) or (5) shown in FIG. 6 is satisfied, the dew point temperature and the absolute humidity of the air outside the house are adopted as the dew point temperature and the absolute humidity of the outside air.

In S211 the control device 2 determines that the temperature of the air in the crop space is equal to or lower than the dew point temperature of the outside air, and the absolute humidity of the outside air corresponds to an absolute humidity of 100% of the temperature of the air in the crop space. If it is determined that the humidity is higher than the humidity, the process is shifted to S212.

In S212, since there is a high concern that dew condensation will occur directly on the surface of the crop 4, the control device 2 will end the dew condensation prediction process of FIG. 5 after prohibiting inflow control.
On the other hand, in at least one of the control devices 2, the temperature of the air in the crop space is not equal to or lower than the dew point temperature of the external air, or the absolute humidity of the external air is equal to or higher than the absolute humidity corresponding to 100% relative humidity of the temperature of the air in the crop space. If it is determined that this is not the case, the process is transferred to S213.

In S213, since there is little concern that dew condensation will occur directly on the surface of the crop 4, the control device 2 will end the dew condensation prediction process of FIG. 5 after permitting inflow control.
Returning to FIG. 4, in S122, the control device 2 executes the dew condensation prevention process.

Here, the specific contents of the dew condensation prevention treatment will be described with reference to the flowchart of FIG. 7.
In S220, the control device 2 determines whether or not dew condensation is predicted to occur in the dew condensation prediction process.

If the control device 2 determines that dew condensation is not predicted to occur in S220, the control device 2 shifts to S223.
On the other hand, when the control device 2 determines that dew condensation is predicted to occur in S220, the control device 2 shifts to S221.

In S221, the control device 2 determines whether or not the temperature of the air in the crop space is equal to or lower than a predetermined temperature. In order to suppress direct dew condensation on the surface of the crop 4, it is necessary to raise the temperature of the air in the crop space to be higher than the dew point temperature of the outside air. Therefore, the predetermined temperature is set to a temperature obtained by adding a value that can be set by the user to the dew point temperature of the external air. The reason why the value that can be set by the user is added is that an error in the calculation of the dew point temperature is taken into consideration. In S221, the control device 2 uses the measured value of the air temperature in the crop space, which is the lower temperature among the plurality of measured values, and the dew point temperature of the external air adopted in the above-mentioned S211.

When the control device 2 determines in S221 that the temperature of the air in the crop space is equal to or lower than a predetermined temperature, the control device 2 shifts to S222.
In S222, since the control device 2 needs heating for the purpose of directly preventing dew condensation on the surface of the crop 4, the dew condensation prevention process of FIG. 7 is terminated after requesting the start of operation of the heater 36.

On the other hand, when the control device 2 determines in S221 that the temperature of the air in the crop space is not equal to or lower than the predetermined temperature, the control device 2 shifts to S223.
In S223, since the control device 2 does not require heating for the purpose of directly preventing dew condensation on the surface of the crop 4, the dew condensation prevention process of FIG. 7 is terminated after requesting the shutdown of the heater 36.

Returning to FIG. 4, in S123, the control device 2 makes a comprehensive determination based on the results of the dew condensation prediction process and the dew condensation prevention process, and determines various outputs. For example, the control device 2 controls the skylight 30 or the curtain 32 so as not to open when the inflow control is prohibited in S212, so that the absolute humidity of the air in the crop space is not increased. Further, when the inflow control is permitted in S213, the control device 2 controls the skylight 30 or the curtain 32 based on the normal environmental control. Further, the control device 2 actually controls the heater 36 to raise the temperature of the air in the crop space in accordance with the request for starting the operation of the heater 36 of S222, so that the heater 36 controls the outside air. Raise the temperature of the air in the crop space so that it is higher than the dew point temperature. Further, the control device 2 controls to raise the temperature of the air in the crop space when it is desired to raise the temperature of the air in the crop space even when the operation of the heater of S223 is requested to be stopped. May be good.

After determining various outputs in S123, the control device 2 ends the arithmetic processing shown in FIG.
Returning to FIG. 3, in S13, the control device 2 outputs the determination result of dew condensation prediction, the status of various adjusting devices, the standby information by the timer, etc. so that the user can confirm it, and then returns the process to S11 to perform dew condensation suppression control. repeat.

[3. effect]
According to the embodiment described in detail above, the following effects can be obtained.
(3a) In the present embodiment, it is determined that the temperature of the air in the crop space is equal to or lower than the dew point temperature of the outside air, and the absolute humidity of the outside air corresponds to 100% relative humidity of the air temperature in the crop space. If it is determined that the humidity is higher than the humidity, inflow control is prohibited.

According to such a configuration, inflow control is prohibited when it is predicted that dew condensation will occur directly on the surface of the crop 4. On the other hand, in a situation where dew condensation is unlikely to occur directly on the surface of the crop 4, inflow control is likely to be performed. As a result, it is possible to maintain the environment for promoting the growth of the crop 4 for a long time while suppressing the direct dew condensation on the surface of the crop 4.

(3b) In the present embodiment, the agricultural house 1 is provided with a humidity sensor 60 for detecting the humidity of the air in the non-crop space. As a result, when the condition of (2) described above is satisfied, specifically, when the control of changing the curtain 32 from the closed state to the open state while maintaining the closed state of the skylight 30 is executed as the inflow control, the crop space. It is possible to predict whether dew condensation will occur directly on the surface of the crop 4 based on the accurate measurement value of the humidity of the air flowing into the crop 4. Therefore, it is possible to optimize the timing of opening the curtain 32 in the environmental control for promoting the growth.

(3c) In the present embodiment, the agricultural house 1 is provided with a humidity sensor 60 for detecting the humidity of the air in the non-crop space, but the above-mentioned is described even if the configuration is not provided with the humidity sensor 60 (3c). If the condition of 3) is satisfied, it is possible to predict whether dew condensation will occur directly on the surface of the crop 4 based on the measured value of the humidity of the air outside the house instead of the air in the non-crop space. According to such a configuration, the agricultural house 1 can be configured at a lower cost as compared with the configuration provided with the humidity sensor 60.

(3d) In the present embodiment, when it is predicted that dew condensation will occur directly on the surface of the crop 4 and it is determined that the temperature of the air in the crop space is equal to or lower than the predetermined temperature, the temperature inside the house will be increased. Is required to start the operation of the heater. Thereby, by executing the inflow control, the temperature of the air in the crop space can be adjusted so that dew condensation does not directly occur on the surface of the crop 4.

(3e) In the present embodiment, it is output so that the user can confirm whether or not the dew condensation is predicted. Therefore, the user can adjust various adjustment devices in consideration of the influence on the crop 4.
In the present embodiment, S123 corresponds to the processing as the control unit, S211 corresponds to the processing as the prediction unit, S221 corresponds to the processing as the temperature determination unit, and S122 corresponds to the processing as the requesting unit. do.

[4. Other embodiments]
Although the embodiments of the present disclosure have been described above, it is needless to say that the present disclosure is not limited to the above-described embodiments and can take various forms.

(4a) In the above embodiment, when the skylight 30 and the curtain 32 are both fully closed and the control target is the skylight 30, a configuration in which dew condensation is not predicted is exemplified. For example, the air outside the house is illustrated. The dew condensation may be predicted based on the dew point temperature and the absolute humidity. According to such a configuration, when the degree of sealing of the curtain 32 is low, the control device 2 can prevent the skylight 30 from opening despite the concern of dew condensation.

(4b) In the above embodiment, the temperature sensor 59 and the humidity sensor 60 for detecting the dew point temperature and the absolute humidity of the air in the non-crop space are provided, and the states of the sky window 30 and the curtain 32 are both fully closed and controlled. When the target is the curtain 32, the dew point temperature and absolute humidity of the air in the non-crop space are adopted as the dew point temperature and absolute humidity of the outside air, but for example, the dew point temperature and absolute humidity of the air outside the house are adopted. It may be configured.

(4c) In the above embodiment, the information of either fully closed or open is used for the state of the skylight 30 and the curtain 32, but the fully closed state in the closed state is, for example, a slightly open state. It may be a fully closed state and a configuration that can be set.

(4d) In the above embodiment, the temperature sensor 56 and the humidity sensor 57 are installed at two predetermined locations in the house, but the installation locations are not limited to these. For example, the temperature sensor 56 and the humidity sensor 57 may be installed at one place or at three or more places.

(4e) The user may be able to set a standard for the necessity of dew condensation prediction in the dew condensation prediction process. For example, as compared with the crop 4 such as tomato having a high heat capacity, the crop 4 having a low heat capacity can follow a sudden temperature change due to the execution of inflow control. Therefore, it is unlikely that dew condensation will occur directly on the surface of the crop 4. Therefore, for example, when cultivating a crop 4 having a low heat capacity, it is necessary to control the dew condensation suppression by setting that the user does not need the dew condensation prediction for at least a part of the conditions for which the dew condensation prediction was required in the above embodiment. The configuration can be made more difficult to execute.

(4f) The functions of one component in the above embodiment may be dispersed as a plurality of components, or the functions of the plurality of components may be integrated into one component. Further, a part of the configuration of the above embodiment may be omitted. Further, at least a part of the configuration of the above embodiment may be added or substituted with respect to the other configurations of the above embodiment. It should be noted that all aspects included in the technical idea specified from the wording described in the claims are embodiments of the present disclosure.

(4g) In addition to the above-mentioned control device, the present disclosure includes a system having the control device as a component, a program for operating a computer as the control device, a medium on which this program is recorded, a dew condensation suppression control method, and the like. It can be realized in the form of.

1 ... Agricultural house, 2 ... Control device, 3 ... House body, 4 ... Crop, 20 ... I / F unit, 21 ... Arithmetic processing unit, 22 ... Storage unit, 23 ... Personal computer, 30 ... Sky window, 31 ... Side Windows, 32 ... curtains, 33 ... circulation fans, 34 ... mist generators, 35 ... heat pump devices, 36 ... heaters, 37 ... water dispensers, 38 ... beds, 39 ... carbon dioxide generators, 40 ... dehumidifiers, 50 ... Wind direction sensor, 51 ... wind speed sensor, 52 ... solar radiation sensor, 53 ... raindrop sensor, 54,56,59 ... temperature sensor, 55,57,60 ... humidity sensor, 58 ... carbon dioxide sensor.

Claims (6)

It is a control device (2) that controls the indoor environment inside the house in the agricultural house (1) for growing the crop (4).
A control unit (S123) capable of executing inflow control for inflowing external air, which is air outside the crop space, into the crop space in which the crop exists inside the house.
A prediction unit (S211) that predicts whether dew condensation will occur on the crop due to the inflow control, and
Equipped with
The prediction unit determines that the temperature of the air in the crop space is equal to or lower than the dew point temperature of the outside air, and the absolute humidity of the outside air corresponds to 100% relative humidity of the air temperature in the crop space. If it is determined that the humidity is above the absolute humidity, it is predicted that dew condensation will occur on the crop.
The control unit is a control device that prohibits the inflow control when it is predicted that dew condensation will occur by the prediction unit. The control device according to claim 1.
The control unit has a curtain (32) capable of dividing the inside of the house into a crop space and a non-crop space in which the crop does not exist, and a window (32) capable of communicating the non-crop space with the outside of the house. 30), the control of changing at least one of them from the closed state to the open state can be executed as the inflow control.
The prediction unit is a control device that predicts whether dew condensation will occur on the crop by using the air in the non-crop space or the air outside the house as the outside air. The control device according to claim 2.
When the control unit keeps the window closed and changes the curtain from the closed state to the open state as the inflow control, the prediction unit uses the air in the non-crop space as the external air. , A control device that predicts whether dew condensation will occur on the crop based on the measured value of the humidity of the air in the non-crop space. The control device according to claim 2.
When the control unit keeps the window closed and changes the curtain from the closed state to the open state as the inflow control, the prediction unit uses the air outside the house as the external air. A control device that predicts whether or not dew condensation will occur on the crop based on the measured value of the humidity of the air outside the house. The control device according to any one of claims 1 to 4.
A temperature determination unit (S221) for determining whether or not the temperature of the air in the crop space is equal to or lower than a predetermined temperature,
When the prediction unit predicts that dew condensation will occur on the crop and the temperature determination unit determines that the temperature is below the predetermined temperature, the operation of the heater capable of supplying warm air to the inside of the house is started. The request unit (S122) required from the control unit and
Further equipped with a control device. An agricultural house (1) that controls the indoor environment inside the house in order to grow crops (4).
A curtain (32) that can be opened and closed between a closed state that shields external light incident from the outside of the house and an open state that irradiates the crop without blocking external light.
A window (30) capable of controlling the amount of airflow to and from the inside and outside of the house, and
The control device (2) according to any one of claims 1 to 5, and the control device (2).
Agricultural house with.

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