JP2019097439A - Controller and agriculture house - Google Patents

Abstract

To provide a controller and an agriculture house capable of suppressing direct dew condensation to a surface of a crop, and maintaining an environment for raising promotion of a crop for a long period.SOLUTION: A controller controls an indoor environment in a house, in an agriculture house for raising crops. The controller can execute inflow control for making external air which is air in an external environment of a crop space flow into a crop space where crops in the house exist. In S211, the controller predicts whether or not dew condensation occurs on crops by the inflow control. If the controller determines that, temperature of air in the crop space is equal to or less than a dew point temperature of the external air, and absolute humidity of the external air is equal to or more than absolute humidity corresponding to a relative humidity 100% time of the temperature of air in the crop space, the controller predicts that the dew condensation occurs on the crops, in S211. In the dew condensation suppression processing, the controller shifts processing to S212 if it is predicted that the dew condensation occurs in S211, then inhibits the inflow control.SELECTED DRAWING: Figure 5

Description

  The present disclosure relates to agricultural houses.

  An agricultural house is known in which the indoor environment inside the house is controlled to grow crops. In such an agricultural house, dew condensation may adhere to the surface of the crop, which may cause deterioration of the crop quality. The reference 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 it is necessary to suppress condensation.

Unexamined-Japanese-Patent No. 2017-112916

  However, in the above-described control device, control is performed to suppress condensation in the case where condensation occurs in the house and in the case where condensation occurs on the crop, so the temperature and humidity suitable for promoting the growth of the crop are controlled. Environmental control for meeting etc was sacrificed. That is, even in a situation where condensation is hard to occur directly on the surface of the crop, control to suppress condensation has been carried out, so there were cases in which the environment for promoting crop cultivation could not be maintained for a long time.

  One aspect of the present disclosure is to provide a control device and an agricultural house capable of maintaining an environment for promoting crop growth for a long time while suppressing direct condensation on the surface of the crop. .

  One aspect of the present disclosure is a control device (2) for controlling an indoor environment inside a house in an agricultural house (1) for growing a crop (4), comprising: a control unit (S123); And (S211). The control unit can execute inflow control to cause the outside air, which is the air outside the crop space, to flow into the crop space where the crop is present inside the house. The prediction unit predicts whether condensation will occur on the crop due to inflow control. 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% relative humidity of the air temperature of the crop space If it is determined, it is predicted that condensation will occur on the crop. The control unit prohibits inflow control when it is predicted by the prediction unit that condensation will occur.

  According to such a configuration, inflow control is prohibited when condensation is predicted to occur directly on the surface of the crop. On the other hand, in a situation where condensation does not easily occur directly on the surface of the crop, inflow control is facilitated. Therefore, while suppressing direct condensation on the surface of the crop, it is possible to maintain an environment for promoting crop cultivation for a long time.

It is the outline figure shown about the house for agriculture, and its control composition. It is the schematic which showed an example of the installation location of the temperature sensor in the house which carried out planar view, and a humidity sensor. It is a flow chart of dew condensation control processing. It is a flowchart of arithmetic processing. It is a flowchart of condensation prediction processing. It is a figure which shows the control object which it is going to control to the state of a skylight and a curtain, and an open state. It is a flowchart of condensation prevention processing.

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

  The agricultural house 1 includes various sensors for measuring wind direction, wind speed, sunshine, presence of precipitation, temperature in the house, humidity, carbon dioxide concentration, etc., opening / closing of skylights or curtains of the house, control of air conditioner, generation of mist And various control devices for generating carbon dioxide and the like, and the control device 2. The control device 2 outputs control signals corresponding to control indexes obtained from measurement values at a plurality of locations related to the indoor environment in the house main body 3 to various adjustment devices, and the growth environment of the crop 4 is Control automatically to be optimal. The measured values regarding the indoor environment provided at a plurality of locations are detected values of the temperature sensor and the humidity sensor. Thus, the temperature sensor and the humidity sensor detect their respective measured values at different points in the house.

  The agricultural house 1 is an example for controlling the inside of the house to an appropriate environment for growing, and when the condition that condensation is likely to occur directly on the surface of the crop 4 is established, condensation does not easily occur in the environment of the house Implement condensation suppression control to improve the situation. According to this condensation suppression control, it is possible to avoid a situation that may adversely affect the growth of the crop 4. Also, for example, when the crop 4 is a tomato etc., an air conditioning management system capable of promoting photosynthesis and increasing yield by automatically controlling temperature, carbon dioxide concentration and the like in greenhouse cultivation of tomatoes when the agricultural house 1 is a greenhouse etc. It is also.

  The house body 3 includes, for example, a frame configured by combining metal members as structural members, and a covering material supported by the frame. As the covering material, a translucent synthetic resin film or glass is used. Although the house main body 3 shown in FIG. 1 integrally includes a gable-like roof portion and two sets of side wall portions supporting the roof portion and facing each other, this form is an example, and the house main body 3 It does not mean to limit the composition of Moreover, it does not prevent using the other material for the house main body 3 or forming in another shape.

  The crop 4 is grown on the use soil in a predetermined container such as a bed 38 provided in the house main body 3. The crop 4 is grown by absorbing nutrients from the soil by supplying a nutrient solution containing water and fertilizer to the soil through the pipe by the water feeder 37. For example, as shown in FIG. 2, a predetermined number of beds 38 are arranged in a row at equal intervals in a house, as shown in FIG.

  The water supplier 37 is a water supply pump controlled by the control device 2. The control device 2 operates the water feeder 37 during a predetermined time of day, and supplies the target amount of nutrient solution to the storage soil. The control device 2 controls the water feeder 37 so as to adjust the amount of nutrient solution supplied to the target amount in accordance with 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 in the house main body 3. The circulation fan 33 is controlled by the control device 2 to circulate the gas in the house main body 3 and distribute it throughout. Thus, the circulation fan 33 constitutes an air flow forming device that forms an air flow in the house main body 3 and around the crop 4, and promotes adjustment of humidity, temperature, carbon dioxide concentration, etc. in the house. It also contributes to promoting growth. Further, the circulating fan 33 is preferably installed in a form capable of selecting an air flow in the house, and is movable by being fixed to a rail or the like extending horizontally or longitudinally in the house, for example. Is preferred.

  The control device 2 obtains a control index using the respective measurement values of the temperature sensor 56, the humidity sensor 57, and the carbon dioxide sensor 58 provided in plural. The control device 2 operates the circulating fan 33 according to the control index obtained from the measurement values at a plurality of locations in the house main body 3 to raise or lower the room temperature in the house, or to increase the carbon dioxide concentration or the humidity in the house. Control is performed to make the inside uniform. The control device 2 determines the control index by, for example, an operation for obtaining the maximum value, the minimum value, the difference, the average value and the like for a plurality of measurement values.

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

  The plurality of temperature sensors 56 and the plurality of humidity sensors 57 form a location where airflow is difficult to be formed, such as near four corners or side walls in a house viewed from a plane, a location where air flow tends to stagnate easily, and a relatively airflow such as the center It is installed in both a place where it is easy to For this reason, the temperature sensor 56 and the humidity sensor 57 contribute to global environmental control of the inside of the house in multiple perspectives. The control device 2 determines the control index by the above-described calculation using the measured values 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 in the house. The mist tube is provided with a plurality of nozzles attached to the wall of the tube through which water flows, and is configured to spray water from the nozzle by adjusting the pressure flowing through the tube by a pump or the like There is. Therefore, since the mist tube spouts water in the form of mist, the mist can be dropped from the upper part in the house in a relatively long time, and the humidity in the house can be gradually raised. Furthermore, by operating the circulation fan 33 together with the spray of the mist by the mist generator 34, the mist can be quickly spread in the house, and the rise of the humidity can be accelerated.

  The mist generator 34 is controlled by the controller 2. For example, the control device 2 operates the mist generator 34 in a predetermined time zone of one day to eject a mist of a target amount, and performs control so that the humidity environment in the house becomes a target range. The control device 2 controls the humidity environment in the house within a target range by adjusting the spray amount of the mist by the mist generator 34 according to the control index obtained from the measured values of the humidity at a plurality of locations in the house.

  Further, the control device 2 controls the mist generator 34 so as to adjust the fog supply amount to the target amount in accordance with the solar radiation amount 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 in the house and performs control to increase the relative humidity. The mist generator 34 is operated mainly when humidification is performed, but can also be operated as a temperature reduction device which accelerates the heat of vaporization to lower the room temperature by supplying the mist into the house.

  The house main body 3 is provided with a curtain 32 which can be opened and closed between a closed state in which external light entering from the roof is blocked and an open state in which the crop 4 is irradiated without blocking external light entering from the roof ing. The curtain 32 is a light blocking 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 cool or heat the inside of the house. The curtain 32 can divide the interior of the house into a crop space in which the crop 4 is present and a non-crop space in which the crop 4 is not present in the closed state. Furthermore, the roof portion of the house body 3 is provided with a skylight 30 which can be communicated between the non-crop space and the outside of the house and which can be opened and closed. By adjusting the opening amount of the skylight 30, it is possible to adjust the air flow resistance and the air flow rate of the air when taking in the outside air into the house. Further, the side wall 31 of the house main body 3 is provided with a side window 31 which can be opened and closed, and the opening amount of the side window 31 is adjusted to control the air flow resistance or the air flow rate when taking in the outside air into the house. It can be adjusted. That is, the skylight 30 or the side window 31 is a window capable of controlling the air flow moving in and out of 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 the curtain 32 to be driven in the closing direction when the temperature in the house is lowered, and to drive the curtain 32 in the opening direction when the temperature in the house is raised. . However, when using together with a heating apparatus, or when external temperature is lower than room temperature, the control apparatus 2 is controlled to close the curtain 32, and heat retention is performed. For example, 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 in the nighttime or winter. The control device 2 adjusts the opening / closing amount of the skylight 30, the side window 31, the curtain 32 and the like according to the control index obtained from the measured values of the temperature at a plurality of locations in the house main body 3 to target the temperature environment in the house. Control to the range.

  By adjusting the opening amount of the skylight 30 or the side window 31, it is possible to adjust the speed at which the outside air is taken into the house body 3. Moreover, the skylight 30 or the side window 31 can adjust the temperature using the temperature difference between the inside and the outside of the house body 3 by taking the outside air into the internal space of the house body 3. For example, by closing the curtain 32 and controlling the opening amount of the skylight 30 or the side window 31 largely in summer or fine daytime, it contributes to suppressing the rise of the room temperature of the house body 3.

  The circulation fan 33 and the skylight 30 or the side window 31 constitute an air flow forming device in the agricultural house 1. Moreover, the skylight 30 or the side window 31 can also constitute an airflow forming device independently 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 main 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, depending on the external wind direction, the outside of the house 3 can be taken in the outside air having a flow velocity above a certain level, and an air flow including outside air inflow 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 to adjust the room temperature or adjust the humidity but also to diffuse 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 air or cold air into the house. The heat pump device 35 has its main body installed outside the house, and can blow the conditioned air at any predetermined position such as the periphery of the crop 4 via a duct extending from the main body. The temperature around the crop 4 can be controlled by the air conditioning wind 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, a compressor, a pressure reducing device, and the like are annularly connected by piping. The heat pump device 35 functions as a temperature raising device when the outside air heated by the heat exchanger for heat radiation is blown as warm air by the heat radiation action of the refrigerant, and the outside air cooled by the heat exchanger for cooling by the heat absorption action of the refrigerant Functions as a temperature reduction device when air is blown as cold air. The heat pump device 35 can also function as a dehumidifier that absorbs moisture from 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 the relative humidity in the house decreases. Therefore, the heat pump device 35 functions as a humidity adjustment 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 measurement values at a plurality of locations in the house main body 3 to control the temperature environment or 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 the periphery of the crop 4. The heater 36 functions as a temperature raising device capable of raising the temperature around the crop 4 by the heating wind. The heater 36 supplies, for example, air warmed by an electric heater, a hot water heater, a combustion heater, or the like into the house. When the heater 36 performs a heating operation, the room temperature rises, so the relative humidity in the house decreases. Therefore, the heater 36 functions as a humidity adjustment device capable of adjusting the relative humidity in the house. The controller 2 controls the heater 36 to keep the room temperature around the crop 4 at the 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 measurement values at a plurality of locations in the house main body 3 to control the temperature environment or humidity environment in the house within the target range.

  The agricultural house 1 includes a dehumidifier 40 capable of dehumidifying air in the house. When the dehumidifier 40 operates, the relative humidity in the house decreases, so the dehumidifier 40 functions as a humidity adjustment device capable of adjusting the relative humidity in the house. The control device 2 controls the operation of the dehumidifier 40 in accordance with control indexes obtained from measurement values at a plurality of locations in the house main body 3 to control the humidity environment in the house within a 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 gas generator 39 so as to keep the carbon dioxide concentration in the house, particularly, around the crop 4 appropriately, in order to promote photosynthesis. For example, the control device 2 operates the carbon dioxide gas generator 39 in a predetermined time zone of one 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 locations in the house main body 3 to make the carbon dioxide concentration environment in the house a target range. Control.

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

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

  The solar radiation sensor 52 detects the amount of solar radiation falling on the house 3. The solar radiation amount information detected by the solar radiation sensor 52 is input to the control device 2 and used to estimate 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 fine daytime.

  The raindrop sensor 53 is a sensor for detecting rain provided outside the house body 3 and capable of detecting the presence or absence of rain. The raindrop sensor 53 is, for example, a sensor that detects rain adhering to the panel as moisture, and detects an electrical resistance between predetermined electrodes. The detected value of the electrical resistance is input to the control device 2, and the control device 2 determines that rain is currently falling if the detected value is less than or equal to a certain resistance value. Also, 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 rain is currently falling if the detected value is greater than or equal to a certain pressure value.

  The temperature sensor 54 detects the temperature of the outside air outside the house 3 and sends it to the control device 2. The humidity sensor 55 detects the humidity of the outside air outside the house 3 and sends it to the control device 2. The plurality of temperature sensors 56 detect the temperature of the air of the crop space in the room of the house main body 3, for example, the temperature around the crop 4, and sends this temperature environment value to the control device 2. The plurality of humidity sensors 57 detect the humidity of the air of the crop space in the room of the house main body 3, for example, the humidity around the crop 4, and sends this humidity environment value to the control device 2. The plurality of carbon dioxide sensors 58 are carbon dioxide concentration detection means for detecting the carbon dioxide concentration of air in the crop space in the room of the house main body 3, for example, the carbon dioxide concentration around the crop 4, and controls 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 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 body 3 and sends the 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, carbon dioxide concentration control devices, water supply control devices, solar radiation amount control devices, and the like. As described above, the temperature control device is controlled by the skylight 30, the side window 31, the curtain 32, the circulation fan 33, the mist generator 34, the heat pump device 35, the heater 36, etc. which can be controlled to adjust the room temperature in the house. It can be configured. The humidity adjustment device can be configured by 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 flow rate adjustment 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 that is controlled to adjust the carbon dioxide concentration in the house. Further, the water supply adjusting device can be configured by a water feeder 37 or the like that is controlled to adjust the water supply to the crop 4. Moreover, the solar radiation amount adjustment apparatus can be comprised by the curtain 32 etc. which can be controlled so that the solar radiation amount which flows in in a house may be adjusted.

  The control device 2 adjusts the water supply pressure of the water supplier 37, opens and closes the curtain 32, adjusts the opening amount of the skylight 30 and the side window 31, the circulation fan 33, the mist generator 34, the carbon dioxide gas generator 39, the heater 36, And control the operation and stop of each of the heat pump devices 35. An electromagnetic relay that switches on and off power supply to each device is used to start and stop energization of each adjustment device. 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 operating 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 to which each of the adjustment devices described above and various sensors are connected, an arithmetic processing unit 21, and a storage unit 22 for storing various data. Prepare. The arithmetic processing unit 21 performs prediction processing or arithmetic processing according to a predetermined program using environment 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 timers for standby processing before and after 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 the above-described 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, to the I / F unit 20, 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. The user can use the operation panel of the control device 2, the operation unit of the personal computer 23, the control panel, the terminal device, etc. to perform environment setting such as room temperature in the house, set the time, etc. The current driving condition can be confirmed through the screen.

[2. processing]
The condensation suppression process performed by the control device 2 will be described with reference to the flowchart of FIG. This condensation suppression processing is performed simultaneously with environmental control in the house that is constantly performed to promote the growth of the crop 4. The control device 2 constantly detects the temperature and humidity of the air in the crop space and the temperature and humidity of the external air, and when it is determined that the direct condensation on the surface of the crop 4 needs to be suppressed, In order to prevent the occurrence of condensation, a predetermined device is controlled to a predetermined operation state. In addition, external air here is the external air on the basis of a crop space, specifically, the air of a non-crop space, and the air of the exterior of a house. The condensation suppression process is always performed if the agricultural house 1 is growing the crop 4. Specifically, the condensation suppression process is repeatedly performed at predetermined time intervals.

In S10, the control device 2 performs initialization etc. of the stored data after activation.
At S11, the control device 2 inputs environmental information from each sensor and the state of various adjustment devices. In the present embodiment, the control device 2 inputs at least the humidity of the external air and the temperature of the air of the crop space as environmental information, and the states of the skylight 30 and the curtain 32 as the states of various adjustment devices. The value detected by the humidity sensor 55 or the humidity sensor 60 is used as the humidity of the external air. The temperature detected by the temperature sensor 56 is used as the temperature of the air in the crop space. For the state of the skylight 30 and the curtain 32, either fully closed or open information is used.

In S12, the control device 2 executes arithmetic processing.
Here, specific contents of the arithmetic processing will be described with reference to the flowchart of FIG. The arithmetic processing determines the outputs 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 100% relative humidity of the temperature of the air of the crop space from the temperature of the air of the crop space.

Subsequently, in S121, the control device 2 executes condensation prediction processing.
Here, the specific contents of the condensation prediction process will be described using the flowchart of FIG. 5.

  In S210, the control device 2 determines whether condensation prediction is required to predict whether condensation will occur directly on the surface of the crop 4. Specifically, when controlling the skylight 30 or the curtain 32 in the open state, as shown in FIG. 6, the control device 2 tries to control the skylight 30 and the curtain 32 in the open state. Based on the control target, it is determined whether condensation prediction is necessary. In addition, when not controlling the skylight 30 or the curtain 32 in the open state, the control device 2 determines that condensation prediction is not necessary. The details are as follows.

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

(1) The state of the skylight 30 and the curtain 32 is fully closed, and the control target is the skylight 30.
On the other hand, when any one of the following conditions (2) to (5) is satisfied, it is determined that condensation prediction is necessary. By controlling the controlled object in the open state, external air can flow into the crop space, and condensation can be generated directly on the surface of the crop 4. As described above, control for causing external air to flow into the crop space is hereinafter referred to as "inflow control".

(2) and (3) Both the state of the skylight 30 and the curtain 32 are 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.
If it is determined in S210 that condensation prediction is not necessary, the control device 2 shifts the processing to S213.

On the other hand, when it is determined in S210 that condensation prediction is necessary, the control device 2 shifts the processing to S211.
In S211, in order to predict whether condensation occurs directly on the surface of the crop 4, the control device 2 determines whether 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 the dew point temperature of the external air-the temperature of the air in the crop space 所 定 a predetermined set value. In addition, whether 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 of the crop space, specifically, "the absolute humidity of the external air-the relative temperature of the air of the crop space It is determined whether or not absolute humidity 所 定 predetermined set value corresponding to 100% humidity. Note that the two predetermined setting values described above are values of 0 or more, and may be different values or the same value.

  Here, "dew point temperature of external air-temperature of air in crop space 所 定 predetermined set value" and "absolute humidity of external air-absolute humidity corresponding to 100% relative humidity of air temperature of crop space" It is predicted that dew condensation will occur directly on the surface of the crop 4 if ≧ predetermined set value ”. When the inflow control is performed in a state where the temperature of the external air is warmer than the temperature of the air in the crop space, the external air that has flowed into the crop space contacts the crop 4 and the crop space before the inflow control is performed. It is cooled to near the temperature of the air. As a result, the temperature of the inflowing external air falls to the dew point temperature or lower, and the relative humidity of the inflowing external air rises to 100%. Therefore, condensation is likely to occur directly on the surface of the crop 4.

  On the other hand, it is not "dew point temperature of external air-temperature of air in crop space 所 定 predetermined set value", or "absolute humidity of external air-absolute humidity 所 定 predetermined corresponding to 100% relative humidity of air temperature of crop space" If it is not "the set value", it is predicted that condensation will not occur directly on the surface of the crop 4. When the inflow control is performed in a state where the temperature of the external air is lower than the temperature of the air in the crop space, the external air that has flowed into the crop space contacts the crop 4 and the crop space before the inflow control is performed. It is warmed to near the temperature of the air. Thereby, the temperature of the inflowing external air does not fall below the dew point temperature, or the relative humidity of the inflowing external air does not rise to 100%. Therefore, the possibility of direct dew condensation on the surface of the crop 4 is low.

  The temperature of the air of the crop space adopted by the control device 2 in S211 is a measurement value that is the lower temperature among the plurality of measurement values. Moreover, the absolute humidity equivalent to 100% of relative humidity of the air of the crop space which the control apparatus 2 employ | adopts by S211 uses the measured value used as the lower absolute humidity among several measured values. Then, as shown in FIG. 6, the dew point temperature and the absolute humidity of the air in the non-crop space or the air outside the house are adopted as the dew point temperature and the absolute humidity of the external air in S211. It is determined by the state of the skylight 30 and the curtain 32, the control target to be controlled to the open state, and the presence or absence of the temperature sensor 59 and the humidity sensor 60 that measure the temperature and humidity of the air in the non-crop space.

  Specifically, since the agricultural house 1 of the present embodiment includes the temperature sensor 59 and the humidity sensor 60 for detecting the dew point temperature and the absolute humidity of air in the non-crop space, the skylight 30 and the curtain 32 When all the states are fully closed and the control target is the curtain 32, the condition of (2) shown in FIG. 6 is satisfied. For this reason, the dew point temperature and the absolute humidity of the air in the non-crop space are adopted as the dew point temperature and the absolute humidity of the external air. 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, as shown in FIG. The condition of (3) shown in 6 is satisfied. For this reason, 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 external air. In addition, when satisfy | filling the conditions of (4) or (5) shown in FIG. 6, the dew point temperature and absolute humidity of the air of the exterior of a house are employ | adopted as dew point temperature and absolute humidity of external 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 external air, and the absolute humidity of the external air corresponds to the relative humidity 100% of the temperature of the air in the crop space If it is determined that the temperature is higher than the humidity, the process proceeds to S212.

In S212, since there is a high concern that condensation will occur directly on the surface of the crop 4, the control device 2 prohibits the inflow control, and then ends the condensation prediction process of FIG.
On the other hand, in the control device 2, at least one of the temperatures of the air in the crop space is not 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 air temperature of the crop space If it is determined not, the process proceeds to S213.

In S213, the control device 2 has low concern that dew condensation will occur directly on the surface of the crop 4, and thus permits inflow control, and then ends the dew condensation prediction process of FIG.
Returning to FIG. 4, in S122, the control device 2 executes the condensation prevention process.

Here, the specific contents of the condensation prevention process will be described using the flowchart of FIG. 7.
In S220, the control device 2 determines whether condensation is predicted to occur in the condensation prediction process.

When it is determined in S220 that condensation is not predicted to occur, the control device 2 proceeds to S223.
On the other hand, when it is determined that condensation is predicted to occur in S220, the control device 2 proceeds to S221.

  In S221, the control device 2 determines whether the temperature of the air in the crop space is equal to or lower than a predetermined temperature. In order to suppress direct condensation on the surface of the crop 4, the temperature of the air in the crop space needs to be higher than the dew point temperature of the external air. Therefore, the predetermined temperature is set to a temperature obtained by adding a user-settable value to the dew point temperature of the external air. The reason why the user can add the settable value is because an error or the like in the calculation of the dew point temperature is taken into consideration. In S221, the control device 2 uses the measured value of the temperature of the air 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 S211 described above.

If it is determined at S221 that the temperature of the air in the crop space is equal to or lower than the predetermined temperature, the control device 2 proceeds to S222.
In S222, the control device 2 needs heating for the purpose of preventing condensation directly on the surface of the crop 4. Therefore, after the start of operation of the heater 36 is requested, the condensation prevention process of FIG. 7 ends.

On the other hand, when it is determined in S221 that the temperature of the air in the crop space is not lower than the predetermined temperature, the control device 2 proceeds to S223.
In S223, since the control device 2 does not require heating for the purpose of preventing condensation directly on the surface of the crop 4, the control unit 2 requests the operation stop of the heater 36, and then ends the condensation prevention process of FIG.

  Returning to FIG. 4, in S123, the control device 2 comprehensively determines and determines various outputs based on the results of the condensation prediction process and the condensation prevention process. For example, when the inflow control is prohibited in S212, the control device 2 controls not to open the skylight 30 or the curtain 32, thereby preventing the absolute humidity of the air in the crop space from being 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 controls the heater 36 to actually raise the temperature of the air of the crop space according to the request for starting the operation of the heater 36 in S222, whereby the heater 36 can control the external air Raise the temperature of the crop space air to be higher than the dew point temperature. In addition, even when the operation stop of the heater in S223 is requested, the control device 2 performs control to increase the temperature of the air in the crop space when it is desired to increase the temperature of the air in the crop space. It is also good.

After determining various outputs in S123, the control device 2 ends the arithmetic processing of FIG.
Returning to FIG. 3, in S13, the control device 2 returns the processing to S11 after the user can check the judgment result of condensation prediction, the state of various adjustment devices, standby information by timer, etc., and performs condensation suppression control. repeat.

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

  According to such a configuration, when it is predicted that dew condensation will occur directly on the surface of the crop 4, inflow control is prohibited. 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. Thereby, while suppressing direct condensation on the surface of the crop 4, the environment for promoting the cultivation of the crop 4 can be maintained for a long time.

  (3b) In the present embodiment, the agricultural house 1 includes the humidity sensor 60 for detecting the humidity of the air in the non-crop space. Thereby, if 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 when the condition of (2) described above is satisfied, specifically, the crop space It is possible to predict whether condensation will occur directly on the surface of the crop 4 on the basis of accurate humidity measurements of the air flowing into it. Therefore, the timing at which the curtain 32 is opened can be optimized in environmental control for promoting breeding.

  (3c) In this embodiment, although the house 1 for agriculture was provided with the humidity sensor 60 for detecting the humidity of the air of non-crop space, even if it was the structure which is not provided with the humidity sensor 60, it mentioned above ( If the condition of 3) is satisfied, it can be predicted whether 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 of the non-crop space. According to such a configuration, compared with the configuration including the humidity sensor 60, the agricultural house 1 can be configured at low cost.

  (3d) In the present embodiment, if it is predicted that dew condensation will occur directly on the surface of the crop 4 and if it is determined that the temperature of the air in the crop space is below the predetermined temperature, the temperature in the house is raised. It is required to start the operation of the heater. Thus, the temperature of air in the crop space can be adjusted so that condensation does not occur directly on the surface of the crop 4 by executing the inflow control.

(3e) In the present embodiment, the user can check whether condensation has been predicted or not. Therefore, the user can adjust various adjustment devices in consideration of the influence on the crop 4.
In the present embodiment, S123 corresponds to processing as a control unit, S211 corresponds to processing as a prediction unit, S221 corresponds to processing as a temperature determination unit, and S122 corresponds to processing as a request unit. Do.

[4. Other embodiments]
As mentioned above, although embodiment of this indication was described, it can not be overemphasized that this indication can take various forms, without being limited to the above-mentioned embodiment.

  (4a) In the above embodiment, when the state of the skylight 30 and the curtain 32 is fully closed and the control target is the skylight 30, the configuration in which condensation is not predicted is exemplified, for example, air outside the house Condensation prediction may be performed 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 suppress the opening of the skylight 30 despite the concern of 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 state of the skylight 30 and the curtain 32 is fully closed. When the object is the curtain 32, the dew point temperature and the absolute humidity of the air in the non-crop space are adopted as the dew point temperature and the absolute humidity of the external air, for example, the dew point temperature and the absolute humidity of the air outside the house It is good also as composition.

  (4c) In the above embodiment, either the fully closed or open information 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. The configuration may be such that it can be set to the fully closed state.

  (4d) In the above-mentioned embodiment, although temperature sensor 56 and humidity sensor 57 are installed in two predetermined places in a house, an installation place is not limited to this. For example, the installation position of the temperature sensor 56 and the humidity sensor 57 may be one, or three or more.

  (4e) The user may be able to set the reference of necessity of condensation prediction in condensation prediction processing. For example, compared with the crop 4 such as tomato having a high heat capacity, the crop 4 having a low heat capacity can also follow a rapid temperature change due to the execution of the inflow control. For this reason, the possibility that dew condensation will occur directly on the surface of the crop 4 is low. Therefore, for example, when cultivating crop 4 having a low heat capacity, condensation suppression control is necessary by setting the user not to need condensation prediction for at least a part of the conditions for which condensation prediction is required in the above embodiment. It can be set as the structure which is hard to be performed above.

  (4f) The function of one component in the above embodiment may be distributed as a plurality of components, or the function of a plurality of components may be integrated into one component. In addition, part of the configuration of the above embodiment may be omitted. In addition, at least a part of the configuration of the above-described embodiment may be added to or replaced with the configuration of the other above-described embodiment. In addition, all the aspects contained in the technical thought specified from the wording as described in a claim are an embodiment of this indication.

  (4g) In addition to the control device described above, the present disclosure includes various systems including the control device as a component, a program for causing a computer to function as the control device, a medium storing the program, a condensation suppression control method, and the like. Can be realized in the form of

  DESCRIPTION OF SYMBOLS 1 ... House for agriculture, 2 ... Control device, 3 ... House main body, 4 ... Crop, 20 ... I / F part, 21 ... Arithmetic processing part, 22 ... Storage part, 23 ... Personal computer, 30 ... Skylight, 31 ... side Window 32 32 curtain 33 circulating fan 34 mist generator 35 heat pump device 36 heater 37 water supply 38 bed 39 carbon dioxide gas generator 40 dehumidifier 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)

A control device (2) for controlling the indoor environment inside the house in an agricultural house (1) for growing a crop (4),
A control unit (S123) capable of executing inflow control for causing external air, which is air outside the crop space, to flow into a crop space where the crop is present inside the house;
A prediction unit (S211) for predicting whether condensation occurs on the crop by the inflow control;
Equipped with
The prediction unit determines that the temperature of 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 corresponds to 100% relative humidity of the temperature of the air in the crop space If it is determined that the humidity is above absolute humidity, it is predicted that condensation will occur on the crop,
The control device prohibits the inflow control when it is predicted by the prediction unit that condensation will occur. The control device according to claim 1, wherein
The control unit is a curtain (32) capable of dividing the interior of the house into the crop space and the non-crop space where the crop does not exist, and a window capable of communicating the non-crop space with the outside of the house 30), the control for changing at least one of the closed state to the open state can be executed as the inflow control,
The control unit predicts whether condensation occurs on the crop, using the air in the non-crop space or the air outside the house as the external air. The control device according to claim 1 or 2, wherein
When the control unit changes the curtain from the closed state to the open state while the closed state of the window is maintained by the controller as the inflow control, the prediction unit uses the air in the non-crop space as the external air. The controller, which predicts whether condensation will occur on the crop, based on the measured value of the humidity of air in the non-crop space. The control device according to claim 1 or 2, wherein
When the control unit changes the curtain from the closed state to the open state while the closed state of the window is maintained as the inflow control, the prediction unit uses the air outside the house as the external air. The controller, which predicts whether dew condensation occurs 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, wherein
A temperature determination unit (S221) that determines whether the temperature of the air in the crop space is less than or equal to a predetermined temperature;
When it is predicted by the prediction unit that condensation will occur on the crop, and when the temperature judgment unit judges that the temperature is below the predetermined temperature, start of operation of a heater capable of supplying warm air to the inside of the house A request unit (S122) for requesting the control unit;
The controller further comprising: An agricultural house (1) that controls the indoor environment inside the house to grow crops (4),
A curtain (32) which can be opened and closed between a closed state for shielding external light incident from the outside of the house and an open state for irradiating the crop without shielding the external light;
Windows (30) that control the amount of air flow to and from the house;
A control device (2) according to any one of claims 1 to 5;
, An agricultural house.