JP2004201630A - Method for controlling environment in greenhouse and apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the variation of the temperature in a green house caused by the change in outer environment condition such as outdoor temperature and solar radiation and control and adjust the blooming time of plants such as Phalaenopsis aphrodite. <P>SOLUTION: The difference Δtout between the preset heating temperature tHsp and the outdoor temperature tout is calculated and multiplied with an additional heating coefficient KH1 to obtain the addition amount Hα. The addition amount Hα is added to the preset heating temperature tHsp to obtain the corrected preset heating temperature tHsp'. Similarly, the difference Δtout between the preset cooling temperature tCsp and the outdoor temperature tout is calculated and multiplied with an additional cooling coefficient KC1 to obtain the addition amount Cα. The addition amount Cα is added to the preset cooling temperature tCsp to obtain the corrected preset cooling temperature tCsp'. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for controlling the environment in a greenhouse suitable for cultivating plants such as Phalaenopsis orchid.
[0002]
[Prior art]
For cultivation of ornamental plants such as phalaenopsis, a greenhouse equipped with a cooling and heating device is used for the purpose of shipping at a time when the selling price is high. FIG. 11 is a schematic configuration diagram illustrating an example of a greenhouse used for growing Phalaenopsis orchid.
[0003]
In FIG. 11, reference numeral 1 denotes a greenhouse, which is entirely covered with transparent vinyl or the like. A roof 1A of the greenhouse 1 is provided with a skylight 2 and a roof 3 is provided on the roof 2 so as to be freely opened and closed in the vertical direction. Reference numeral 4 denotes a motor for opening and closing the roof 3. A curtain 5 (5-1, 5-2) is installed under the roof 1A in the greenhouse 1. Reference numerals 6-1 and 6-2 denote motors for extending / retracting the curtains 5-1 and 5-2. The figure shows a state where the curtain 5 is extended. Note that the curtain 5 is silver (silver).
[0004]
A ventilation fan 9 is provided in an upper part in the greenhouse 1. A temperature sensor 10 and a humidity sensor 11 are provided at a central portion in the greenhouse 1. The temperature measured by the temperature sensor 10 is given to the control device 8 as the inside air temperature tin. The humidity measured by the humidity sensor 11 is given to the control device 8 as the inside air humidity RHin. Hereinafter, the temperature sensor 10 is called an inside air temperature sensor, and the humidity sensor 11 is called an inside air humidity sensor.
[0005]
A cooling / heating device 12 is provided in the greenhouse 1, and performs cooling or heating in the greenhouse 1 in accordance with an instruction from the control device 8. The controller 8 is supplied with a heating set temperature tHsp, a cooling set temperature tCsp, a skylight target temperature tRsp, and the like from a personal computer (hereinafter, referred to as a personal computer) 13.
[0006]
[Heating control: winter season]
The control device 8 compares the inside air temperature tin from the inside air temperature sensor 10 with the heating set temperature tHsp, and when the inside air temperature tin falls below the heating set temperature tHsp, issues a heating instruction to the cooling / heating device 12 and the greenhouse 1 Heat inside. By this heating, the temperature in the greenhouse 1 rises, and when the inside air temperature tin becomes tin ≧ tHsp + tα (tα: hysteresis), the control device 8 stops heating. Thereby, the inside air temperature tin in the greenhouse 1 is maintained at the heating setting temperature tHsp. In addition, the control device 8 expands the curtain 5 as necessary to maintain the temperature inside the greenhouse 1.
[0007]
[Cooling control: Summer]
The control device 8 compares the inside air temperature tin from the inside air temperature sensor 10 with the cooling set temperature tCsp, and when the inside air temperature tin exceeds the cooling set temperature tCsp, issues a cooling instruction to the cooling / heating device 12 and the greenhouse 1. Cool the inside. Due to this cooling, the temperature in the greenhouse 1 decreases, and when the inside air temperature tin becomes tin ≦ tCsp−tβ (tβ: hysteresis), the control device 8 stops the cooling. Thereby, the inside air temperature tin in the greenhouse 1 is maintained at the cooling set temperature tCsp. In addition, the control device 8 expands the curtain 5 as necessary to keep the inside of the greenhouse 1 cool.
[0008]
(Interim period)
During winter and summer, and in the middle of summer and winter, cooling may be performed during the day and heating may be performed at night. That is, in the daytime, the cooling is performed when the inside air temperature tin exceeds the cooling set temperature tCsp, and in the nighttime, the heating is performed when the inside air temperature tin falls below the heating set temperature tHsp. In this case, the inside air temperature tin is maintained at the cooling setting temperature tCsp during the daytime, and the inside air temperature tin is maintained at the heating setting temperature tHsp during the nighttime.
[0009]
(Skylight control)
When the curtain 5 is extended in the summer, hot air is trapped between the roof 1A and the curtain 5. Thereby, the space temperature between the roof 1A and the curtain 5 becomes higher than the outside air temperature, and the cooling effect is reduced. When the inside air temperature tin is higher than the cooling set temperature tCsp, the controller 8 sets the opening amount of the roof 3 with respect to the skylight 2 (hereinafter, the skylight 2) in accordance with the difference between tin and tCsp so as not to fall into such a situation. Control). That is, when the outside-curtain temperature tR becomes high, the skylight 2 is opened by an amount corresponding to the difference from the outside-curtain temperature tR, and the hot air between the roof 1A and the curtain 5 is discharged to the outside.
[0010]
Note that the above-described conventional technology is a technology currently employed by the present applicant, and is not publicly known as far as the applicant knows at the time of filing. In addition, the applicant has not been able to find prior art documents related to the present invention by the time of filing. Therefore, prior art document information is not disclosed.
[0011]
[Problems to be solved by the invention]
According to the above-described conventional technology, the inside air temperature tin in the greenhouse 1 is maintained at the heating setting temperature tHsp in winter, and is maintained at the cooling setting temperature tCsp in summer, and the average thereof over the year is obtained. The temperature will be maintained at approximately the median of the heating set temperature tHsp and the cooling set temperature tCsp.
[0012]
Here, for example, when the cooling set temperature tCsp is set to 30 ° C. and the heating set temperature tHsp is set to 25 ° C., and phalaenopsis is grown in the greenhouse 1 from a seedling state, flower buds are formed in 12 to 15 months. Thereafter, when the cooling set temperature tCsp is raised to 25 ° C. and the heating set temperature tHsp is raised to 18 ° C., the product can be shipped in 4 to 5 months. As described above, when phalaenopsis is grown in the greenhouse 1 provided with the cooling / heating device 2, the flowering time can be adjusted, and the flower can be shipped at a time when the selling price is high.
[0013]
However, the inside air temperature tin in the greenhouse 1 fluctuates due to the outside air temperature, the amount of solar radiation, and the like, and the set temperature cannot often be maintained. In this case, the “set temperature” refers to a heating set temperature tHsp for heating control and a cooling set temperature tCsp for cooling control. A case where the inside air temperature tin is within a predetermined temperature range defined for the heating set temperature tHsp and the cooling set temperature tCsp is defined as a state where the inside air temperature tin maintains the set temperature.
[0014]
For example, in winter, when the outside air temperature is low, the temperature rise of the inside air temperature tin when the heating is turned on becomes slow, and the temperature drop of the inside air temperature tin when the heating is turned off becomes fast. Conversely, when the outside air temperature is high, the temperature rise of the inside air temperature tin when the heating is turned on becomes faster, and the temperature drop of the inside air temperature tin when the heating is turned off becomes slower (the heating is turned off). At this time, the inside air temperature tin may further rise due to the residual heat.) Therefore, when the outside air temperature is low, the inside air temperature tin changes to a low value, and when the outside air temperature is high, the inside air temperature tin changes to a high value, and the heating set temperature tHsp may not be maintained.
[0015]
Similarly, for example, in summer, when the outside air temperature is high, the temperature drop of the inside air temperature tin when the cooling is turned on becomes slow, and the temperature rise of the inside air temperature tin when the cooling is turned off becomes fast. Conversely, when the outside air temperature is low, the temperature drop of the inside air temperature tin when the cooling is turned on becomes faster, and the temperature rise of the inside air temperature tin when the cooling is turned off becomes slower (the cooling is turned off). At this time, the inside air temperature tin may further decrease due to the residual heat.) Therefore, when the outside air temperature is low, the inside air temperature tin changes to a low value, and when the outside air temperature is high, the inside air temperature tin changes to a high value, and the cooling set temperature tCsp may not be maintained.
[0016]
It can be said that the amount of solar radiation is the same as the outside air temperature. In winter, when the amount of solar radiation is small, the inside air temperature tin changes to a low value, and when the amount of solar radiation is large, the inside air temperature tin changes to a high value, and the heating set temperature tHsp May not be maintained. Further, in the summer, when the amount of solar radiation is small, the inside air temperature tin changes to a low value, and when the amount of solar radiation is large, the inside air temperature tin changes to a high value, so that the cooling set temperature tCsp may not be maintained.
[0017]
The amount of hot air discharged from between the roof 1A and the curtain 5 depends on the difference between the air temperature and the outside air temperature between the roof 1A and the curtain 5, that is, the difference between the inside and outside air temperatures. When the inside / outside temperature difference is small, the amount of hot air emission per unit area is small, and when the inside / outside temperature difference is large, the amount of hot air emission per unit area is large. In the related art, the opening amount of the skylight 2 is controlled in accordance with the difference between the inside air temperature tin and the cooling set temperature tCsp during the cooling use period, but the opening amount of the skylight 2 is controlled regardless of the outside air temperature and the amount of solar radiation. Since the proportional sensitivity at the time of opening is uniform, especially when the skylight 2 is opened, the proportional sensitivity at the time of opening is uniform, so that when the outside air temperature is high or the amount of solar radiation is large, the amount of discharged hot air is small. The inside air temperature tin is one of the factors that make it impossible to maintain the cooling set temperature tCsp.
[0018]
As described above, in the prior art, the inside air temperature tin in the greenhouse 1 fluctuates due to the external environment such as the outside air temperature and the amount of solar radiation, and the set temperature cannot be often maintained. Therefore, it is difficult to adjust the flowering time of Phalaenopsis orchid. In other words, there is a possibility that a problem that shipment cannot be performed at a time when the selling price is high may occur.
[0019]
The present invention has been made in order to solve such a problem, and an object of the present invention is to suppress fluctuations in the inside air temperature due to the external environment such as the outside air temperature and the amount of solar radiation, and to control the flowering time of plants such as phalaenopsis. It is an object of the present invention to provide a method and apparatus for controlling an environment in a greenhouse that can be adjusted.
[0020]
[Means for Solving the Problems]
In order to achieve such an object, the present invention determines a heating set temperature and a cooling set temperature, performs heating when the inside air temperature in the greenhouse is lower than the heating set temperature, and sets the inside air temperature in the greenhouse to the cooling set temperature. In a method for controlling the environment in a greenhouse in which cooling is performed when the temperature exceeds the set temperature, the heating set temperature and the cooling set temperature are corrected according to the external environment.
According to the present invention, the heating set temperature is corrected according to the external environment such as the external temperature and the amount of solar radiation, and the heating control in the greenhouse is performed according to the corrected heating set temperature. Further, the cooling setting temperature is corrected according to the external environment such as the external temperature and the amount of solar radiation, and the cooling control in the greenhouse is performed according to the corrected cooling setting temperature.
[0021]
For example, a difference between the heating set temperature and the outside air temperature is obtained as an outside air temperature difference, the outside air temperature difference is multiplied by a predetermined cooling addition coefficient to obtain an added amount, and the added amount is added to the cooling set temperature. To obtain the corrected cooling set temperature. In this way, when the outside air temperature decreases in winter, the heating set temperature is set to a higher temperature, and a change in the inside air temperature, which tends to change to a lower temperature, is suppressed. Conversely, when the outside air temperature increases in winter, the heating set temperature is set to a low temperature, and a change in the inside air temperature that tends to change to a high heating temperature is suppressed.
Further, for example, the difference between the cooling set temperature and the outside air temperature is obtained, the difference is obtained as the outside air temperature difference, the outside air temperature is multiplied by a predetermined cooling additional coefficient to obtain an added amount, and the added amount is calculated as the cooling set temperature. To obtain a corrected cooling set temperature. In this manner, when the outside air temperature increases in the summer, the cooling set temperature is set to a low temperature, and a change in the inside air temperature that tends to change to a high temperature is suppressed. Conversely, when the outside air temperature becomes low in the summer, the cooling set temperature is set high, and the change in the inside air temperature that tends to change to a low temperature is suppressed.
[0022]
Further, the present invention provides a temperature between a roof of a greenhouse and a curtain extended under the roof as a temperature outside the curtain, and a roof of the greenhouse according to a difference between the temperature outside the curtain and a predetermined target temperature. In the environmental control method for controlling the amount of opening of a skylight provided in a greenhouse, the control amount when the skylight is opened is corrected according to an external environment.
According to the present invention, the skylight is opened according to the difference between the outside curtain temperature and the predetermined target temperature, but the control amount when opening the skylight is corrected by the external environment such as the external temperature and the amount of solar radiation. . For example, the difference between the target temperature and the outside air temperature is obtained, and the proportional sensitivity when opening the skylight (opening proportional sensitivity) is corrected according to the difference. Furthermore, in the summer, when the outside air temperature increases (when the difference between the target temperature and the outside air temperature increases), the open-time proportional sensitivity is increased. Thus, in summer, when the difference between the target temperature and the outside air temperature increases, the opening amount of the skylight increases, and the amount of hot air discharged to the outside increases.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing one example of an environment control device used for implementing a method for controlling the environment in a greenhouse according to the present invention. 11, the same reference numerals as those in FIG. 11 denote the same or equivalent components as those described with reference to FIG. 11, and a description thereof will be omitted.
[0024]
In this embodiment, outside the greenhouse 1, outside air temperature sensor 14, which measures outside air temperature, outside air humidity sensor 15, which measures outside humidity, solar radiation sensor 16 which measures solar radiation, and wind direction sensor which measures wind direction 17, a wind speed sensor 18 for measuring the wind speed, and a rain sensor 19 for sensing rainfall, and the measured values of these sensors are provided to the control device 8.
[0025]
Also, under the roof 1A in the greenhouse 1, the first curtain 20 (20-1, 20-2), the second curtain 21 (21-1, 21-2), and the third curtain 22 ( 22-1 and 22-2). The fourth curtain 23 (23-1, 23-2) is installed on the roof 1A. Reference numerals 24-1 and 24-2 denote motors for extending / retracting the first curtains 20-1 and 20-2. 25-1 and 25-2 are motors for extending / retracting the second curtains 21-1 and 21-2. 26-1 and 26-2 are motors for extending / retracting the third curtains 22-1 and 22-2. 27-1 and 27-2 are motors for extending / retracting the fourth curtains 23-1 and 23-2.
[0026]
The first curtain 20 is provided below the second curtain 21 and is used for keeping heat / cooling. The second curtain 21 is provided below the third curtain 22, and is used for keeping heat / cooling similarly to the first curtain 20. The third curtain 22 is provided under the roof 1A and is used for shielding light. The fourth curtain 23 is provided on the roof 1 </ b> A, and is used for shielding light, like the third curtain 22. In FIG. 1, the first to fourth curtains 20 to 24 show a state in which they are all extended.
[0027]
Note that the first curtain 20 is transparent, the second curtain 21 is silver (silver), and the third curtain 22 and the fourth curtain 23 are black. The outside-curtain temperature sensor 7 is provided between the roof 1A and the third curtain 22-1 that extends under the roof 1A. Further, a temperature sensor 7 is provided between the roof 1A and the curtain 22-1 that extends under the roof 1A. The temperature measured by the temperature sensor 7 is given to the control device 8 as the outside-curtain temperature tR. Hereinafter, the temperature sensor 7 is referred to as an outside-curtain temperature sensor.
[0028]
FIG. 2 is a block diagram illustrating a schematic configuration of the control device 8. In the figure, 8-1 is a CPU, 8-2 is a RAM, 8-3 is a ROM, and 8-4 and 8-5 are interfaces. The CPU 8-1 obtains various input information provided through the interface 8-4, and operates according to the program stored in the ROM 8-3 while accessing the RAM 8-2.
[0029]
The ROM 8-3 stores a program for controlling the temperature (temperature control program). This temperature control program may be provided in a form stored in the ROM 8-3 at the factory shipment stage, or may be provided in a form downloaded from the personal computer 13. Alternatively, the program may be provided in a state recorded on a recording medium such as a CD-ROM, read from the recording medium, and installed in the ROM 8-3. Hereinafter, the processing operation of the CPU 8-1 according to the temperature control program will be described.
[0030]
[Heating control: winter season]
The CPU 8-1 compares the inside air temperature tin from the inside air temperature sensor 10 with the heating set temperature tHsp, and when the inside air temperature tin falls below the heating set temperature tHsp, issues a heating instruction to the cooling / heating device 12 and the greenhouse 1. Heat inside. By this heating, the temperature in the greenhouse 1 rises, and when the inside air temperature tin becomes tin ≧ tHsp + tα, the CPU 8-1 stops heating. Thereby, the inside air temperature tin in the greenhouse 1 is maintained at the heating setting temperature tHsp.
[0031]
[Outdoor temperature correction of heating set temperature]
In winter, when the outside air temperature is low, the temperature rise of the inside air temperature tin when the heating is turned on becomes slow, and the temperature drop of the inside air temperature tin when the heating is turned off becomes fast. Conversely, when the outside air temperature is high, the temperature rise of the inside air temperature tin when the heating is turned on becomes faster, and the temperature drop of the inside air temperature tin when the heating is turned off becomes slower (the heating is turned off). At this time, the inside air temperature tin may further rise due to the residual heat.) Therefore, when the outside air temperature is low, the inside air temperature tin changes to a low value, and when the outside air temperature is high, the inside air temperature tin changes to a high value, and the heating set temperature tHsp may not be maintained.
[0032]
In order to prevent such a state from occurring, in the present embodiment, the fluctuation of the inside air temperature tin due to the outside air temperature is suppressed as described below, and the heating set temperature tHsp can be maintained. That is, the outside air temperature correction of the inside air temperature tin is performed so as to fall within a predetermined temperature range defined with respect to the heating set temperature tHsp. FIG. 3 is a flowchart showing an outside air temperature correction process of the heating set temperature tHsp performed by the CPU 8-1 periodically (every 15 minutes in this example).
[0033]
The CPU 8-1 determines the 15-minute average outside air temperature tout based on the outside air temperature tout from the outside air temperature sensor 15 taken in a predetermined cycle. _Fifteen Is obtained (step 301). Then, the obtained 15-minute average outside air temperature tout _Fifteen Is subtracted from the heating set temperature tHsp (step 302), and an outside air temperature difference Δtout from the heating set temperature tHsp is obtained. In winter, the outside air temperature tout is lower than the heating set temperature tHsp, and therefore Δtout is determined as a positive value.
[0034]
Then, the CPU 8-1 multiplies the determined outside air temperature difference Δtout by a predetermined heating additional coefficient KH1 to determine an additional amount Hα (° C.) (step 303). Then, the obtained additional amount Hα is added to the heating set temperature tHsp to obtain a corrected heating set temperature tHsp ′. Thereafter, the corrected heating set temperature tHsp 'is used in place of the heating set temperature tHsp until the next 15 minutes have elapsed. The heating additional coefficient KH1 used in step 303 is an additional temperature per 1 ° C. of the outside air temperature difference Δtout, and can be set to a value of 0 to 0.1.
[0035]
By performing such outside air temperature correction, when the outside air temperature tout decreases in winter, that is, when the absolute value of the outside air temperature difference Δtout increases, the heating set temperature tHsp is set to be higher. In addition, a change in the inside air temperature tin that tends to shift to a lower level is suppressed. Conversely, in the winter, when the outside air temperature tout increases, that is, when the absolute value of the outside air temperature difference Δtout decreases, the heating set temperature tHsp is set to a low value and tends to change to a high value. The change in the inside air temperature tin is suppressed. Thereby, even if the outside air temperature tout fluctuates, the inside air temperature tin can be maintained at the desired heating set temperature tHsp.
[0036]
(Outside air temperature correction of cooling set temperature)
In summer, when the outside air temperature is high, the temperature drop of the inside air temperature tin when the cooling is turned on becomes slow, and the temperature rise of the inside air temperature tin when the cooling is turned off becomes fast. Conversely, when the outside air temperature is low, the temperature drop of the inside air temperature tin when the cooling is turned on becomes faster, and the temperature rise of the inside air temperature tin when the cooling is turned off becomes slower (the cooling is turned off). At this time, the inside air temperature tin may further decrease due to the residual heat.) Therefore, when the outside air temperature is low, the inside air temperature tin changes to a low value, and when the outside air temperature is high, the inside air temperature tin changes to a high value, and the cooling set temperature tCsp may not be maintained.
[0037]
In order to prevent such a state from occurring, in the present embodiment, the fluctuation of the inside air temperature tin due to the outside air temperature is suppressed as follows, and the cooling set temperature tCsp can be maintained. That is, the outside air temperature correction of the inside air temperature tin is performed so as to fall within a predetermined temperature range defined with respect to the cooling set temperature tCsp. FIG. 4 is a flowchart showing the outside air temperature correction process of the cooling set temperature tCsp performed by the CPU 8-1 periodically (every 15 minutes in this example).
[0038]
The CPU 8-1 determines the 15-minute average outside air temperature tout based on the outside air temperature tout from the outside air temperature sensor 15 taken in a predetermined cycle. _Fifteen Is obtained (step 401). Then, the obtained 15-minute average outside air temperature tout _Fifteen Is subtracted from the cooling set temperature tCsp (step 402), and an outside air temperature difference Δtout from the cooling set temperature tCsp is obtained. In summer, the outside air temperature tout is higher than the cooling set temperature tCsp, and thus Δtout is determined as a negative value.
[0039]
Then, the CPU 8-1 multiplies the obtained outside air temperature difference Δtout by a predetermined additional coefficient KC1 for cooling to obtain an additional amount Cα (° C.) (step 403). Then, the obtained additional amount Cα is added to the cooling set temperature tCsp to obtain a corrected cooling set temperature tCsp ′. Thereafter, until the next 15 minutes have elapsed, the corrected cooling set temperature tCsp 'is used instead of the cooling set temperature tCsp. The additional coefficient KC1 for cooling used in step 403 is an additional temperature per 1 ° C. of the outside air temperature difference Δtout, and a value of 0 to 0.1 can be set.
[0040]
By performing such outside air temperature correction, when the outside air temperature tout increases in the summer, that is, when the absolute value of the outside air temperature difference Δtout increases, the cooling set temperature tCsp is set to a low value. In addition, a change in the inside air temperature tin that tends to change to a higher value is suppressed. Conversely, in the summer, when the outside air temperature tout decreases, that is, when the absolute value of the outside air temperature difference Δtout decreases, the cooling set temperature tCsp is set to a high value and tends to change to a low value. The change in the inside air temperature tin is suppressed. Thus, even if the outside air temperature tout fluctuates, the inside air temperature tin can be maintained at the desired cooling set temperature tCsp.
[0041]
(Insolation correction of heating set temperature and cooling set temperature)
The same can be said of the amount of solar radiation as well as the outside air temperature. In winter, when the amount of solar radiation is small, the inside air temperature tin changes to a low value, and when the amount of solar radiation is large, the inside air temperature tin changes to a high value, and the heating set temperature tHsp May not be maintained. In the summer, when the amount of solar radiation is small, the inside air temperature tin changes to a low value, and when the amount of solar radiation is large, the inside air temperature tin changes to a high value, so that the cooling set temperature tCsp may not be maintained. By correcting the heating set temperature tHsp and the cooling set temperature tCsp with the amount of solar radiation, the fluctuation of the inside air temperature tin can be suppressed.
[0042]
When the heating set temperature tHsp and the cooling set temperature tCsp are corrected by the amount of solar radiation, for example, a reference amount of solar radiation is determined, and the difference between the reference amount of solar radiation and the 15-minute average amount of solar radiation is determined as the amount of solar radiation. The difference in the amount of solar radiation is multiplied by an additional coefficient to obtain an additional amount with respect to the heating set temperature tHsp or the cooling set temperature set temperature tCsp.
[0043]
[Correction of heating set temperature and cooling set temperature in the interim period]
During winter and summer, and in the middle of summer and winter, cooling may be performed during the day and heating may be performed at night. That is, in the daytime, the cooling is performed when the inside air temperature tin exceeds the cooling set temperature tCsp, and in the nighttime, the heating is performed when the inside air temperature tin falls below the heating set temperature tHsp. In this case, the inside air temperature tin is maintained at the cooling setting temperature tCsp during the daytime, and the inside air temperature tin is maintained at the heating setting temperature tHsp during the nighttime.
[0044]
Here, in the middle period close to summer, the inside air temperature tin is generally higher. In this case, the frequency at which the inside air temperature tin falls below the heating set temperature tHsp is low. Even if the inside air temperature tin falls below the heating set temperature tHsp, heating is not performed. In many cases, the temperature falls between the set temperature tHsp. Also, in the middle near the winter, the inside air temperature tin generally shifts to a lower value. In this case, the frequency of the inside air temperature tin exceeding the cooling set temperature tCsp is low, and even if the inside air temperature tin exceeds the cooling set temperature tCsp, cooling is not performed, and the average daily temperature is equal to the cooling set temperature tCsp and the heating. In many cases, the temperature falls between the set temperature tHsp.
[0045]
Therefore, in the present embodiment, by correcting the heating set temperature and the cooling set temperature in the interim period as described below, by maintaining a suitable temperature, by maintaining a constant room temperature, Adjustment and energy saving at the time of flowering are attempted. FIG. 5 is a flowchart showing a correction process of the heating set temperature and the cooling set temperature in the intermediate period performed by the CPU 8-1.
[0046]
During the cooling operation (summer), the room temperature is maintained by the cooling, so the cooling set temperature is set to a suitable target room temperature. The heating set temperature is set at a temperature lower by 2 ° C. in order to avoid simultaneous operation.
During the cooling operation in the intermediate period, the CPU 8-1 determines the 15-minute average outside air temperature tout based on the outside air temperature tout from the outside air temperature sensor 15 taken in a predetermined cycle. _Fifteen (Step 501 shown in FIG. 5A). Then, the obtained 15-minute average outside air temperature tout _Fifteen Is compared with the cooling set temperature tCsp (step 502). _Fifteen If ≦ tCsp, the heating set temperature tHsp is raised by 1 ° C. and the cooling set temperature tCsp is raised by 2 ° C. (step 503). Thus, when the outside air temperature is low during the cooling operation in the intermediate period, the heating set temperature tHsp is raised and returned to the set temperature during the heating operation, so that a suitable temperature condition is obtained. Further, the cooling set temperature tCsp is increased, and the cooling frequency due to the remaining heat of heating is eliminated, thereby saving energy.
[0047]
During the heating operation (winter), the room temperature is maintained by heating, so the heating set temperature is set to a suitable target room temperature. The cooling set temperature is set at 2 ° C. higher to avoid simultaneous operation.
During the heating operation in the intermediate period, the CPU 8-1 determines the 15-minute average outside air temperature tout based on the outside air temperature tout from the outside air temperature sensor 15 taken in at a predetermined cycle. _Fifteen (Step 504 shown in FIG. 5B). Then, the obtained 15-minute average outside air temperature tout _Fifteen Is compared with the heating set temperature tHsp (step 505). _Fifteen If ≧ tHsp, the cooling set temperature tCsp is lowered by 1 ° C. and the heating set temperature tHsp is lowered by 2 ° C. (step 506). Thereby, when the outside air temperature is high during the heating operation in the intermediate period, the cooling set temperature tCsp is lowered and returned to the set temperature during the cooling operation, whereby a suitable temperature condition is obtained. Further, the heating set temperature tHsp is lowered, and the heating frequency due to the remaining heat of cooling is eliminated, thereby saving energy.
[0048]
In FIG. 5, during the cooling operation in the intermediate period, the 15-minute average outside air temperature tout _Fifteen And the cooling set temperature tCsp, and during the heating operation in the intermediate period, the 15-minute average outside air temperature tout _Fifteen Although the heating and the set temperature tHsp are compared, the temperature may be compared with, for example, an intermediate temperature between the cooling set temperature tCsp and the set heating temperature tHsp without separating the cooling operation and the heating operation.
[0049]
(Skylight control)
The CPU 8-1 determines whether the current time is the cooling use time (April to September) or the heating use time (October to March) based on the timekeeping function, the outside air temperature, and the magnitude of the amount of solar radiation. If the current time is the cooling use time, the CPU 8-1 sets the outside-curtain temperature tR from the outside-curtain temperature sensor 7 as a control input temperature, and according to the temperature difference between the control input temperature and the skylight set temperature tRsp, the skylight 2 is turned on. Control the opening amount. When the current time is the heating use time, the CPU 8-1 sets the inside air temperature tin from the inside air temperature sensor 10 as the control input temperature, and sets the opening amount of the skylight 2 according to the temperature difference between this control input temperature and the skylight set temperature tRsp. Control. Specifically, the opening amount of the skylight 2 is determined by multiplying the difference between the skylight setting temperature tRsp and the inside air temperature tin by a predetermined proportional sensitivity.
[0050]
(Skylight control during cooling use)
In the summer, for example, when the curtain 22 is extended, hot air is trapped between the roof 1A and the curtain 22. Thereby, the space temperature between the roof 1A and the curtain 22 becomes higher than the outside air temperature, and the cooling effect is reduced. The control device 8 controls the opening amount of the skylight 2 according to the difference between the outside curtain temperature tR and the skylight target temperature tRsp during the cooling use period so as not to fall into such a situation.
[0051]
In this case, the amount of hot air discharged from between the roof 1A and the curtain 22 differs depending on the difference between the air temperature and the outside air temperature between the roof 1A and the curtain 22, that is, the inside and outside air temperature difference. When the inside / outside temperature difference is small, the amount of hot air emission per unit area is small, and when the inside / outside temperature difference is large, the amount of hot air emission per unit area is large. In the related art, the proportional sensitivity when controlling the opening amount of the skylight 2 is uniform regardless of the outside air temperature. In particular, since the proportional sensitivity when the skylight 2 is opened is uniform, especially when the outside air temperature is high. Is too small, and this is also one of the factors in which the inside air temperature tin cannot maintain the cooling set temperature tCsp.
[0052]
[Outside air temperature correction for skylight control]
In order to avoid such a situation, in the present embodiment, the control amount for opening the skylight 2 is corrected according to the outside air temperature. Specifically, according to the following equation (1), the open-time proportional sensitivity when opening the skylight 2 is determined according to the difference between the target temperature and the outside air temperature.
Open proportional sensitivity = Set proportional sensitivity / [1+ (Sky window target temperature−Average outside air temperature for 15 minutes) × Outdoor air temperature window coefficient] (1)
[0053]
According to the above equation (1), in the summer season, the 15-minute average outside air temperature tout _Fifteen Rises, the skylight target temperature tRsp and the 15-minute average outside air temperature tout _Fifteen Is smaller, that is, the denominator for the set proportional sensitivity is smaller, and the open proportional sensitivity is larger. As a result, when the outside air temperature increases in summer, the skylight target temperature tRsp and the 15-minute average outside air temperature tout _Fifteen Is smaller), the opening amount of the skylight 2 increases, and the amount of hot air discharged to the outside increases. The same correction is made when the skylight 2 is closed.
[0054]
In this skylight control, when the CPU 8-1 detects rainfall based on a signal from the rain sensor 19, the CPU 8-1 closes the skylight 2. After the skylight 2 is fully closed, it may be opened to a predetermined rainfall window opening. Further, based on the wind speed from the wind speed sensor 17, the CPU 8-1 closes the skylight 2 even when the wind speed exceeds a predetermined window closing wind speed. In this case, even if the rain or the wind stops, the CPU 8-1 forcibly continues the forced closing operation of the skylight 2 by the interlock timer for 10 minutes. Further, the CPU 8-1 performs ventilation in the greenhouse 1 with the ventilation fan 9 during the closing operation of the skylight 2. At this time, similarly to the control of the opening amount of the skylight 2, the rotation speed of the ventilation fan 9 is controlled according to the difference between the outside curtain temperature tR and the control input temperature.
[0055]
[Insolation correction for skylight control]
The amount of hot air discharged from between the roof 1A and the curtain 22 also varies depending on the amount of solar radiation. In the above-described embodiment, the control amount when opening the skylight 2 is corrected according to the outside air temperature. However, the control amount may be corrected according to the amount of solar radiation. For example, based on the solar radiation amount S from the solar radiation amount sensor 16, the opening proportional sensitivity when the skylight 2 is opened may be corrected so as to increase as the solar radiation amount S increases.
[0056]
[Curtain control]
A first curtain 20, a second curtain 21, and a third curtain 22 are provided below the roof 1A in the greenhouse 1, and a fourth curtain 23 is provided on the roof 1A. The CPU 8-1 controls the expansion / removal of these curtains based on the inside air temperature tin and the amount of solar radiation S.
[0057]
In order to perform this curtain control, the control device 8 uses the personal computer 13 to set the curtain 1 withdrawal solar radiation S1ops, the curtain 1 forcible withdrawal temperature difference Δt1op, the set curtain extension solar radiation S1cls, the curtain 1 extension solar radiation hiss S1clh, and the curtain. 2, the withdrawal insolation S2op, the curtain 2 forcible withdrawal temperature difference Δt2op, the setting curtain 3 shading insolation S3cuts, the curtain 3 shading insolation hissing S3cuth, the setting curtain 4 shading insolation S4cuts, and the curtain 4 shading insolation hissing S4cuth. I do.
[0058]
[First curtain (for heat and cold insulation (transparent))
The operation of the first curtain 20 by the CPU 8-1 differs between the heating use time and the cooling use time. Hereinafter, the operation of extending / withdrawing the first curtain 20 by the CPU 8-1 will be described separately for the heating use time and the cooling use time.
[0059]
[Heating time (October to March)]
The CPU 8-1 obtains the curtain 1 withdrawal temperature top1, the curtain 1 withdrawal temperature tcl1, the curtain withdrawal temperature histop1h, and the curtain withdrawal temperature histic tcl1h from the heating set temperature tHsp. In the present embodiment, it is determined that top1 = tHsp + 4 ° C., tcl1 = tHsp−1.5 ° C., top1h = tHsp + 0.5 ° C., and tcl1h = tHsp−0.5 ° C. (see FIG. 6).
[0060]
[Extension]
The CPU 8-1 deploys the curtain 20 in the following priority order (1) and (2).
{Circle around (1)} When the inside air temperature tin is lower than the curtain 1 extension temperature tcl1 (tin <tcl1: see FIG. 6).
(2) 15-minute average solar radiation S _Fifteen Is smaller than the curtain 1 withdrawal solar radiation S1op (S15 <S1op: see FIG. 7A).
[0061]
However, in the extension control of the curtain 20, S _Fifteen Even if <S1op, if tin ≧ top1h, the extension of the curtain 20 is prohibited. When the outside air temperature is high, specifically, (tHsp-toout _Fifteen ) ≦ Δt1op (FIG. 7B), the extension of the curtain 20 is prohibited in any case.
[0062]
(Withdrawal)
The CPU 8-1 withdraws the curtain 20 in the following priority order (1), (2), and (3).
{Circle around (1)} When the inside air temperature tin is higher than the curtain 1 withdrawal temperature top1 (tin ≧ top1: see FIG. 6).
(2) When the outside air temperature is high, specifically, (tHsp-toout _Fifteen ) ≦ Δt1op (see FIG. 7B).
(3) 15-minute average solar radiation S _Fifteen Is greater than the insolation S1op of the curtain 1 withdrawal (S _Fifteen ≧ S1op: see FIG. 7 (c)).
[0063]
However, in the extension control of the first curtain 20, (tHsp-tout _Fifteen Even if ≦ Δt1op, withdrawal is prohibited when tin <top1h. Also, S _Fifteen Even if ≧ S1op, withdrawal is prohibited when tin <tcl1h.
[0064]
[Correction of curtain 1 withdrawal solar radiation to outside air temperature]
The CPU 8-1 corrects the curtain 1 withdrawal solar radiation S1op according to the outside air temperature. Specifically, according to the following equation (2), the curtain 1 withdrawal solar radiation S1op is increased in accordance with the decrease in the outside air temperature.
S1op = S1ops (setting curtain 1 withdrawal solar radiation) + S1α (shading solar radiation correction value) (2)
[0065]
The shaded solar radiation correction value S1α in the above equation (2) is obtained according to the following equation (3).
S1α = (tHsp-out) _Fifteen ) × KH1 (3)
In the equation (3), KH1 represents an outside temperature curtain coefficient, which is an increase (decrease) in the amount of withdrawal (expansion) solar radiation per 1 ° C. of the inside and outside temperature difference, and can be set as a value of 0 to 0.03.
[0066]
[Cooling use period (April to September)]
The CPU 8-1 sets, for example, 8:00 to 17:00 as the curtain 1 expansion time zone, and unconditionally expands the curtain 20 when the current time is within the curtain 1 expansion time zone. In other time zones, the 15-minute average solar radiation S _Fifteen Is greater than the curtain 1 spreading solar radiation amount S1cl (S _Fifteen > S1cl: see FIG. 7 (d)) _Fifteen In the case of <(S1cl-S1clh (curtain 1 extended solar radiation hiss)) (see FIG. 7E), the curtain 20 is withdrawn. When tin> top1 (curtain 1 withdrawal temperature) as an emergency, the curtain 20 is withdrawn unconditionally.
[0067]
[Outdoor temperature correction of curtain 1 spreading solar radiation]
The CPU 8-1 corrects the curtain 1 spreading solar radiation amount S1cl according to the outside air temperature. Specifically, according to the following equation (4), the curtain 1 spreading solar radiation amount S1cl is obtained according to the difference between the target temperature and the outside air temperature. Thereby, the curtain 1 spreading solar radiation amount S1cl decreases as the outside air temperature decreases.
S1cl = S1cls (setting curtain 1 spreading solar radiation) + S1β (shading solar radiation correction value) (4)
[0068]
The shaded solar radiation correction value S1β in the above equation (4) is obtained according to the following equation (5).
S1β = (tCsp-tout _Fifteen ) × KC1 (5)
In this equation (5), KC1 represents an outside temperature curtain coefficient, which is an increase (decrease) in the amount of withdrawal (expansion) insolation per 1 ° C. of the inside and outside temperature difference, and can be set as a value from 0 to 0.03.
[0069]
[Second curtain (for heat and cold insulation (silver))
The CPU 8-1 sets, for example, 4:00 to 8:00 as the curtain 2 withdrawal time zone and 16:00 to 20:00 as the curtain 2 extension time zone.
[0070]
During the curtain 2 withdrawal time period, the CPU 8-1 determines the 15-minute average solar radiation S _Fifteen Exceeds the curtain 2 withdrawal solar radiation S2op (S _Fifteen > S2op: The curtain 21 is withdrawn as shown in FIG.
In the curtain 2 extension time zone, the CPU 8-1 determines the 15-minute average solar radiation S _Fifteen Falls below the curtain 2 withdrawal solar radiation S2op (S _Fifteen <S2op: See FIG. 8B) The curtain 21 is extended.
[0071]
In addition, the CPU 8-1 sets | tHsp-tout during the heating use time in the curtain 2 withdrawal time zone. _Fifteen When | <Δt2op (see FIG. 8C), the curtain 21 is withdrawn.
[0072]
[Third curtain (shading (black))
The CPU 8-1 determines that the 15-minute average solar radiation amount S15 is equal to the curtain 3 shaded solar radiation amount S3cut (about 0.2 to 0.5 cal / cm). ^Two min) (S _Fifteen > S3cut: See FIG. 9 (a)), extend the curtain 22 and _Fifteen When <(S3cut-S3cuth) (see FIG. 9B), the curtain 22 is withdrawn.
[0073]
[Correction of the outside temperature of the curtain 3 shaded solar radiation]
The CPU 8-1 corrects the curtain 3 shaded solar radiation S3cut in accordance with the outside air temperature. Specifically, according to the following formula (6) during the heating use time and according to the following formula (8) during the cooling use time, the curtain 3 light-shielding solar radiation amount S3cut is obtained according to the difference between the target temperature and the outside air temperature. Thereby, the curtain 3 light-shielding solar radiation amount S3cut increases as the outside air temperature decreases.
[0074]
(Heating period)
S3cut = S3cuts (set curtain 3 light-shielded solar radiation amount) + S3α (light-shielded solar radiation correction value) (6)
[0075]
The shaded solar radiation correction value S3α in the above equation (6) is obtained according to the following equation (7).
S3α = (tHsp-tout _Fifteen ) × KH3 (7)
In the equation (7), KH3 represents an outside temperature curtain coefficient, which is an increase (decrease) in the amount of withdrawn (extended) solar radiation per 1 ° C. of the inside and outside temperature difference, and can be set as a value from 0 to 0.03.
[0076]
(Cooling use period)
S3cut = S3cuts (set curtain 3 light-shielded solar radiation amount) + S3β (light-shielded solar radiation correction value) (8)
The shaded solar radiation correction value S3β in the above equation (8) is obtained according to the following equation (9).
S3β = (tCsp-tout _Fifteen ) × KC3 (9)
[0077]
In this equation (9), KC3 represents an outside temperature curtain coefficient, which is an increase (decrease) in the amount of withdrawal (expansion) insolation per 1 ° C. of the inside and outside temperature difference, and can be set as a value from 0 to 0.03.
[0078]
[The fourth curtain (shading (black))]
The CPU 8-1 calculates the 15-minute average solar radiation S _Fifteen The curtain 4 shaded sunlight S4cut (about 1cal / cm ^Two min) (S _Fifteen > S4cut: See FIG. 10 (a)), extend the curtain 23, and _Fifteen When <(S4cut-S4cuth) (see FIG. 10 (b)), it is withdrawn.
[0079]
[Outdoor temperature correction of curtain 4 light-shielded solar radiation]
The CPU 8-1 corrects the curtain 4 light-irradiation amount S4cut in accordance with the outside air temperature. Specifically, according to the following formula (10) during the heating use time and according to the following formula (12) during the cooling use time, the curtain 4 light-shielding solar radiation amount S4cut is obtained according to the difference between the target temperature and the outside air temperature. As a result, the curtain 4 light-shielding solar radiation amount S4cut increases as the outside air temperature decreases.
[0080]
(Heating period)
S4cut = S4cuts (setting curtain 4 shading solar radiation amount) + S4α (shading solar shading correction value) (10)
The shaded solar radiation correction value S4α in the above equation (10) is obtained according to the following equation (11).
S3α = (tHsp-tout _Fifteen ) × KH4 (11)
[0081]
In the equation (11), KH4 indicates an outside temperature curtain coefficient, which is an increase (decrease) in the amount of withdrawn (extended) solar radiation per 1 ° C. of the inside and outside temperature difference, and can be set as a value of 0 to 0.03.
[0082]
In the present embodiment, the outside temperature curtain coefficient KH4 may be equal to the outside temperature curtain coefficient KH3 used in the above equation (3). In this case, the shading solar radiation correction value S3α obtained in the equation (3) is set to S4α. Used as
[0083]
(Cooling use period)
S4cut = S4cuts (setting curtain 4 shading solar radiation amount) + S4β (shading solar shading correction value) (11)
The shaded solar radiation correction value S4β in the above equation (11) is obtained according to the following equation (12).
S4β = (tCsp-tout _Fifteen ) × KC4 (12)
[0084]
In the equation (12), KC4 indicates an outside temperature curtain coefficient, which is an increase (decrease) in the amount of withdrawn (extended) solar radiation per 1 ° C. of the inside and outside temperature difference, and can be set as a value of 0 to 0.03.
[0085]
In the present embodiment, the outside temperature curtain coefficient KC4 may be equal to the outside temperature curtain coefficient KC3 used in the above equation (5). In this case, the shading solar radiation correction value S3β obtained in the equation (5) is set to S4β. Used as
[0086]
In the present embodiment, the heating set temperature tHsp and the cooling set temperature tCsp may be set for each time zone by dividing a day into, for example, four time zones.
Further, in the present embodiment, as an example of the external environment, the heating set temperature tHsp, the cooling set temperature tCsp, and the control amount when the skylight 2 is opened are corrected based on the outside air temperature and the amount of solar radiation. It is not limited to temperature and solar radiation.
[0087]
【The invention's effect】
As is apparent from the above description, according to the present invention, the heating set temperature is corrected according to the external environment such as the external temperature and the amount of solar radiation, and the heating control in the greenhouse is performed according to the corrected heating set temperature. In addition, the cooling set temperature is corrected according to the external environment such as the external temperature and the amount of solar radiation, and the cooling control in the greenhouse is performed according to the corrected cooling set temperature. Variations in the inside air temperature in the greenhouse due to the external environment can be suppressed, the flowering time of plants such as Phalaenopsis orchid can be adjusted, and suitable conditions suitable for the plants can be created.
Further, according to the present invention, the control amount when opening the skylight is corrected by the external environment such as the external temperature and the amount of solar radiation, and in the summer, when the outside air temperature increases or the amount of solar radiation increases, the skylight To increase the amount of hot air, increase the amount of hot air emitted, suppress fluctuations in inside air temperature, adjust the flowering time of plants such as Phalaenopsis orchids, and make suitable conditions suitable for plants Become like
Further, since the opening / closing set value of the heat retaining curtain is corrected in accordance with a change in the load of cooling and heating due to a change in outside weather, a suitable indoor environment of the plant and energy saving are achieved.
In addition, the opening and closing setting value of the blackout curtain is corrected by changes in outside weather, so early shading in the summer reduces the risk of leaf burning, and in winter, as much light as possible during short sunshine hours, Lighting and energy saving suitable for growth are achieved.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an example of an environment control device used for carrying out a greenhouse environment control method according to the present invention.
FIG. 2 is a block diagram illustrating a schematic configuration of a control device in the environment control device.
FIG. 3 is a flowchart showing a process of correcting an outside air temperature of a heating set temperature periodically performed by a CPU of the control device.
FIG. 4 is a flowchart showing an external air temperature correction process of a cooling set temperature that is periodically performed by a CPU of the control device.
FIG. 5 is a flowchart illustrating a correction operation of a heating set temperature and a cooling set temperature in an intermediate period performed by a CPU of the control device.
FIG. 6 is a diagram showing the relationship between the curtain 1 withdrawal temperature, the curtain 1 withdrawal temperature, the curtain withdrawal temperature hiss, and the curtain withdrawal temperature hiss determined from the heating set temperature.
FIG. 7 is a diagram for explaining curtain control (control of a first curtain) performed by a CPU of the control device.
FIG. 8 is a diagram for explaining curtain control (control of a second curtain) performed by a CPU of the control device.
FIG. 9 is a diagram for explaining curtain control (control of a third curtain) performed by a CPU of the control device.
FIG. 10 is a diagram for explaining curtain control (control of a fourth curtain) performed by a CPU of the control device.
FIG. 11 is a schematic configuration diagram showing an example of a conventional greenhouse used for growing Phalaenopsis orchid.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Greenhouse, 1A ... Roof, 2 ... Skylight, 3 ... Roof, 7 ... Sensor outside a curtain, 8 ... Control device, 8-1 ... CPU, 8-2 ... RAM, 8-3 ... ROM, 8-4, 8 -5: Interface, 9: Ventilation fan, 10: Inside air temperature sensor, 11: Inside air humidity sensor, 12: Cooling / heating device, 13: Personal computer, 14 ... Outside air temperature sensor, 15: Humidity sensor, 16: Solar radiation sensor, 17 ... Wind direction sensor, 18 wind speed sensor, 19 rain sensor, 20 first curtain, 22 second curtain, 23 third curtain, 24 fourth curtain, 4, 22 to 27 motor.

Claims (10)

Determine a heating set temperature and a cooling set temperature, perform heating when the inside air temperature in the greenhouse falls below the heating set temperature, and perform cooling when the inside air temperature in the greenhouse exceeds the cooling set temperature. In the environmental control method,
An environment control method for a greenhouse, wherein the heating set temperature and the cooling set temperature are corrected according to an external environment. The temperature between the roof of the greenhouse and the curtain extended under the roof is defined as the outside temperature of the curtain, and the skylight provided on the roof of the greenhouse according to the difference between the outside temperature of the curtain and a predetermined target temperature. In an environment control method for a greenhouse that controls an opening amount of a greenhouse,
A method for controlling an environment in a greenhouse, wherein a control amount for opening the skylight is corrected according to an external environment. 3. The method for controlling an environment in a greenhouse according to claim 1, wherein the external environment is an outside air temperature. The method of controlling an environment in a greenhouse according to claim 1 or 2, wherein the external environment is an amount of solar radiation. Inside air temperature measuring means for measuring the inside air temperature in the greenhouse, heating control means for heating when the measured value of the inside air temperature falls below a predetermined heating set temperature, and the measured value of the inside air temperature is predetermined. In a greenhouse environment control device including cooling control means for performing cooling when the temperature exceeds the set cooling temperature,
An environment control apparatus for a greenhouse, comprising: a set temperature correction unit that corrects the heating set temperature and the cooling set temperature according to an external environment. Outside curtain temperature measurement means for measuring the temperature between the roof of the greenhouse and the curtain extended under this roof as the outside curtain temperature, and the difference between the measured value of the outside curtain temperature and a predetermined target temperature. A skylight control means for controlling an opening amount of a skylight provided on a roof of the greenhouse in accordance with the above,
An environment control device for a greenhouse, comprising: a skylight control amount correction unit that corrects a control amount when the skylight is opened according to an external environment. 7. The greenhouse environment control device according to claim 5, wherein the outside environment is an outside air temperature. The greenhouse environment control device according to claim 5 or 6, wherein the external environment is the amount of solar radiation. Determine a heating set temperature and a cooling set temperature, perform heating when the inside air temperature in the greenhouse falls below the heating set temperature, and perform cooling when the inside air temperature in the greenhouse exceeds the cooling set temperature. In the environmental control method,
The difference between the heating set temperature and the outside air temperature is obtained as an outside air temperature difference, the outside air temperature is multiplied by a predetermined heating addition coefficient to obtain an added amount, and the added amount is added to the heating set temperature. Determining a corrected heating set temperature;
The difference between the cooling set temperature and the outside air temperature is determined as the outside air temperature difference, the added amount is obtained by multiplying the outside air temperature by a predetermined cooling additional coefficient, and the added amount is added to the cooling set temperature. Obtaining a corrected cooling set temperature. The temperature between the roof of the greenhouse and the curtain extended under the roof is defined as the outside temperature of the curtain, and the skylight provided on the roof of the greenhouse according to the difference between the outside temperature of the curtain and a predetermined target temperature. In an environment control method for a greenhouse that controls an opening amount of a greenhouse,
A method for controlling the environment in a greenhouse, wherein a difference between the target temperature and the outside air temperature is obtained, and a proportional sensitivity when the skylight is opened is corrected according to the difference.

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