JP6274887B2 - Greenhouse air conditioning system - Google Patents

Description

  The present invention relates to a greenhouse air conditioning system.

  Generally, in many cases, the fuel used for heating a facility gardening house uses oil or the like, and the recent increase in crude oil prices has put pressure on the management of facility gardening farmers. In particular, institutional horticultural farmers who produce crops with high cultivation temperatures such as tomatoes, peppers and roses consume a large amount of oil and suffer from rising fuel costs. On the other hand, from the viewpoint of global warming countermeasures, greenhouse gas reduction is an urgent issue, and there has been a demand for facility horticultural farmers who perform house cultivation.

  Various studies have been conducted to reduce fuel costs for greenhouses such as greenhouses. For example, the greenhouse facility described in Non-Patent Document 1 embeds a large number of PVC pipes in the underground 400 mm to 500 mm under the greenhouse, and circulates the air in the greenhouse in the PVC pipes by an air circulation fan. During the daytime, when the temperature in the greenhouse reaches 26 ° C. or higher, the air circulation fan is activated, and the warm air in the greenhouse is passed through the PVC pipe to accumulate heat energy in the ground. When the temperature in the greenhouse is more than 8 ° C and less than 26 ° C, the air circulation fan is stopped, and when the temperature in the greenhouse at night is 8 ° C or less, the air circulation fan is activated to cool the cold air in the greenhouse to the PVC pipe. By circulating it to the heat source, the heat energy accumulated in the ground is reduced into the greenhouse to suppress the temperature drop in the greenhouse.

  In addition, for example, the greenhouse facility described in Patent Document 1 sends warm air above the greenhouse to a pipe embedded in the ground, and ejects it from a number of nozzles provided in the pipe so as to increase the ground temperature. I have to.

Tokushima Prefectural Agricultural Experiment Station Test Research Report No. 20 1982 Study on Practical Use of Facility Vegetable Cultivation by Ground Heat Exchange Heating System (Part 1)

Japanese Patent Publication No. 48-34858

  However, in Non-Patent Document 1, although it is said that the practical use of the greenhouse facility has been proved, it has not yet spread. This is probably because important factors for crops such as greenhouse temperature, humidity and carbon dioxide concentration are not adjusted to the level necessary for growth.

  Moreover, since the greenhouse facility of patent document 1 is what only sends the warm air of the greenhouse upper part to the pipe embed | buried in the ground, and is ejected in the ground, the subject similar to the greenhouse facility of nonpatent literature 1 is the same. It is thought that there is.

  An object of the present invention is to provide a greenhouse air conditioning system in which important factors for a crop such as temperature, humidity, and carbon dioxide concentration in the greenhouse can be adjusted at a level necessary for growing the crop.

The greenhouse air-conditioning system according to the present invention includes a first air flow path extending from the upper part of the greenhouse to the outside of the greenhouse through the first underground pipe buried in the ground below the greenhouse, A second air flow path that reaches the inside of the greenhouse via a second underground pipe buried in the ground, and a third air flow path that returns from inside the greenhouse to the greenhouse via the first underground pipe. Pipes that can be formed, a blower for flowing air through the air flow path, a temperature sensor that detects a temperature at a predetermined position in a greenhouse, and a temperature detected by the temperature sensor is equal to or higher than a predetermined first temperature When the air flows through only the first and second air flow paths among the first to third air flow paths, the temperature detected by the temperature sensor is equal to or lower than a predetermined second temperature lower than the first temperature. At this time, of the first to third air flow paths, the temperature is provided with flow path control means for flowing air only through the third air flow path. In the air conditioning system, said second flow path and greenhouses portion located inside of the third flow path is composed of a plurality of indoor outlet pipe disposed parallel to the ground, the lower portion of the indoor outlet pipe, A plurality of exhaust holes for exhausting the air in the tube to the greenhouse are formed at predetermined intervals .

  According to the greenhouse air conditioning system having such a configuration, the first to third airs when the temperature in the greenhouse is equal to or higher than the first temperature (for example, 25 ° C.) in the winter when the temperature is relatively high (daytime). Of the flow paths, only the first air flow path and the second air flow path are formed. By the first air flow path, the warm air in the upper part of the greenhouse is exhausted outside the greenhouse via the first underground pipe buried in the ground below the greenhouse, so that the first underground pipe and the underground Thermal energy is accumulated. In addition, since the outside air is introduced into the greenhouse through the second underground pipe buried in the ground under the greenhouse from the outside of the greenhouse by the second air flow path, it is discharged when crops are photosynthesised during the day. Water vapor prevents the humidity in the greenhouse from becoming excessively high. In addition, according to the second air flow path, since the outside air is introduced into the greenhouse through the ground, the cold winter air in the winter is warmed up through the ground, and the temperature inside the greenhouse due to the introduction of the outside air is increased. Reduction is suppressed. On the other hand, when the temperature in the greenhouse becomes equal to or lower than the second temperature in the time zone (nighttime) when the temperature is relatively low in winter, only the third air flow path is formed among the first to third air flow paths. According to the third air flow path, the air in the greenhouse passes through the first underground pipe buried in the ground below the greenhouse and returns to the greenhouse, but the first underground pipe and the underground in the vicinity thereof Since the thermal energy is accumulated during the day, the air in the greenhouse is warmed and returned to the greenhouse when passing through the first underground pipe. For this reason, the temperature fall in a greenhouse is suppressed. In addition, according to the third air flow path, since the air in the greenhouse and the outside air are not exchanged, the carbon dioxide gas discharged by the crop can be accumulated in the greenhouse at night. This can be expected to compensate for the carbon dioxide concentration in the greenhouse, which drops significantly during the day.

  In the greenhouse air conditioning system, when the temperature detected by the temperature sensor is higher than the second temperature and lower than the first temperature, the flow path control means may set any of the first to third air flow paths. It is desirable to control the air so that it does not flow.

  In the greenhouse air conditioning system described above, the portions of the second flow path and the third flow path that are disposed in the greenhouse are configured by piping that is disposed in parallel to the ground, and the exhaust holes that exhaust the air in the piping are piping. It is desirable that a plurality are formed in the lower part.

  In the greenhouse air-conditioning system, it is desirable to further include a water droplet collection container embedded in a position lower than the first underground pipe and connected to the first underground pipe.

  According to the present invention, it can be expected that important factors for crops such as temperature, humidity, and carbon dioxide concentration in a greenhouse can be adjusted at a level necessary for growing.

It is the schematic which shows the air conditioning system of the greenhouse which concerns on embodiment of this invention. It is a figure which shows the positional relationship of installation height, such as a 1st underground pipe, a 2nd underground pipe, and an indoor blowing pipe. (A) represents the connection relationship with the upper and lower communication pipes 27, and (b) represents the connection relationship with the upper and lower communication pipes 26. It is the schematic which shows the air conditioning system of the greenhouse which concerns on embodiment of this invention, Comprising: It is a figure which shows the state in which the 2nd air flow path is formed. It is the schematic which shows the air conditioning system of the greenhouse which concerns on embodiment of this invention, Comprising: It is a figure which shows the state in which the 1st and 2nd air flow path is formed. It is the schematic which shows the air conditioning system of the greenhouse which concerns on embodiment of this invention, Comprising: It is a figure which shows the state in which the 2nd air flow path is formed. It is the schematic which shows the air conditioning system of the greenhouse which concerns on embodiment of this invention, Comprising: It is a figure which shows the state which the flow of air has stopped. It is the schematic which shows the air conditioning system of the greenhouse which concerns on embodiment of this invention, Comprising: It is a figure which shows the state in which the 3rd air flow path is formed. It is the schematic which shows the air conditioning system of the greenhouse which concerns on embodiment of this invention, Comprising: It is a figure which shows the state in which the 2nd air flow path is formed by the spring / summer mode. It is a flowchart for demonstrating the operation state of a 1st air blower. It is a flowchart for demonstrating the operation state of a 2nd air blower. It is a flowchart for demonstrating the switching state of a switching valve.

  Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a greenhouse air conditioning system 1 according to an embodiment of the present invention includes a greenhouse 2, piping 3, a temperature sensor 4, switching valves 6 and 7, blowers 8 and 9, a water droplet collection container. 10 and a control device 11 and the like.

  The greenhouse 2 is made of, for example, a glass or vinyl building constructed so as to easily keep the internal temperature constant.

  The piping 3 includes an upper air introduction pipe 12, a first underground pipe 13, a first exhaust pipe 14, an indoor outlet pipe 16, an external air introduction pipe 17, a second underground pipe 18, a second exhaust pipe 19, and the like. It consists of piping. For the piping 3, for example, a hard polyvinyl chloride pipe (for example, JIS K 6741 VU equivalent) can be used.

  The upper air introduction pipe 12 is erected from the upper part of the greenhouse 2 (above 1/2 of the total height of the greenhouse) to the ground below the greenhouse. A blower 8 (hereinafter also referred to as “first blower 8”) is provided in the middle of the upper air introduction pipe 12. The upper air introduction pipe 12 sucks relatively high-temperature air from the suction port 12a at the upper end in the greenhouse 2 by the operation of the blower 8, and introduces the air into the first underground pipe 13 described later. In addition, if possible, it is desirable that the suction port 12a be at the uppermost part in the greenhouse where the temperature in the greenhouse becomes the highest.

  A plurality of the first underground pipes 13 are embedded in the ground under the greenhouse in a substantially horizontal state. The first underground pipes 13 are embedded in parallel to each other, and upstream communication pipes 21 extending in a perpendicular direction are connected to upstream ends of the plurality of first underground pipes 13. The downstream end of the upper air introduction pipe 12 is also connected to the communication pipe 21. Further, downstream communication pipes 22 extending at right angles are connected to the vicinity of the downstream ends of the plurality of first underground pipes 13. A first exhaust pipe 14 described later is connected to the communication pipe 22. In the present embodiment, a pipe having a diameter of about 100 mm is used as the first underground pipe 13, and the embedding depth (distance from the ground to the top of the pipe) is 500 mm as shown in FIG. ing. Further, the eight first underground pipes 13 are evenly arranged under the greenhouse.

  The downstream end of the first exhaust pipe 14 is exposed on the ground 5 outside the greenhouse. Thereby, the air introduced into the first underground pipe 13 can be exhausted outside the greenhouse 2 through the downstream communication pipe 22 and the first exhaust pipe 14.

  A plurality of indoor outlet pipes 16 are arranged in the greenhouse 2 substantially horizontally (in parallel to the ground) along the longitudinal direction of the greenhouse 2. The indoor outlet pipe 16 is connected to indoor communication pipes 23 and 24 extending in the direction perpendicular to the upstream end and the vicinity of the upstream end, respectively. The communication pipe 24 is connected to an upper and lower communication pipe 27 that communicates with the downstream connection pipe 22, and the communication pipe 23 is connected to an upper and lower communication pipe 26 that communicates with a downstream communication pipe 29 described later. In addition, a plurality of exhaust holes 16a for exhausting the air in the pipe to the greenhouse 2 are formed in the lower part of the indoor outlet pipe 16 at a predetermined interval. In the present embodiment, the installation height position of the indoor outlet pipe 16 (distance from the ground to the lowest part of the pipe) is 200 mm as shown in FIG. The book's indoor outlet pipes 16 are arranged in parallel.

  The first switching valve 6 is configured by an electromagnetic valve or the like, and in accordance with a command from the control device 11, an exhaust position where the first underground pipe 13 and the first exhaust pipe 14 communicate with each other, or the first underground pipe 13 and the upper and lower sides. The position of the valve body can be switched to any one of the internal air circulation positions that communicate with the communication pipe 27. When the valve body of the first switching valve 6 is in the exhaust position, as shown in FIG. 4, the air flow path A (hereinafter “ Also referred to as “first air flow path A”). Further, as shown in FIG. 7, when the valve body of the first switching valve 6 is in the inside air circulation position, the air flow path C (hereinafter referred to as “returning into the greenhouse 2” from the greenhouse 2 through the ground below the greenhouse 2). (Also referred to as “third air flow path C”).

  The external air introduction pipe 17 is erected from the outside of the greenhouse 2 to the ground below the greenhouse. A blower 9 (hereinafter also referred to as “second blower 9”) is provided in the middle of the external air introduction pipe 17. The external air introduction pipe 17 sucks air outside the greenhouse 2 from the suction port 17a at the upper end by the operation of the blower 9, and introduces it into a second underground pipe 18 described later.

  A plurality of second underground pipes 18 are embedded in the ground below the greenhouse in a substantially horizontal state. Each of the second underground pipes 18 is buried in parallel to each other, and upstream communication pipes 28 extending in a perpendicular direction are connected to upstream ends of the plurality of second underground pipes 18. A downstream end of the external air introduction pipe 17 is also connected to the upstream communication pipe 28. In addition, downstream end portions of the plurality of second underground pipes 18 are connected to downstream communication pipes 29 extending at right angles to the second underground pipes 18. A second exhaust pipe 19 to be described later is connected to the downstream side communication pipe 29. In the present embodiment, a pipe having a diameter of about 100 mm is also used for the second underground pipe 18, and as shown in FIG. 2, the embedding depth (distance from the ground to the top of the pipe) is 720 mm. ing. In addition, eight second underground pipes 13 are arranged in parallel.

  The first underground pipes 13 and the second underground pipes 18 are alternately arranged so as not to overlap each other when viewed from above. Further, the second underground pipe 18 is embedded at a position deeper than the first underground pipe 13 by a predetermined depth (200 mm in this embodiment). The reason why the first underground pipe 13 and the second underground pipe 18 are in such a positional relationship is that the first ground that accumulates thermal energy in the ground during the day and collects the accumulated thermal energy at night. This is to prevent the second underground pipe 18 from affecting the intermediate pipe 13. Moreover, it is also for making it difficult to receive the influence of ground temperature by embedding the 2nd underground pipe 18 in a deeper position. Thereby, in the summer, the outside air is cooled and introduced into the greenhouse 2 when passing through the second underground pipe 18, and in the winter, the outside air is warmed when passing through the second underground pipe 18 to 2 can be expected to be introduced.

  The second exhaust pipe 19 is connected to the downstream communication pipe 29, and its downstream end is exposed on the ground 5 outside the greenhouse 2. Thereby, the air introduced into the second underground pipe 18 can be exhausted outside the greenhouse through the downstream side communication pipe 29 and the second exhaust pipe 19.

  The second switching valve 7 is configured by an electromagnetic valve or the like, and, according to a command from the control device 11, is an outside air introduction position where the second underground pipe 18 and the upper and lower communication pipes 26 communicate with each other, or the second underground pipe 18 and the second underground pipe 18. 2 The position of the valve body can be switched to any one of the exhaust positions communicating with the exhaust pipe 19. When the valve body of the second switching valve 6 is in the outside air introduction position, as shown in FIGS. 3 and 4, an air flow path B (hereinafter referred to as “inside the greenhouse 2” from the outside of the greenhouse 2 through the underground of the greenhouse) Also referred to as “second air flow path B”).

  The water droplet collection container 10 collects water droplets generated by condensation in the first underground pipe 13 and prevents high-humidity air from being introduced into the greenhouse 2. That is, during the day, water droplets generated by dew condensation generated when the warm air in the upper part of the greenhouse 2 passes through the first underground pipe 13 and is cooled are buried at a position lower than the first underground pipe 13. The water is collected in a water droplet collection container 10 connected to the underground pipe 13 via a pipe. Further, in order to efficiently collect water droplets in the first underground pipe 13 in the water droplet collection container 10, a slight gradient is set so that the connection portion of the first underground pipe 13 to the water droplet collection container 10 is at the lowest position. Is formed. A check valve 32 is also provided to prevent water or mud from flowing back from the water droplet collection container 10 to the first underground pipe 13 side when the ground is irrigated by heavy rain.

  The control device 11 controls the fans 8 and 9 and the switching valves 6 and 7 based on the temperature detected by the temperature sensor 4 installed at a predetermined position in the greenhouse 2, the operation mode described later, and the time zone, Therefore, air flow path control is performed. In the present embodiment, the temperature sensor 4 is installed in the greenhouse 2 at the same height as the suction port 12 a of the upper air introduction pipe 12. The control device 11 is provided with a mode selection operation unit 31. The mode selection operation unit 31 allows the user to select three types: a winter mode, a spring / summer mode, and a full stop mode.

<Winter mode>
First, a case where the winter mode is selected by the mode selection operation unit 31 will be described. When the winter mode is selected, as shown in FIG. 3, the second blower 9 automatically starts operation at AM7. The first blower 8 stops operation when the temperature in the greenhouse is lower than 25 ° C., and starts operation when the temperature in the greenhouse 2 rises to 25 ° C. or more as shown in FIG. . When the winter mode is selected, the valve body of the first switching valve 6 is in the exhaust position, and the valve body of the second switching valve 7 is in the outside air introduction position.

  Therefore, during the daytime (in this embodiment, AM7 to PM7 o'clock is the daytime and PM7 o'clock to AM7 o'clock is the nighttime, but in the application of the present invention, the daytime and nighttime time zones are However, before the temperature in the greenhouse 2 reaches 25 ° C. or higher, only the second air flow path B is formed by the operation of the second blower 9, as shown in FIG. Outside air is introduced into the greenhouse 2 via the second underground pipe 18. During the day, water vapor is discharged when crops grown in the greenhouse are photosynthesised. By introducing the outside air in this way, the humidity in the greenhouse 2 is prevented from being excessively increased by the water vapor. Moreover, since the outside air introduced into the greenhouse 2 is warmed by the underground heat when passing through the ground and introduced into the greenhouse 2, the temperature inside the greenhouse 2 is affected by the introduction of outside air during the winter season. Hateful. Further, the outside air is blown out from a plurality of exhaust holes 16 a provided in the lower part of the indoor outlet pipe 16 disposed in the greenhouse 2 substantially horizontally along the longitudinal direction of the greenhouse 2 and introduced into the greenhouse 2. Therefore, relatively dry outside air is widely distributed in the greenhouse 2.

  During the day, when the temperature in the greenhouse 2 rises to 25 ° C. or higher, the first blower 8 automatically starts operation, and as shown in FIG. The warm air in the upper part is discharged outside the greenhouse 2 through the first underground pipe 13. Thereby, while the excessive temperature rise in the greenhouse 2 is suppressed, the thermal energy for night use is accumulate | stored in the 1st underground pipe 13 and underground.

  Thereafter, when the temperature in the greenhouse 2 decreases to 20 ° C. or less during the daytime, the first blower 8 stops operating and the first air flow path A disappears as shown in FIG. When the temperature in the greenhouse 2 rises again to 25 ° C. or higher, the first blower 8 starts operation again, and the first air flow path A is formed. By these operations, heat energy can be accumulated in the ground while securing the temperature required for the greenhouse 2 during the day.

  Thereafter, at the start of the night (PM7), the second blower 9 automatically stops operation. When the temperature in the greenhouse 2 is higher than 10 ° C., the first blower 8 also stops operation. In this case, as shown in FIG. 6, the circulation of air stops as a whole.

  After that, at night (from 7:00 PM to 7:00 AM), when the temperature in the greenhouse 2 decreases to 10 ° C. or less, the first blower 8 automatically starts operation, and the first switching valve 6 is in the internal air circulation position. The second switching valve 7 is switched to the exhaust position. As a result, as shown in FIG. 7, a third air flow path C is formed, and the air in the greenhouse 2 passes through the first underground pipe 13 embedded in the ground below the greenhouse and returns to the greenhouse 2. To do. Since heat energy is accumulated during the daytime in the underground of the first underground pipe 13 and the vicinity thereof, the temperature of the air in the greenhouse 2 is increased when passing through the first underground pipe 13 and the greenhouse. It returns to the inside 2 and the temperature drop in the greenhouse 2 is suppressed. In addition, the air flowing back into the greenhouse 2 is ejected from a plurality of exhaust holes 16 a provided in the lower part of the indoor outlet pipe 16 disposed in the greenhouse 2 substantially horizontally along the longitudinal direction of the greenhouse 2. Since the air is recirculated into the greenhouse 2, the warmed air is widely distributed in the greenhouse 2, and at the same time, a radiant heat effect of the heat accumulated in the indoor outlet pipe 16 itself during the day can be expected.

  Moreover, since the air in the greenhouse 2 is not exhausted outside the greenhouse 2 and there is no air inside and outside the greenhouse 2, the carbon dioxide concentration in the greenhouse 2 is maintained throughout the night, and the crops photosynthesize during the day. The carbon dioxide consumed can be supplemented.

<Spring and Summer Mode>
When the spring / summer mode is selected by the mode selection operation unit 31, the first blower 8 is not operated, and the second blower 9 is operated for 24 hours. In this case, the first switching valve 6 is in the exhaust position, and the second switching valve 7 is in the outside air introduction position. Thereby, as shown in FIG. 8, the second air flow path B is formed, the outside air is cooled when passing through the second underground pipe 18, and air having a temperature lower than the outside air is supplied into the greenhouse 2. The Thereby, it is prevented that the temperature in the greenhouse 2 rises excessively in the spring and summer, and it can be expected that the work efficiency of the worker is increased, the heat stroke is prevented, and the cultivation of crops that are not suitable for high temperatures is performed.

<All stop mode>
When the all stop mode is selected by the mode selection operation unit 31, the first blower 8 and the second blower 9 are stopped. The first switching valve 6 is in the exhaust position, and the second switching valve 7 is in the outside air introduction position. This all stop mode is usually selected at a time when crop cultivation is not performed or during maintenance.

<Control example>
Hereinafter, an example of the control performed by the control device 11 for the first blower 8, the second blower 9, the first switching valve 6, and the second switching valve 7 will be described based on the flowcharts of FIGS.

  First, the 1st air blower 8 is demonstrated based on FIG. The first blower 8 is in a stopped state when a mode other than the winter mode is selected (ST1: NO) (ST2). The winter mode is selected (ST1: YES), and during the daytime (for example, AM 7:00 to PM 7:00) (ST3: YES), the temperature in the greenhouse 2 detected by the temperature sensor 4 is 25 ° C. or higher. In the case of (ST4: YES), the vehicle is operated (ST5). On the other hand, when the temperature in the greenhouse 2 is 20 ° C. or lower (ST6: YES), the operation is stopped (ST7). When the temperature in the greenhouse 2 is higher than 20 ° C. and lower than 25 ° C. (ST4: NO, ST6: NO), the operation state or the stop state is continued (ST8).

  The winter mode is selected (ST1: YES), and during the night (for example, PM7 to AM7) (ST3: NO), the temperature in the greenhouse 2 detected by the temperature sensor 4 is 10 ° C. or lower. In case (ST9: YES), the vehicle is operated (ST10), and when the temperature is over 10 ° C. (ST9: NO), the operation is stopped (ST2).

  The 25 ° C. in ST4, 20 ° C. in ST6, 10 ° C. in ST9, and day / night time zones are examples of control threshold temperatures. The boundary time between midnight and night should be determined as appropriate according to the type of crop and the construction area of the greenhouse.

  Next, the second blower 9 will be described with reference to FIG. When the winter mode is selected (ST21: YES), the second blower 9 operates during the daytime (for example, AM7 to PM7) (ST22: YES), operates (ST23), and operates at night (for example, PM7) To AM7) (ST22: NO), and stops (ST24). Moreover, when the spring / summer mode is selected (ST21: NO, ST25: YES), the second blower 9 performs a 24-hour operation (ST26). On the other hand, when the all stop mode is selected (ST21: NO, ST25: NO), the second blower 9 enters a stopped state (ST24).

  Next, the first switching valve 6 and the second switching valve 7 will be described with reference to FIG. When the winter mode is selected (ST31: YES), during the daytime (for example, AM7 to PM7) (ST32: YES), the first switching valve 6 is in the exhaust position, and the second switching valve 7 is This is the outside air introduction position (ST33). Also, when a mode other than the winter mode is selected (ST31: NO), the first switching valve 6 is in the exhaust position, and the second switching valve 7 is in the outside air introduction position (ST33).

  When the winter mode is selected (ST31: YES), during the night (for example, PM7 to AM7) (ST32: NO), the temperature in the greenhouse 2 detected by the temperature sensor 4 is 10 ° C. or lower. (ST34: YES), the first switching valve 6 is in the inside air circulation position, and the second switching valve 7 is in the exhaust position (ST35). On the other hand, when the temperature in the greenhouse 2 detected by the temperature sensor 4 exceeds 10 ° C. (ST34: NO), the first switching valve 6 is in the exhaust position and the second switching valve 7 is in the outside air introduction position. (ST33).

A 1st air flow path B 2nd air flow path C 3rd air flow path 1 Greenhouse air conditioning system 2 Greenhouse 3 Pipings 4 Temperature sensor 6 1st switching valve (flow path control means)
7 Second switching valve (flow path control means)
8 First blower 9 Second blower 10 Water droplet collection container 11 Control device (flow path control means)
13 First underground pipe 16 Indoor outlet pipe 16a Exhaust hole 18 Second underground pipe

Claims (4)

A first air passage extending from the upper part of the greenhouse to the outside of the greenhouse via the first underground pipe buried in the ground below the greenhouse, and the second underground buried from outside the greenhouse to the ground below the greenhouse Pipes capable of forming a second air flow path leading into the greenhouse via a pipe and a third air flow path returning from the greenhouse through the first underground pipe into the greenhouse; and the air flow A blower for flowing air through the road, a temperature sensor for detecting the temperature at a predetermined position in the greenhouse, and the first to third air flow paths when the temperature detected by the temperature sensor is equal to or higher than a predetermined first temperature Air flows only through the first and second air flow paths, and the first to third air flows when the temperature detected by the temperature sensor is equal to or lower than a predetermined second temperature lower than the first temperature. of road, in the greenhouse of the air conditioning system comprising a flow path control means to flow air only to the third air flow path, the second The portion of the road and the third flow passage arranged in the greenhouse is composed of a plurality of indoor blow pipes arranged in parallel to the ground, and the lower portion of the indoor blow pipe exhausts the air in the pipe to the greenhouse. A greenhouse air conditioning system, wherein a plurality of holes are formed at predetermined intervals .   2. The greenhouse air conditioning system according to claim 1, wherein when the temperature detected by the temperature sensor is higher than the second temperature and lower than the first temperature, the flow path control unit performs first to third air flows. A greenhouse air conditioning system that is controlled so that no air flows through any of the roads. The greenhouse air conditioning system according to claim 1 or 2, wherein a plurality of the indoor outlet pipes are arranged in a longitudinal direction of the greenhouse.   The greenhouse air conditioning system according to any one of claims 1 to 3, further comprising a water droplet collection container embedded in a position lower than the first underground pipe and connected to the first underground pipe. Greenhouse air conditioning system.

Images