CN213029315U - Greenhouse vegetable temperature and humidity control device - Google Patents
Greenhouse vegetable temperature and humidity control device Download PDFInfo
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- CN213029315U CN213029315U CN202022028851.0U CN202022028851U CN213029315U CN 213029315 U CN213029315 U CN 213029315U CN 202022028851 U CN202022028851 U CN 202022028851U CN 213029315 U CN213029315 U CN 213029315U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
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Abstract
The utility model discloses a greenhouse vegetable temperature and humidity control device, which comprises a greenhouse main body, a controller, a temperature and humidity sensor, a heating and humidifying system and a cooling and dehumidifying system; the heating and humidifying system comprises a humidifying component and a heating component, the humidifying component comprises a water storage tank, a guide rail, a tank chain, an atomizing nozzle and a flexible water distribution pipe, the guide rail is respectively arranged on two inner sides of the greenhouse main body corresponding to the length direction of the greenhouse main body along the length direction of the greenhouse main body, the atomizing nozzle is arranged on a sliding block of the guide rail, the tank chain is arranged below the guide rail in parallel, one end of the tank chain is connected with the sliding block of the guide rail, the flexible water distribution pipe is laid on the tank chain, one end of the flexible water distribution pipe is connected with the atomizing nozzle, and the other; the signal input end of the water pump is connected with the first signal output end of the controller, and the signal input end of the guide rail is connected with the second signal output end of the controller.
Description
Technical Field
The utility model relates to an agricultural planting equipment technical field, especially a greenhouse vegetable temperature and humidity control device.
Background
At present, plastic film greenhouses are mostly adopted for planting vegetables, when the greenhouses are adopted for planting the vegetables, the temperature and the humidity of the environment for growing the vegetables are particularly noticed, if the temperature and the humidity in the greenhouses are not suitable, poor growth of the vegetables can be caused, when illumination is sufficient in daytime, the temperature in the greenhouses is increased, if the greenhouses cannot ventilate and cool in time, the growth of the vegetables is seriously influenced, even the infection and the occurrence of vegetable diseases and insect pests are caused, the temperature and humidity ventilation system of the current vegetable greenhouse cannot be automatically adjusted, the temperature and the humidity and the ventilation need to be manually checked, time and labor are wasted when the greenhouse is used, and errors caused by manual inspection.
SUMMERY OF THE UTILITY MODEL
For solving the problem that exists among the prior art, the utility model provides a greenhouse vegetable temperature and humidity control device.
The utility model adopts the technical proposal that:
a greenhouse vegetable temperature and humidity control device comprises a greenhouse main body, a controller, a temperature and humidity sensor for detecting the temperature and humidity in the greenhouse main body, a heating and humidifying system for improving the temperature and humidity in the greenhouse main body and a cooling and dehumidifying system for reducing the temperature and humidity in the greenhouse;
the heating and humidifying system comprises a humidifying component and a heating component, the humidifying component comprises a water storage tank, a guide rail, a tank chain, an atomizing nozzle and a flexible water distribution pipe, the guide rail is arranged on two inner sides of the greenhouse main body corresponding to the length direction of the greenhouse main body respectively along the length direction of the greenhouse main body, the atomizing nozzle is arranged on a sliding block of the guide rail, the tank chain is arranged below the guide rail in parallel, one end of the tank chain is connected with the sliding block of the guide rail, the flexible water distribution pipe is laid on the tank chain, one end of the flexible water distribution pipe is connected with the atomizing nozzle, and the other end of the flexible water distribution pipe is connected with; the signal input end of the first water pump is connected with the first signal output end of the controller, and the signal input end of the guide rail is connected with the second signal output end of the controller.
Preferably, the heating assembly comprises an air inlet main pipe, air inlet branch pipes and a heater, the two outer sides of the greenhouse main body corresponding to the length direction of the greenhouse main body are respectively provided with the air inlet main pipe along the length direction of the greenhouse main body, the middle part of the air inlet main pipe is connected with a first air delivery pipe, two ends of the air inlet main pipe are respectively divided into two parts step by step and connected with a multi-stage air inlet branch pipe, the lengths of the air transmission paths from the last stage air inlet branch pipe to the first air transmission pipe are equal, the last stage air inlet branch pipe is respectively provided with a heater, the air outlets of the last stage air inlet branch pipe are uniformly distributed at two inner sides of the greenhouse main body corresponding to the length direction of the greenhouse main body, and the gas outlets of the last stage of gas inlet branch pipes are respectively provided with a gas inlet fan, the signal input end of the heater is connected with the third signal output end of the controller, and the signal input end of the gas inlet fan is connected with the fourth signal output end of the controller.
Preferably, the cooling and dehumidifying system comprises an exhaust main pipe, exhaust branch pipes, a cooling and dehumidifying chamber, a condenser, a heat exchanger, a compressor and a safety valve, the two outer sides of the greenhouse main body corresponding to the length direction of the greenhouse main body are respectively provided with the exhaust main pipe along the length direction of the greenhouse main body, the middle part of the exhaust main pipe is connected with the cooling and dehumidifying chamber through a second gas pipe, two ends of the exhaust main pipe are respectively divided into two parts step by step to be connected with multi-stage exhaust branch pipes, the length of a gas transmission path between the last exhaust branch pipe and the second gas pipe is equal, air inlets of the last exhaust branch pipe are uniformly distributed on two inner sides of the greenhouse main body corresponding to the length direction of the greenhouse main body, air inlets of the last exhaust branch pipe are respectively provided with an exhaust fan, an air outlet of the cooling and dehumidifying chamber is connected with the first gas pipe, the condenser is arranged, The heat exchanger and the safety valve are sequentially connected through a refrigerant circulating pipeline, a signal input end of the exhaust fan is connected with a fifth signal output end of the controller, and a signal input end of the compressor is connected with a sixth signal output end of the controller.
Preferably, the bottom of the cooling and dehumidifying chamber is connected with a water collecting tank, the bottom of the water collecting tank is communicated with the top of the water storage tank through a pipeline, and a second water pump is arranged on the pipeline.
Preferably, the top of the water storage tank is further connected with a water supply pipe, the water supply pipe is provided with an electromagnetic valve, the water storage tank is internally provided with a first liquid level sensor, the water collection tank is internally provided with a second liquid level sensor, the signal output end of the first liquid level sensor is connected with the second signal input end of the controller, the signal input end of the electromagnetic valve is connected with the seventh signal output end of the controller, the signal output end of the second liquid level sensor is connected with the third signal input end of the controller, and the signal input end of the second water pump is connected with the eighth signal output end of the controller.
The utility model has the advantages that:
1. the temperature can be raised and humidified, and the temperature can be lowered and dehumidified, so that the temperature and humidity adjustment is more flexible and the practicability is higher;
2. the temperature and the humidity can be synchronously adjusted, and can also be independently adjusted;
3. the atomizing spray head is moved through the guide rail, uniform humidification is realized, and the temperature rise, the temperature reduction and the dehumidification are also more uniform through the uniformly distributed air inlet branch pipes and air outlet branch pipes which are arranged in a progressive manner in a hierarchical manner.
Drawings
Fig. 1 is a schematic front view of an embodiment of the present invention;
fig. 2 is a left side view schematic diagram of the last stage of the air intake branch pipe located on the front surface of the greenhouse main body in the embodiment of the present invention;
fig. 3 is a left side view of the last exhaust branch pipe located on the front surface of the greenhouse main body according to the embodiment of the present invention;
FIG. 4 is an enlarged schematic view of a portion A of FIG. 1;
fig. 5 is a schematic view of a connection structure of a controller according to an embodiment of the present invention;
reference numerals: 1. the greenhouse comprises a greenhouse main body, 2, a controller, 3, a water storage tank, 4, a guide rail, 5, a tank chain, 6, an atomizing spray head, 7, a flexible water distribution pipe, 8, a first water pump, 9, an air inlet main pipe, 10, an air inlet branch pipe, 11, a heater, 12, an air inlet fan, 13, an air outlet main pipe, 14, an air outlet branch pipe, 15, a cooling and dehumidifying chamber, 16, a condenser, 17, a heat exchanger, 18, a compressor, 19, a safety valve, 20, an air outlet fan, 21, a water collecting tank, 22, a second water pump, 23, a temperature and humidity sensor, 24, a water supply pipe, 25, an electromagnetic valve, 26, a first liquid level sensor, 27, a second liquid level sensor, 28, a first air conveying pipe, 29 and a second.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Examples
As shown in fig. 1-5, a greenhouse vegetable temperature and humidity control device comprises a greenhouse main body 1, a controller 2, a temperature and humidity sensor 23 for detecting the temperature and humidity in the greenhouse main body 1, a heating and humidifying system for increasing the temperature and humidity in the greenhouse main body 1, and a cooling and dehumidifying system for reducing the temperature and humidity in the greenhouse;
the heating and humidifying system comprises a humidifying component and a heating component, the humidifying component comprises a water storage tank 3, a guide rail 4, a tank chain 5, an atomizing spray head 6 and a flexible water distribution pipe 7, the guide rail 4 is respectively arranged on two inner sides of the greenhouse main body 1 corresponding to the length direction of the greenhouse main body 1 along the length direction of the greenhouse main body 1, the atomizing spray head 6 is arranged on a slide block of the guide rail 4, the tank chain 5 is arranged below the guide rail 4 in parallel, one end of the tank chain 5 is connected with the slide block of the guide rail 4, the flexible water distribution pipe 7 is laid on the tank chain 5, one end of the flexible water distribution pipe 7 is connected with the atomizing spray head 6, and the other end of the flexible water distribution pipe is; the signal input end of the first water pump 8 is connected with the first signal output end of the controller 2, and the signal input end of the guide rail 4 is connected with the second signal output end of the controller 2.
The temperature and humidity in the greenhouse main body 1 are monitored in real time by the temperature and humidity sensor 23 in the greenhouse main body 1, monitoring signals are sent to the controller 2, and the controller 2 compares the real-time temperature and humidity in the greenhouse main body 1 with preset temperature and humidity to determine whether the temperature and humidity of the greenhouse main body 1 needs to be adjusted.
When needs humidification, start through controller 2 control first water pump 8, from storage water tank 3 internal to flexible water distributor 7 water delivery to spout behind atomizing nozzle 6 with water atomization and carry out the humidification, compare in direct water spray, the humidification effect is better, and the water smoke after the atomizing dwell time in the air is long, and can not directly drop in ground. Control guide rail 4 by controller 2 and drive slider reciprocating motion, realize the even humidification in the big-arch shelter main part 1, tank chain 5 can ensure at the slider removal in-process, flexible water distributor 7 is by fine accomodating all the time, the winding condition can not take place, and because at the slider removal in-process, the flow path of water is unanimous between atomizer 6 and the water pump, the water pressure of atomizer 6 department is stable undulant little, no matter atomizer 6 is located where, spun water smoke distance also can keep unanimous, the homogeneity of humidification has been guaranteed.
The heating component comprises an air inlet main pipe 9, air inlet branch pipes 10 and a heater 11, the two outer sides of the greenhouse main body 1 corresponding to the length direction of the greenhouse main body are respectively provided with the air inlet main pipe 9 along the length direction of the greenhouse main body 1, the middle part of the air inlet main pipe 9 is connected with a first air delivery pipe 28, two ends of the air inlet main pipe 9 are respectively divided into two by stages and connected with a multi-stage air inlet branch pipe 10, the lengths of the gas transmission paths between the last stage gas inlet branch pipe 10 and the first gas transmission pipe 28 are equal, the last stage gas inlet branch pipe 10 is respectively provided with a heater 11, the gas outlets of the last stage gas inlet branch pipe 10 are uniformly distributed at two inner sides of the greenhouse main body 1 corresponding to the length direction thereof, and the air outlet of the last stage of air inlet branch pipe 10 is respectively provided with an air inlet fan 12, the signal input end of the heater 11 is connected with the third signal output end of the controller 2, and the signal input end of the air inlet fan 12 is connected with the fourth signal output end of the controller 2.
When the temperature needs to be raised, the controller 2 starts the air inlet fan 12 and the heater 11, air is conveyed to the air inlet main pipe 9 through the first air conveying pipe 28, the air flows into the last stage air inlet branch pipe 10 through the multi-stage air inlet branch pipes 10, and the air in the last stage air inlet branch pipe 10 is heated by the heater 11 and then is blown into the greenhouse main body 1 through the air inlet fan 12 to be raised in temperature.
Through the inlet branch pipe 10 that the level set up, realize the even inlet and heat up, wherein the quantity of first order inlet branch pipe 10 is 2, the quantity of Nth level inlet branch pipe 10 is 2N, analogize in proper order, inlet branch pipe 10 of each grade is two double-tenth a set ofly from the left side to the right side of big-arch shelter main part 1 in proper order, every group inlet branch pipe 10 corresponds with one of them inlet branch pipe 10 or the inlet manifold 9 of last level respectively, every group inlet branch pipe 10 is connected with the both ends of the inlet branch pipe 10 or the inlet manifold 9 that last level corresponds respectively, as shown in figure 1, last inlet branch pipe 10 quantity of last stage can be eight, the gas outlet through eight last stage equipartitions of inlet branch pipe 10 of the top in big-arch shelter main part 1, it is more even to make the.
The temperature-reducing dehumidifying system comprises an exhaust main pipe 13, exhaust branch pipes 14, a temperature-reducing dehumidifying chamber 15, a condenser 16, a heat exchanger 17, a compressor 18 and a safety valve 19, the exhaust main pipe 13 is respectively arranged on two outer sides of the greenhouse main body 1 corresponding to the length direction of the greenhouse main body, the middle part of the exhaust main pipe 13 is connected with the temperature-reducing dehumidifying chamber 15 through a second gas pipe 29, two ends of the exhaust main pipe 13 are respectively divided into two stages and connected with the multistage exhaust branch pipes 14, the lengths of gas transmission paths from the last stage exhaust branch pipe 14 to the second gas pipe 29 are equal, the gas inlets of the last stage exhaust branch pipe 14 are uniformly distributed on two inner sides of the greenhouse main body 1 corresponding to the length direction of the greenhouse main body, the gas inlets of the last stage exhaust branch pipe 14 are respectively provided with an exhaust fan 20, the gas outlet of the temperature-reducing dehumidifying chamber 15 is connected with a first gas pipe 28, the condenser 16 is arranged in the temperature-, the condenser 16, the compressor 18, the heat exchanger 17 and the safety valve 19 are connected in sequence through a refrigerant circulation pipeline, a signal input end of the exhaust fan 20 is connected with a fifth signal output end of the controller 2, and a signal input end of the compressor 18 is connected with a sixth signal output end of the controller 2.
When dehumidification is needed, the controller 2 starts the exhaust fan 20, the compressor 18 and the intake fan 12, and the exhaust fan 20 on each final exhaust branch pipe 14 uniformly conveys the air in the greenhouse main body 1 to the upper exhaust branch pipe 14, the exhaust manifold 13 and the second air conveying pipe 29. The compressor 18 compresses the refrigerant gas in the refrigerant circulation pipeline to increase the pressure and temperature of the refrigerant, after the high-temperature refrigerant flows through the heat exchanger, the heat is taken away by the gas in the heat exchanger 17, the refrigerant is then cooled and liquefied, when the high-pressure liquid refrigerant flows through the safety valve 19, the high-pressure region flows to the low-pressure region, so that the liquid refrigerant rapidly expands and evaporates, and flows through the condenser 16 to absorb the heat in the high-temperature high-humidity gas input into the temperature-reducing and dehumidifying chamber 15 through the second gas pipe 29 in the evaporation process, thereby reducing the temperature of the high-temperature high-humidity gas and condensing the water vapor in the high-temperature high-humidity gas, and finally the low-temperature low-humidity gas from the temperature-reducing and dehumidifying chamber 15 is sent back into the greenhouse main body 1 through the first gas pipe 28, the. When only dehumidification is needed in the greenhouse main body 1, the heater 11 can be started through the controller 2, and the low-temperature and low-humidity gas input by the last-stage gas inlet branch pipe 10 is heated and then sent into the greenhouse main body 1.
The bottom of cooling dehumidification room 15 is connected with water collection tank 21, the bottom of water collection tank 21 passes through the top intercommunication of pipeline and storage water tank 3, and is equipped with second water pump 22 on this pipeline.
The water collecting tank 21 can collect water condensed from water vapor in the high-temperature and high-humidity gas in the temperature-reducing and dehumidifying chamber 15, and can be conveyed to the water storage tank 3 by the second water pump 22 for humidification.
The top of storage water tank 3 still is connected with delivery pipe 24, be equipped with solenoid valve 25 on the delivery pipe 24, be equipped with first level sensor 26 in the storage water tank 3, be equipped with second level sensor 27 in the header tank 21, the second signal input part of first level sensor 26's signal output part connection director 2, the seventh signal output part of solenoid valve 25's signal input part connection director 2, the third signal input part of second level sensor 27's signal output part connection director 2, the eighth signal output part of second water pump 22's signal input part connection director 2.
In order to avoid the situation that the water quantity in the water storage tank 3 is insufficient, a first liquid level sensor 26 is installed in the water storage tank 3, the water level in the water storage tank 3 is detected through the first liquid level sensor 26, when the water level is lower than the lowest water level of the preset water storage tank 3, the controller 2 starts the electromagnetic valve 25 to inject water into the water storage tank 3 through the water supply pipe 24, and when the water level is higher than the highest water level of the preset water storage tank 3, the controller 2 closes the electromagnetic valve 25 to stop injecting water. The second level sensor 27 is used for detecting the water level in the water collecting tank 21, when the water level is lower than the preset highest water level of the water collecting tank 21, the controller 2 starts the second water pump 22 to deliver the water in the water collecting tank 21 to the water storage tank 3, and when the water level is lower than the preset lowest water level of the water collecting tank 21, the controller 2 closes the second water pump 22 to stop delivering the water.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (5)
1. The greenhouse vegetable temperature and humidity control device is characterized by comprising a greenhouse main body (1), a controller (2), a temperature and humidity sensor (23) for detecting the temperature and humidity in the greenhouse main body (1), a heating and humidifying system for improving the temperature and humidity in the greenhouse main body (1) and a cooling and dehumidifying system for reducing the temperature and humidity in the greenhouse;
the heating and humidifying system comprises a humidifying component and a heating component, the humidifying component comprises a water storage tank (3), a guide rail (4), a tank chain (5), an atomizing spray head (6) and a flexible water distribution pipe (7), the guide rail (4) is arranged on two inner sides of the greenhouse main body (1) corresponding to the length direction of the greenhouse main body respectively along the length direction of the greenhouse main body (1), the atomizing spray head (6) is arranged on a sliding block of the guide rail (4), the tank chain (5) is arranged below the guide rail (4) in parallel, one end of the tank chain (5) is connected with the sliding block of the guide rail (4), the flexible water distribution pipe (7) is laid on the tank chain (5), one end of the flexible water distribution pipe (7) is connected with the atomizing spray head (6), and the other end of the flexible water distribution pipe is connected with the water storage tank (; the signal input end of the first water pump (8) is connected with the first signal output end of the controller (2), the signal input end of the guide rail (4) is connected with the second signal output end of the controller (2), and the signal output end of the temperature and humidity sensor (23) is connected with the first signal input end of the controller.
2. The greenhouse vegetable temperature and humidity control device according to claim 1, wherein the heating assembly comprises an air inlet header pipe (9), air inlet branch pipes (10) and heaters (11), the two outer sides of the greenhouse main body (1) corresponding to the length direction of the greenhouse main body are respectively provided with the air inlet header pipe (9) along the length direction of the greenhouse main body (1), the middle part of the air inlet header pipe (9) is connected with a first air pipe (28), two ends of the air inlet header pipe (9) are respectively divided into two stages step by step to be connected with the multistage air inlet branch pipes (10), the lengths of air transmission paths between the last stage air inlet branch pipe (10) and the first air pipe (28) are equal, the heaters (11) are respectively arranged on the last stage air inlet branch pipe (10), and air outlets of the last stage air inlet branch pipe (10) are uniformly distributed on the two inner sides of the greenhouse main body (1) corresponding to the length direction of the greenhouse, and the air outlets of the last stage of air inlet branch pipes (10) are respectively provided with an air inlet fan (12), the signal input end of the heater (11) is connected with the third signal output end of the controller (2), and the signal input end of the air inlet fan (12) is connected with the fourth signal output end of the controller (2).
3. The greenhouse vegetable temperature and humidity control device according to claim 2, wherein the temperature reduction and dehumidification system comprises an exhaust main pipe (13), exhaust branch pipes (14), a temperature reduction and dehumidification chamber (15), a condenser (16), a heat exchanger (17), a compressor (18) and a safety valve (19), the exhaust main pipe (13) is arranged on two outer sides of the greenhouse main body (1) corresponding to the length direction of the greenhouse main body respectively along the length direction of the greenhouse main body (1), the middle part of the exhaust main pipe (13) is connected with the temperature reduction and dehumidification chamber (15) through a second air pipe (29), two ends of the exhaust main pipe (13) are respectively divided into two stages by stages to be connected with the multistage exhaust branch pipes (14), the lengths of air transmission paths between the last stage exhaust branch pipe (14) and the second air pipe (29) are equal, and air inlets of the last stage exhaust branch pipe (14) are uniformly distributed on two inner sides of the greenhouse main body (1) corresponding to the length direction of the greenhouse main, and the air inlets of the last exhaust branch pipes (14) are respectively provided with an exhaust fan (20), the air outlets of the cooling and dehumidifying chambers (15) are connected with a first air conveying pipe (28), the condenser (16) is arranged in the cooling and dehumidifying chambers (15), the condenser (16), the compressor (18), the heat exchanger (17) and the safety valve (19) are sequentially connected through a refrigerant circulating pipeline, the signal input end of the exhaust fan (20) is connected with the fifth signal output end of the controller (2), and the signal input end of the compressor (18) is connected with the sixth signal output end of the controller (2).
4. The greenhouse vegetable temperature and humidity control device as claimed in claim 3, wherein a water collecting tank (21) is connected to the bottom of the temperature and humidity reducing chamber (15), the bottom of the water collecting tank (21) is communicated with the top of the water storage tank (3) through a pipeline, and a second water pump (22) is arranged on the pipeline.
5. The greenhouse vegetable temperature and humidity control device according to claim 4, wherein a water supply pipe (24) is further connected to the top of the water storage tank, an electromagnetic valve (25) is arranged on the water supply pipe (24), a first liquid level sensor (26) is arranged in the water storage tank, a second liquid level sensor (27) is arranged in the water collection tank, a signal output end of the first liquid level sensor (26) is connected with a second signal input end of the controller (2), a signal input end of the electromagnetic valve (25) is connected with a seventh signal output end of the controller (2), a signal output end of the second liquid level sensor (27) is connected with a third signal input end of the controller (2), and a signal input end of the second water pump is connected with an eighth signal output end of the controller (2).
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| CN202022028851.0U CN213029315U (en) | 2020-09-16 | 2020-09-16 | Greenhouse vegetable temperature and humidity control device |
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| CN202022028851.0U CN213029315U (en) | 2020-09-16 | 2020-09-16 | Greenhouse vegetable temperature and humidity control device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113317088A (en) * | 2021-07-14 | 2021-08-31 | 上海电机学院 | Temperature and humidity adjusting system for greenhouse in arid and semi-arid regions |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113317088A (en) * | 2021-07-14 | 2021-08-31 | 上海电机学院 | Temperature and humidity adjusting system for greenhouse in arid and semi-arid regions |
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