Integrated microchannel dehumidification system

Abstract

The application discloses an integrated micro-channel dehumidification system, and mainly relates to the field of greenhouse dehumidification. The integrated micro-channel dehumidification system comprises a variable frequency fan, an air duct, a heat exchanger, an air humidity sensor, a condensate water collecting tank, a nutrient machine and a control cabinet. The variable frequency fan, the heat exchanger and the air humidity sensor are sequentially fixed in the air duct. The heat exchanger is internally provided with a closed loop, and the heat exchanger is connected with a constant-temperature water tank through an insulation pipeline. The heat exchanger is connected with the condensate water collecting tank through a pipeline. The condensate water collecting tank is connected with the nutrient machine through a pipeline, and a flow passage switch is connected on the pipeline. The flow passage switch, the variable frequency fan and the air humidity sensor are connected with the control cabinet through an electric circuit. The integrated micro-channel dehumidification system can accurately control the temperature and humidity of air in a greenhouse, adapt to the growth environment requirements of different crops, simultaneously complete effective utilization of water resources and nutrient supply, optimize the growth conditions of crops, and improve the resource utilization efficiency.

Description

Technical Field

[0001] This invention relates to the field of greenhouse dehumidification, specifically an integrated microchannel dehumidification system. Background Technology

[0002] Greenhouses, as an important form of modern facility agriculture, play a significant role in improving agricultural production efficiency and ensuring the supply of agricultural products. The relatively closed system within a greenhouse prevents the natural dissipation of moisture generated from plant transpiration, soil evaporation, and irrigation, resulting in significantly higher internal humidity than the outside. In winter, relative humidity often exceeds 80%. Ventilation during cold seasons significantly lowers the temperature, and rain or snow prevents opening windows, further exacerbating moisture accumulation. High humidity environments (humidity > 85%) easily induce fungal diseases such as gray mold and downy mildew, leading to reduced yields or even crop failure. Simultaneously, they hinder plant transpiration, affecting water and nutrient transport and inducing flower and fruit drop.

[0003] Existing greenhouse dehumidification devices are inefficient and do not recycle the condensate after dehumidification, which does not meet the current concept of building new energy "green" greenhouses. In the cold winters of the north, if there is a prolonged period of low temperatures, the greenhouse will remain in a high-humidity environment for a long time after irrigation, making it difficult to ensure that the humidity inside the greenhouse reaches the optimal humidity for plant growth. In greenhouses in northern regions, ventilation is generally used to maintain indoor humidity in summer, but it is difficult to meet the optimal growth conditions for plants. In the greenhouse environment, due to the high indoor humidity, the dehumidifiers used in greenhouses have problems such as poor dehumidification efficiency, long dehumidification time, and waste of dehumidified condensate. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated microchannel dehumidification system that can accurately regulate the temperature and humidity of the air in a greenhouse, adapt to the growth environment requirements of different types of crops, simultaneously achieve effective water resource utilization and nutrient supply, optimize crop growth conditions, and improve resource utilization efficiency.

[0005] To achieve the above objectives, the present invention employs the following technical solution: The integrated microchannel dehumidification system includes a variable frequency fan, air duct, heat exchanger, air humidity sensor, condensate collection tank, nutrient generator, and control cabinet; The variable frequency fan, heat exchanger, and air humidity sensor are sequentially fixed in the air duct; The heat exchanger is equipped with a closed loop, and the heat exchanger is connected in series with a constant temperature water tank through an insulated pipe. The heat exchanger is connected to the condensate collection tank via a pipe; The condensate collection tank is connected to the nutrient machine via a pipe, and a flow switch is connected to the pipe. The flow channel switch, variable frequency fan, and air humidity sensor are all connected to the control cabinet via circuitry.

[0006] Furthermore, the system also includes a solar photovoltaic panel and a battery electrically connected to the solar photovoltaic panel, the solar photovoltaic panel being electrically connected to the control cabinet.

[0007] Furthermore, the variable frequency fan is electrically connected to a fan controller, and the fan controller is also electrically connected to the control cabinet.

[0008] Furthermore, a flow meter, a circulating pump, and a throttling valve are also connected in series in the series pipeline between the heat exchanger and the constant temperature water bath, with the throttling valve connected separately in series on one side of the constant temperature water bath.

[0009] Furthermore, the condensate collection tank is equipped with a pressure valve.

[0010] Furthermore, the heat exchanger is 200mm long and includes 59 heat exchange plates, each plate having 48 microchannels, and each microchannel has a cross-sectional dimension of 0.8mm × 1mm.

[0011] Furthermore, the constant temperature water bath pre-cools the refrigerant to 3°C.

[0012] Furthermore, a water level monitoring device is installed inside the condensate collection tank.

[0013] Furthermore, a soil moisture sensor electrically connected to the control cabinet is installed inside the greenhouse soil.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention employs a microchannel heat exchanger to dehumidify the air inside the greenhouse, significantly improving dehumidification efficiency; it achieves intelligent management of water and nutrients through a control cabinet, enhancing automation and intelligence while reducing water waste; it utilizes a combination of solar photovoltaic panels and batteries for power supply, saving energy; the heat exchanger not only improves dehumidification but also recovers and utilizes condensate for precision irrigation, resulting in significant energy and water savings; combined with nutrient solution injection, it improves crop growth conditions and alleviates the damage to crops caused by high humidity in the greenhouse. Attached Figure Description

[0015] Appendix Figure 1 This is a schematic diagram of the structure of the present invention.

[0016] The following are the labels in the attached diagram: 1. Variable frequency fan; 2. Air duct; 3. Heat exchanger; 4. Flow meter; 5. Circulating pump; 6. Constant temperature water bath; 7. Throttling valve; 8. Pressure valve; 9. Condensate collection tank; 10. Control cabinet; 11. Flow channel switch; 12. Air humidity sensor; 13. Fan controller; 14. Soil moisture sensor; 15. Nutrient generator; 16. Solar photovoltaic panel; 17. Battery. Detailed Implementation

[0017] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined in this application.

[0018] The present invention describes an integrated microchannel dehumidification system, the main structure of which includes a variable frequency fan 1, an air duct 2, a heat exchanger 3, an air humidity sensor 12, a condensate collection tank 9, a nutrient machine 15, and a control cabinet 10. The variable frequency fan 1, heat exchanger 3, and air humidity sensor 12 are sequentially fixed in the air duct 2; The heat exchanger 3 is equipped with a closed loop in which refrigerant R32 circulates. The heat exchanger 3 is connected in series with a flow meter 4, a circulating pump 5, a constant temperature water tank 6 and a throttle valve 7 through an insulated pipe. The throttle valve 7 is connected in series on one side of the constant temperature water tank 6. The heat exchanger 3 is connected to the condensate collection tank 9 via a pipe; The condensate collection tank 9 is connected to the nutrient machine 15 by a pipe, and a flow switch 11 is connected to the pipe. The condensate collection tank 9 is equipped with a water level monitoring device to detect changes in the water level inside the tank.

[0019] The flow channel switch 11, the variable frequency fan 1, and the air humidity sensor 12 are all connected to the control cabinet 10 via circuits. A soil humidity sensor 14, which is electrically connected to the control cabinet 10, is also installed in the greenhouse soil. The system is equipped with the control cabinet 10, which receives signals from the variable frequency fan 1, the humidity sensor, and the water level monitoring device in the condensate collection tank 9, and adjusts the fan speed and the flow channel switch 11.

[0020] The control cabinet 10 is set to maintain a long-term soil moisture level of around 70%. When the soil moisture sensor 14 detects that the soil moisture is too low, such as 50%, the control cabinet 10 will control the valve to irrigate the crops. When the soil moisture sensor 14 detects that the soil moisture is too high, consistently above 95%, the control cabinet 10 will increase the fan speed to improve dehumidification efficiency. The use of the nutrient machine 15 requires the growers to dynamically adjust the nutrients based on their observation of the crop conditions.

[0021] Preferably, the system further includes a solar photovoltaic panel 16 and a battery 17 electrically connected to the solar photovoltaic panel 16. The solar photovoltaic panel 16 is electrically connected to the control cabinet 10. The power consumption of the system is provided by the solar photovoltaic panel during the day, and the battery pack stores the excess power generated by the solar photovoltaic device to provide power at night.

[0022] Preferably, the variable frequency fan 1 is electrically connected to a fan controller 13, and the fan controller 13 is also electrically connected to the control cabinet 10.

[0023] Preferably, the condensate collection tank 9 is equipped with a pressure valve 8.

[0024] Preferably, the heat exchanger 3 is 200mm long and includes 59 heat exchange plates, each plate having 48 microchannels, and each microchannel has a cross-sectional dimension of 0.8mm×1mm.

[0025] Preferably, the constant temperature water bath 6 pre-cools the refrigerant to 3°C.

[0026] The working process of the system of this invention is as follows: (1) Dehumidification process: The variable frequency fan 1 sends the high humidity air in the greenhouse into the air duct 2, and the air flows through the heat exchanger 3. The circulating pump 5 sends the refrigerant R32 into the constant temperature water bath 6 to pre-cool it to 3°C, and then enters the heat exchanger 3 after the pressure is reduced by the throttling valve 7. The low temperature refrigerant exchanges heat with the humid air efficiently, and the air temperature drops below the dew point. The water vapor condenses into condensate, and the dry air is sent back to the greenhouse through the air outlet.

[0027] (2) Condensate collection and utilization: Condensate flows into the condensate collection tank 9 through a pipe. The collection tank is a sealed structure, with a pressure valve 8 installed on the top or side to balance the air pressure inside and outside the tank, prevent damage from negative pressure, and reduce secondary evaporation of water. When the water level monitoring device detects that the water level has reached more than 80% of the total capacity and the soil moisture sensor 14 detects that the soil moisture is lower than the preset threshold, the control cabinet 10 opens the flow channel switch 11 to prioritize the use of condensate for drip irrigation. When the water level drops below 5%, the control cabinet 10 cuts off the water supply to prevent dry running.

[0028] (3) Nutrient supplementation: During irrigation, the nutrient solution in the nutrient machine 15 can be mixed with the condensate according to the needs of the crop to form a nutrient solution containing trace elements, thereby realizing the integration of water and fertilizer.

[0029] (4) Dynamic control: The control cabinet 10 automatically adjusts the speed of the variable frequency fan 1 based on the data fed back by the air humidity sensor 12. For example, when the temperature and humidity are high at noon, the fan speed is adjusted to 4 m / s; at night or when the humidity is low, the speed is adjusted to 0.3-0.5 m / s to maintain suitable humidity and save energy.

[0030] (5) Power supply method: During the day, the solar photovoltaic panel 16 supplies power and charges the storage battery 17. At night, the storage battery 17 supplies power, realizing the utilization of clean energy.

[0031] System operating conditions Power supply conditions: Rated voltage AC 380V, allowable fluctuation ±10%, frequency 50Hz.

[0032] Control logic operating conditions: Real-time acquisition of humidity signals inside the greenhouse; automatic dehumidification starts when humidity is above 80%RH and stops when humidity is below 60%RH.

[0033] Protection conditions: It has overload, short circuit, phase loss, compressor delayed start (3 minutes) and sensor fault alarm functions.

[0034] Continuous operation: Under rated electrical parameters and environmental conditions, the control cabinet supports 24-hour uninterrupted operation.

Claims

1. An integrated microchannel dehumidification system, characterized in that: Includes variable frequency fan (1), air duct (2), heat exchanger (3), air humidity sensor (12), condensate collection tank (9), nutrient machine (15), and control cabinet (10); The variable frequency fan (1), heat exchanger (3), and air humidity sensor (12) are sequentially fixed in the air duct (2); The heat exchanger (3) is equipped with a closed loop, and the heat exchanger (3) is connected in series with a constant temperature water tank (6) through an insulated pipe. The heat exchanger (3) is connected to the condensate collection tank (9) via a pipe; The condensate collection tank (9) is connected to the nutrient machine (15) by a pipe, and a flow channel switch (11) is connected to the pipe. The flow channel switch (11), the variable frequency fan (1), and the air humidity sensor (12) are all connected to the control cabinet (10) via circuits.

2. The integrated microchannel dehumidification system according to claim 1, characterized in that: The system also includes a solar photovoltaic panel (16) and a battery (17) electrically connected to the solar photovoltaic panel (16), the solar photovoltaic panel (16) being electrically connected to the control cabinet (10).

3. The integrated microchannel dehumidification system according to claim 1, characterized in that: The variable frequency fan (1) is electrically connected to a fan controller (13), and the fan controller (13) is also electrically connected to the control cabinet (10).

4. The integrated microchannel dehumidification system according to claim 1, characterized in that: The heat exchanger (3) and the constant temperature water bath (6) are connected in series with a flow meter (4), a circulating pump (5) and a throttle valve (7), and the throttle valve (7) is connected in series on one side of the constant temperature water bath (6).

5. The integrated microchannel dehumidification system according to claim 1, characterized in that: The condensate collection tank (9) is equipped with a pressure valve (8).

6. The integrated microchannel dehumidification system according to claim 1, characterized in that: The heat exchanger (3) is 200mm long and includes 59 heat exchange plates, each of which has 48 microchannels with a cross-sectional size of 0.8mm×1mm.

7. The integrated microchannel dehumidification system according to claim 1, characterized in that: The constant temperature water bath (6) pre-cools the refrigerant to 3°C.

8. The integrated microchannel dehumidification system according to claim 1, characterized in that: The condensate collection tank (9) is equipped with a water level monitoring device.

9. The integrated microchannel dehumidification system according to claim 1, characterized in that: A soil moisture sensor (14) electrically connected to the control cabinet (10) is installed in the greenhouse soil.

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