Underground pipe dehumidification system for sunlight greenhouse

Abstract

The utility model relates to the field of indoor air dehumidification of sunlight greenhouses, and discloses a buried pipe dehumidification system for sunlight greenhouses, which comprises a buried pipe transversely arranged underground, the buried pipe is obliquely arranged from the upper left to the lower right, the left end of the buried pipe is communicated with an air inlet pipe, the right end of the buried pipe is communicated with an air outlet pipe, and the air outlet pipe is communicated with an air outlet pipe. The upper end of the air inlet pipe and the upper end of the air outlet pipe are both located above the ground, a fan system is arranged at the upper end of the air outlet pipe, a heat exchange system is arranged in the upper end of the air inlet pipe, and a drainage pipe is arranged below the right end of the buried pipe. According to the principle that hot and humid air is condensed when encountering a low-temperature pipe wall, the dew-point temperature of the hot and humid air is far higher than the soil temperature at the moment by increasing the temperature of the air, so that the air is condensed on the inner wall of the buried pipe to discharge water, and the purpose of reducing the air humidity is achieved; therefore, the purpose of reducing the overall humidity of air in the greenhouse is achieved.

Description

Technical Field

[0001] The utility model relates to the field of indoor air dehumidification in a solar greenhouse, in particular to a ground-buried pipe dehumidification control system for a solar greenhouse, which achieves the purpose of dehumidification by condensing indoor air in a ground-buried pipe. Background Art

[0002] As a unique agricultural facility in my country, the solar greenhouse has effectively solved the problem of difficult fruit and vegetable supply in the northern region for thousands of years, and has made it possible to supply fruits and vegetables all year round. It has great social significance and economic value, especially for improving the diversity of winter vegetables and increasing agricultural production and income. As a closed agricultural environment system, the light, temperature, and humidity environment inside the greenhouse is called a microclimate. In this microclimate, solar radiation, carbon dioxide concentration, temperature, and relative humidity are interdependent and interact with each other, jointly affecting the growth and development of crops, thereby affecting the yield and quality of crops.

[0003] Based on existing research and field investigation, the inventor found that the relative humidity in the solar greenhouse is very high, especially at night, when the air temperature decreases, the corresponding saturated humidity decreases, and the relative humidity in the solar greenhouse will be higher. In a high humidity environment, the respiration of crops will be enhanced, consuming more energy and nutrients, resulting in slow growth of crops and reduced yields. At the same time, photosynthesis is hindered, and excessive humidity will cause excessive moisture on the leaves, affecting the gas exchange of the leaves, resulting in reduced photosynthesis efficiency. Specifically, excessive humidity will close the stomata, and carbon dioxide cannot enter the mesophyll cells, thereby affecting photosynthesis. When the humidity is too high, it will condense into dew on the inner surface of the greenhouse film, which will not only reduce the amount of solar radiation passing through the greenhouse film, but also the dew condensed in the greenhouse film will fall on the crops, which will further affect the photosynthesis of the crops. At the same time, a high humidity environment is an ideal growth condition for many bacterial and fungal diseases. These diseases will harm the leaves, stems and fruits of crops, affecting the growth and yield of crops. Based on the above-mentioned adverse effects of excessive humidity on crops in the solar greenhouse, it is necessary to take effective measures to reduce the relative humidity in the solar greenhouse to a reasonable range.

[0004] At present, the commonly used dehumidification methods in solar greenhouses are exchanging with the outside air and using a dehumidifier. Exchanging with the outside dry air can achieve the purpose of dehumidification, but there is a temperature difference between the indoor and outdoor air. The outdoor air needs to be heated before entering the room, otherwise it will affect the indoor temperature. The high temperature gas is directly discharged to the outside, which is not in line with the concept of environmental protection. The use of dehumidifiers has many problems such as inconvenience in use and maintenance, including high maintenance costs and high noise, which has a great impact on users and the surrounding environment, especially in a closed environment such as a solar greenhouse, which further aggravates the harm of noise. The above two traditional dehumidification methods directly discharge the condensed water or water vapor obtained by dehumidification, which is not in line with the environmental protection concept of water saving. Utility Model Content

[0005] In view of the defects and shortcomings of the prior art, the utility model provides a control system for reducing the indoor humidity of a solar greenhouse to a reasonable range. The system uses the principle that hot and humid air condenses on the low-temperature pipe wall, and by increasing the temperature of the air, the dew point temperature is much higher than the soil temperature at that time, so that the air condenses on the inner wall of the buried pipe to reduce the air humidity. By continuously replacing the air in the solar greenhouse, the overall humidity of the air in the greenhouse is reduced.

[0006] A sunlit greenhouse buried pipe dehumidification system comprises a buried pipe horizontally arranged underground, the buried pipe being inclined from the upper left to the lower right, the left end of the buried pipe being connected to an air inlet pipe, the right end of the buried pipe being connected to an air outlet pipe, the upper ends of the air inlet pipe and the air outlet pipe being both located above the ground, the upper end of the air outlet pipe being provided with a fan system, and a drainage pipe being provided below the right end of the buried pipe.

[0007] Preferably, a surface temperature sensor is provided in the buried pipe.

[0008] Preferably, a humidity sensor is provided in the air outlet pipe.

[0009] Preferably, the humidity sensor is located below the fan.

[0010] Preferably, a temperature and humidity sensor is provided in the solar greenhouse.

[0011] Preferably, a heat exchange system is provided at the air intake pipe.

[0012] Preferably, the heat exchange system is an air-water heat exchange system, and the air-water heat exchange system is connected to a heat storage tank through a supply and return water pipe.

[0013] Preferably, the heat exchange system is a resistance wire heat exchange system.

[0014] Preferably, the solar greenhouse buried pipe dehumidification system also includes a controller, and the controller is in communication with the fan system, the surface temperature sensor, the humidity sensor and the temperature and humidity sensor.

[0015] When using the above system for dehumidification, first record the indoor humidity measured by the temperature and humidity sensor. When it is found that the indoor humidity exceeds the fixed humidity range, record the indoor temperature and humidity measured by the temperature and humidity sensor at this time, and calculate the indoor dew point temperature at this time. t d Read the inner wall temperature of the buried pipe measured by the surface temperature sensor at this time t , compared with the dew point. t dMuch greater than the temperature of the inner wall of the buried pipe at this time t , turn on the fan system. Indoor air is constantly condensed in the buried pipe to achieve the purpose of dehumidification. Continuously record the indoor humidity measured by the temperature and humidity sensor. When the air humidity reaches the appropriate humidity range and is stable, turn off the fan system. When the dew point temperature t d The temperature of the inner wall of the buried pipe at this time t The difference is not big, even lower than the temperature of buried pipe t When the indoor air passes through the heat exchanger, the temperature is raised to a point where the dew point is much higher than the inner wall temperature of the buried pipe. t The high-humidity and high-heat air passing through the heat exchange system is continuously condensed in the buried pipe to achieve the purpose of dehumidification. The indoor humidity measured by the temperature and humidity sensor is continuously recorded. When the air humidity reaches the appropriate humidity range and is stable, the fan system and the heat exchange system are turned off. The indoor humidity measured by the temperature and humidity sensor is recorded after a fixed interval. When the indoor humidity is found to exceed the fixed humidity range, the above operation is repeated.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] (1) Good dehumidification effect

[0018] This system uses the temperature of the soil itself and the principle of condensation to make the high-temperature air directly condense water in the condensation pipe and discharge the condensed water. Through circulation, it can effectively reduce the indoor air humidity.

[0019] (2) Energy saving, water saving, low price

[0020] Compared with other dehumidification devices, this system achieves the purpose of dehumidification by controlling the start and stop of the fan system and the heat exchange system. Since it is an indoor circulation, there will be no replacement with outdoor air. All the input energy of the system is used to adjust the indoor heat and humidity environment, so it is more energy-saving. At the same time, the condensed water obtained by dehumidification directly enters the soil, which achieves the purpose of water saving. Moreover, due to the simple structure and easy maintenance of the system, the use and maintenance price is low, which is more suitable for agricultural promotion.

[0021] (3) Simple structure, easy installation, maintenance and use

[0022] The system consists only of temperature and humidity sensors, surface temperature sensors, buried pipes, fan systems and heat exchanger systems. It is easy to install and maintain, and can be adjusted and optimized according to the specific needs and conditions of different solar greenhouses.

[0023] (4) Low noise during operation

[0024] Traditional dehumidifiers make a lot of noise when in operation, but this system does not make a lot of noise when in operation. In the closed environment of a solar greenhouse, it will not cause much trouble to users and the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 Schematic diagram of solar greenhouse dehumidification system scheme 1

[0027] Figure 2 Schematic diagram of solar greenhouse dehumidification system scheme 2

[0028] In the figure, 1-temperature and humidity sensor 2-surface temperature sensor 3-humidity sensor 4-fan system 5-buried pipe 6-drain pipe 7-air-water heat exchange system 8-supply and return water pipe 9-heat water storage tank 10-resistance wire heat exchange system. DETAILED DESCRIPTION

[0029] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0030] Since the temperature difference between day and night in the solar greenhouse is large, while the soil temperature does not change much during the day and night, the system is divided into two different dehumidification modes: day and night. The operation modes of the two dehumidification modes will be introduced below.

[0031] During the day, the air temperature in the solar greenhouse is high, and the dew point temperature of the air is also high, and is higher than the soil temperature at this time. When the temperature and humidity sensor 1 measures that the indoor humidity exceeds the set value, the fan system 4 in the dehumidification system starts. The fan sends the air in the buried pipe 5 into the room. At the same time, due to the effect of atmospheric pressure, the indoor air enters from the other side of the buried pipe 5. Since the indoor air temperature is high, its dew point temperature is also higher than the soil temperature, causing the high-temperature air to cool and condense into water on the inner surface of the buried pipe. The buried pipe is set with a certain slope, so that the condensed water flows along the pipe wall to the drain pipe 6 on the right side, and finally discharged into the soil. The fan system 4 continues to operate, and the atmospheric pressure drives the air to flow continuously. This process ensures that the indoor air is significantly reduced in humidity after being processed by the buried pipe. The condensed water is discharged into the drain pipe, and the air entering the room through the fan has a lower humidity, which effectively adjusts the humidity level in the solar greenhouse and makes the humidity in the solar greenhouse reach a reasonable level.

[0032] At night, the air temperature in the solar greenhouse is lower and the relative humidity is higher. Therefore, dehumidification is more important in the solar greenhouse at night than during the day. At the same time, the dew point temperature of the air is also lower, even lower than the temperature of the soil, so energy needs to be invested to dehumidify and heat up. In order to cause the air to condense on the inner wall of the buried pipe, thereby reducing the indoor humidity, it is necessary to increase the temperature of the air entering the buried pipe so that its dew point temperature is higher than the temperature of the soil. In order to achieve this purpose, the utility model is provided with a heat exchange system at the air inlet of the buried pipe.

[0033] The dehumidification system is designed with two different heat exchange systems, and users can choose according to local weather conditions and electricity consumption.

[0034] like Figure 1 The scheme 1 shown is an air-water heat exchange system 7. The air temperature is increased by exchanging heat with the air through the supply and return water pipes 8. The supply and return water pipes are connected to a heat storage tank 9 to provide heat for the water system. The heat storage tank is connected to a solar water heater and an air source heat pump. When the weather is sunny during the day, the solar water heater works to convert solar energy into heat energy and store it in the heat storage tank. At night, the heat storage tank uses the heat energy stored during the day to meet the heat required by the heat exchange system. When the weather is bad during the day, the heat storage tank relies on the air source heat pump to obtain enough heat energy to support the operation of the heat exchange system. This scheme is suitable for places with more sunny weather.

[0035] like Figure 2The second scheme shown is a resistance wire heat exchange system 10. The air exchanges heat with the resistance wire to increase the air temperature. The resistance wire is connected to a power source to provide energy for the heat exchange system. This scheme is suitable for places where the power supply is relatively sufficient. Through the heat exchange system, a high-temperature gas is formed, and its dew point temperature is higher than the soil temperature, thereby generating condensed water on the inner wall of the buried pipe, effectively reducing the indoor humidity. The condensed water then circulates into the solar greenhouse through the fan to achieve a continuous dehumidification effect. At the same time, by heating the air, the indoor air temperature is increased, which not only plays a role in regulating the hot and humid environment in the solar greenhouse, but also increases the absolute humidity in the greenhouse, and also solves the problem of excessive relative humidity from the root aspect.

[0036] A typical implementation method of the utility model is:

[0037] Step 1: Place the dehumidification device, including the buried pipe 5, the fan system 4 and the heat exchange system, as well as the temperature and humidity sensors 1, the surface temperature sensor 2 and the humidity sensor 3 at different locations.

[0038] Step 2: Through observation and calculation, when the indoor temperature and humidity sensor 1 detects that the humidity in the solar greenhouse is high, the indoor dew point temperature at this time is calculated and compared with the data measured by the surface temperature sensor 2 of the buried pipe.

[0039] Step 3: When the indoor dew point temperature is much higher than the temperature of the buried pipe 5, only the fan system 4 is turned on to perform the dehumidification operation. When the indoor dew point temperature is not much different from the temperature of the buried pipe 5, or even lower than the temperature of the buried pipe 5, the fan system 4 and the heat exchange system are turned on at the same time to perform the dehumidification operation.

[0040] Step 4: Record and calculate the temperature and relative humidity of the indoor temperature and humidity sensor 1. When the relative humidity of the indoor air reaches a reasonable range, turn off the dehumidification system.

[0041] Step 5: Record and calculate the temperature and relative humidity of the indoor temperature and humidity sensor 1. If the humidity in the solar greenhouse is found to be too high, repeat the above operation.

[0042] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A buried pipe dehumidification system for a solar greenhouse, characterized in that: The invention comprises a buried pipe (5) arranged transversely underground, the buried pipe being arranged obliquely from the upper left to the lower right, the left end of the buried pipe being connected to an air inlet pipe, the right end of the buried pipe being connected to an air outlet pipe, the upper end of the air inlet pipe and the upper end of the air outlet pipe being both located above the ground, the upper end of the air outlet pipe being provided with a fan system (4), and a drainage pipe (6) being provided below the right end of the buried pipe.

2. The underground pipe dehumidification system for a solar greenhouse according to claim 1, characterized in that: A surface temperature sensor (2) is arranged in the buried pipe.

3. The underground pipe dehumidification system for a solar greenhouse according to claim 1, characterized in that: A humidity sensor (3) is arranged in the air outlet pipe.

4. The underground pipe dehumidification system for a solar greenhouse according to claim 3, characterized in that: The humidity sensor (3) is located below the fan system (4).

5. The underground pipe dehumidification system for a solar greenhouse according to claim 1, characterized in that: A temperature and humidity sensor (1) is arranged in the solar greenhouse.

6. The underground pipe dehumidification system for a solar greenhouse according to claim 1, characterized in that: A heat exchange system is arranged at the air inlet pipe.

7. The underground pipe dehumidification system for a solar greenhouse according to claim 6, characterized in that: The heat exchange system is an air-water heat exchange system (7), and the air-water heat exchange system is connected to a heat storage tank (9) via a water supply and return pipe (8).

8. The underground pipe dehumidification system for a solar greenhouse according to claim 6, characterized in that: The heat exchange system is a resistance wire heat exchange system (10).

9. The underground pipe dehumidification system for a solar greenhouse according to claim 1, characterized in that: The underground pipe dehumidification system for a solar greenhouse further comprises a controller, wherein the controller is in communication with the fan system (4), the surface temperature sensor (2), the humidity sensor (3) and the temperature and humidity sensor (1).

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