Climate is the heart of greenhouse growing, directly determining crop growth, yield quality and profitability. The core planting advantage of greenhouse is to artificially create a controlled and stable growing environment to get rid of the disadvantages of open-air planting subject to natural weather constraints, but the enclosed or semi-enclosed structural characteristics of the greenhouse climate control has also become a major difficulty in planting management. Stable, suitable temperature and humidity, airflow environment, can guarantee the normal operation of crop photosynthesis, respiration, reduce the growth of stress, help crop production and excellent yield; on the contrary, the climate imbalance will directly trigger crop growth obstruction, disease and pest outbreaks, yield plummeted and a series of problems, a serious impact on greenhouse planting of economic benefits.
In the traditional greenhouse planting mode, growers generally face four major environmental problems, always difficult to completely solve. The first is the greenhouse overheating problem, closed greenhouse is very easy to hoard solar heat, daytime temperatures rapidly soaring, beyond the appropriate growth zone of the crop; followed by excessive humidity, soil evaporation and crop transpiration produced by water vapor can not be discharged in a timely manner, long-term stagnation in the shed; then the air circulation is poor, the air stagnant in the shed, the formation of a locally confined environment; and finally, the temperature fluctuations are drastic, the difference in temperature between day and night, Lastly, the temperature fluctuation is drastic, the temperature difference between day and night, and the temperature difference between sunny and cloudy weather changes abruptly, so that the crop is continuously in a state of growth stress. These four major problems are superimposed on each other, becoming the key bottleneck restricting greenhouse planting to improve quality and efficiency.
With the intensive and refined development of modern agriculture, greenhouse automation control has become a mainstream trend in the industry. The traditional artificial ventilation mode relies on human guards, and requires growers to repeatedly open and close windows daily according to weather changes, which is not only time-consuming and labor-intensive, but also has great lag and subjectivity. Sudden changes in weather, human negligence, and untimely guarding can lead to failure of greenhouse climate control, resulting in crop damage. In this context, without human intervention, automatic adaptation to environmental changes in the temperature-controlled ventilation opener, gradually replacing the traditional manual ventilation system, become a standardized configuration of various types of greenhouse.
This article will comprehensively explain the working principle of temperature-controlled ventilation opener, the value of greenhouse climate control, crop cultivation gain, selection criteria and installation and operation and maintenance skills, to help growers understand the full range of this highly efficient, energy-saving greenhouse climate control equipment, accurate application in all types of planting scenarios.
Greenhouse climate is a comprehensive reflection of all kinds of environmental factors in the shed, directly dominate the whole process of crop growth, the core control elements include five dimensions, one is indispensable. Temperature is the basic conditions for crop growth, each crop has its own appropriate growth temperature range, too high or too low will inhibit growth; humidity directly affects crop transpiration and the probability of pests and diseases; air circulation determines the uniformity of the environment in the shed and the efficiency of the gas exchange; carbon dioxide is the core raw material for crop photosynthesis, the concentration of stable in order to protect the photosynthetic efficiency; the intensity of light to control the rate of accumulation of nutrients in the crop, the five elements work in synergy to determine the crop’s nutrient accumulation rate. The five elements work together to determine the effectiveness of greenhouse cultivation.
A stable greenhouse climate is a prerequisite for healthy crop growth. From the point of view of growth performance, a constant environment allows crop roots, stems and leaves, flowers and fruits to grow in an orderly manner, avoiding sudden changes in the environment to avoid the emergence of ungrowth, stalemate seedlings, flowers and fruits, and other problems. From the perspective of disease prevention and control, stable temperature, humidity and airflow can greatly reduce the breeding environment of mold, fungi and other pathogenic bacteria, and reduce the probability of pest outbreaks. From the level of planting income, a stable growing environment can guarantee the uniform growth rhythm of crops, uniform maturity, and greatly improve the quality and commerciality of fruits and flowers, realizing the double enhancement of yield and quality.
Greenhouse overheating is the most common planting problems, the causes are mainly divided into 3 points: First, solar radiation continues to enter the greenhouse through the film, the heat is absorbed by the soil in the shed, the crop is difficult to dissipate; Second, the closed structure of the greenhouse blocked the internal and external air convection, the heat is very easy to hoard; Third, in spring and summer and other high-temperature seasons, the natural air temperature soars, which further exacerbates the rate of warming in the shed.
The harm caused by overheating is very destructive, high temperature will directly trigger crop heat stress, resulting in crop stomata closed, transpiration disorders, significantly reducing the efficiency of photosynthesis, crop nutrient accumulation is insufficient. Long-term high-temperature environment will cause leaf scorching, bud shedding, fruit deformity, and in severe cases directly lead to plant withering and death, resulting in large-scale yield loss.
The problem of high humidity in greenhouses mainly stems from poor ventilation and continuous water vapor evaporation. Greenhouse soil irrigation water continues to evaporate, crop transpiration continues to release water vapor, if the ventilation system can not replace air in a timely manner, water vapor will remain in the shed for a long time, resulting in relative humidity exceeds the standard.
High-humidity environment is a greenhouse pests and diseases “hotbed”, excessive water vapor will form condensation on the surface of the film, leaves, it is very easy to induce powdery mildew, downy mildew, gray mold, mildew rot and other types of fungal diseases. At the same time, the high humidity environment will weaken the respiratory function of crop leaves, resulting in weak crop growth, a substantial decline in resistance, further aggravating the risk of pest infestation.
Inadequate ventilation will directly lead to stagnant air in the shed, triggering multiple planting problems. First of all, it will cause uneven temperature distribution in the shed, appearing local high temperature hot spots and low-temperature dead zones, crop growth is uneven; secondly, it will affect the spread of crop pollen, reduce the success rate of pollination, leading to a decline in the rate of fruiting, and increase the number of deformed fruits; lastly, the air of the stagnant air will be closed for aphids, whiteflies and other pests to provide a suitable environment for survival, enhance the probability of pest outbreaks, and increase the cost of planting prevention and control.
Chenlong Hardware is a fully automatic and self-adaptive greenhouse window opener without electricity, which belongs to the passive intelligent ventilation system. The core definition of the device is a self-regulating device that automatically adjusts the opening and closing of greenhouse ventilation openings according to the temperature change, which can completely replace the manual ventilation operation by human beings. The equipment is highly adaptable, widely used in greenhouse roof windows, side windows, cold shed, home gardening greenhouse, small and medium-sized planting sheds and large commercial greenhouse and other facilities, adaptable to most of the greenhouse ventilation structure.
The core operation of the temperature controlled ventilation opener relies on the physical principle of thermal expansion and contraction of the wax cylinder, which is simple in structure, stable in operation and has a very low failure rate. The equipment has built-in special temperature control wax body with precise temperature sensing characteristics, realizing automation and non-intervention operation in the whole process.
Window opening process: when the temperature inside the greenhouse rises gradually and reaches the preset starting temperature of the equipment, the wax body inside the wax cylinder expands by heat and produces a stable thrust to push the piston to extend, which drives the ventilation window to open slowly and automatically, realizing the rapid discharge of hot air inside the greenhouse and the inflow of fresh air from the outside. The higher the temperature, the greater the expansion of the wax body, the greater the opening angle of the ventilation window, the ventilation efficiency is increased, which can be accurately adapted to the ventilation needs of different warming amplitudes.
Cooling down and closing the window process: when the temperature in the shed falls down, the temperature of the wax cylinder decreases synchronously, the wax body shrinks gradually, the piston retracts and resets, and the ventilation window closes slowly, avoiding low temperatures at night and a large amount of cold air entering the shed, ensuring the temperature in the shed is stable, and preventing the crops from suffering from cold damage.
The biggest core advantage of this equipment is that the whole process does not need electric power drive, pure physical induction operation, with energy saving, low maintenance, high reliability, regardless of the remote greenhouse without power supply, or regular operation of commercial greenhouses, can be used stably, not subject to power outages, circuit failures.
Temperature-controlled ventilation opener can respond instantly to temperature changes in the shed, realizing overheating that is ventilation, constant temperature and stable environment. Compared with the lag of artificial ventilation, the equipment can sense the temperature fluctuation in real time around the clock, and quickly open the window to dissipate the heat during the daytime when the temperature of the greenhouse rises, reduce the accumulation of heat in a timely manner, to avoid a sudden rise in the greenhouse temperature, and always maintain the temperature of the greenhouse in the appropriate zone for the growth of crops.
This function is especially critical for heat-sensitive crops, tomatoes, cucumbers, lettuce, herbs, all kinds of ornamental flowers and other crops, the temperature fluctuations are extremely sensitive to a slight high-temperature stress will affect the growth and yield. Temperature control ventilation opener can avoid high temperature damage, protect sensitive crops normal growth, significantly reduce the high temperature caused by yield reduction, quality decline.
The equipment can realize the continuous replacement of air in the shed, breaking the air stagnation of the closed environment. Normalized fresh air exchange can enhance the oxygen content in the shed, optimize the crop root respiration and leaf photosynthesis efficiency, to avoid the formation of localized stuffy and humid environment. At the same time, continuous ventilation can eliminate high-temperature hot spots and low-temperature dead zones in the shed, so that the whole shed temperature, gas distribution is uniform.
Uniform and stable airflow and temperature environment, can make the whole piece of greenhouse crop growth rhythm is unified, neat growth, to eliminate the problem of uneven growth, for large-scale standardized planting to lay the foundation.
The temperature control ventilation opener realizes precise humidity control through dynamic ventilation, discharges excess water vapor in the shed in time, and avoids condensation accumulation and moisture retention. During the daytime heating and ventilation process, the hot and humid air is quickly discharged, and the dry fresh air continues to flow in, which can effectively balance the humidity in the shed and solve the problem of high humidity and waterlogging from the root.
Precise control of humidity can significantly reduce the probability of high greenhouse disease, powdery mildew, downy mildew, gray mold and other typical high humidity-induced disease prevention and control effect is significant, reduce the frequency of pesticide use, reduce the cost of planting, while enhancing the quality of green crop planting.
Artificial ventilation is difficult to accurately control the timing of opening and closing, which is very likely to cause the temperature of the shed to fluctuate, so that the crop is in a long-term state of stress, inhibiting growth and development. Temperature-controlled ventilation opener can sense the temperature change in a small range, dynamically adjust the opening and closing angle of the vent, minimize the range of temperature fluctuations in the shed, and achieve a constant temperature and stable environment.
Stable growth environment can completely alleviate crop growth stress, to ensure that crops continue to grow steadily, without the influence of day and night, sunny and cloudy weather changes. Whether it is a small family gardening greenhouse, or commercial scale planting greenhouse, can rely on the equipment to achieve uninterrupted production in all seasons, to enhance the greenhouse land utilization and planting capacity.
Appropriate and stable temperature and humidity and ventilation environment can maximize the activation of crop photosynthesis efficiency and promote nutrient synthesis and accumulation. Adequate ventilation can guarantee the continuous supply of carbon dioxide, appropriate temperature can avoid damage to the photosynthetic system, balanced humidity can maintain the normal operation of crop physiology and metabolism, multiple advantages superimposed to help the crop root system, stem and leaf flourish.
For vegetables, fruits and melons, ornamental flowers and other economic crops, a high-quality growing environment can significantly optimize fruit expansion, bud differentiation, flower color and appearance, effectively improving crop yields and commercial value, and bringing higher economic returns for growers.
There are many unavoidable shortcomings in the traditional manual ventilation mode. Firstly, the labor cost is high, time-consuming and laborious, the grower needs to be on fixed duty every morning and evening, adjusting the vent repeatedly according to the weather, and the daily management workload is large. Secondly, there is a great error and lag in manual operation. Sudden changes in weather, negligence of personnel, and absence from work will lead to untimely ventilation adjustment.
Ventilation lag is very likely to cause serious planting problems, sudden high temperatures can not open the window in time, will cause crop heat burns, growth decline; night cooling is not timely close the window, will lead to a sudden drop in the shed temperature, triggering cold damage, frostbite, while humidity rises induced diseases, the whole process can not guarantee the stability of the greenhouse environment.
Compared with artificial ventilation, temperature-controlled ventilation opener can realize all-weather uninterrupted climate control, without the need for manual daily operation, independent adaptation to temperature changes to adjust the ventilation state, environmental regulation and control is more accurate and stable. The whole automated operation of the equipment completely avoids manual errors and lagging problems, and realizes standardized and refined climate management. At the same time, the equipment can significantly reduce the cost of greenhouse manpower guarding, reduce planting manpower input, and improve planting management efficiency.
Temperature-controlled ventilation opener relies on natural ventilation to regulate the environment in the shed, which can replace electric power cooling and dehumidification equipment such as fans and water curtains, and significantly reduce greenhouse power consumption. The use of solar heating and natural air convection to achieve passive climate control, without continuous energy consumption, long-term use can significantly reduce the greenhouse operating costs, energy saving cost-effective.
After the installation of the equipment, there is no need for human intervention, fully automatic operation, suitable for busy growers, remote greenhouses without power supply and other scenarios. Whether in daily care or unattended state, the ventilation control can be completed stably, which greatly improves the convenience of greenhouse planting and frees manpower.
High-quality temperature-controlled ventilation opener is made of aluminum alloy, stainless steel, weather-resistant and anticorrosive materials, and the core components are UV-resistant, corrosion-resistant, and resistant to high and low temperatures, which can adapt to the complex environment of high humidity and high temperature of the greenhouse for a long period of time, and is not easy to be aged, deformed and damaged. Equipment structure is simple, no complex circuit and mechanical structure, the probability of failure is extremely low, daily only need simple inspection and maintenance, the service life can be up to several years, long-term use of cost-effective and outstanding.
Small greenhouse for home gardening
For small greenhouses and horticultural sheds of family planting enthusiasts, the equipment is simple to install, cost-effective, and can realize automated ventilation without professional operation, solving the problem of insufficient time for family planting duty and unprofessional ventilation control, and adapting to the scenes of family vegetables, flower nursery, potted plant planting, and so on.
Vegetable large-scale planting greenhouse
Widely adapted to tomatoes, peppers, cucumbers, fruits and leafy vegetables and other mainstream vegetable planting greenhouses, can accurately match the temperature and humidity needs of vegetable growth, to avoid high temperature and high humidity triggered by the reduction of production and disease, to ensure that the vegetable growth is uniform and the yield is stable.
Flower and seedling cultivation greenhouse
Flowers and seedlings require high stability of the growing environment, and slight fluctuations in the environment will affect the blooming quality and survival rate of seedlings. The temperature-controlled ventilation opener can stabilize the environment in the greenhouse, optimize the conditions for flower bud differentiation, reduce disease infestation, and improve the quality of flowers and the survival rate of seedlings.
Specialized for hydroponic planting system
Hydroponic cultivation requires strict greenhouse climate consistency, and excessive fluctuations in temperature and humidity can affect the temperature of the water body, dissolved oxygen and the growth of crop roots. The equipment can maintain a stable environment, suitable for hydroponic lettuce, hydroponic flowers and other refined planting modes, to ensure the efficient operation of the hydroponic system.
First of all, we need to match the scale of greenhouse, small family greenhouse is suitable for light ventilation opener, medium-sized planting shed choose conventional model, large commercial greenhouse needs to be matched with a number of equipment ventilation, to ensure that the ventilation volume is sufficient. Secondly, we need to check the load capacity of the window, the mainstream equipment load is divided into 7kg, 15kg, 30kg or more three specifications, heavy glass skylight, large size ventilation window need to choose a large load capacity model, to avoid insufficient thrust equipment can not open the window normally.
At the same time need to pay attention to temperature control parameters, focus on confirming the equipment to start the window opening temperature, the maximum opening stroke, combined with the local climate characteristics of the selection of equipment to adapt to the temperature control interval, to ensure that the equipment accurately adapt to the local temperature changes in the four seasons. Finally, we prioritize the use of anticorrosion, UV resistance, waterproof and weather-resistant material equipment to adapt to the long-term complexity of the greenhouse planting environment, to extend the service life.
Installation location is preferred to the greenhouse roof window, ridge window, side window and other ventilation core points, maximizing the use of air convection principle, and enhancing the ventilation and air exchange efficiency. Adequate ventilation area should be reserved according to the overall space of the greenhouse, so as to avoid incomplete ventilation due to insufficient vents. During the installation process, ensure that the equipment is firmly fixed and smoothly driven, with no jamming or blocking problems.
Growers need to carry out regular quarterly inspections, focusing on checking the integrity of the wax cylinder, the firmness of the mounting bracket, the flexibility of the transmission components, and clean up dust and debris in a timely manner to avoid equipment jamming and failure. At the same time, avoid four common misunderstandings: mismatch of load bearing, insufficient number of equipment, blocking of ventilation paths, and long term neglect of maintenance, so as to eliminate the ventilation failure caused by improper installation, operation and maintenance.
A: The whole process does not need electricity and wiring, it runs on the physical principle of thermal expansion and contraction of the wax body, purely passive ventilation, energy saving and safety.
A: The temperature control range of mainstream equipment is 16℃-30℃, which is suitable for most of the crops, and different models can fine-tune the temperature control parameters.
A: Fully adaptable, can be installed in combination with multiple devices to meet the large-scale, standardized ventilation control needs of large-scale commercial greenhouses.
A: Conventional load-bearing 7kg, 15kg, heavy-duty models up to 30kg or more, can be adapted to various sizes of ventilation windows.
A: Cost-effective, can significantly reduce labor costs, reduce disease losses, improve crop yield and quality, short-term investment, long-term benefits.
A: High-quality products can be used stably for several years under normal maintenance, with strong weather resistance and extremely low failure rate.
Modern greenhouse climate control is upgrading towards intelligence, energy saving and precision. The future temperature control ventilation opener will be deeply integrated with intelligent sensors, Internet of Things remote monitoring system to realize temperature, humidity, light multi-data linkage control, support remote monitoring and intelligent regulation. At the same time, the hybrid ventilation system has become the mainstream of development, combining automatic temperature-controlled ventilation, exhaust fans, intelligent climate control software to realize the synergistic operation of passive ventilation and active ventilation.
The popularization of passive temperature-controlled ventilation equipment will also promote the development of greenhouse green sustainable planting, relying on natural energy to achieve climate control, reduce fossil energy and power consumption, and help modern agriculture energy-saving, green upgrading.
For all greenhouse growers, temperature-controlled ventilation opener is a set of simple and efficient, energy-saving and durable, cost-effective climate control solutions, whether it is home gardening planting or commercial scale planting, is to optimize the greenhouse growing environment, to achieve stable yield and quality, reduce costs and increase efficiency of quality investment, can help greenhouses to achieve year-round stability, standardization, green planting production.
