Spraying System Optimization for Excessive Temperature and Humidity Problems in Vinyl Greenhouses

Vinyl greenhouses, also commonly known as “nylon greenhouses,” are widely preferred in Turkey due to their low initial investment costs. However, these greenhouses, especially due to the characteristics of the plastic cover, pose serious challenges in terms of climate control. On a sunny day, the internal temperature can quickly rise to dangerous levels (heat stress), and since the humidity formed by plant transpiration cannot be expelled, excessive humidity problems (fungus and powdery mildew) arise. This climate dilemma leads directly to yield loss and a decrease in product quality.

Traditional solutions are generally ventilation or simple timer-based spraying systems. However, the practical and effective solution lies in optimizing these systems. To overcome excessive temperature and humidity problems, “spraying (fogging)” and “air movement (circulation)” systems must work in synchronization with smart automation. At this point, esular‘s smart climate control solutions come into play.

The Climate Dilemma in Vinyl Greenhouses: High Humidity and Temperature

Vinyl (plastic) covers, unlike glass, trap more heat inside and do not “breathe”. This situation leads to two fundamental problems:

1. Overheating (Heat Stress): In sunny weather, the greenhouse temperature can quickly rise 10-15°C above the outside environment. Plants get stressed above 30°C, photosynthesis slows down, and flower drop begins.
2. Excessive Humidity: Water vapor resulting from plant transpiration (transpiration) cannot escape through the plastic cover. The humidity trapped inside rises above 90% levels, creating an ideal environment for fungal diseases (powdery mildew, botrytis).

It is difficult to solve these two problems at the same time. For example, although ventilation alone may lower the temperature somewhat, it does not lower the internal humidity if the outside air is also humid. Using spraying only for cooling purposes can worsen the situation by increasing humidity even further.

Solution 1: Smart Cooling with Spraying (Fogging) Systems

One of the most effective methods to solve the temperature problem is spraying, namely fogging systems. Micro water droplets sprayed at high pressure evaporate by absorbing heat from the air and cool the environment.

However, the critical error here is this: Running the fogging with a simple timer. If you fog when the air is already humid, you turn the greenhouse into a “sauna” environment. This can be fatal for plants.

h3 class="wp-block-heading">Optimization: Data-Driven Fogging

The practical and correct solution is to optimize the fogging system according to humidity and temperature data. Esular’s smart automation system does exactly this:

• Esular Wireless Temperature and Humidity Sensors are placed inside the greenhouse.
• The system monitors both the temperature and relative humidity in the air instantaneously.
• The central control unit (Gateway) operates according to the smart scenarios you define:

Smart Scenario Example:
“IF the internal greenhouse temperature rises above 30°C AND the internal greenhouse humidity is below 70%, THEN run the fogging system (spraying) for 5 minutes.”

“IF the internal greenhouse humidity rises above 85%, STOP the fogging regardless of the temperature.”

This optimization prevents the greenhouse from overheating while not allowing humidity to rise to dangerous levels.

Solution 2: Humidity Control with Air Movement (Circulation)

The second critical element in temperature and humidity optimization is providing “air movement”. Stagnant air creates a humid micro-climate around plant leaves, inviting diseases. Air movement is provided by two methods: Circulation Fans and Ventilation (Window Control).

• Circulation Fans: They move the air inside the greenhouse, ensuring a homogeneous distribution of temperature and humidity. By drying the surface of plant leaves, they prevent fungal spores from settling.
• Ventilation (Window Automation): Used to exchange the hot and humid air inside with cooler and drier air from outside.

Optimization: Synchronization of Fans and Windows

Esular Smart Greenhouse Window Control Panel and automation scenarios make these two systems communicate with each other:

1. If Humidity is High: The system checks data coming from the external climate station. If the outside air is drier than inside, it opens the windows automatically.
2. Synchronized Operation: The moment the windows open, circulation fans activate to ensure the rapid discharge of humid air inside through the windows.
3. Safety: If the wind speed outside is high or if it has started to rain, the system automatically closes the windows to protect the greenhouse.

Combining Two Systems with Esular: Optimum Climate Control

The most practical way to solve the temperature and humidity problem in vinyl greenhouses is to intelligently combine fogging and air movement.

Esular ecosystem provides this optimization as follows:

1. Monitor (Sensors): Wireless Humidity, Temperature, and CO2 sensors track the conditions inside the greenhouse instantaneously.
2. Decide (Central Unit): E Series or F Series central control unit (Gateway) analyzes the data it collects and makes decisions according to defined scenarios.
3. Implement (Actuators):
   • If temperature is high and humidity is low, the Fogging (Spraying) system activates.
   • If humidity is high, Circulation Fans and Window Automation activate.

This integrated approach transforms your vinyl greenhouse into an efficient and healthy production area.

Conclusion: Less Disease, More Yield

Excessive temperature and humidity problems frequently encountered in plastic (vinyl) greenhouses are not destiny. These problems can be easily overcome by using practical data-driven automation solutions instead of simple timers.

Thanks to esular‘s wireless sensors and smart climate control systems:

• Ideal temperature and humidity balance is maintained.
• Heat stress in plants is eliminated.
• Excessive humidity leading to diseases such as fungus and powdery mildew is prevented.
• Since fans and fogging systems run only when necessary, energy savings of up to 40% are achieved.
• With healthy plant development, yield increases of up to 40% are obtained.
• Labor costs decrease thanks to the automated system.

Contact the Esular expert team to transform your vinyl greenhouse into a smart production facility and optimize your climate problems with practical solutions.

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