Greenhouse ventilation - types and specifications

Every gardener knows that in the greenhouse it is necessary to create the right conditions for plants to grow. In this case, ventilation plays one of the main roles, otherwise the cultures may die from an excess of moisture in the air. At the same time, intensive home-made ventilation in the greenhouse can also negatively affect their development.

Our task is to teach you how to use it correctly in order to get the maximum yield.

Why do you need it

One of the negative factors that can destroy all crops in a greenhouse in a short time is the greenhouse effect. In such an atmosphere, many fungal diseases, as well as an unlimited number of pathogenic microflora in the soil, quickly begin to develop (also read the article The ventilating valve for plastic windows is a guarantee of a healthy microclimate in the house).

It is possible to protect against this only by timely airing the greenhouses, reducing the temperature and humidity of the air masses inside the building. In addition, you deliver fresh air to the plants, which is very necessary for their growth. Below you will understand how to properly make the ventilation in the greenhouse and not worry about the microclimate in the building.

The easiest way

Most often at the summer cottage gardeners use the manual method of ventilation of greenhouses and small greenhouses. To do this, open the vents, doors, or even lift the film from the sides.

It is possible to determine the optimal time using the instruments - a hygrometer and a thermometer, which must be installed in the building. Using their readings, you will know when to cover or open the transom, creating natural ventilation in the greenhouse.

By adjusting the number and area of ​​openings with your own hands, you will be able to sufficiently effectively ventilate the structure, taking into account the wind direction and the outside air temperature. The advantage of this method is simplicity and low cost - the devices can not be acquired, but rely on their experience as a gardener. Negative - you can not leave the site for a long time, otherwise the plants will simply die.

We use automatic airing

Over the long term greenhouse cultivation, many gardeners have developed and effectively used simple devices, thanks to which it is possible to translate natural ventilation into an automatic mode.

He is good because:

• manages to create the necessary conditions for plant growth;
• airing can be carried out depending on the culture grown in the greenhouse;
• you do not have to constantly monitor the system.

Today there are 4 ways to automate the ventilation of greenhouses:

• electric;
• hydraulic;
• bimetallic;
• automated vents.

Electrical equipment

The simplest automatic device for the device in the greenhouse of natural exhaust ventilation is the use of a thermal relay to which the fan is connected.

The system works like this:

• the temperature relay is activated when the air in the building exceeds the set temperature;
• the exhaust fan is turned on, which creates a small vacuum and begins to bring out the heated air, which will immediately be replaced by fresh air that passes through the leakages of the greenhouse.

Tip: the efficiency of the system can be increased if at the opposite end of the structure a window automatically opens when the fan is turned on.

Benefits:

• fan operation will quickly reduce the humidity and temperature in the greenhouse;
• the design allows you to accurately set the limits of switching on and off the equipment.

Lack of system:

• electricity dependency;
• difficult installation of drives.

Alternative energy sources such as a wind generator or solar panels will not save from electrical dependence. Their price is quite high, besides, the equipment requires certain conditions for operation, which are not always possible to create.

Hydraulic equipment

The invention can be called ingenious, since here a simple method of communicating vessels is used - the first one needs to be put in the greenhouse and connected to a system of levers, the second one outside, connecting it to the first hose.

The work is done as follows:

• when the temperature in the greenhouse rises, it begins to act on the liquid inside the vessel placed in the structure;
• expanding, it is due to a system of levers opens the window;
• at the same time, the vessel located outside the greenhouse compensates for the pressure, slowing the abrupt opening of the transom;
• when the temperature decreases, everything happens in reverse order.

Consider the pros and cons:

Tip: when choosing a hydraulic opener, note that each has its own specific opening angle.

By this method, automatic vents have been developed, where the fluid is engine oil.

Use of bimetallic devices

In this case, you will learn how to make ventilation in the greenhouse yourself, using a device that does not require you to have special knowledge and skills, as well as large financial costs. The mechanism consists of two bimetallic plates with a different coefficient of expansion and a lever.

The work takes place in this order — when the temperature rises to a certain limit, one of the plates begins to bend, pushing the lever to open the vent. After lowering the temperature, it returns to its original position and closes it.

The disadvantage of the system is a complex calculation of the compliance of plate bending for a certain temperature.

Conclusion

In an artificially created climate, everything must be provided in advance, including ventilation. Thanks to it, you can control the humidity in the building and the temperature, which will favorably affect the crop yield. Today you learned about the two main types of ventilation and now you can choose the most suitable for you (see also the article Ventilation from galvanized steel is a universal solution).

The video in this article will help you find additional information on this topic.